Synthesis of 2-[(Arylmethylene)amino]cyclopropanecarbonitriles via a Two-Step Ring Transformation of 2-(Cyanomethyl)aziridines
作者:Norbert De Kimpe、Sven Mangelinckx、Matthias D’hooghe、Sietske Peeters
DOI:10.1055/s-0028-1088000
日期:2009.4
Reaction of 2-(cyanomethyl)aziridines with N-bromosuccinimide in dichloromethane results in the formation of 3-[(arylmethylene)amino]-4-bromobutanenitriles in high yield. The latter β-amino-γ-bromobutanenitriles were converted into separable trans- and cis-2-[(arylmethylene)amino]cyclopropanecarbonitriles through a 1,3-cyclization by reaction with potassium tert-butoxide, thus culminating in a two-step ring transformation of 2-(cyanomethyl)aziridines into 2-[(arylmethylene)amino]cyclopropanecarbonitriles.
2-(氰基甲基)氮杂环丁烯与N-溴琥珀酰亚胺在二氯甲烷中的反应生成高收率的3-[(芳烯基)氨基]-4-溴丁腈。后者的β-氨基-γ-溴丁腈通过与醋酸钾的反应进行1,3-环化,转化为可分离的反式和顺式2-[(芳烯基)氨基]环丙烷碳腈,从而完成了2-(氰基甲基)氮杂环丁烯到2-[(芳烯基)氨基]环丙烷碳腈的两步环转化。