Selective Monoacylation of Symmetrical Diamines via Prior Complexation with Boron
作者:Zhongxing Zhang、Zhiwei Yin、Nicholas A. Meanwell、John F. Kadow、Tao Wang
DOI:10.1021/ol0300773
日期:2003.9.1
[reaction: see text] Pretreatment of a symmetrical primary or secondary diamine with 9-BBN prior to the addition of an acyl chloride significantly suppressed undesired diacylation, and the product of monoacylation predominated. The reactive preference is interpreted as the result of a selective deactivation of one nitrogen atom of the diamine by 9-BBN.
s-Triazene based fluorous coupling reagent for direct amide synthesis
作者:Shrawan Kumar Mangawa、Sangram Keshari Bagh、Kumkum Sharma、Satish K. Awasthi
DOI:10.1016/j.tetlet.2015.02.078
日期:2015.4
A new simple and efficient fluorous coupling reagent TriTFET (2,4,6-tris-(2,2,2-trifluoro-ethoxy)-[1,3,5] triazene) has been designed and synthesized for the direct amidation. The use of 5 mol % of TriTFET is good for the amide synthesis from carboxylic acids with amines in moderate to excellent yields (72-96%). (C) 2015 Elsevier Ltd. All rights reserved.