(Z)-2-[(2R,3R)-3-Acetylamino-2-((R)-methanesulfinyl)-4-oxo-azetidin-1-yl]-3-methyl-pent-2-en-4-ynoic acid 2,2,2-trichloro-ethyl ester 在
oxonium 、 mercury(II) sulfate 作用下,
以70%的产率得到(Z)-2-[(2R,3R)-3-Acetylamino-2-((R)-methanesulfinyl)-4-oxo-azetidin-1-yl]-3-methyl-4-oxo-pent-2-enoic acid 2,2,2-trichloro-ethyl ester