Acetic acid (1S,4R)-1-isopropyl-4-((3S,5R,8S,10S,13R,14S,17R)-3-methoxy-4,4,10,13,14-pentamethyl-2,3,4,5,6,7,8,10,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-pentyl ester 在
sodium hydroxide 作用下,
以
甲醇 为溶剂,
反应 40.0h,
以90%的产率得到(24S)-3β-methoxy-5α-lanosta-9(11)-en-24-ol