Acetic acid (3S,3aR,5aS,5bR,7aR,9S,11aS,13R)-9-acetoxy-3-(5,5-dimethyl-tetrahydro-furan-2-yl)-3a-hydroxy-3,5a,8,8,11a-pentamethyl-1-oxo-3a,4,5,5a,5b,6,7,7a,8,9,10,11,11a,13-tetradecahydro-3H-2-oxa-pentaleno[1,6a-a]phenanthren-13-yl ester 在
盐酸 作用下,
以
1,4-二氧六环 为溶剂,
反应 3.0h,
生成
22,25-epoxy-holosta-7,9(11)-diene-3β,17α-diol