Аннотация:
Ionic liquids facilitate regio- and stereoselective [3 + 2] cycloaddition of 1-hetaryl-2-nitroethenes to azomethine imines generated catalytically from 6-Ar-1,5-diazabicyclo[3.1.0]hexanes in the presence of BF3 Et2O. The similar reaction is possible in MeCN only for azomethine imine with Ar = 2,4-(MeO)2C6H3 to give a mixture of two diastereomers.