作者:Adolfo Le Pera、Antonella Leggio、Angelo Liguori
DOI:10.1016/j.tet.2006.03.104
日期:2006.6
A synthetic methodology for the specific conversion of primary aromatic amines into their N-monomethyl derivatives under very mild conditions is presented. Anilines are treated with 4-nitrobenzenesulfonyl (nosyl) chloride to generate the corresponding sulfonamides 2 in high yields. The subsequent N-methylation reaction of the sulfonamides 2 with a solution of diazomethane is rapid and quantitative
提出了一种在非常温和的条件下将芳族伯胺具体转化为N-单甲基衍生物的合成方法。用4-硝基苯磺酰(壬基)氯化物处理苯胺,以高产率产生相应的磺酰胺2。磺酰胺2与重氮甲烷溶液的随后N-甲基化反应是快速且定量的。使用试剂体系巯基乙酸/ 1,8-二氮杂双环[5.4.0]十一碳-7-烯(DBU)可以轻松进行烷基保护基的除去,得到N-单甲基化的芳族胺4。该程序方便,高效,并产生了N-一甲基苯胺。