作者:Zheng Wang、Robert D. Barrows、Thomas J. Emge、Spencer Knapp
DOI:10.1021/acs.oprd.7b00046
日期:2017.3.17
Propanephosphonic acid anhydride (T3P) is a process-friendly commercial reagent that is useful for direct carboxamide formation from the carboxylic acid and amine components. For amidation reactions of certain tetrahydroisoquinolonic carboxylic acids and electron-poor anilines, the phosphonate carboxylate mixed anhydride intermediate evidently eliminates under basic conditions to give a ketene, whose
丙膦酸酐(T3P)是一种易处理的商业试剂,可用于由羧酸和胺成分直接形成羧酰胺。对于某些四氢异喹啉代羧酸和贫电子苯胺的酰胺化反应,膦酸酯羧酸盐混合酸酐中间体在碱性条件下明显消除,得到乙烯酮,其加成反应又导致非对映异构酰胺产物的混合物。例如,用作碱的1,4-二氮杂双环[2,2,2]辛烷主要提供3,4-顺式产物,而N-甲基咪唑可有效地产生3,4-反式产物。提供了机理学原理以及有关中间烯酮的令人信服的证据,以及有效的T3P介导的羧酰胺作为活性抗疟疾药物的有效制备方法的几个实例。