Activation of carboxylic acids as their active esters by means of tert-butyl 3-(3,4-dihydrobenzotriazine-4-on)yl carbonate
作者:Yochai Basel、Alfred Hassner
DOI:10.1016/s0040-4039(02)00324-6
日期:2002.4
Carboxylic acids were activated in the presence of DMAP with tert-butyl carbonates (BOC-OX) 1, which were prepared in situ by reaction of X-OH and di-tert-butyl dicarbonate (BOC2O). The most efficient active carbonate proved to be tert-butyl 3-(3,4-dihydrobenzotriazine-4-on)yl carbonate 1a, leading to efficient formation of benzotriazinonyl esters 3 and 6, which are intermediates in reactions with primary
羧酸是在DMAP的存在下与活化的叔丁基碳酸酯(BOC-OX)1,将其在原位X-OH和二-的反应而制备叔丁基酯(BOC 2 O)。事实证明,最有效的活性碳酸酯是碳酸3-(3,4-二氢苯并三嗪-4-on)叔丁基酯1a,可有效形成苯并三嗪壬酸酯3和6,它们是与伯胺和仲胺反应生成的中间体。以高收率得到酰胺或肽。形成3或6的副产物是对环境安全的叔丁醇( BuOH)和一氧化碳(CO)2。受阻氨基酸AIB也以良好的产率形成二肽。