(23S)-17,23-epoxy-3β,30,31-trihydroxy-27-nor-5α-lanost-8-ene 在
吡啶 、 sodium tetrahydroborate 作用下,
以
甲醇 为溶剂,
反应 24.5h,
生成 [(3S,3'R,5R,5'S,10S,13S,14S,17S)-3-acetyloxy-4-(acetyloxymethyl)-5'-[(1R)-1-hydroxypropyl]-3',10,13,14-tetramethylspiro[1,2,3,5,6,7,11,12,15,16-decahydrocyclopenta[a]phenanthrene-17,2'-oxolane]-4-yl]methyl acetate