(E)-(4S,5S)-5-tert-Butoxycarbonylamino-6-(tert-butyl-dimethyl-silanyloxy)-4-methanesulfonyloxy-hex-2-enoic acid methyl ester 、 alkaline earth salt of/the/ methylsulfuric acid 以
四氢呋喃 为溶剂,
以94%的产率得到(E)-(2S,5R)-5-tert-Butoxycarbonylamino-6-(tert-butyl-dimethyl-silanyloxy)-2-isobutyl-hex-3-enoic acid methyl ester