(3S,3aR,5aR,7aR,7bR)-7a-Benzyloxy-3-[(R)-4-(tert-butyl-dimethyl-silanyloxy)-3,3-dimethyl-cyclopent-1-enyl]-3,6-dimethyl-3a,4,5,5a,7a,7b-hexahydro-3H-pentaleno[1,6-cd]pyran-1-one 、 alkaline earth salt of/the/ methylsulfuric acid 在
吡啶 、
4-异丙基甲苯 作用下,
生成 (2aR,4aS,6aR,8R,10aR,10bR)-8-(tert-butyldimethylsiloxy)-2,2a,4a,6,6a,7,8,9,10a,10b-decahydro-4a-(benzyloxy)-3,7,7,10-tetramethylcyclopenta[5,6]cyclooctal(1,2,3-cd)pentalen-5(1H)-one