Acetic acid (3S,5S,8R,9S,10S,13R,14S,16R,17R)-17-((S)-1-acetoxy-ethyl)-3,16-bis-dimethylamino-10-methyl-hexadecahydro-cyclopenta[a]phenanthren-13-ylmethyl ester 、
碘甲烷 以
丙酮 为溶剂,
反应 6.0h,
以95%的产率得到monoiodomethylate de N,N-bisdimethylamino-3β, 16α, diacetoxy-18, 20 S, pregnane-5α