[(1R,2S,5S,8S,9S,10S,13R,14S,17R)-2-Bromo-17-((R)-1,5-dimethyl-hexyl)-10,13-dimethyl-3-oxo-hexadecahydro-cyclopenta[a]phenanthren-1-yl]-acetic acid ethyl ester 在
氢氧化钾 作用下,
以
1,4-二氧六环 为溶剂,
反应 24.0h,
生成
1β,2β-dihydro-5α-cholest-1-eno(1,2-d)furan-2',3-dione