(4aS,4bS,8S,8aS)-8-tert-Butoxy-8a-methyl-1-[2-(2-methyl-[1,3]dioxolan-2-yl)-ethyl]-4,4a,4b,5,6,7,8,8a,9,10-decahydro-3H-phenanthren-2-one 在
sodium tetrahydroborate 、
potassium tert-butylate 、
乙酸酐 作用下,
生成
(4aS,4bS,8S,8aS)-8-tert-Butoxy-8a-methyl-1-[2-(2-methyl-[1,3]dioxolan-2-yl)-ethyl]-1,2,3,4,4a,4b,5,6,7,8,8a,9-dodecahydro-phenanthren-2-ol