(R)-4-((3S,5R,7R,8R,9S,10S,13R,14S,17R)-3-Acetoxy-7-hydroxy-4,4,10,13,14-pentamethyl-11-oxo-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester 在
吡啶 、
sodium acetate 、
亚硝酰氯 作用下,
生成 (R)-4-((3S,5R,7R,8R,9S,10S,13R,14R,17R)-3,7-Diacetoxy-14-cyano-4,4,10,13-tetramethyl-11-oxo-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester