Water-removable ynamide coupling reagent for racemization-free syntheses of peptides, amides, and esters
作者:Tao Liu、Xue Zhang、Zejun Peng、Junfeng Zhao
DOI:10.1039/d1gc03498g
日期:——
A novel ynamide coupling reagent, the by-product of which can be removed by water, was reported. It promotes the direct coupling between carboxylic acids and amines, alcohols or thiols to provide amides, peptides, esters and thioesters, respectively. No detectable racemization was observed for all the coupling reactions of carboxylic acids containing an α-chiral center. Importantly, a simple acidic
报道了一种新型 ynamide 偶联剂,其副产物可以通过水去除。它促进羧酸与胺、醇或硫醇之间的直接偶联,分别提供酰胺、肽、酯和硫酯。对于含有α-手性中心的羧酸的所有偶联反应,均未观察到可检测的外消旋化。重要的是,简单的酸性水溶液后处理很容易去除副产物,无需使用柱色谱即可获得产率良好至极好的纯偶联产物,从而使该方法更加环保、用户友好且更具成本效益。卡非佐米的外消旋化/无差向异构化合成进一步证明了可去除水的 ynamide 偶联试剂的稳健性,