The stereospecific cycloaddition of nitrogen containing acetic acid halides or anhydrides with Schiff bases having a carbalkoxy group substituted on the methine carbon atom offers new intermediates and methods for preparing synthetic cephalosporin congeners having antibacterial activity.
含有氮的
醋酸卤化物或酐与在次甲基碳原子上带有羧烷氧基团的希夫碱进行立体特异性环加成反应,为合成具有抗菌活性的
头孢菌素同类物提供了新的中间体和方法。