N-hydroxypyridine-2(1H)-thione derivatives of carboxylic acids as activated esters. Part I. The synthesis of carboxamides
作者:Derek H.R. Barton、J. Albert Ferreira
DOI:10.1016/0040-4020(96)00487-5
日期:1996.7
The reaction between an acyl derivative of N-hydroxypyridine-2(1H)-thione (a Barton PTOC ester) and either an amine (primary or secondary), or the corresponding sulfenamide, led to the formation of a carboxamide in a clean transformation requiring minimal work-up and purification. The reaction with a sulfenamide is particularly useful since the only by-product, an unsymmetrical disulfide, is of both
N-羟基吡啶-2(1 H)-硫酮的酰基衍生物(Barton PTOC酯)与胺(伯或仲)或相应的亚磺酰胺之间的反应导致在纯净转化中形成羧酰胺需要最少的后处理和纯化。与亚磺酰胺的反应特别有用,因为唯一的副产物非对称二硫化物具有合成和生物学价值。在空间要求严格的情况下,Barton PTOC酯对苯磺酰胺的反应性强于对相应的游离胺的反应性。