(4S,4aR,7S,8S,8aR)-8-{2-[(4R,6S)-6-(2-Benzyloxy-ethyl)-2,2-dimethyl-[1,3]dioxan-4-yl]-ethyl}-4-(tert-butyl-dimethyl-silanyloxy)-7-methyl-4a,7,8,8a-tetrahydro-4H-naphthalen-1-one 、 alkaline earth salt of/the/ methylsulfuric acid 以
乙醚 为溶剂,
以91%的产率得到(3R,4S,4aR,7S,8S,8aR)-8-{2-[(4R,6S)-6-(2-Benzyloxy-ethyl)-2,2-dimethyl-[1,3]dioxan-4-yl]-ethyl}-4-(tert-butyl-dimethyl-silanyloxy)-3,7-dimethyl-3,4,4a,7,8,8a-hexahydro-2H-naphthalen-1-one