(25R)-3β-Acetoxy-12,13-seco-5α-spirost-13-en-12-on 在
sodium tetrahydroborate 作用下,
以
乙醇 为溶剂,
反应 0.5h,
以99%的产率得到(2S,4aS,5S,6R,8aS)-5-(2-hydroxyethyl)-4a-methyl-6-((2R,3S,5'R)-3,4,5'-trimethyl-3,3a,3',4',5',6,6a,6'-octahydrospiro[cyclopenta[b]furan-2,2'-pyran]-5-yl)decahydronaphthalen-2-yl acetate