The C=C Bond Decomposition Initiated by Enamine‐Azide Cycloaddition for Catalyst‐ and Additive‐Free Synthesis of
<i>N</i>
‐Sulfonyl Amidines
作者:Xixi Zheng、Jie‐Ping Wan
DOI:10.1002/adsc.201901054
日期:2019.12.17
The chemo‐selective synthesis of N‐sulfonyl amidines is realized via the decomposition of the enamine C=C bond of enaminoesters through an in situ generated triazoline intermediate. Control experiments prove that the electron withdrawing ester group in the enamine component is crucial in inducing the chemo‐selective formation of amidines. The method is featured with high efficiency and sustainability
<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.
A direct de-tetra-hydrogenative cross-coupling reaction between Csp3–H bonds and sulfamide under transition-metal-free conditions is reported to give the corresponding amidines.