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
It is shown here for the first time that diethyl azodicarboxylate promotes dehydrogenation of tertiaryamines to afford enamines, which subsequently take place in tandem reactions with sulfonyl azides to give the N-sulfonyl amidine derivatives. A number of different substituted tertiaryamines and sulfonyl azides can successfully be coupled, and several functionalized groups are tolerated in this system. The reaction described here is mild, general, and efficient, thus providing an extremely preferable method for synthesis of a variety of N-sulfonyl amidine derivatives.
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