Zn(II)-Catalyzed Selective <i>N</i>-Alkylation of Amines with Alcohols Using Redox Noninnocent Azo-Aromatic Ligand as Electron and Hydrogen Reservoir
作者:Subhajit Chakraborty、Rakesh Mondal、Subhasree Pal、Amit Kumar Guin、Lisa Roy、Nanda D. Paul
DOI:10.1021/acs.joc.2c01773
日期:2023.1.20
We report a sustainable and eco-friendly approach for selective N-alkylation of various amines by alcohols, catalyzed by a well-defined Zn(II)-catalyst, Zn(La)Cl2 (1a), bearing a tridentate arylazo scaffold. A total of 57 N-alkylated amines were prepared in good to excellent yields, out of which 17 examples are new. The Zn(II)-catalyst shows wide functional group tolerance, is compatible with the synthesis
我们报告了一种可持续且环保的方法,用于通过醇对各种胺进行选择性N-烷基化,由定义明确的 Zn(II)-催化剂 Zn( L a )Cl 2 ( 1a ) 催化,带有三齿芳基偶氮支架。总共制备了 57 种N-烷基化胺,收率从好到极好,其中 17 种是新的。Zn(II)-催化剂显示出广泛的官能团耐受性,与通过双N合成二烷基化胺相容-二胺的烷基化,并在克级反应中以高产率生产市售药物三苯甲胺和溴铵的前体。控制反应和 DFT 研究表明,在整个催化过程中,偶氮发色团发生电子转移事件,偶氮发色团在中性偶氮、单电子还原偶氮阴离子自由基和双电子还原偶氮形式之间穿梭,充当电子和氢储存器, 使 Zn(II)-催化剂用于N-烷基化反应。