A catalyst‐free, charge‐transfer complex promoted coupling of sulfonyl chlorides with vicinal tertiary diamines to generate sulfonamides is presented. Mechanistic studies showed that these reactions are proceeded via charge transfer of vicinal tertiary diamines to sulfonyl chlorides, forming the unstable sulfonyl quaternary ammonium like complexes which induced the regiospecific intramolecular C−N bond cleavage of vicinal tertiary diamines.

中文翻译：

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电荷转移复合物促进了叔叔二胺的区域特异性C-N键裂解。

提出了一种无催化剂，电荷转移的复合物，可促进磺酰氯与邻位叔二胺的偶联，从而生成磺酰胺。机理研究表明，这些反应是通过将邻位叔二胺电荷转移至磺酰氯而进行的，形成了不稳定的磺酰基季铵盐状复合物，从而诱导了邻位叔二胺的区域特异性分子内C-N键裂解。