K. Miyashita et al., NOVEL AND CHIRAL HANTZSCH-TYPE 1,4-DIHYDROPYRIDINES HAVING A P-TOLYLSULFINYL GROUP - SYNTHESIS AND BIOLOGICAL-ACTIVITIES AS CALCIUM-CHANNELANTAGONISTS, Chemical and Pharmaceutical Bulletin, 43(4), 1995, pp. 711-713
Both C-4 stereoisomers of novel Hantzsch-type 4-aryl- and 4-methyl-1,4
-dihydropyridines 3 having a polylsulfinyl group at C-5 were efficient
ly synthesized in optically pure forms starting from the alpha-sulfiny
l enones 6 which could be easily obtained from (-)-menthyl (S)-p-tolyl
sulfinate (4). The stereochemistry at C-4 was found to be largely resp
onsible for the biological activities as calcium channel antagonists o
f these compounds.