Selective Hofmann alkylation of aromatic-aliphatic diamines in the presence of carbon dioxide
作者:Alexei G. Balybin、Yuri M. Panov、Ludmila V. Erkhova、Dmitry A. Lemenovskii、Dmitry P. Krut’ko
DOI:10.1016/j.mencom.2019.07.028
日期:2019.7
Selective Hofmann alkylation at arylamino group in carbon dioxide medium was demonstrated on model diamines containing aliphatic and aromatic primary amino groups, namely, 2-H2NC6H4CH2NH2, 3-H2NC6H4CH(Me)NH2, and 4-H2NC6H4CH2CH2NH2. Depending on the spatial factors, di- or trialkylarylammonium derivatives are selectively formed in amide solvents (DMF, DMA) without additional base.
在含有脂族和芳族伯氨基的模型二胺上,即2-H2NC6H4CH2NH2、3-H2NC6H4CH(Me)NH2和4-H2NC6H4CH2CH2NH2,在二氧化碳介质中的芳基氨基上进行了选择性霍夫曼烷基化反应。根据空间因素,在酰胺溶剂(DMF,DMA)中无需额外的碱就可以选择性地形成二烷基或三烷基芳基铵衍生物。