(2,2-Dimethyl-1,3-dioxolan-4-yl)methyl 1-iodoethyl carbonate 、 7-{2-(5-amino-[1,2,4]thiadiazol-3-yl)-2-[(Z)-fluoromethoxyimino]-acetylamino}-3-formyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid sodium salt 、 在
乙酸乙酯 、
disodium;carbonate 、 Brine 、
乙醚 作用下,
以
N,N-二甲基乙酰胺 为溶剂,
以7-{2-(5-Amino-[1,2,4]thiadiazol-3-yl)-2-(fluoromethoxyimino)-acetylamino}-3-formyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 1-(2,2-dimethyl-[1,3]dioxolan-4-yl-methoxycarbonyloxy)-ethyl ester is obtained的产率得到7-{2-(5-Amino-[1,2,4]thiadiazol-3-yl)-2-(fluoro-methoxyimino)-acetylamino}-3-formyl-8-oxo-5-thia-1-aza-bicyclo[4.2.0]oct-2-ene-2-carboxylic acid 1-(2,2-dimethyl-[1,3]dioxolan-4-ylmethoxycarbonyloxy)-ethyl ester