[2-(4-tert-Butoxycarbonylamino-3-oxo-pyrazolidin-1-yl)-1-methanesulfonyl-ethyl]-phosphonic acid dimethyl ester 在
N,N-二异丙基乙胺 作用下,
以
二氯甲烷 为溶剂,
生成 (S)-6-{2-(2-Allyloxycarbonylamino-thiazol-4-yl)-2-[(Z)-methoxyimino]-acetylamino}-2-methanesulfonyl-7-oxo-6,7-dihydro-3H,5H-pyrazolo[1,2-a]pyrazole-1-carboxylic acid allyl ester