hereinafter , the present invention will be further described in detail in combination with specific embodiments . the examples given are only for illustration , but not for limiting the scope of the present invention . although the alkaline reagent in the examples below is 4 - dimethylaminopyridine , it is understood that agents such as pyridine , 2 - methylpyridine , 3 - methylpyridine , 4 - methylpyridine , 2 - ethylpyridine , 3 - ethylpyridine , 4 - ethylpyridine , 5 - ethylpyridine , 2 - methyl - 5 - ethylpyridine , 2 - dimethylaminopyridine and the like can also be used in the examples below as alkaline reagents . 5 g ( 8 . 25 mmol ) fulvestrant was added into a 500 ml three - necked round - bottom flask and dissolved with 300 ml methylene chloride while stirring . then , 0 . 137 g ( 1 . 1 mmol ) 4 - dimethylaminopyridine ( dmap ), 2 . 155 g ( 8 . 41 mmol ) palmitic acid and 1 . 672 g ( 8 . 23 mmol ) n , n - dicyclohexylcarbodiimide ( dcc ) was added sequentially into said flask . after reacting at room temperature ( e . g ., 20 ± 5 ) for 48 h , the reaction was stopped . the reaction mixture was filtered to remove precipitated by - product n , n ′- dicyclohexylurea ( dcu ). the filtrate was washed with saturated sodium bicarbonate solution , then washed with water to neutral , and then evaporated by rotary evaporator to remove methylene chloride . colorless and clear colloidal liquid ( 8 . 8 g ) was obtained , which was dissolved in an appropriate amount of ethyl acetate , froze in a refrigerator ( e . g ., the freezing temperature may be − 15 ± 3 ). a small amount of white solid precipitated was washed out and removed by filtration for 3 times . then , the filtrate was evaporated by rotary evaporator to remove ethyl acetate , and colorless and clear colloidal liquid was obtained . the colorless and clear colloidal liquid was dissolved in a small amount of tetrahydrofuran , then the solution was added to n - hexane to form a large quantity of white solid , which was left to stand and filtrated ; the filter cake was dissolved in the aforesaid tetrahydrofuran and settled in n - hexane for 3 times to give white powder product , which was pure compound ii . the product was dried in vacuum at 60 to give 1 . 5 g ii ( purity 99 . 88 % as determined by hplc , c18 column , mobile phase : 67 % thf in water , flow rate : 1 . 0 ml / min , detection wavelength : 220 nm ), and the molar yield was 22 %. ir ( cm − 1 ): 3209 , 2922 , 2852 , 1607 , 1503 , 1446 , 1385 , 1106 , 1055 , 1014 , 982 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): 0 . 78 ( s , 3h ), 0 . 88 ( t , 3h ), 1 . 01 - 1 . 52 ( t , 32h ), 1 . 59 - 1 . 63 ( t , 6h ), 1 . 70 - 1 . 76 ( t , 6h ), 1 . 89 - 1 . 94 ( t , 2h ), 2 . 10 - 2 . 32 ( t , 10h ), 2 . 61 - 2 . 85 ( t , 8h ), 3 . 74 ( t , 2h ), 6 . 20 ( d , j = 10 hz , 1h ), 6 . 56 - 7 . 14 ( t , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): 172 . 67 , 154 . 23 , 136 . 88 , 131 . 04 , 126 . 93 , 117 . 67 , 113 . 01 , 82 . 02 , 52 . 41 , 50 . 83 , 46 . 49 , 43 . 40 , 42 . 05 , 38 . 23 , 36 . 92 , 34 . 74 , 34 . 65 , 33 . 35 , 33 . 24 , 31 . 93 , 30 . 51 , 29 . 92 - 28 . 22 , 27 . 24 , 25 . 62 , 25 . 00 , 22 . 63 , 14 . 65 , 14 . 09 , 11 . 12 . 3 g ( 4 . 95 mmol ) fulvestrant was added into a 250 ml round - bottom flask and dissolved with 160 ml methylene chloride while stirring . then 0 . 0822 g ( 0 . 66 mmol ) dmap , 0 . 96 g ( 5 . 05 mmol ) undecanoic acid and 1 . 02 g ( 4 . 98 mmol ) dcc was added sequentially into said flask . after reacting under stirring at room temperature ( e . g ., 20 ± 5 ) for 48 h , the reaction was stopped . the reaction system was first frozen to precipitate as much reaction by - product dcu as possible . after being filtered to remove solid dcu , the filtrate was washed with saturated sodium bicarbonate solution , then washed with water to neutral and evaporated by rotary evaporator to remove methylene chloride , to give colorless and clear colloidal liquid , which was dissolved in a small amount of ethyl acetate and then froze in a refrigerator ( e . g ., the freezing temperature may be − 15 ± 3 ° c .) until no white solid dcu precipitated out . the filtrate was concentrated to remove ethyl acetate , recrystallized from mixed solvent of n - hexane - ethyl acetate , and then filtered to remove white solid precipitated out ( unreacted raw material fulvestrant ). the mother liquor was spin - dried to give colorless oily matter . said oily matter was further purified by silica - gel column chromatography ( the eluent was n - hexane - ethyl acetate ( 1 : 1 , volume ratio )) and was then evaporated by rotary evaporator to give 1 . 0611 g colorless oily matter , which was compound i ( purity 99 . 104 % as determined by hplc according to the same determination method in example 1 ), and the molar yield was 27 . 7 %. ir ( cm - 1 ): 3385 , 2926 , 2855 , 1756 , 1494 , 1463 , 1199 , 1152 , 1059 , 1017 , 985 , 721 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 28 ( s , 1h ), 6 . 83 ( d , 1h ), 6 . 77 ( d , 1h ), 3 . 73 ( t , 1h , j = 8 hz ), 2 . 88 - 1 . 17 ( t , 57h ), 0 . 89 ( s , 3h ), 0 . 77 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 172 . 64 , 148 . 52 , 137 . 13 , 126 . 91 , 122 . 37 , 120 . 10 , 118 . 64 , 81 . 93 , 52 . 75 , 51 . 03 , 46 . 47 , 43 . 33 , 41 . 67 , 38 . 23 , 36 . 89 , 34 . 50 , 34 . 45 , 33 . 85 , 31 . 89 , 29 . 67 , 29 . 50 , 29 . 63 , 29 . 55 , 29 . 49 , 29 . 46 , 29 . 34 , 29 . 30 , 29 . 26 , 29 . 16 , 29 . 12 , 28 . 80 , 28 . 23 , 27 . 11 , 25 . 70 , 25 . 01 , 24 . 88 , 22 . 66 , 14 . 62 , 14 . 50 , 11 . 50 . 3 g ( 4 . 95 mmol ) fulvestrant was added into a 250 ml round - bottom flask and then dissolved with 160 ml methylene chloride while stirring . then , 0 . 0822 g ( 0 . 66 mmol ) dmap , 1 . 87 g ( 5 . 05 mmol ) docosanoic acid and 1 . 02 g ( 4 . 98 mmol ) dcc was added sequentially into said flask . after reacting under stirring at room temperature ( e . g ., 20 ± 5 ° c .) for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 2 to give 1 . 016 g white solid powder ( purity 92 . 634 %, determined by hplc ) ( c18 column , mobile phase : 75 % thf in water , flow rate : 1 . 0 ml / min , detection wavelength : 220 nm ), which was compound iii , and the molar yield was 22 . 1 %. ir ( cm - 1 ): 3607 , 3424 , 2919 , 2851 , 1754 , 1495 , 1471 , 1199 , 1153 , 1141 , 1112 , 1081 , 985 , 719 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 28 ( d , 1h ), 6 . 83 ( d , 1h ), 6 . 77 ( d , 1h ), 3 . 74 ( t , 1h , j = 8 hz ), 2 . 91 - 1 . 05 ( t , 79h ), 0 . 89 ( t , 3h ), 0 . 77 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 172 . 64 , 148 . 53 , 137 . 13 , 126 . 91 , 122 . 37 , 118 . 64 , 81 . 93 , 52 . 83 , 51 . 11 , 46 . 48 , 43 . 34 , 41 . 68 , 38 . 24 , 36 . 89 , 34 . 50 , 33 . 15 , 31 . 94 , 30 . 56 , 29 . 94 , 29 . 86 , 29 . 71 , 29 . 67 , 29 . 63 , 29 . 62 , 29 . 51 , 29 . 48 , 29 . 37 , 29 . 35 , 29 . 27 , 29 . 17 , 29 . 13 , 28 . 81 , 28 . 23 , 27 . 12 , 25 . 70 , 25 . 01 , 24 . 88 , 23 . 16 , 22 . 66 , 14 . 50 , 14 . 01 , 11 . 50 . 3 g ( 4 . 95 mmol ) fulvestrant was added into a 250 ml round - bottom flask and then dissolved with 160 ml methylene chloride while stirring . then , 0 . 0822 g ( 0 . 66 mmol ) dmap , 1 . 44 g ( 5 . 05 mmol ) isostearic acid and 1 . 02 g ( 4 . 98 mmol ) dcc was added sequentially into said flask . after reacting under stirring at room temperature ( e . g ., 20 ± 5 ° c .) for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 2 to give 1 . 0028 g colorless colloid ( purity 99 . 312 %, determined by hplc ) ( according to the same determination method in example 3 ), which was compound iv , and the molar yield was 23 . 2 %. ir ( cm - 1 ): 3396 , 2928 , 2866 , 1748 , 1494 , 1466 , 1364 , 1198 , 1149 , 1121 , 1058 , 1017 , 984 , 720 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 28 ( s , 1h ), 6 . 83 ( d , 1h ), 6 . 76 ( s , 1h ), 3 . 74 ( t , 1h , j = 8 hz ), 2 . 35 - 1 . 03 ( t , 71h ), 1 . 09 - 0 . 94 ( t , 3h ), 0 . 89 ( s , 3h ), 0 . 77 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 171 . 15 , 148 . 60 , 137 . 03 , 126 . 88 , 122 . 45 , 118 . 72 , 81 . 94 , 53 . 34 , 53 . 04 , 52 . 82 , 51 . 39 , 50 . 96 , 48 . 46 , 48 . 39 , 48 . 32 , 46 . 48 , 43 . 33 , 41 . 68 , 38 . 21 , 37 . 92 , 37 . 86 , 37 . 79 , 36 . 89 , 34 . 50 , 33 . 16 , 32 . 37 , 32 . 05 , 31 . 11 , 30 . 56 , 30 . 06 , 29 . 96 , 29 . 87 , 29 . 69 , 29 . 55 , 29 . 50 , 29 . 37 , 29 . 32 , 29 . 18 , 28 . 81 , 28 . 26 , 27 . 11 , 26 . 09 , 25 . 65 , 24 . 81 , 22 . 66 , 21 . 21 , 19 . 40 , 14 . 61 , 14 . 50 , 11 . 51 . 0 . 36 g ( 0 . 6 mmol ) fulvestrant was added into a 50 ml round - bottom flask and then dissolved with 25 ml methylene chloride while stirring . then , 9 . 93 mg ( 0 . 08 mmol ) dmap , 0 . 113 g ( 0 . 61 mmol ) undecenoic acid and 0 . 13 g ( 0 . 64 mmol ) dcc was added sequentially into said flask . after reacting under stirring at room temperature ( e . g ., 20 ± 5 ° c .) for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 2 to give light yellow oily matter , which was further purified by silica - gel column chromatography for 3 times and neutral alumina for once and was evaporated to dryness to give 0 . 1 g light yellow oily matter ( purity 96 . 010 %, determined by hplc ) ( according to the same determination method in example 3 ). the obtained light yellow oily matter was compound v , and the molar yield was 21 . 5 %. ir ( kbr , cm - 1 ): 3387 , 2927 , 2855 , 1736 , 1652 , 1494 , 1461 , 1356 , 1312 , 1198 , 1154 , 1121 , 1059 , 1016 , 983 , 721 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 27 ( t , 1h ), 7 . 15 ( t , 1h ), 6 . 87 ( s , 1h ), 6 . 82 ( s , 1h ), 6 . 43 ( t , 2h ), 5 . 99 ( t , 1h ), 3 . 74 ( t , 1h , j = 8 hz ), 3 . 2 - 1 . 1 ( t , 51h ), 0 . 89 ( t , 3h , j = 7 hz ), 0 . 77 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 170 . 90 , 165 . 38 , 151 . 71 , 148 . 55 , 137 . 10 , 135 . 55 , 126 . 91 , 122 . 44 , 120 . 94 , 120 . 12 , 118 . 79 , 81 . 93 , 52 . 77 , 51 . 04 , 46 . 50 , 43 . 35 , 41 . 71 , 38 . 27 , 36 . 91 , 34 . 51 , 33 . 18 , 31 . 85 , 30 . 56 , 29 . 94 , 29 . 87 , 29 . 70 , 29 . 62 , 29 . 51 , 29 . 36 , 29 . 34 , 29 . 19 , 29 . 16 , 29 . 09 , 28 . 96 , 28 . 81 , 28 . 23 , 27 . 13 , 25 . 70 , 24 . 88 , 22 . 66 , 14 . 50 , 13 . 50 , 11 . 10 . 0 . 36 g ( 0 . 6 mmol ) fulvestrant was added into a 50 ml round - bottom flask and then , dissolved with 25 ml methylene chloride while stirring . then , 9 . 93 mg ( 0 . 08 mmol ) dmap , 0 . 185 g ( 0 . 61 mmol ) eicosapentaenoic acid and 0 . 13 g ( 0 . 64 mmol ) dcc was added sequentially into said flask . after reacting under stirring at room temperature ( e . g ., 20 ± 5 ° c .) for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 2 to give 0 . 31 mg light yellow oily matter ( purity 99 . 195 %, determined by hplc with the method referred to the method in example 3 ), which was compound vi , and the yield was 58 %. ir ( cm - 1 ): 3396 , 3012 , 2927 , 2855 , 1756 , 1609 , 1494 , 1456 , 1312 , 1198 , 1137 , 1058 , 1018 , 985 , 719 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 28 ( t , 1h ), 6 . 84 ( t , 1h , j = 7 . 5 hz ), 6 . 77 ( d , 1h ), 5 . 43 - 5 . 32 ( t , 10h ), 3 . 74 ( t , 1h , j = 8 hz ), 2 . 87 - 1 . 18 ( t , 55h ), 0 . 97 ( t , 3h , j = 7 . 5 hz ), 0 . 77 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 172 . 38 , 137 . 19 , 132 . 05 , 129 . 07 , 128 . 84 , 128 . 59 , 128 . 29 , 128 . 22 , 128 . 10 , 127 . 89 , 127 . 03 , 126 . 94 , 122 . 34 , 118 . 62 , 81 . 94 , 52 . 76 , 51 . 05 , 46 . 48 , 43 . 34 , 41 . 67 , 38 . 23 , 36 . 89 , 34 . 50 , 33 . 78 , 33 . 15 , 30 . 56 , 29 . 95 , 29 . 86 , 29 . 68 , 29 . 65 , 29 . 50 , 29 . 36 , 29 . 18 , 28 . 82 , 28 . 24 , 27 . 12 , 26 . 56 , 25 . 70 , 25 . 66 , 25 . 65 , 25 . 56 , 24 . 82 , 22 . 66 , 20 . 85 , 14 . 50 , 13 . 50 , 11 . 50 . 0 . 36 g ( 0 . 6 mmol ) fulvestrant was added into a 50 ml round - bottom flask and then dissolved with 25 ml methylene chloride while stirring . then , 9 . 93 mg ( 0 . 08 mmol ) dmap , 0 . 2 g ( 0 . 61 mmol ) docosahexenoic acid and 0 . 13 g ( 0 . 64 mmol ) dcc was added sequentially into said flask . after reacting under stirring at room temperature ( e . g ., 20 ± 5 ° c .) for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 2 to give 0 . 1165 g light yellow oily matter ( purity 99 . 051 %, determined by hplc with the method referred to the method in example 3 ), which was compound vii , and the yield was 21 . 1 %. ir ( cm - 1 ): 3396 , 3013 , 2927 , 2855 , 1756 , 1609 , 1494 , 1456 , 1358 , 1198 , 1138 , 1059 , 1018 , 984 , 719 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 27 ( t , 1h ), 6 . 83 ( d , 1h ), 6 . 77 ( t , 1h ), 5 . 4 - 5 . 3 ( t , 12h ), 3 . 74 ( t , j = 8 hz , 1h ), 2 . 8 - 1 . 1 ( t , 55h ), 0 . 97 ( t , 3h ), 0 . 77 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 171 . 88 , 148 . 47 , 137 . 22 , 132 . 05 , 129 . 62 , 128 . 58 , 128 . 33 , 128 . 29 , 128 . 26 , 128 . 11 , 128 . 09 , 128 . 04 , 127 . 89 , 127 . 64 , 127 . 03 , 126 . 93 , 122 . 35 , 118 . 62 , 81 . 94 , 52 . 76 , 51 . 05 , 46 . 48 , 43 . 34 , 41 . 67 , 38 . 23 , 36 . 89 , 34 . 50 , 34 . 34 , 33 . 14 , 30 . 56 , 29 . 94 , 29 . 85 , 29 . 68 , 29 . 65 , 29 . 50 , 29 . 36 , 29 . 18 , 28 . 82 , 28 . 24 , 27 . 12 , 25 . 70 , 25 . 66 , 25 . 64 , 25 . 55 , 22 . 85 , 22 . 66 , 22 . 58 , 20 . 57 , 14 . 30 , 14 . 10 , 11 . 50 . 0 . 31 g ( 0 . 4 mmol ) compound v ( synthesized in example 5 ), 4 ml ( 40 mmol ) acetic anhydride , 0 . 2 g ( 1 . 6 mmol ) 4 - dimethylaminopyridine ( dmap ) was sequentially added into a 50 ml round - bottom flask . after reflux reacting for 48 h , the reaction was stopped . after the reaction system was cooled , it was washed with water to neutral and phase separated . the organic layer was spin - dried and purified by silica - gel column chromatography through gradient eluting ( the eluent was n - hexane - ethyl acetate ( 40 : 1 / 10 : 1 / 5 : 1 , volume ratio )). then , the eluent was evaporated to dryness to give milky white colloidal liquid , which was compound viii . ir ( cm - 1 ): 3449 , 2927 , 2855 , 1736 , 1651 , 1494 , 1461 , 1373 , 1360 , 1311 , 1245 , 1198 , 1154 , 1121 , 1045 , 1027 , 983 , 896 , 822 , 720 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 27 ( t , 1h ), 7 . 15 ( t , 1h ), 6 . 87 ( t , 1 h ), 6 . 81 ( d , 1h ), 6 . 40 ( t , 1h ), 6 . 00 ( d , 1h ), 5 . 63 ( t , 1h ), 4 . 70 ( t , 1h ), 2 . 7 - 1 . 1 ( t , 52h ), 2 . 05 ( t , 3h ), 0 . 89 ( t , 3h ), 0 . 82 ( s , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 170 . 90 , 165 . 36 , 151 . 72 , 148 . 56 , 137 . 07 , 136 . 97 , 126 . 92 , 122 . 43 , 122 . 32 , 120 . 92 , 118 . 73 , 82 . 76 , 52 . 71 , 50 . 98 , 46 . 26 , 42 . 94 , 41 . 40 , 38 . 20 , 38 . 12 , 37 . 06 , 34 . 50 , 33 . 17 , 32 . 50 , 32 . 41 , 31 . 84 , 29 . 85 , 29 . 67 , 29 . 55 , 29 . 49 , 29 . 35 , 29 . 32 , 29 . 18 , 29 . 15 , 28 . 79 , 28 . 16 , 26 . 96 , 25 . 64 , 22 . 78 , 22 . 65 , 21 . 17 , 14 . 63 , 12 . 02 . 0 . 3 g ( 0 . 35 mmol ) compound iv ( synthesized in example 4 ), 3 . 5 ml ( 35 mmol ) acetic anhydride and 0 . 18 g ( 1 . 44 mmol ) 4 - dimethylaminopyridine ( dmap ) was sequentially added and then 30 ml tetrahydrofuran was added into a 50 ml round - bottom flask . after reflux reacting for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 8 to give milky white colloidal liquid , which was compound ix . ir ( cm - 1 ): 3311 , 2927 , 2854 , 1736 , 1665 , 1494 , 1460 , 1365 , 1245 , 1200 , 1045 , 1027 , 984 , 803 , 720 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 27 ( t , 1h ), 6 . 82 ( t , 1h ), 6 . 76 ( t , 1h ), 4 . 70 ( t , 1h ), 2 . 77 - 1 . 08 ( t , 49h ), 2 . 05 ( t , 3h ), 0 . 81 - 0 . 95 ( t , 27h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 174 . 36 , 171 . 23 , 148 . 55 , 136 . 95 , 126 . 90 , 122 . 45 , 122 . 39 , 118 . 74 , 118 . 71 , 82 . 76 , 53 . 11 , 53 . 03 , 52 . 81 , 51 . 39 , 48 . 45 , 48 . 31 , 46 . 25 , 42 . 94 , 41 . 40 , 38 . 07 , 37 . 78 , 37 . 05 , 34 . 50 , 33 . 16 , 32 . 36 , 32 . 05 , 31 . 93 , 31 . 44 , 30 . 19 , 30 . 05 , 30 . 03 , 29 . 88 , 29 . 67 , 29 . 55 , 29 . 49 , 29 . 35 , 29 . 30 , 29 . 17 , 28 . 80 , 28 . 19 , 27 . 52 , 26 . 99 , 25 . 66 , 22 . 69 , 21 . 17 , 20 . 35 , 19 . 93 , 14 . 63 , 12 . 02 . 0 . 3 g ( 0 . 35 mmol ) compound v ( synthesized in example 5 ), 3 . 5 ml ( 35 mmol ) butyric anhydride and 0 . 18 g ( 1 . 44 mmol ) 4 - dimethylaminopyridine ( dmap ) was sequentially added and then 30 ml tetrahydrofuran was added into a 50 ml round - bottom flask . after reflux reacting for 48 h , the reaction was stopped . reaction liquid was treated according to the post process in example 8 to give milky white colloidal liquid , which was compound x . ir ( cm - 1 ): 3441 , 2927 , 2855 , 1734 , 1651 , 1494 , 1460 , 1197 , 1154 , 1120 , 1092 , 1019 , 983 , 803 , 720 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 27 ( t , 1h ), 7 . 15 ( t , 1h ), 6 . 88 ( t , 1h ), 6 . 81 ( d , 1h ), 6 . 40 ( t , 1h ), 6 . 00 ( d , 1h ), 5 . 63 ( t , 1h ), 4 . 70 ( t , 1h ), 2 . 7 - 1 . 0 ( t , 56h ), 0 . 96 ( t , 3h ), 0 . 88 ( t , 3h ), 0 . 82 ( t , 3h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 173 . 79 , 165 . 38 , 151 . 73 , 148 . 57 , 137 . 02 , 136 . 99 , 126 . 93 , 122 . 45 , 122 . 39 , 120 . 60 , 118 . 67 , 82 . 45 , 52 . 73 , 50 . 99 , 46 . 28 , 43 . 02 , 41 . 42 , 38 . 21 , 38 . 14 , 37 . 10 , 36 . 52 , 36 . 28 , 34 . 51 , 33 . 19 , 32 . 51 , 32 . 43 , 31 . 85 , 29 . 86 , 29 . 68 , 29 . 56 , 29 . 50 , 29 . 36 , 29 . 33 , 29 . 19 , 29 . 17 , 28 . 81 , 28 . 18 , 27 . 58 , 26 . 99 , 25 . 65 , 22 . 82 , 22 . 66 , 18 . 69 , 14 . 50 , 12 . 02 , 12 . 00 . 0 . 69 g ( 0 . 89 mmol ) compound iv ( synthesized in example 4 ), 14 . 5 ml ( 89 mmol ) butyric anhydride and 0 . 44 g ( 3 . 52 mmol ) 4 - dimethylaminopyridine ( dmap ) was sequentially added and then 69 ml tetrahydrofuran was added into a 50 ml round - bottom flask . after reflux reacting for 48 h , the reaction was stopped . after the reaction system was cooled , it was washed with water to neutral and phase separated . the organic layer was spin - dried and purified by silica - gel column chromatography through gradient eluting ( the eluent was n - hexane - ethyl acetate ( 40 : 1 / 10 : 1 / 5 : 1 , volume ratio )). then , the eluent was evaporated to dryness to give crude product , which was then treated by ultrasonic water washing for several times . during said water washing process , the crude product attached to walls of flask in the form of colloid and water phase was poured directly after washing . washing was repeated until the product had no smell of butyric acid . finally , the product was quickly eluted with ethanol and the solvent was removed in a decompressed oven to give milky white colloidal liquid , which was compound xi . ir ( cm - 1 ): 3448 , 2390 , 2857 , 1750 , 1734 , 1609 , 1494 , 1465 , 1364 , 1198 , 1150 , 1121 , 1094 , 1048 , 1019 , 984 , 905 , 803 , 732 . 1 hnmr ( 500 mhz , cdcl3 , ppm ): δ 7 . 27 ( t , 1h ), 6 . 82 ( t , 1h ), 6 . 76 ( s , 1 h ), 4 . 71 ( t , 1h ), 1 . 09 - 2 . 77 ( t , 53h ), 0 . 81 - 1 . 08 ( t , 30h ). 13 cnmr ( 125 mhz , cdcl3 , ppm ): δ 174 . 36 , 173 . 78 , 148 . 54 , 136 . 95 , 126 . 90 , 122 . 45 , 122 . 39 , 118 . 73 , 118 . 71 , 82 . 45 , 53 . 33 , 53 . 03 , 52 . 82 , 51 . 39 , 48 . 45 , 48 . 31 , 46 . 27 , 43 . 00 , 41 . 41 , 38 . 08 , 37 . 76 , 37 . 09 , 36 . 52 , 34 . 50 , 33 . 17 , 32 . 36 , 32 . 05 , 31 . 10 , 31 . 07 , 30 . 05 , 30 . 03 , 30 . 01 , 29 . 88 , 29 . 68 , 29 . 59 , 29 . 55 , 29 . 50 , 29 . 35 , 29 . 31 , 29 . 21 , 29 . 17 , 28 . 81 , 28 . 20 , 27 . 57 , 27 . 01 , 25 . 67 , 22 . 58 , 22 . 40 , 19 . 93 , 18 . 59 , 14 . 64 , 13 . 69 , 12 . 06 . solubility experiments of fulvestrant and ester derivatives thereof in different solvents fulvestrant and ester derivatives of fulvestrant were accurately weighed to an appropriate amount respectively . their solubilities ( in mg / ml ) in different oils and solvents were compared according to general notice in section 2 of chinese pharmacopoeia ( 2010 ). the results are shown in table 1 : it can be seen that , compared with the solubility of fulvestrant , the solubility of compound ii in lipophilic solvents including castor oil , soybean oil , medium - chain oil increased significantly , yet had almost no change in propylene glycol , and decreased significantly in hydrophilic solvent peg 400 ; meanwhile , the solubilities of derivatives such as compounds i , iii and iv in lipophilic soybean oil were significantly greater than that of fulvestrant . the growth inhibition effects of fulvestrant , compounds ii and x on human breast cancer mcf - 7 xenografted in nude mice test drugs : fulvestrant , compounds ii and x are dispersed in oil and sterilized to be prepared as oiling agents respectively . experimental animals and grouping thereof , source , germline and strain : balb / c female nude mice , provided by laboratory animal research center of academy of military medical sciences of china ( laboratory animal production license : scxk ( military ) 2007 - 004 ), day - old : 35 - 40 days ; body weight : 18 - 24 g . the mice was divided into negative control group , positive control group ( fulvestrant oiling agent ), drug treatment groups ( compounds ii and x oiling agent respectively ), with 5 mice in each group . administration method , dose and time : the negative control group was administered with blank solvent ( oil ) by subcutaneous injecting 0 . 2 ml / 20 g for once ; positive control group was administered with fulvestrant oiling agent by subcutaneous injecting 100 mg / kg for once ; drug treatment groups were respectively administered with compounds ii and x by subcutaneous injecting 100 mg / kg for once . establishment of model and tumor measuring method : human breast cancer mcf - 7 cell lines in logarithmic growth phase were prepared into a cell suspension of 5 × 10 8 / ml under sterile condition , with 0 . 1 ml of which being inoculated to nude mice at their right armpits subcutaneously . xenografted tumors of nude mice were measured for diameter with vernier caliper , and animals were randomly grouped when the tumors grew to 100 - 300 mm 3 . the administration volume to each of the mice was 0 . 2 ml / 20 g by subcutaneous injection at head and neck region . 28 days after administration , the mice were sacrificed and the tumors were stripped by surgery and weighed . tumor inhibition rate was calculated ( inhibition rate =( 1 - tumor weight in the experimental group / tumor weight in the control group )× 100 %). the results are shown in table 2 below :
the present invention provides a class of fulvestrant ester derivatives and preparation method thereof . such a compound is an aliphatic ester formed by esterifying the — oh at positions c - 3 and c - 17 of fulvestrant , having a structure of the following formula : in the formula , substituent r is h , alkanoyl or alkenoyl having 2 to 22 carbon atoms or stereoisomers thereof ; substituent r ′ can be h , alkanoyl or alkenoyl having 2 to 4 carbon atoms or stereoisomers thereof ; such an aliphatic ester compound being used as a pro - drug can improve the stability of a compound , meanwhile the decrease of polarity can enable them to be easily made into preparations like lipid emulsion , microsphere etc ., and avoid the degradation of the compound caused by factors like high temperature etc . and the use of an organic solution during preparation process .