6(R)-[2-[8(S)-(2,2-dimethylbutyryloxy)-2(S)-methyl-5-oxo-6 (R)-methyl-1,2,4a(R),6,7,8,8a(R)-heptahydronaphthyl-1(S)]ethyl]-4(R)-tert-butyldiphenylsilyloxy-3,4,5,6-tetrahydro-2H-pyran-2-one 、
水 在
sodium tetrahydroborate 作用下,
以
四氢呋喃 为溶剂,
生成
6(R)-[2-[8(S)-(2,2-dimethylbutyryloxy)-2(S)-methyl-5(R)-hydroxy-6(R)-methyl-1,2,4a(R),5,6,7,8,8a(R)-octahydronaphtyl-1(S)]ethyl]-4(R)-tert-butyldiphenylsilyloxy-3,4,5,6-tetrahydro-2H-pyran-2-one