(R)-3-((8S,9S,10S,13R,14S,17R)-2-Hydroxy-4,4,10,13-tetramethyl-3-oxo-4,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-17-yl)-butyric acid methyl ester 在
sodium tetrahydroborate 作用下,
以
四氢呋喃 、
甲醇 、
苯 为溶剂,
生成 (2S,3R,8S,9S,10R,13R,14S,17R)-17-((R)-3-Hydroxy-1,3-dimethyl-butyl)-4,4,10,13-tetramethyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthrene-2,3-diol