among the formula ( i ) compounds a first group of preferred compounds consists in compounds in which r is an aryl , possibly substituted with one or more halogen atoms , alkyl , alkoxy or haloalkyl , preferably methyl , methoxy or trifluoromethyl , nitro , mono - o di - alkylamine . within the context of this first group , preferably p is 1 , n is 0 , 1 or 2 , and q is oxygen . a second group of preferred compounds consists of compounds in which r is a heteroaryl , preferably containing nitrogen as heteroatom , e . g . indole and carbazole , bound to the rest of the molecule via all the positions allowed ; particularly preferred among these are the 1 - indolyl and 1 - carbazolyl . within the context of this second group . preferably p is 1 , n is 0 , 1 or 2 , and q is oxygen . particularly preferred are the following compounds prepared according to the general methods and synthesis procedures described here below , which illustrate , but in no way limit the applicability of the invention : i . methyl 2 -[ 3 -[ 2 -( 4 - chlorophenyl ) ethoxy ] phenylthio ] isobutyrate ( st2195 ); ii . 2 -[ 3 -[ 2 -( 4 - chlorophenyl ) ethoxy ] phenylthio ]- 2 - methylpropanoic acid ( st2518 ); iii . methyl 2 -[ 4 -[ 2 -( 4 - chlorophenyl ) ethoxy ] phenylthio ] isobutyrate ( st1929 ); iv . methyl 2 -[ 3 -( 2 -( 2 , 4 - dichlorophenyl ) ethoxy ) phenylthio ] isobutyrate ( st2534 ); v . methyl 2 -[ 4 -( 2 -( 2 , 4 - dichlorophenyl ) ethoxy ) phenylthio ] isobutyrate ( st2531 ); vi . methyl 2 -[ 3 -( 2 -( carbazol - 9 - yl ) ethoxy ) phenylthio ] isobutyrate ( st2365 ); vii . methyl 2 -[ 4 -( 2 -( carbazol - 9 - yl ) ethoxy ) phenylthio ] isobutyrate ( st2387 ); viii . methyl 2 -[ 4 -[ 2 -( 1 - indolyl ) ethoxy ] phenylthio ] isobutyrate ( st1983 ); ix . methyl 2 -[ 3 -[ 2 -( 1 - indolyl ) ethoxy ] phenylthio ] isobutyrate ( st2394 ); x . methyl 2 -[ 3 -[ 2 -( 2 - naphthyl ) ethoxy ] phenylthio ] iso - butyrate ( st2167 ); xi . methyl 2 -[ 4 -[ 2 -( 2 - naphthyl ) ethoxy ] phenylthio ] isobutyrate ( st2011 ). xii . 2 -[ 4 -[ 2 -( 4 - chlorophenyl ) ethoxy ] phenylthio ]- 2 - methylpropanoic acid ( st2505 ); xiii . 2 -[ 3 -( 2 -( 2 , 4 - dichlorophenyl ) ethoxy ) phenylthio ]- 2 - methylpropanoic acid ( st2653 ); xiv . 2 -[ 4 -( 2 -( 2 , 4 - dichlorophenyl ) ethoxy ) phenylthio ]- 2 - methylpropanoic acid ( st2652 ); xv . 2 -[ 3 -( 2 -( carbazol - 9 - yl ) ethoxy ) phenylthio ]- 2 - methyl propanoic acid ( st2618 ); xvi . 2 -[ 4 -[ 2 -( 1 - indolyl ) ethoxy ] phenylthio ]- 2 - methyl propanoic acid ( st2622 ): xvii . 2 -[ 3 -[ 2 -( 1 - indolyl ) ethoxy ] phenyltho ]- 2 - methyl propanoic acid ( st2651 ); xviii . 2 -[ 3 -[ 2 -( 2 - naphthyl ) ethoxy ] phenylthio ]- 2 - methyl - propanoic acid ( st2609 ); xix . 2 -[ 4 -[ 2 -( 2 - naphthyl ) ethoxy ] phenylthio ]- 2 - methylpropanoic acid ( st2036 ); xx . methyl 2 -[ 4 -[ 2 -( 1 -( 5 - methoxy ) indolil ) ethoxy ] phenylthio ] isobutyrate ( st2577 ); xxi . methyl 2 -[ 4 -[ 2 -( 1 -( 5 - benziloxy ) indolil ) etoxy ] phenylthio ] isobutyrate ( st2562 ); xxii . methyl 2 -[ 3 -[ 5 -( 4 - nitrophenyl ) furfuryloxy ] phenylthio ] isobutyrate ( st2501 ); xxii . 2 -[ 4 -[ 2 -( 1 -( 5 - methoxy ) indolil ) ethoxy ] phenylthio ] isobutiric acid ( st2733 ); xxiv . 2 -[ 4 -[ 2 -( 1 -( 5 - benzyloxy ) indolil ) ethoxy ] phenylthio ]- 2 - methylpropanoic acid ( st2740 ); xxv . 2 - methyl - 2 -[ 3 -[ 5 -( 4 - nitrophenyl ) furfuryloxy ] phenylthio ] proparioic acid ( st2753 ). the formula ( i ) compounds are prepared using the reactions described in general methods a - c . the following diagrams illustrate the methods used for the synthesis of the formula ( i ) compounds . unless otherwise specified , the meaning of the various symbols coincides with that given in general formula ( i ). the hydrolysis procedure described in method a can also be applied to the other methods . the preparation of compounds with general formula ( i ) was done by reacting the general formula ii compound with a base , preferably inorganic , and preferably sodium hydride , to form the corresponding anion which was then reacted with a general formula iii compound containing an exit group , such as chlorine , bromine , iodine , mesyl , tosyl and diazo ( in the case of the diazo group , instead of an inorganic base a bivalent rhodium acetate dimer is used as catalyst ), e . g . 2 - methyl - alpha - bromoisobutyrate , in a polar solvent such as acetonitrile , toluene , or preferably dimethylformamide , for a time period ranging from 18 to 48 hours at a temperature ranging from 10 to 50 ° c ., preferably 25 ° c . the product thus obtained was subjected to basic or acid hydrolysis , using , for example , naoh , or , for example , a mixture of hcl / acetic acid , at a temperature ranging from 10 to 100 ° c ., preferably 25 ° c ., for a time period ranging from 1 to 72 hours , preferably 3 hours , to give the corresponding acid i a . the preparation of general formula ( i ) compounds was done starting from compounds of general structure iv , which were reacted with an alcohol of general structure v in the classic mitsunobu reaction conditions , as described in synthesis 1981 , 1 - 28 , using anhydrous and aprotic solvents such as benzene , toluene , ether or preferably tetrahydrofuran , for a time period ranging from 30 minutes to 72 hours , preferably 48 hours , at a temperature ranging from 10 to 40 ° c ., preferable 25 ° c . the compounds prepared with this method were obtained starting from vi dissolved in aprotic solvents , for example toluene , ether , benzene , preferably tetrahydrofuran , then added with the related isocyanate , thioisocyanate or chloroformiate vii , possibly in the presence of an inorganic or organic base , preferably triethylamine in a catalytic or stoichiometric amount and leaving it to react for a time period ranging from 6 to 72 hours , preferably 48 hours at temperatures ranging from 10 to 40 ° c ., preferably 25 ° c . in the case in which k is equal to cooh condensing agents such as diethylphosphorocyanidate , eedq , dcc or cdi and the like were used in a ratio of 1 : 3 equivalents to the substrates , preferably 1 : 1 . 5 equivalents , or the process passed through the formation of the acid chloride , conducting the condensation reaction in organic solvents such as dmf , ch 3 cn , chcl 3 , thf and the like , at a temperature ranging from 20 to 80 ° c ., preferably 25 ° c ., with a reaction time ranging from 18 hours to 3 days , preferably 24 hours . the following examples further illustrate the invention , though by no means exclusively : the product was prepared starting from 3 - mercaptophenol ( 2 . 00 g , 15 . 9 mmol ) in 40 ml of anyhdrous ch 3 cn , nah 80 % ( 0 . 572 g 19 . 1 mmol ) at 0 ° c . after 5 minutes , methyl - 2 - bromoisobutyrate ( 2 . 88 g , 15 . 9 mmol ) was added to the suspension . the reaction mixture thus obtained was left overnight under magnetic stirring at room temperature . after this period the mixture was poured into h 2 o and extracted with ethyl acetate . the organic phase was dried on anhydrous sodium sulphate and evaporated to dryness . the residue obtained was purified by silica gel chromatography using chcl 3 / ch 3 oh 98 / 2 as eluent . 2 . 900 g of product were obtained ( yield : 81 %); mp ( melting point ): 41 . 5 - 42 . 5 ° c . ; tlc : silica gel , eluent chcl 3 / ch 3 oh 98 / 2 , fr ( frontal ratio ): 0 . 23 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 19 ( t , 1h ), 7 . 00 ( d , 1h ), 6 . 95 ( brt , 1h ), 6 . 81 ( dd , 1h ), 3 . 69 ( s , 3h ), 1 . 50 ( s , 6h ); hplc : column : inertisil ods — 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 50 / 50 ( v / v ), ph : as is , flow rate : 0 . 75 ml / min , 205 nm uv detector , retention time 13 . 82 min ; kf : 0 . 3 % h 2 o ; e . a . conforming for c 11 h 14 o 3 s . the product was prepared starting from methyl 2 -( 3 - hydroxyphenylthio ) isobutyrate ( prepared as described above ) ( 1 . 00 g , 4 . 42 mmol ), and 4 - chlorophenetyl alcohol ( 0 . 692 g , 4 . 42 mmol ) in 15 ml of anhydrous thf , to which were added diad ( 1 . 16 g , 5 . 75 mmol ) and triphenylphosphine ( 1 . 500 g , 5 . 75 mmol ) piecemeal in small portions , keeping the temperature below 30 ° c . the reaction was left overnight under magnetic stirring at room temperature . after this time period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 9 / 1 as eluent . 1 . 146 g of oily product were obtained ( yield : 71 %); tlc : silica gel , eluent hexane / acoet 9 / 1 , fr = 0 . 28 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 25 ( m , 6h ), 7 . 00 ( m , 1h ), 6 . 90 ( d , 1h ), 4 . 15 ( t , 2h ), 3 . 65 ( s , 3h ), 3 . 08 ( t , 2h ), 1 . 55 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : 30 ° c ., mobile phase ch 3 cn / h 2 o 80 / 20 ( v / v ), ph : as is , flow rate : 0 . 75 ml / min , 205 nm uv detector , retention time 19 . 34 min ; kf : 1 . 7 % h 2 o ; e . a . conforming for c 19 h 21 clo 3 s . the product was prepared starting from a solution of st2195 ( prepared as described in example 1 ) ( 0 . 150 g , 0 . 41 mmol ) in 9 ml of methanol to which were added 4 ml of naoh 1n . the solution thus obtained was left for 48 hours at room temperature under magnetic stirring . after this time period , the solution was diluted with water , acidified with hcl 1n and the aqueous phase extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent was evaporated in vacuo . 0 . 128 g of product were obtained ( yield : 88 %); mp : 105 - 106 ° c . ; tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 4 / 0 . 6 , fr : 0 . 42 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 45 ( m , 5h ), 7 . 10 ( m , 2h ), 6 . 80 ( dd , 1h ), 4 . 15 ( t , 2h ), 3 . 05 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : symmetry — c 18 ( 5 μm ) 4 . 6 × 250 mm , t : 30 ° c ., mobile phase ch 3 cn / ammonium acetate 10 mm 35 / 65 ( v / v ), ph : as is , flow rate : 0 . 80 ml / min , 205 nm uv detector , retention time 4 . 66 min ; e . a . conforming for c 18 h 19 clo 3 s . the title product was prepared according to the procedure described in method a ( step 1 ) starting from 4 - mercaptophenol ( 0 . 500 g , 4 . 0 mmol ) in 10 ml of anhydrous ch 3 cn , to which was added nah 80 % ( 0 . 144 g , 4 . 8 mmol ). the mixture was cooled to 0 ° c . and after 5 minutes methyl - α - bromoisobutyrate ( 0 . 724 g , 4 . 0 mmol ) was added . the reaction was left for two days at room temperature under magnetic stirring . after this period , the mixture was poured into h 2 o and extracted with ethyl acetate ; the aqueous phase was then acidified with hcl 1n and extracted again with ethyl acetate . the pooled organic phases were dried on na 2 so 4 , filtered and evaporated . the residue obtained was purified by silica gel chromatography using chcl 3 as eluent . 0 . 760 g of product were obtained ( yield : 84 %); mp : 110 - 112 ° c . ; tlc : silica gel , eluent chcl 3 , fr : 0 . 11 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 30 ( d , 2h ), 6 . 73 ( d , 2h ), 5 . 57 ( brm , 1h ), 3 . 70 ( s , 3h ), 1 . 45 ( s , 6h ); hplc : column : symmetry — c 18 , ( 5 μm ) 4 . 6 × 250 mm , t : 30 ° c ., mobile phase ch 3 cn / h 2 o 50 / 50 ( v / v ), ph : as is , flow rate : 0 . 75 ml / min , 205 nm uv detector , retention time 10 . 14 min ; e . a . ( elemental analysis ) conforming for c 11 h 14 o 3 s . the title product was prepared according to the procedure described in method b starting from methyl 2 -( 4 - hydroxyphenylthio ) isobutyrate ( prepared as described above ) ( 0 . 800 g , 3 . 54 mmol ) and 4 - chlorophenetyl alcohol ( 0 . 554 g , 3 . 54 mmol ) in 20 ml of anhydrous thf . dead ( 0 . 801 g , 4 . 6 mmol ) and triphenylphosphine ( 1 . 205 g , 4 . 6 mmol ) were added piecemeal in small portions , maintaining the temperature below 30 ° c . the reaction was left overnight under magnetic stirring at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / ethyl acetate 9 / 1 as eluent . 0 . 416 g of oily product were obtained ( yield : 32 %); tlc : silica gel , eluent hexane / ethyl acetate 9 / 1 , fr : 0 . 32 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 40 - 7 . 19 ( m , 6h ), 6 . 80 ( d , 2h ), 4 . 15 ( t , 2h ), 3 . 65 ( s , 3h ), 3 . 08 ( t , 2h ) 1 . 45 ( s , 6h ); hplc : column : symmetry — c 18 , ( 5 μm ) 4 . 6 × 250 mm , t : 30 ° c ., mobile phase ch 3 cn / h 2 o 70 / 30 ( v / v ), ph : as is , flow rate : 0 . 75 ml / min , 205 nm uv detector , retention time 31 . 40 min ; kf : 0 . 4 % h 2 o ; e . a . conforming for c 19 h 21 clo 3 s . the title product was prepared according to the procedure described in method b starting from methyl 2 -( 3 - hydroxyphenylthio ) iso - butyrate ( prepared as described in example 1 ) ( 0 . 280 g , 1 . 24 mmol ) and diad ( 0 . 325 g , 1 . 61 mmol ) dissolved in 3 ml of anhydrous thf and added dropwise to a solution of 2 , 4 - dichlorophenetylalcohol ( 0 . 260 g , 1 . 36 mmol ), and triphenylphosphine ( 0 . 422 g , 1 . 61 mmol ) in 4 ml of anhydrous thf at 0 ° c . the reaction was left overnight under magnetic stirring at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 9 . 6 / 0 . 4 as eluent . 0 . 327 g of oily product were obtained ( yield : 66 %); tlc : silica gel , eluent hexane / acoet 9 / 1 , fr : 0 . 34 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 40 ( d , 1h ), 7 . 20 ( m , 3h ), 7 . 00 ( m , 2h ), 6 . 90 ( dd , 1h ), 4 . 15 ( t , 2h ), 3 . 65 ( s , 3h ), 3 . 20 ( t , 2h ), 1 . 45 ( s , 6h ); hplc : column : inertisil ods — 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 90 / 10 ( v / v ), ph : as is , flow rate : 0 . 8 ml / min , 205 nm uv detector , retention time 12 . 40 min ; kf : 0 . 2 % h 2 o ; e . a . conforming for c 19 h 20 cl 2 o 3 s . the title product was prepared according to the procedure described in method b starting from methyl 2 -( 4 - hydroxyphenylthio ) iso - butyrate ( prepared as described in example 3 ) ( 0 . 280 g , 1 . 24 mmol ) and diad ( 0 . 325 g , 1 . 61 mmol ) dissolved in 3 ml of anhydrous thf and added dropwise to a solution of 2 , 4 - dichlorophenetylalcohol ( 0 . 260 g , 1 . 36 mmol ) and triphenylphosphine ( 0 . 422 g , 1 . 61 mmol ) in 4 ml of anhydrous thf at 0 ° c . the reaction was left overnight under magnetic stirring at room temperature after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 9 . 6 / 0 . 4 as eluent . 0 . 346 g of product were obtained ( yield : 70 %); mp : 73 - 74 ° c . ; tlc : silica gel , eluent hexane / acoet 9 / 1 , fr : 0 . 26 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 35 ( m , 3h ), 7 . 22 ( m , 2h ), 6 . 83 ( d , 2h ), 4 . 18 ( t , 2h ), 3 . 65 ( s , 3h ), 3 . 20 ( t , 2h ), 1 . 45 ( s , 6h ); hplc : column : inertisil ods — 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / h 2 o . 85 / 15 ( v / v ), ph : as is , flow rate : 1 ml / min , 205 nm uv detector , retention time 12 . 58 min ; kf : 0 . 4 % h 2 o ; e . a . conforming for c 19 h 20 cl 2 o 3 s . the title product was prepared according to the procedure described in method b starting from methyl 2 -( 3 - hydroxyphenylthio ) iso - butyrate ( prepared as described in example 1 ) ( 0 . 609 g , 2 . 7 mmol ), 9h - carbazol - 9 - ethanol ( 0 . 570 g , 2 . 7 mmol ), diad ( 0 . 708 g , 3 . 5 mmol ), and triphenylphosphine ( 0 . 917 g , 3 . 5 mmol ) added piecemeal in small portions , keeping the temperature below 30 ° c ., in 14 ml of anhydrous thf . the reaction was left under magnetic stirring for 18 hours at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 9 / 1 as eluent . 0 . 510 g of product were obtained ( yield : 45 %); mp : 101 - 103 ° c . ; tlc : silica gel , eluent hexane / acoet 8 / 2 , fr : 0 . 38 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 8 . 05 ( d , 2h ), 7 . 50 ( m , 4h ), 7 . 15 ( m , 2h ), 7 . 08 ( t , 1h ), 7 . 00 ( d , 1h ), 6 . 90 ( s , 1h ), 6 . 80 ( m , 1h ), 4 . 75 ( t , 2h ), 4 . 35 ( t , 2h ), 3 . 60 ( s , 3h ), 1 . 40 ( s , 6h ); hplc : column : symmetry — c 18 , ( 5 μm ) 4 . 6 × 150 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 65 / 35 ( v / v ), ph : as is , flow rate : 0 . 80 ml / min , 205 nm uv detector , retention time 11 . 45 min ; e . a . conforming for c 25 h 25 no 3 s . the product was prepared according to the procedure described in method b starting from methyl 2 -( 4 - hydroxyphenylthio ) isobutyrate ( prepared as described in example 3 ) ( 0 . 609 g , 2 . 7 mmol ), 9h - carbazol - 9 - ethanol ( 0 . 570 g , 2 . 7 mmol ), diad ( 0 . 708 g , 3 . 5 mmol ), and triphenylphosphine ( 0 . 917 g , 3 . 5 mmol ) added piecemeal in small portions , keeping the temperature below 30 ° c ., in 14 ml of anhydrous thf . the reaction was left under magnetic stirring for 18 hours at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 9 / 1 as eluent . 0 . 702 g of product were obtained ( yield : 62 %); mp : 72 - 74 ° c . ; tlc : silica gel , eluent hexane / acoet 8 / 2 , fr : 0 . 30 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 8 . 05 ( d , 2h ), 7 . 50 ( m , 4h ), 7 . 15 ( m , 4h ), 6 . 75 ( d , 2h ), 4 . 75 ( t , 2h ), 4 . 35 ( t , 2h ), 3 . 60 ( s , 3h ), 1 . 40 ( s , 6h ); hplc : column : symmetry — c 18 , ( 5 μm ) 4 . 6 × 150 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 70 / 30 ( v / v ), ph : as is , flow rate : 0 . 80 ml / min , 205 nm uv detector , retention time 11 . 60 min ; e . a . conforming for c 25 h 25 no 3 s . the intermediate product , reported in j . med . chem ., 1998 , 41 / 10 , 1619 - 1639 , was prepared according to the procedure described therein , with the exception of the duration of the reaction time ( equal to 30 hours instead of 30 minutes ), starting from indole ( 5 . 0 g , 42 . 7 mmol ), koh ( 3 . 6 g , 64 . 1 mmol ) and bromoethanol ( 6 . 4 g , 51 . 3 mmol ) in 50 ml of anhydrous dmso , at a temperature of 25 - 30 ° c ., to obtain 5 g of oily product ( yield : 73 %). the product was prepared according to the procedure described in method b starting from methyl 2 -( 4 - hydroxyphenylthio ) isobutyrate ( prepared as described in example 3 ) ( 0 . 671 g , 2 . 97 mmol ), 1 -( 2 - hydroxyethyl ) indole ( 0 . 478 g , 2 . 97 mmol ), dead ( 0 . 672 g , 3 . 86 mmol ), and triphenylphosphine ( 1 . 011 g , 3 . 86 mmol ) added piecemeal in small portions , keeping the temperature below 30 ° c ., in 15 ml of anhydrous thf . the reaction was left under magnetic stirring for 48 hours at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / ethyl acetate 8 / 2 as eluent . in all , 0 . 500 g of still impure product were obtained which was dissolved in ethyl acetate and washed with a solution of naoh 1n . the organic phase was dried and evaporated to give a residue of 0 . 230 g which was purified again by silica gel chromatography , eluting with chcl 3 . 0 . 184 g of oily product were obtained ( yield : 17 %); tlc : silica gel , eluent hexane / ethyl acetate 8 / 2 , fr : 0 . 29 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 62 ( d , 1h ), 7 . 40 - 7 . 10 ( m , 6h ), 6 . 78 ( d , 2h ), 6 . 50 ( d , 1h ), 4 . 50 ( m , 2h ), 4 . 24 ( m , 2h ), 3 . 61 ( s , 3h ), 1 . 40 ( s , 6h ); hplc : column : symmetry — c 18 , ( 3 . 5 μm ) 4 . 6 × 75 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 60 / 40 ( v / v ), ph : as is , flow rate : 0 . 90 ml / min , 205 nm uv detector , retention time 10 . 70 min ; kf : 1 . 7 % h 2 o ; e . a . conforming for c 21 h 23 no 3 s . the title product was prepared according the procedure described in method b starting from methyl 2 -( 3 - hydroxyphenylthio ) isobutyrate ( prepared as described in example 1 ) ( 1 . 00 g , 4 . 42 mmol ), and 1 -( 2 - hydroxyethyl ) indole ( prepared as described in example 8 ) ( 0 . 71 μg , 4 . 42 mmol ) in 20 ml of anhydrous thf , to which were added diad ( 1 . 16 g , 5 . 75 mmol ) and triphenylphosphine ( 1 . 500 g , 5 . 75 mmol ) piecemeal in small portions , keeping the temperature below 30 ° c . the reaction was left overnight under magnetic stirring at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 8 / 2 as eluent . 0 . 581 g of oily product were obtained ( yield : 35 %); tlc : silica gel , eluent hexane / acoet 9 / 1 , fr : 0 . 22 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 62 ( d , 1h ), 7 . 42 ( d , 1h ), 7 . 30 - 6 . 80 ( in , 7h ), 6 . 52 ( d , 1h ), 4 . 55 ( m , 2h ), 4 . 30 ( m , 2h ), 3 . 61 ( s , 3h ), 1 . 50 ( s , 6h ); hplc : column : supelco — c 18 ( 5 μm ) 4 . 6 × 150 mm , t : 30 ° c ., mobile phase ch 3 cn / h 2 o 70 / 30 ( v / v ), ph : as is , flow rate : 0 . 90 ml / min , 205 nm uv detector , retention time 6 . 36 min ; e . a . conforming for c 21 h 23 no 3 s . the product was prepared according to the procedure described in method b ( with the exception of dead which was replaced by diad ) starting from methyl 2 -( 3 - hydroxyphenylthio ) isobutyrate ( prepared as described in example 1 ) ( 1 . 110 g , 4 . 9 mmol ), 2 -( 2 - naphthyl ) ethanol ( 0 . 842 g , 4 . 9 mmol ), diad ( 1 . 290 g , 6 . 37 mmol ), and triphenylphosphine ( 1 . 670 g , 6 . 37 mmol ) in 20 ml of anhydrous thf . the reaction was left overnight under magnetic stirring at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 7 / 3 as eluent . the product was further purified by dissolving it in ethyl acetate and washing the organic phase with a solution of na 2 co 3 . the organic phase was dried on sodium sulphate and the solvent evaporated in vacuo . 1 . 14 g of product were obtained ( yield : 61 . 2 %); tlc : silica gel , eluent hexane / acoet 9 / 1 , fr : 0 . 20 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 80 ( m , 3h ), 7 . 75 ( s , 1h ), 7 . 45 ( m , 3h ), 7 . 25 ( t , 1h ), 7 . 05 ( m , 2h ), 6 . 90 ( d , 1h ), 4 . 25 ( t , 2h ), 3 . 65 ( s , 3h ), 3 . 30 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : inertisil ods — 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 80 / 20 ( v / v ), ph : as is , flow rate : 0 . 9 ml / min , 205 nm uv detector , retention time 18 . 91 min ; kf 1 . 0 % h 2 o ; e . a . conforming for c 23 h 24 o 3 s . the product was prepared according to the procedure described in method b starting from methyl 2 -( 4 - hydroxyphenylthio ) isobutyrate ( prepared as described in example 3 ) ( 1 . 000 g , 4 . 42 mmol ), 2 -( 2 - naphthyl ) ethanol ( 0 . 760 g , 4 . 42 mmol ), dead ( 1 . 000 g , 5 . 75 mmol ) and triphenylphosphine ( 1 . 500 g , 5 . 75 mmol ) added piecemeal in small portions , maintaining the temperature below 30 ° c ., in 30 ml of anhydrous thf . the reaction was left overnight under magnetic stirring at room temperature . after this period , the solvent was evaporated and the residue purified by silica gel chromatography using hexane / acoet 9 / 1 as eluent . 1 . 262 g of product ( yield : 75 %); mp : 56 - 57 ° c . ; tlc : silica gel , eluent hexane / acoet 9 / 1 , fr : 0 . 23 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ 7 . 85 - 7 . 70 ( m , 4h ), 7 . 45 - 7 . 28 ( m , 5h ), 6 . 83 ( d , 2h ), 4 . 27 ( t , 2h ), 3 . 65 ( s , 3h ), 3 . 26 ( t , 2h ), 1 . 45 ( s , 6h ); hplc : column : inertisil ods — 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / h 2 o 80 / 20 ( v / v ), ph : as is , flow rate : 0 . 75 ml / min , 205 nm uv detector , retention time 23 . 51 min ; kf : 0 . 16 % h 2 o ; e . a . conforming for c 23 h 24 o 3 s . the product was prepared starting from a solution of st1929 ( prepared as described in example 3 ) ( 0 . 572 g , 1 . 57 mmol ) in 36 ml of methanol to which were added 15 . 7 ml of naoh 1n . the solution obtained was left overnight under magnetic stirring at reflux temperature . after this period , the solution was acidified with hcl 1n and the aqueous phase extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . the product was purified by chromatography on a silica gel column , eluting with hexane / acoet 7 : 3 . 0 . 448 g of product were obtained ( yield : 81 . 5 %); mp : 87 - 88 ° c . ; tlc : silica gel , eluent hexane / acoet 6 / 4 , fr : 0 . 3 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 40 ( d , 2h ), 7 . 25 ( d , 2h ), 7 . 20 ( d , 2h ), 6 . 80 ( d , 2h ), 4 . 15 ( t , 2h ), 3 . 05 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : symmetry — c 18 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / ammonium acetate 10 mm 45 / 55 ( v / v ), ph : as is , flow rate : 0 . 70 ml / min , 205 nm uv detector , retention time 4 . 73 min ; e . a . conforming for c 18 h 19 clo 3 s . the product was prepared starting from a solution of st2534 ( prepared as described in example 4 ) ( 0 . 700 g , 1 . 75 mmol ) in 11 ml of ch 3 oh to which were added 21 ml of naoh 1n . the solution obtained was left under magnetic stirring for two days at 40 ° c . after this period , the ch 3 oh was evaporated in vacuo and the aqueous phase was acidified with hcl 1n and extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . 0 . 486 g of product were obtained ( yield : 72 %); mp : 86 - 88 ° c . ; tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 6 / 0 . 4 , fr : 0 . 18 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 40 ( s , 1h ), 7 . 20 ( m , 3h ), 7 . 05 ( m , 2h ), 6 . 90 ( d , 1h ), 4 . 15 ( t , 2h ), 3 . 05 ( t , 2h ), 1 . 45 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 70 / 30 ( v / v ), ph : appr . 3 ( h 3 po 4 ), flow rate : 1 ml / min , 205 nm uv detector , retention time 16 . 78 min ; e . a . conforming for c 18 h 18 c 2 o 3 s . the product was prepared starting from a solution of st2531 ( prepared as described in example 5 ) ( 0 . 130 g , 0 . 32 mmol ) in 3 ml of tetrahydrofuran , to which were added 3 ml of an aqueous solution of lioh ( 0 . 040 g , 1 . 67 mmol ). the suspension obtained was left overnight under magnetic stirring at room temperature . after this period , the tetrahydrofuran was evaporated in vacuo and the aqueous phase acidified with hcl 1n and extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . the residue obtained was purified on a silica gel chromatography column , eluting with chcl 3 / ch 3 oh 9 . 6 / 0 . 4 . 0 . 044 g of product were obtained ( yield : 36 %); tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 6 / 0 . 4 , fr : 0 . 20 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 40 ( m , 3h ), 7 . 20 ( m , 2h ), 6 . 80 ( d , 2h ), 4 . 15 ( t , 2h ), 3 . 15 ( t , 2h ), 1 . 45 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 65 / 35 ( v / v ), ph : appr . 3 ( h 3 po 4 ), flow rate : 1 ml / min , 205 nm uv detector , retention time 27 . 20 min ; e . a . conforming for c 18 h 18 cl 2 o 3 s . the product was prepared starting from a solution of st2365 ( prepared as described in example 6 ) ( 0 . 120 g , 0 . 286 mmol ) in 3 ml of tetrahydrofuran , to which was added 1 ml of an aqueous solution of lioh ( 0 . 014 g , 0 . 5 mmol ). the suspension thus obtained was left overnight under magnetic stirring at room temperature . after this period , the tetrahydrofuran was evaporated in vacuo and the aqueous phase acidified with hcl 1n and extracted on anhydrous na 2 so 4 and filtered , and the solvent was evaporated in vacuo . 0 . 042 g of product were obtained ( yield : 36 %); tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 6 / 0 . 4 , fr : 0 . 24 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 8 . 05 ( d , 2h ), 7 . 50 ( m , 4h ), 7 . 10 - 7 . 00 ( m , 5h ), 6 . 80 ( d , 1h ), 4 . 70 ( t , 2h ), 4 . 30 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 70 / 30 ( v / v ), ph : as is , flow rate : 1 ml / min , 205 nm uv detector , retention time 11 . 92 min ; e . a . conforming for c 24 h 23 no 3 s . the product was prepared starting from a solution of st1983 ( prepared as described in example 8 ) ( 1 g , 2 . 71 mmol ) in 15 ml of ch 3 oh to which were added 30 ml of naoh 1n . the solution obtained was left under magnetic stirring for 48 hours at 40 ° c . after this period , the ch 3 oh was evaporated in vacuo and the aqueous phase acidified with hcl 1n and extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . the residue obtained was purified on a silica gel chromatography column , eluting with chcl 3 / ch 3 oh 9 . 6 / 0 . 4 . 0 . 679 g of product were obtained ( yield : 70 %); tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 6 / 0 . 4 , fr : 0 . 27 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 60 ( d , 1h ), 7 . 40 ( d , 3h ), 7 . 20 ( m , 3h ), 6 . 80 ( d , 2h ), 6 . 50 ( d , 1h ), 4 . 50 ( t , 2h ), 4 . 25 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : inertisili ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 70 / 30 ( v / v ), ph : as is , flow rate : 1 ml / min , 205 nm uv detector , retention time 8 . 30 min ; e . a . conforming for c 20 h 21 no 3 s . the product was prepared starting from a solution of st2394 ( prepared as described in example 9 ) ( 0 . 140 g , 0 . 38 mmol ) in 3 ml of tetrahydrofuran to which were added 2 ml of an aqueous solution of lioh ( 0 . 040 g , 1 . 67 mmol ). the suspension obtained was left overnight under magnetic stirring at room temperature . after this period the tetrahydrofuran was evaporated in vacuo and the aqueous phase acidified with hcl 1n and extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . the residue obtained was purified on a silica gel chromatography column , eluting with chcl 3 / ch 3 oh 9 . 6 / 0 . 4 0 . 086 g of product were obtained ( yield : 63 %); tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 6 / 0 . 4 , fr : 0 . 19 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 60 ( d , 1h ), 7 . 40 ( d , 1h ), 7 . 20 - 7 . 00 ( m , 6h ), 6 . 80 ( d , 1h ), 6 . 50 ( d , 1h ), 4 . 50 ( t , 2h ), 4 . 20 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 65 / 35 ( v / v ), ph : as is , flow rate : 1 ml / min , 205 nm uv detector , retention time 8 . 77 min ; e . a . conforming for c 20 h 21 no 3 s . the product was prepared starting from a solution of st2167 ( prepared as described in example 10 ) ( 0 . 270 g , 0 . 71 mmol ) in 18 ml of ch 3 oh to which were added 15 ml of naoh 2n . the solution obtained was left for 48 hours under magnetic stirring at reflux temperature . after this period , the reaction mixture was cooled , acidified with hcl 1n and extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . the residue obtained was purified on a silica gel chromatography column , eluting with hexane / acoet 7 / 3 . 0 . 030 g of product were obtained ( yield : 14 %); tlc : silica gel , eluent hexane / acoet 6 / 4 , fr : 0 . 24 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 80 ( m , 3h ), 7 . 70 ( s , 1h ), 7 . 40 ( m , 3h ), 7 . 20 ( m , 1h ), 7 . 10 ( s , 2h ), 6 . 90 ( d , 1h ), 4 . 20 ( t , 2h ), 3 . 20 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 an ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 70 / 30 ( v / v ), ph : as is , flow rate : 1 ml / min , 205 nm uv detector , retention time 11 . 77 min ; e . a . conforming for c 22 h 22 o 3 s . the product was , prepared starting from a solution of st2011 ( prepared as described in example 11 ) ( 0 . 498 g , 1 . 29 mmol ) in 30 ml of ch 3 oh to which were added 12 . 9 ml di naoh 1n . the solution obtained was left overnight under magnetic stirring at reflux temperature . after this time , the reaction mixture was cooled , acidified with hcl 1n and extracted with acoet . the organic phase was dried on anhydrous na 2 so 4 and filtered and the solvent evaporated in vacuo . 0 . 450 g of product were obtained ( yield : 95 %); mp : 103 - 104 ° c . ; tlc : silica gel , eluent chcl 3 / ch 3 oh 9 . 8 / 0 . 2 , fr : 0 . 13 ; 1 h nmr ( cdcl 3 , 300 mhz ) δ : 7 . 80 ( m , 3h ), 7 . 70 ( s , 1h ), 7 . 40 ( m , 5h ), 6 . 80 ( d , 2h ), 4 . 20 ( t , 2h ), 3 . 20 ( t , 2h ), 1 . 50 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , t : room temperature , mobile phase ch 3 cn / kh 2 po 4 50 mm 75 / 25 ( v / v ), ph : as is , flow rate : 0 . 75 ml / min , 205 nm uv detector , retention time 13 . 10 min ; e . a . conforming for c 22 h 22 o 3 s . to a solution of st1923 ( prepared as described in example 3 ) ( 0 . 2 g , 0 . 88 mmoles ) in anhydrous thf ( 6 ml ), were added 2 -( 5 - methoxy - indol - 1 - yl )- ethanol ( prepared as described in example 8 starting from 5 - methoxy indole and 2 - bromo - ethanol ) ( 0 . 185 g , 0 . 97 mmoles ), diad ( 0 . 230 g , 1 . 14 mmoles ) and , triphenyl phosphine ( 0 . 299 g , 1 . 14 mmoles ) in small portion . the reaction mixture was left overnight under magnetic stirring at room temperature , then the solvent was removed under vacuum and the residue was dissolved in acoet and washed with naoh 1n . the organic phase was dried on na 2 so 4 filtered and evaporated . the residue obtained was purified by silica gel chromatography using as eluent exane / acoet 87 / 13 to give 0 . 180 g of final product ( yield 51 %). tlc : silica gel , eluent : exane / acoet 7 / 3 , fr : 0 . 39 ; 1 h nmr ( 300 mhz , cdcl 3 ) δ 7 . 30 ( m , 3h ), 7 . 15 ( d , 1h ), 7 . 10 ( d , 1h ), 6 . 90 ( dd , 1h ), 6 . 78 ( d , 2h ), 6 . 40 ( d , 1h ), 4 . 50 ( t , 2h ), 4 . 25 ( t , 2h ), 3 . 85 ( s , 3h ), 3 . 65 ( s , 3h ), 1 . 40 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , r . t ., mobile phase ch 3 cn / h 2 o 85 / 15 v / v , ph as it is , flow rate 0 . 75 ml / min , 205 nm uv detector , retention time 7 . 80 min ; a . e . : conforms to expected for c 22 h 25 no 4 s . to a solution of st1923 ( prepared as described in example 3 ) ( 0 . 2 g , 0 . 88 mmoles ) in anhydrous thf ( 6 ml ), were added 2 -( 5 - benzyloxy - indol - 1 - yl ) ethanol ( prepared as described in example 8 starting from 5 - benzyloxy indole and 2 - bromo - ethanol ) ( 0 . 26 g , 0 . 97 mmoles ), diad ( 0 . 230 g , 1 . 14 mmoles ) and , triphenyl phosphine ( 0 . 299 g , 1 . 14 mmoles ) in small portion . the reaction mixture was left overnight under magnetic stirring at room temperature , then the solvent was removed under vacuum and the residue was dissolved in acoet and washed with naoh 1n . the organic layer was dried on na 2 so 4 filtered and evaporated under vacuum . the residue obtained was purified by silica gel chromatography using as eluent exane / acoet 85 / 15 to give 0 . 240 g of final product ( yield 57 %). mp : 87 - 88 ° c . ; tlc : silica gel , eluent : exane / acoet 7 / 3 , fr 0 . 41 ; 1 h nmr ( 300 mhz , cdcl 3 ) δ 7 . 45 - 7 . 2 ( m , 10h ), 7 . 00 ( dd , 1h ), 6 . 80 ( d , 2h ), 6 . 40 ( d , 1h ), 5 . 10 ( s , 2h ), 4 . 50 ( t , 2h ), 4 . 25 ( t , 2h ), 3 . 60 ( s , 3h ), 1 . 40 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , r . t ., mobile phase ch 3 cn / h 2 o 90 / 10 v / v , ph as it is , flow rate 0 . 80 ml / min , 205 nm uv detector , retention time 8 . 21 min ; a . e . : conforms to expected for c 28 h 29 no 4 s . to a solution of methyl 2 -( 3 - hydroxy - phenylthio ) isobutyrate ( prepared as described in example 1 ) ( 1 . 02 g , 4 . 5 mmoles ) in anhydrous thf ( 23 ml ), were added 5 - nitrofurfuryl alcohol ( 0 . 986 g , 4 . 5 mmoles ), diad ( 1 . 18 g , 5 . 85 mmoles ) and , triphenyl phosphine ( 1 . 53 g , 5 . 85 mmoles ) in small portion . the reaction mixture was left overnight under magnetic stirring at room temperature , then the solvent was removed under vacuum and the residue was dissolved in acoet and washed with naoh 1n . the organic layer was dried on na 2 so 4 filtered and removed under vacuum . the residue obtained was purified by silica gel chromatography using as eluent exane / acoet 9 . 4 / 0 . 6 to give 0 . 380 g of final product ( yield 20 %). mp : 81 - 82 ° c . ; tlc : silica gel , eluent : exane / acoet 7 / 3 , fr 0 . 45 ; 1 h nmr ( 300 mhz , cdcl 3 ) δ 8 . 22 ( d , 2h ), 7 . 80 ( d , 2h ), 7 . 22 ( m , 2h ), 7 . 10 - 7 . 00 ( m , 3h ), 6 . 80 ( d , 1h ), 6 . 60 ( d , 1h ), 5 . 10 ( s , 2h ), 370 ( s , 3h ), 1 . 50 ( s , 6h ); hplc : column : symmetry c 18 ( 5 μm ) 4 . 6 × 250 mm , r . t ., mobile phase ch 3 cn / h 2 o 85 / 15 v / v , ph as it is , flow rate 0 . 85 ml / min , 205 nm uv detector , retention time 6 . 24 min ; a . e . : conforms to expected for c 22 h 21 no 6 s . to a solution of st2577 ( prepared as described in example 20 ) ( 0 . 2 g , 0 . 50 mmoles ) in ch 3 oh ( 3 . 2 ml ), was added a solution of naoh 1n ( 6 ml ). the reaction mixture was left overnight under magnetic stirring at 40 ° c ., then the organic phase was removed under vacuum and the aqueous phase was extracted with acoet . the aqueous layer was separated and acidified with hcl 1n and then extracted again with acoet . this second organic extract was washed with water dried on na 2 so 4 filtered and evaporated under vacuum to give 0 . 138 g of final product ( yield 72 %). mp : 100 - 102 ° c . ; tlc : silica gel , eluent : chcl 3 / ch 3 oh 8 / 2 , fr : 0 . 62 ; 1 h nmr ( 300 mhz , cdcl 3 ) δ 7 . 40 ( d , 2h ), 7 . 25 ( s , 1h ), 7 . 10 ( d , 2h ), 6 . 90 ( d , 1h ), 6 . 78 ( d , 2h ), 6 . 40 ( d , 1h ), 4 . 50 ( t , 2h ), 4 . 20 ( t , 2h ), 3 . 80 ( s , 3h ), 1 . 40 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , r . t ., mobile phase ch 3 cn / kh 2 po 4 50 mm 70 / 30 , ph as it is , flow rate 1 ml / min , 205 nm uv detector ; retention time 7 . 32 min ; a . e . : conforms to expected for c 21 h 23 no 4 s . to a solution of st2562 ( prepared as described in example 21 ) ( 0 . 430 g , 0 . 90 mmoles ) in ch 3 oh ( 10 ml ), was added a solution of naoh 1n ( 15 ml ). the reaction mixture was left 48 hours under magnetic stirring at 40 ° c ., then the organic phase was removed under vacuum and the aqueous residue was extracted with acoet . the aqueous phase was separated and acidified with hcl 1n and then extracted again with acoet . this second organic extract was washed with water , dried on na 2 so 4 and evaporated under vacuum to give 0 . 310 g of final product ( yield 74 %). mp : 160 - 162 ° c . ; tlc : silica gel , eluent : chcl 3 / ch 3 oh 9 / 1 , fr . : 0 . 57 ; 1 h nmr ( 300 mhz , cdcl 3 ) δ 7 . 40 - 7 . 15 ( m , 10h ), 7 . 20 ( s , 2h ), 7 . 00 ( d , 1h ), 6 . 90 ( d , 2h ), 6 . 40 ( s , 1h ), 5 . 15 ( s , 2h ), 4 . 50 ( t , 2h ), 4 . 20 ( t , 2h ), 1 . 40 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , r . t ., mobile phase : ch 3 cn / kh 2 po 4 50 mm 70 / 30 , ph as it is , flow rate 1 ml / min , 205 nm uv detector , retention time 11 . 60 min ; a . e . conforms to expected for c 27 h 27 no 4 s . to a solution of st2501 ( prepared as described in example 22 ) ( 0 . 4 g , 0 . 93 mmoles ) in ch 3 oh ( 10 ml ), was added a solution of naoh 1n ( 25 ml ). the reaction mixture was left 4 days under magnetic stirring at 40 ° c ., then the organic phase was removed under vacuum and the aqueous residue was extracted with acoet . the aqueous phase was separated and acidified with hcl 1n and then extracted again with acoet . this second organic extract was washed with water , dried on na 2 so 4 and evaporated under vacuum . the residue was purified by silica gel chromatography eluting with chcl 3 / ch 3 oh 9 . 4 / 0 . 6 to give 0 . 215 g of final product ( yield 56 %). mp : 137 - 138 ° c . ; tlc : silica gel , eluent : chcl 3 / ch 3 oh 9 / 1 , fr 0 . 53 ; 1 h nmr ( 300 mhz , dmso ) δ 8 . 30 ( d , 2h ), 8 . 00 ( d , 2h ), 7 . 40 ( m , 2h ), 7 . 10 ( d , 3h ), 6 . 80 ( s , 1h ), 4 . 20 ( s , 2h ), 1 . 40 ( s , 6h ); hplc : column : inertisil ods 3 ( 5 μm ) 4 . 6 × 250 mm , r . t ., mobile phase ch 3 cn / kh 2 po 4 50 mm 70 / 30 , ph as it is , flow rate 1 ml / min , 205 nm uv detector , retention time 11 . 38 min ; a . e . : conforms to expected for c 21 h 19 no 6 s . mutations in laboratory animals have made it possible to develop models presenting non - insulin - dependent diabetes associated with obesity , hyperlipidaemia and insulin resistance and that enable us to test the efficacy of new antidiabetes compounds ( reed and scribner , diabetes , obesity and metabolism 1 : 75 - 86 , 1999 ). a genetically diabetic mouse model widely used is the c57bl / ksj db / db mouse . the genetic basis of this model is a defect in the leptin receptor gene ( db / db mouse ), which causes leptin resistance and leads to overeating , obesity , hyperinsulinaemia and insulin resistance , with subsequent symptoms of insufficient insular secretion and hyperglycaemia ( kodama et al ., diabetologia 37 : 739 - 744 , 1994 ; zhang et al ., nature 372 : 425 - 432 , 1994 ; chen et al ., cell 84 : 491 - 495 , 1996 ). since hyperglycaemia is accompanied by obesity and insulin resistance , the db / db mouse presents characteristics that resemble those of type 2 diabetes in human subjects and is useful for assaying insulin - sensitising compounds . the c57bl / ksj db / db mice used in the experiments were supplied by jackson lab ( via ch . river ). after 10 days &# 39 ; acclimatisation in standard conditions ( 22 ± 2 ° c . ; 55 ± 15 % humidity ; 15 - 20 air changes / hour ; 12 - hour light - darkness cycle with light from 7 a . m . to 7 p . m .) on a standard 4 fr21 diet ( mucedola ), blood samples were taken in postabsorption conditions ( fasting from 8 . 30 a . m . to 4 . 30 p . m .) from the caudal vein with the aid of a jelco 22g catheter ( johnson and johnson ). plasma levels of glucose , insulin , triglycerides , cholesterol , free fatty acids and urea were checked for a well - matched distribution of mice in the treatment groups . at the start of treatment the body weights of the mice were checked and arrangements were made for monitoring water and feed consumption . the mice were treated orally twice daily ( at 8 . 30 a . m . and 6 . 30 p . m .) for 25 days ( experiment i ) or for 12 days ( experiment ii ) with the compounds according to the invention , using as reference compounds rosiglitazone , bezafibrate and fenofibrate ( experiment i ) or the compound as in example 1 ( experiment ii ). the compounds were administered at a dose equivalent to 25 mg / kg of the compound st2195 of example 1 according to the invention , in 10 ml / kg of vehicle ( cmc 1 % containing tween 80 0 . 5 % in deionized h 2 o ). in particular , rosiglitazone was administered at the dose of 5 mg / kg ( lohray et al . j . med chem 41 , 1619 - 1630 , 1998 ), bezafibrate at 24 . 8 mg / kg and fenofibrate at 24 . 7 mg / kg . in the course of the experiment , serum glucose levels , oral glucose tolerance test ( ogtt ) findings , a number of lipid status parameters and weight gain were monitored . the compounds according to the invention proved capable of lowering serum glucose levels in feeding ( table 1 ), postabsorption ( tables 2 , 2a , 5 and 5a ) and fasting conditions ( tables 3 and 3a ). they also proved capable of improving glucose tolerance ( tables 4 and 4a ) and of reducing fructosamine , an index of protein glycosylation ( tabella 5 ) which , as mentioned above , plays an important role in the development of the micro - and macrovascular complications of diabetes . the compounds according to the invention also show a good ability to reduce serum triglyceride levels , similar to that of rosiglitazone and fenofibrate ( tables 6 and 6a ). in addition , unlike rosiglitazone , the compounds according to the invention increased hdl - cholesterol levels ( tables 6 and 6a ) and brought about a lower weight gain than that caused by rosiglitazone and one close to that induced by fibrates ( table 7 and 7a ). an increase in hdl - cholesterol values constitutes an indicator of pparα agonism and of a lower risk of atherosclerosis . pparα agonism , in fact , increases fatty acid oxidation in tissues , reducing the accumulation of intracellular triglycerides , which favour insulin resistance ( virkamäki et al ., diabetes 50 , 2337 - 2343 , 2001 ; mensink et al ., diabetes 50 , 2545 - 2554 , 2001 ; kelley and goodpaster , diabetes care 24 , 933 - 941 , 2001 ). transactivation assays in eukaryotic cells make it possible to quantitatively evaluate the ability of a hypothetical ligand to favour the interaction of a transcriptional factor with its own response element within a promoter [ sladek r . et al ., in : nuclear receptors : a practical approach , oxford press pp . 63 - 68 ( 1999 )]. since the peroxisome proliferator activated receptor α ( pparα ) exerts its transcriptional modulatory function , its dimerisation with the receptor for 9 - cis retinoic acid ( rxr ) is necessary . the dimer formed is capable of binding to the peroxisome proliferator response element ( ppre ), located in the target gene promoter , only if activated by the presence of a ligand of at least one of the two receptors [ berger j . and moller d . e ., annu . rev . med . 53 , 409 - 35 ( 2002 )]. a transactivation assay thus requires the simultaneous presence of the following in the preselected cell line : a ) a sufficient amount of pparα ; b ) a sufficient amount of the 9 cis - retinoic acid receptor ( rxr ); c ) a chimeric plasmid containing the reporter gene controlled by a ppre , located upstream of a viral heterologous promoter . in our case the reporter gene is chloramphenicol - acetyl transferase ( cat ). whenever the endogenous levels of pparα and rxr are insufficient , they can be supplemented from the outside through transfection of expression vectors containing the genes of the receptors concerned [ kersten s . and wahli w . in : nuclear receptors : a practical approach , oxford press pag 74 - 76 ( 1999 )]. the plasmid pch110 contains the gene for β - galactosidase and is co - transfected together with the reporter gene cat , providing the internal control for the efficiency of transfection and the normalisation of the results . using this transfection and reporter gene system , however , it is not possible to completely eliminate interference by endogenous receptors constitutively expressed by the cell line used . an alternative method is therefore used which enables us to get around the problem of interference by possible endogenous receptors . in this model a transactivation assay is used in which the expression vector mpparαlbd / gal4 dbd allows the synthesis by the transfected cell of a chimeric protein , in which the ligand binding domain ( lbd ) of pparα is fused with the dna binding domain ( dbd ) of the transcription factor gal4 of yeast [ luckow b . et al ., nucleic acids res . 15 , 5490 ( 1987 )]. simultaneously , a plasmid ( pg5cat ) is transfected which contains 5 copies of the high - affinity binding site for gal4 ( also called uas , upstream activating sequence ), upstream of the viral promoter e1b fused with the cat reporter gene [ moya - camarena s . y . et al ., j . lipid res . 40 ( 8 ), 1426 - 33 ( 1999 )]. this model eliminates interference by possible endogenous receptors . this is due to the fact that the activation of e1b and the production of cat will occur exclusively thanks to the interaction of gal4 dbd with its own response element ( uas ). since the transcription factor gal4 is not expressed in eukaryotic cells , transactivation of the reporter gene can take place only when , as a result of the interaction of a ligand with the lbd of pparα , the chimeric protein pparα / gal4 recognises the uas sequence on the plasmid pg5cat . together with the expression vector and the reporter vector the cells were also transfected with the plasmid pch110 which provides the internal control for the efficiency of transfection and the normalisation of the results . a monkey kidney fibroblast cell line ( cos - 7 ) was used [ elbrecht a . et al ., j . biol . chem . 274 ( 12 ), 7913 - 22 ( 1999 )]. the cells were co - transfected with the reporter vector , the expression plasmid coding for the fusion protein gal4 dbd / pparαlbd and the control vector pch110 . the cells were exposed to increasing concentrations of the study compounds and cat activity was evaluated . untreated cells were used as controls . monkey kidney fibroblasts ( cos - 7 ) were cultured according to the usual cell culture techniques , at 37 ° c . in a 5 % v / v carbon dioxide atmosphere using as the growth medium dmem ( dulbecco &# 39 ; s modified eagle &# 39 ; s medium ) modified with 3 . 7 g / l of sodium bicarbonate , 4 mm l - glutamine , 4 . 5 g / l of glucose , 1 mm sodium pyruvate and 10 % v / v of foetal bovine serum , in the presence of streptomycin 100 μg / ml and penicillin 100 u / ml final . the cells were co - transfected using the transfection reagent fugene6 ( roche ), consisting of a defined mixture of lipids capable of complexing the dna and of transporting it into the cells . twenty - four hours prior to transfection the cells were plated at a density of 1 . 2 × 10 5 cells / well in 12 - well plates and maintained at 37 ° c . in a 5 % v / v co 2 atmosphere . the culture medium , devoid of serum , was replaced 2 hours before transfection , and then the cells were treated with the transfection reagent fugene6 according to the instructions suggested by the supplier . briefly , the transfection mixture containing 0 . 8 μg of the expression vector , 1 . 6 μg of the reporter vector , 0 . 8 μg of the control vector and 9 μl of the fugene6 reagent per well was added directly to the cells in the presence of culture medium devoid of serum . after 5 hours , the transfection medium was replaced by 1 ml of culture medium complete with serum and antibiotics in the presence or absence of the molecules to be tested at 3 different concentrations ( 2 , 20 and 100 μm ). wy - 14 , 643 ( 2 μm ), a known ligand of pparα , was used as the positive reference compound . after 48 hours &# 39 ; incubation at 37 ° c . in a 5 % v / v co 2 atmosphere , the cells were washed twice with 1 ml of phosphate buffer ( pbs ) and removed mechanically from the wells in ten buffer ( tris [ hydroxymethyl ] aminomethane 10 mm ph 8 , ethylenediamine - tetraacetic acid 1 mm ph 8 , sodium chloride 0 . 1 m ). after centrifuging for 3 minutes at 1000 rpm , the cells were resuspended in 65 μl of lysis buffer ( tris - hcl 0 . 25 m , ph 8 ) and then lysed thanks to three rapid freeze - thaw cycles . the insoluble cellular materials ( debris ) were removed by centrifuging at 15 , 000 rpm for 15 minutes at 4 ° c ., and the supernatant was recovered and used for the cat and β - galactosidase activity assays . the cell extracts were stored at − 80 ° c . until assayed after previously adding glycerol ( final concentration 10 % v / v ) and β - mercaptoethanol ( final 5 mm ) in a final volume of 75 μl . the assay for evaluating cat activity was done by applying a variant of the method described by sleigh [ sleigh m . j . annal biochem ., 156 ( 1 ), 251 - 6 ( 1986 )]. briefly , 20 μl of protein cell extract ( preheated to 65 ° c . for 10 minutes to deactivate the internal deacetylating enzymatic activity ) were added to a solution containing 10 μl of n - butyryl - coenzyme a ( 3 . 5 mg / ml ), 5 μl of [ 14 c ]- chloramphenicol ( 0 . 25 μci ) and 65 μl of distilled h 2 o . after 2 hours &# 39 ; incubation at 37 ° c . the reaction was blocked with 200 μl of a solution of xylene / 2 , 6 , 10 , 14 tetramethyl - pentadecane ( 1 : 2 v / v ). after vigorous stirring and centrifuging for 5 minutes at maximum speed , 150 μl of supernatant were added to 5 ml of scintillation fluid and analysed under the beta - counter ( scintillator ) to determine the [ 14 c ] butyryl - chloramphenicol content formed as a result of the enzymatic reaction . as an internal control for the normalisation of cat activity in relation to the efficiency of transfection , the β - galactosidase activity coded for by the corresponding gene in the co - transfected plasmid pch110 was used . β - galactosidase activity was measured according to a variant of the method described by sambrook [ sambrook et al . in : molecular cloning , a laboratory manual , edited by cold spring harbor laboratory press ( 1989 )]. briefly , 20 μl of protein extracts were added to 750 μl of the reaction buffer containing 1 volume of 2 mg / ml onpg ( o - nitrophenyl - β - d - galactopyranoside ) and 3 volumes of “ z buffer ” ( 10 mm potassium chloride , 1 mm magnesium chloride , 50 mm β - mercaptoethanol in phosphate buffer ). the reaction was run at 37 ° c . and interrupted by adding 200 μl of a sodium carbonate 1 m solution when the appearance of the typical yellow colouring was clearly noticeable . the samples were incubated for 10 minutes at room temperature and then analysed under the spectrophotometer measuring the absorbance at the wavelength of 420 nm ( a 420 ). the following formula was used for the normalisation of the cat assay results with respect to β - galactosidase activity : table 8 presents the pparα agonist activity of the compounds as in examples 1 , 2 , 4 , 10 , 13 and 18 by way of examples . since the peroxisome proliferator activated receptor γ ( pparγ ) exerts its transcriptional modulatory function , its dimerisation with the receptor for 9 - cis retinoic acid is necessary ( rxr ). the dimer formed is capable of binding to the peroxisome proliferator response element ( ppre ), located in the target gene promoter , only if activated by the presence of a ligand of at least one of the two receptors [ berger j . and moller d . e ., annu . rev . med . 53 , 409 - 35 ( 2002 )]. a transactivation assay specific for pparγ thus requires the simultaneous presence of the following in the preselected cell line : a ) a sufficient amount of pparγ ; b ) a sufficient amount of the 9 cis - retinoic acid receptor ( rxr ); c ) a chimeric plasmid containing the reporter gene controlled by a ppre , located upstream of a viral heterologous promoter . in our case the reporter gene is chloramphenicol - acetyl transferase ( cat ). in the transactivation assay used , the preselected cells are transfected with the expression vector psg5 stop - mpparg1 which allows the synthesis of the pparγ receptor by the transfected cell . simultaneously , a plasmid reporter ( pblcat2 - ppre ) is transfected which contains a peroxisome proliferator response element ( ppre ) isolated by the gene promoter for acyl - coa oxidase , upstream of the heterologous promoter of viral thymidine kinase ( tk ) fused with the reporter gene cat . since the endogenous cell levels of the rxr receptor are sufficiently high , it is not necessary to transfect an expression vector specific for rxr as well . the expression of the gene coding for cat is under the control of the tk promoter which does not contain any ppre . therefore , any increase in cat levels will be the result of increased gene transcription dependent upon the dimerisation of pparγ with rxr and upon the heterodimer bond formed with the peroxisome proliferator response element . together with the expression vector and the reporter vector the cells are also transfected with the plasmid pch110 which provides the internal control for the efficiency of transfection and the normalisation of the results a cell line of mouse embryonal fibroblasts ( nih - 3t3 ) was used [ hogan j . c . et al ., biochem biophys res commun . 287 ( 2 ), 484 - 92 ( 2001 )]. the cells were transfected with the reporter plasmid , the expression plasmid coding for the pparγ receptor and the control vector pch110 . the cells were exposed to increasing concentrations of the study compounds and cat activity was evaluated . untreated cells were used as controls . mouse embryonal fibroblasts ( nih - 3t3 ) were cultured according to the usual cell culture techniques , at 37 ° c . in a 5 % v / v carbon dioxide atmosphere using as the growth medium dmem ( dulbecco &# 39 ; s modified eagle &# 39 ; s medium ) modified with 3 . 7 g / l of sodium bicarbonate , 4 mm l - glutamine , 4 . 5 g / l of glucose , 1 mm sodium pyruvate and 10 % v / v of calf serum , in the presence of streptomycin 100 μg / ml and penicillin 100 u / ml final . the cells were co - transfected using the transfection reagent fugene6 ( roche ), already described in the previous example . twenty - four hours prior to transfection the cells were plated at a density of 8 . 0 × 10 4 cells / well in 12 - well plates and maintained at 37 ° c . in a 5 % v / v co 2 atmosphere . the culture medium , devoid of serum , was replaced 2 hours before transfection , and then the cells were treated with the transfection reagent fugene6 , as described in the previous example . after 5 hours , the transfection medium was replaced by 1 ml of culture medium complete with serum and antibiotics in the presence or absence of the molecules to be tested at 3 different concentrations ( 2 , 20 and 100 μm ). rosiglitazone , a known ligand of pparγ , was used as the positive reference compound . the cell protein extracts were prepared and the cat activity assay was conducted exactly as described in the previous example . as an internal control for the normalisation of the cat activity in relation to the transfection efficiency , β - galactosidase activity coded for by the corresponding gene in the co - transfected plasmid pch110 was used . β - galatosidase activity was measured exactly as described in the previous example . for the normalisation of the cat assay results in relation to α - galactosidase activity the formula described in the previous example was used . table 9 presents the pparγ agonist activity of a number of compounds by way of examples . the results obtained , presented in tables 1 - 7a , show that the compounds according to the invention are useful agents for the treatment of diabetes and hyperlipidaemia , for increasing hdl - cholesterol levels , and for preventing and treating the complications relating to diabetes and insulin resistance , for the primary and secondary prevention of chd , and potentially for the therapy of fatty liver . the objects of the present invention are pharmaceutical compositions containing as their active ingredient at least one formula ( i ) compound , either alone or in combination with one or more formula ( i ) compounds , or , said formula ( i ) compound or compounds in combination with other active ingredients useful in the treatment of the diseases indicated in the present invention , for example , other products with serum - glucose - lowering and serum - lipid - lowering activity ; also in separate dosage forms or in forms suitable for combined therapies . the active ingredient according to the present invention will be in a mixture with suitable vehicles and / or excipients commonly used in pharmacy , such as , for instance , those described in “ remington &# 39 ; s pharmaceutical sciences handbook ”, latest edition . the compositions according to the present invention will contain a therapeutically effective amount of the active ingredient . the doses will be decided by the expert in the sector , e . g . the clinician or primary care physician according to the type of disease to be treated and the patient &# 39 ; s condition , or concomitantly with the administration of other active ingredients . by way of an example , dosages ranging from 0 . 01 to 400 mg / day can be indicated , preferably 0 . 1 to 200 mg / day . examples of pharmaceutical compositions are those that allow administration orally or parenterally — intravenous , intramuscular , subcutaneous , transdermal . suitable pharmaceutical compositions for the purpose are tablets , rigid or soft capsules , powders , solutions , suspensions , syrups , and solid forms for extempore liquid preparations . compositions for parenteral administration are , for example , all the forms which are injectable intramuscularly , intravenously , subcutaneously , or in the form of solutions , suspensions or emulsions . liposomal formulations should also be mentioned . other forms are tablets for the controlled release of the active ingredient , or for oral administration , tablets coated with appropriate layers , microencapsulated powders , complexes with cyclodextrins , and depot forms , for example , subcutaneous ones , such as depot injections or implants .
the use is described of derivatives of α - phenylthiocarboxylic and α - phenyloxycarboxylic acids with formula : in which the substituents have the meanings described in the text , for the preparation of a medicine for the prophylaxis and treatment of diabetes , particularly type 2 diabetes , its complications , the various forms of insulin resistance , and hyperlipidaemias