描述:
(2R,4R)-2-((3S,8R,9S,10R,13R,14S,15R,17R)-15-(benzoyloxy)-3-((tert-butyldiphenylsilyl)oxy)-10,13-dimethyl-7-oxo-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-6-methylheptan-4-yl benzoate 在
sodium tetrahydroborate 、 cerium(III) chloride 作用下,
以89%的产率得到[(3S,7R,8R,9S,10R,13R,14S,15R,17R)-17-[(2R,4R)-4-benzoyloxy-6-methylheptan-2-yl]-3-[tert-butyl(diphenyl)silyl]oxy-7-hydroxy-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-15-yl] benzoate