A process for preparing an azetidinone of the formula: ##STR1## which comprises reacting a C-unsubstituted methyleneamine of the formula: ##STR2## with R.sup.2 --CH.sub.2 COOH, its acid halide or anhydride, in the presence of boron trihalide and an organic base, wherein R.sup.1 is an organic residue bearing a carboxy group or its derivative and R.sup.2 is azido, substituted amino, halogen, acyloxy, alkoxy, aryloxy or aralkoxy.
制备公式为:##STR1##的氮杂环
丙酮的方法,包括在
硼三卤化物和有机碱的存在下,将公式为:##STR2##的C-未取代亚甲基胺与R.sup.2 --CH.sub.2 COOH、其酸卤或酐反应,其中R.sup.1是带有羧基或其衍
生物的有机残基,R.sup.2是
叠氮基、取代
氨基、卤素、酰氧基、烷氧基、芳氧基或芳基氧基。