Amidines. VII. Hydrolysis and alcoholysis of carboxamides under mild conditions.
作者:Machiko ONO、Ichiro ARAYA、Reiko TODOROKI、Shinzo TAMURA
DOI:10.1248/cpb.38.1824
日期:——
Hydrolysis and alcoholysis of carboxamides derived from primary aliphatic amines were achieved under mild conditions. Amide exchange reaction between carboxamides and N1-acyl-N1, N2-di (p-nitrophenyl) formamidines (1) gave N1-acyl-N1-alkyl-N2-(p-nitrophenyl)formamidines (2) which were readily hydrolyzed or alcoholyzed to give N1-alkyl-N2-(p-nitrophenyl)formamidines (4) and carboxylic acid or its ester. Compounds 4 were hydrolyzed to give aliphatic amine and N-formyl-p-nitroaniline in the presence of acetic acid or hydrochloric acid at room temperature. For the alcoholysis of N-acyl derivatives of amino alcohols, protection of the hydroxyl substituent by an acyl group was essential because the reaction of 1 and N-acyl derivatives of amino alcohols was quite complex. Alcoholysis of N-ethyl-N, N'-ethylenebis (p-chlorobenzamide) (8a) by this method gave N-(2-aminoethyl)-N-ethyl-p-chlorobenzamide (8b). Thus, the selective alcoholysis of diacyl derivative of diamines, which contain primary and secondary amino groups, was achieved.
在温和条件下,实现了由伯脂肪胺衍生的羧酰胺的水解和醇解。羧酰胺与N1-酰基-N1,N2-二(对硝基苯基)甲酰亚胺(1)之间的酰胺交换反应产生了N1-酰基-N1-烷基-N2-(对硝基苯基)甲酰亚胺(2),这些化合物容易发生水解或醇解,生成N1-烷基-N2-(对硝基苯基)甲酰亚胺(4)和羧酸或其酯。化合物4在乙酸或盐酸存在下室温水解,产生脂肪胺和N-甲酰基-对硝基苯胺。对于氨基醇的N-酰基衍生物的醇解,通过酰基保护羟基取代基是必要的,因为1与氨基醇的N-酰基衍生物的反应非常复杂。通过这种方法,N-乙基-N,N'-乙烯基双(对氯苯甲酰胺)(8a)的醇解生成了N-(2-氨基乙基)-N-乙基-对氯苯甲酰胺(8b)。这样,实现了含有伯和仲氨基的二胺二酰基衍生物的选择性醇解。