3β-acetoxy-5α-hydroxy-6-keto-24-norcholan-16α-ol-23-oic acid 23->16-δ-lactone 在
氯化亚砜 作用下,
以
吡啶 为溶剂,
以110 mg的产率得到Acetic acid (2S,4aR,4bS,6aS,6bR,7R,10aR,11aS,11bS)-4a,6a,7-trimethyl-9,13-dioxo-2,3,4,4a,4b,5,6,6a,6b,7,8,9,10a,11,11a,11b,12,13-octadecahydro-10-oxa-indeno[2,1-a]phenanthren-2-yl ester