6(R)-[2-[8(S)-(2,2-dimethylbutyryloxy)-2(S)-methyl-6-hydroxymethyl-1,2,3,7,8,8a(R)-hexahydronaphthyl-1(S)]-ethyl]-4(R)-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one 、
异氰酸苯酯 以
吡啶 、
乙醚 、
正己烷 为溶剂,
生成
6(R)-[2-[8(S)-(2,2-dimethylbutyryloxy)-2(S)-methyl-6-phenylaminocarbonyloxymethyl-1,2,3,7,8,8a(R)-hexahydronaphthyl-1(S)]-ethyl]-4(R)-hydroxy-3,4,5,6-tetrahydro-2H-pyran-2-one