A method of preparing intermediates for carbapenem antibiotics characterized by treating a N-deprotected acetoxy conpound of the formula: ##STR1## in the presence of a Lewis acid or a silylating agent to yeild an intermediate; and cyclizing the intermediate in the presence of rhodium (II) acetate to form a bicyclic ketoester.
一种制备碳青霉烯类抗生素中间体的方法,其特征在于将式为:##STR1## 的去保护N-乙酰氧化合物在
路易斯酸或
硅烷化剂存在下处理,得到中间体;并在二
乙酸钿存在下使中间体环化,形成双环
酮酯。