(2RS,3SR)-4-[(2S,3S)-3-(tert-butyl-dimethyl-silanyloxymethyl)-2-methyl-oxiranyl]-2,3-dihydroxy-butyric acid methyl ester 在
4-甲基苯磺酸吡啶 作用下,
以
二氯甲烷 为溶剂,
反应 0.5h,
以90%的产率得到(2S,3R,5R)-5-[(S)-2-(tert-butyl-dimethyl-silanyloxy)-1-hydroxy-ethyl]-3-hydroxy-5-methyl-tetrahydro-furan-2-carboxylic acid methyl ester