<i>N</i>-Sulfonyl acetylketenimine as a highly reactive intermediate for the synthesis of <i>N</i>-sulfonyl amidines
作者:Weiguang Yang、Dayun Huang、Xiaobao Zeng、Dongping Luo、Xinyan Wang、Yuefei Hu
DOI:10.1039/c8cc04699a
日期:——
A highly reactive intermediate N-sulfonyl acetylketenimine was generated from a 3-butyn-2-one participating CuAAC/ring-opening method. Its high reactivity due to bearing two EWGs allowed us to offer the first example of a reaction between ketenimine and amide to synthesize N-sulfonyl amidines efficiently.
Metal-Free Direct Access to<i>N</i>-Sulfonyl Amidines from Sulfonamides and Secondary Amines Involving Tandem C–N Bond Formations
作者:Chandra Shekhar Nishad、Krishna Kanta Haldar、Biplab Banerjee
DOI:10.1021/acs.joc.2c01292
日期:2022.9.2
We report a mild and efficient metal-free one-pot procedure for the synthesis of N-sulfonyl amidines via the direct reaction of sulfonamides with secondaryamines without using any additives. A wide range of substrates with variety of functional groups is well tolerated under the reaction conditions. Preliminary mechanistic studies indicate that the secondaryamine plays a dual role as a C1 source