Synthesis of benzamide-benzothiazole conjugates via palladium-catalysed aminocarbonylation (hydrazinocarbonylation)
作者:Máté Gergely、László Kollár
DOI:10.1016/j.tet.2019.02.026
日期:2019.3
The palladium-catalysed aminocarbonylation of iodoarenes was investigated using 2-amino- and 2-hydrazinobenzothiazole as N-nucleophile. The reaction proved to be highly chemoselective in all cases: carboxamides and the corresponding carbohydrazides, obtained by the acylation at the nitrogen adjacent to the C-2 of the benzothiazole moiety, were obtained exclusively and isolated in moderate to high yields
使用2-氨基和2-肼基苯并噻唑作为N-亲核试剂,研究了钯催化的碘代芳烃的氨基羰基化。该反应在所有情况下均具有高度的化学选择性:仅获得苯甲酰胺和相应的碳酰肼,它们是通过在与苯并噻唑部分的C-2相邻的氮原子处进行酰化而获得的,并以中等至高收率分离。对反应条件的系统研究表明,该反应需要相对较高的温度(高于70°C)。两种产品的合成中一氧化碳压力的影响是不同的:尽管有利于羧酰胺的形成,但随着CO压力的增加,碳酰肼的形成降低。