(6R-trans)-7-amino-3-[[[3,4-bis-(acetyloxy)benzoyl]oxy]methyl]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 1,1-dimethylethyl ester monohydrochloride 以
S-2-benzothiazolyl 2-amino-alpha-[(Z)-[1-(tertbutoxycarbonyl)-1-methylethoxy]imino]thio-4-thiazole acetate 、
正己烷 、
二氯甲烷 、
乙酸乙酯 为溶剂,
以1.16 g (77%)的产率得到[6R-[6 alpha,7 beta(Z)]]-3-[[[3,4-bis(acetyloxy)benzoyl]oxy]-methyl]-7-[[[(2-amino-4-thiazolyl)[1,1-dimethyl-2-(1,1-dimethylethoxy)-2-oxoethoxy]imino]acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 1,1-dimethylethyl ester