19-Hydroxy-19-methyl-6a-carba-PGI2 compounds
CROSS REFERENCE TO RELATED APPLICATION 
     The present invention is a divisional application of United States Ser. No. 054,720, filed July 5, 1979 now U.S. Pat. No. 4,225,507. 
    
    
     BACKGROUND OF THE INVENTION 
     The present invention provides novel prostacyclin analogs. Particularly, the present invention relates to prostacyclin analogs substituted at the C-19 position by hydroxy. 
     Particularly, the present invention relates to 19-hydroxy-19-methyl-6a-carba-PGI 2  compounds. The novel prostacyclin analogs are useful for pharmacological purposes, e.g., as anti-asthmatic agents. The preparation and use of these compounds is incorporated here by reference from U.S. Pat. No. 4,225,507, filed July 5, 1979. 
     PRIOR ART 
     For background on prostacyclin, see for example R. A. Johnson, et al., Prostaglandins 12, 915-928 (1976) and R. A. Johnson, et al., J. Am. Chem. Soc. 100, 7690-7704 (1978), and, as to pharmacological activity, the references cited therein. For analogs of prostacyclin, see, for example, J. Fried, et al., Proc. Natl. Acad. Sci. U.S.A. 74, 2199-2203, K. C. Nicolaou, et al., J.C.S. Chem. Comm. 1977, 331-332, N. A. Nelson, J. Am. Chem. Soc. 99, 7362-7363 (1977), and K. Kojima, et al., Tetra. Letters, 1978, (1977), and K. Kojima, et al., Tetra. Letters, 1978, 3743-3746. Regarding the nomenclature for analogs of PGI 2 , see R. A. Johnson, et al., Prostaglandins 15, 737-740 (1978). 
    
    
     SUMMARY OF THE INVENTION 
     The present invention particularly provides a prostacyclin-type compound of the formula ##STR1## wherein L 3  is (1)--(CH 2 ) n  --, wherein n is one to 5, inclusive, 
     (2)--(CH 2 ) p  --CF 2  --, wherein p is 2, 3, or 4, 
     or 
     (3)--CH 2  --CH═CH--; 
     wherein M 2  is ##STR2## wherein Q is oxo, α-H:β-H, α-OH:β-R 4 , or αR 4  :β-OH, 
     wherein R 4  is hydrogen or alkyl of one to 4 carbon atoms, inclusive, 
     wherein R 3  is 
     (a) hydrogen, 
     (b) alkyl of one to 12 carbon atoms, inclusive, 
     (c) cycloalkyl of 3 to 10 carbon atoms, inclusive, 
     (d) aralkyl of 7 to 12 carbon atoms, inclusive, 
     (e) phenyl, 
     (f) phenyl substituted with one, 2, or 3 chloro or alkyl groups of one to 3 carbon atoms, inclusive; 
     (g) --(Ph)--CO--CH 3 , 
     (h) --(p--Ph)--NH--CO--(p--Ph)--NH--CO--CH 3 , 
     (i) --(p--Ph)--NH--CO--(p--Ph), 
     (j) --(p--Ph)--NH--CO--CH 3 , 
     (k) --(p--Ph)--NH--CO--NH 2 , 
     (l) --(p--Ph)--CH═N--NH--CO--NH 2 , 
     (m) β--naphthyl, 
     (n) --CH 2  --CO--R 16 , 
     wherein --(Ph)-- is inter-phenylene and --(p--Ph) is inter-para-phenylene or para-phenyl; 
     wherein R 16  is phenyl, p-bromophenyl, p-biphenylyl, p-nitrophenyl, p-benzamidophenyl, or 2-naphthyl, or 
     (o) a pharmacologically acceptable cation; wherein R 7  and R 8  are hydrogen, alkyl of one to 12 carbon atoms, inclusive, benzyl, or phenyl, being the same or different, and wherein R 15  is hydrogen, alkyl of one to 12 carbon atoms, inclusive, phenyl, phenyl-substituted with one, 2, or 3 chloro or alkyl groups of one to 3 carbon atoms, inclusive, or phenyl substituted with hydroxycarbonyl or alkoxycarbonyl of one to 4 carbon atoms, inclusive, wherein R 5  and R 6  are hydrogen, alkyl of one to 4 carbon atoms, inclusive, or fluoro, being the same or different, with the proviso that one of R 5  and R 6  is fluoro only when the other is hydrogen or fluoro; 
     wherein R 9  is hydrogen or hydroxyl; and 
     wherein X is 
     (1) trans--CH═CH--, 
     (2) cis--CH═CH--, 
     (3) --C.tbd.C--, or 
     (4) --CH 2  CH 2  --.