Acetic acid (3S,8S,9S,10R,13S,14S,17R)-17-[(R)-1-((2S,3R)-3-isobutyryl-oxiranyl)-ethyl]-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yl ester 在
aluminium amalgam 作用下,
以
乙醚 、
乙醇 为溶剂,
反应 4.0h,
以84%的产率得到(20S,22R)-3-β-acetoxy-22-hydroxycholest-5-en-24-one