Acetic acid (3S,8R,9S,10R,13S,14S)-3-benzyloxy-17-((R)-1,5-dimethyl-hexyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-16-yl ester 在
potassium tert-butylate 、 Davis reagent 作用下,
以
四氢呋喃 为溶剂,
以75%的产率得到(3S,8R,9S,10R,13S,14S,17S)-3-Benzyloxy-17-((R)-1,5-dimethyl-hexyl)-17-hydroxy-10,13-dimethyl-1,2,3,4,7,8,9,10,11,12,13,14,15,17-tetradecahydro-cyclopenta[a]phenanthren-16-one