A new and efficient method for the facile synthesis of N-acyl sulfonamides under Lewis acid catalysis
作者:Chada Raji Reddy、Bodugam Mahipal、Srinivasa Rao Yaragorla
DOI:10.1016/j.tetlet.2007.08.048
日期:2007.10
sulfonamides with carboxylic acid anhydrides in the presence of Lewis acids is described. Several Lewis acids such as BF3·Et2O, ZnCl2, MoCl5, TiCl4, B(C6F5)3, Sc(OTf)3 and I2 were found to catalyze the reaction efficiently to furnish the N-acylated products in good yields under solvent-free conditions. The reactions of various sulfonamides were studied with different carboxylic acid anhydrides including the
描述了在路易斯酸存在下磺酰胺与羧酸酐的N-酰化。发现几种路易斯酸,例如BF 3 ·Et 2 O,ZnCl 2,MoCl 5,TiCl 4,B(C 6 F 5)3,Sc(OTf)3和I 2可以有效地催化反应以提供N-在无溶剂条件下,酰化产物的收率很高。在3 mol%ZnCl 2存在下,研究了各种磺酰胺与不同羧酸酐(包括反应性较低的苯甲酸酐和新戊酸酐)的反应作为催化剂。羧酸还通过混合酸酐法成功地用作酰化剂。