(3S,4S,5R,8R,9R,10R,13S,14R,15S)-3,15-Diisopropyl-4-(2-methoxycarbonyl-ethyl)-4,9,10-trimethyl-hexadecahydro-cyclopenta[a]phenanthrene-13-carboxylic acid methyl ester 在
氢氧化钾 作用下,
以
甲醇 为溶剂,
反应 2.0h,
以80 mg的产率得到28-methyl ester of 3,4-secolupane-3,28-dioic acid