(3R,5R,8R,9S,10S,11R,13R,14S,17S)-17-(((tert-butyldiphenylsilyl)oxy)methyl)-3-(dimethyl(phenyl)silyl)-11,14-dihydroxy-10-(((4-methoxybenzyl)oxy)methyl)-13-methyltetradecahydro-1H-cyclopenta[a]phenanthrene-1,7(2H)-dione 在
sodium tetrahydroborate 作用下,
以
乙醇 为溶剂,
反应 2.0h,
以97%的产率得到(1R,3R,5R,8R,9S,10S,11R,13R,14S,17S)-17-[[tert-butyl(diphenyl)silyl]oxymethyl]-3-[dimethyl(phenyl)silyl]-1,11,14-trihydroxy-10-[(4-methoxyphenyl)methoxymethyl]-13-methyl-2,3,4,5,6,8,9,11,12,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-7-one