申请人:Takeda Chemical Industries, Ltd.
公开号:US04845257A1
公开(公告)日:1989-07-04
A method of producing a 4-halo-2-(substituted or unsubstituted)hydroxyimino-3-oxobutyric acid ester or amide, which is a synthetic intermediate of value for the production of cephalosporins containing an aminothiazole group, characterized by reacting a 2-(substituted or unsubstituted)-hydroxyimino-3-oxobutyric acid or an ester or amide thereof with a silylating agent and reacting the resulting novel 2-(substituted)hydroxyimino-3-silyloxy-3-butenoic acid ester or amide with a halogenating agent.
一种制备4-卤代-2-(取代或未取代)羟基亚胺-3-酮丁酸酯或酰胺的方法,该方法是制备含有氨基噻唑基团头孢菌素的合成中间体,其特征在于将2-(取代或未取代)羟基亚胺-3-酮丁酸或其酯或酰胺与硅烷化试剂反应,并将所得的新型2-(取代)羟基亚胺-3-硅氧基-3-丁烯酸酯或酰胺与卤代试剂反应。