1,3-dipolar cycloaddition of fluorinated azomethine ylides at the C=N bond
作者:M. S. Novikov、A. F. Khlebnikov、M. A. Egarmin、J. Kopf、R. R. Kostikov
DOI:10.1007/s11178-005-0048-7
日期:2004.10
Azomethine ylides generated by reaction of difluorocarbene with N-alkyl- and N-arylimines derived from benzaldehyde and benzophenone react with N-benzylidenebenzenesulfonamide in a regioselective fashion, yielding the corresponding imidazolidin-4-ones via 1,3-dipolar cycloaddition at the C=N bond. Ylides generated from benzaldehyde imines give rise to mixtures of stereoisomeric 2,5-diphenyl-1-(phenylsulfonyl)-imidazolidin-4-ones, the cis isomer prevailing.