(13S,16R,17R)-16-bromo-3-methoxy-13-methyl-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl ethylcarbamate 在
氢氧化钾 作用下,
以
乙醇 为溶剂,
反应 0.75h,
以38%的产率得到(4bS,6aS,6bR,9aS,10aS,10bR)-9-Ethyl-2-methoxy-6a-methyl-4b,5,6,6a,6b,9,9a,10,10a,10b,11,12-dodecahydro-7-oxa-9-aza-pentaleno[2,1-a]phenanthren-8-one