methyl 2-(tert-butyloxycarbonylamino)-2-(diethyloxyphosphoryl)acetate 、
Acetic acid (2R,3S,4R,5S,6S)-3-acetoxy-2-acetoxymethyl-5-acetylamino-6-(2-oxo-ethyl)-tetrahydro-pyran-4-yl ester 在
lithium diisopropyl amide 作用下,
生成 (Z)-2-tert-Butoxycarbonylamino-4-((2S,3S,4R,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-3-acetylamino-tetrahydro-pyran-2-yl)-but-2-enoic acid methyl ester 、 (E)-2-tert-Butoxycarbonylamino-4-((2S,3S,4R,5S,6R)-4,5-diacetoxy-6-acetoxymethyl-3-acetylamino-tetrahydro-pyran-2-yl)-but-2-enoic acid methyl ester