Direct Acyl Substitution of Carboxylic Acids: A Chemoselective O- to N-Acyl Migration in the Traceless Staudinger Ligation
作者:Andrew D. Kosal、Erin E. Wilson、Brandon L. Ashfeld
DOI:10.1002/chem.201201773
日期:2012.11.5
chlorophosphite‐modified, Staudinger‐like acylation of azides involving a highly chemoselective, direct nucleophilic acyl substitution of carboxylic acids is described. The reaction provides the corresponding amides with analytical purity in 32–97 % yield after a simple aqueous workup without the need for a pre‐activation step. The use of chlorophosphites as dual carboxylic acid–azide activating agents
描述了叠氮化物的氯亚磷酸酯修饰的,类似于Staudinger的酰化反应,涉及羧酸的高度化学选择性,直接亲核酰基取代。在简单的水溶液处理后,该反应可提供相应的分析纯度的酰胺,产率为32–97%,而无需预活化步骤。在多种亲核和亲电官能团(包括胺,醇,酰胺,醛和酮)的存在下,使用氯代亚磷酸酯作为双羧酸-叠氮化物活化剂可以形成酰基CN键。描述了用于形成烷基酰胺,磺酰基酰胺,内酰胺和二肽的羧酸和叠氮化物的偶联。