A process for preparing 2-substituted 5-chloroimidazole-4-carbaldehydes of the general formula: ##STR1## In the process, a glycine ester hydrohalide is ring-closed with an imidate ester to obtain the intermediate 2-substituted 3,5-dihydroimidazol-4-one. This intermediate is converted with an N,N-substituted formamide acetal into an N,N-substituted aminomethyleneimidazolinone. This latter intermediate is chlorinated with phosphorus oxychloride or phosgene to obtain the final product 2-substituted 5-chlorimidazole-4-carbaldehydes of the general formula I. Also disclosed are N,N-substituted aminomethyleneimidazolinones of the general formula: ##STR2## wherein R is hydrogen or is an alkyl group, an alkenyl group, a cycloalkyl group, an arylalkyl group or an aryl group, and R.sub.5 and R.sub.6 are identical or different and each is an alkyl group or an aryl group, in the form of the E- or Z-isomer.
该过程用于制备一般式为:##STR1##的2-取代5-
氯咪唑-4-
甲醛。在该过程中,甘
氨酸酯氢卤化物与
咪唑酯环闭合,得到中间体2-取代3,5-二氢
咪唑-4-酮。将该中间体与N,N-取代甲酰胺
缩醛反应,得到N,N-取代
氨甲亚
咪唑酮。将后者与氧化
亚磷酸氯或
光气氯化,得到一般式I的最终产物2-取代5-
氯咪唑-4-
甲醛。还披露了一般式为:##STR2##的N,N-取代
氨甲亚
咪唑酮,其中R为氢或是烷基、烯基、环烷基、芳基烷基或芳基,R.sub.5和R.sub.6相同或不同,且各自为烷基或芳基,呈E-或Z-异构体形式。