(2R,6R,8S,10R)-10-(tert-Butyl-diphenyl-silanyloxy)-2-methoxy-2,8-dimethyl-1,7-dioxa-spiro[5.5]undec-3-en-5-one 、 alkaline earth salt of/the/ methylsulfuric acid 以
四氢呋喃 为溶剂,
以100%的产率得到(2R,3S,6R,8S,10R)-10-(tert-Butyl-diphenyl-silanyloxy)-2-methoxy-2,3,8-trimethyl-1,7-dioxa-spiro[5.5]undecan-5-one