A process for preparing azomethines of the general formula (V) where R is an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted alkyl radical or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms, and R1 is an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms, R2 is hydrogen or an optionally substituted carbocyclic aromatic radical having 6 to 24 carbon atoms or an optionally substituted alkyl radical or an optionally substituted cycloalkyl radical or an optionally substituted heteroaromatic radical having 5 to 24 carbon atoms by reacting alpha-oxo carboxylates of the general formula (I) where n is a number in the range from 1 to 6, M(n+) is a cation, with aryl bromides of the general formula (IV) and amines of the general formula (II) via the alpha-iminocarboxylate intermediate of the general formula (III), in the presence of two transition metals or compounds thereof as catalyst, is described.
一种制备一般式(V)中的
偶氮甲烷的方法,其中R是一个可选择取代的含有6到24个碳原子的碳环芳香基团或一个可选择取代的烷基基团或一个可选择取代的含有5到24个碳原子的杂芳基团,R1是一个可选择取代的含有6到24个碳原子的碳环芳香基团或一个可选择取代的含有5到24个碳原子的杂芳基团,R2是氢或一个可选择取代的含有6到24个碳原子的碳环芳香基团或一个可选择取代的烷基基团或一个可选择取代的环烷基基团或一个可选择取代的含有5到24个碳原子的杂芳基团,通过将一般式(I)中的α-氧代
羧酸酯(其中n是1到6范围内的数字,M(n+)是一个阳离子)与一般式(IV)的芳基
溴化物和一般式(II)的胺在两个过渡
金属或其化合物存在的催化剂的作用下,通过一般式(III)的α-
亚胺羧酸酯中间体的反应来实现。