4-((2S,3S)-3-{[(2R,3R)-2-Allyl-3-(tert-butyl-dimethyl-silanyloxy)-5-oxo-cyclopentyl]-hydroxy-methyl}-oxiranyl)-butyric acid methyl ester 在
4-二甲氨基吡啶 、
甲基磺酰氯 作用下,
以44.5%的产率得到4-{(2S,3S)-3-[(2R,3R)-2-Allyl-3-(tert-butyl-dimethyl-silanyloxy)-5-oxo-cyclopent-(E)-ylidenemethyl]-oxiranyl}-butyric acid methyl ester