gem-Difluorosubstituted NH-azomethine ylides in the synthesis of 4-fluorooxazolines via the three-component reaction of imines, trifluoroacetophenones and CF2Br2
作者:Kirill A. Khistiaev、Mikhail S. Novikov、Alexander F. Khlebnikov、Joerg Magull
DOI:10.1016/j.tetlet.2007.12.037
日期:2008.2
A simple one-step synthesis of a new class of fluorinated heterocycles, 4-fluoro-3-oxazolines, from diarylmethanimines, trifluoroacetophenones and CF2Br2 is described. The reaction proceeds via the sequential formation of difluorocarbene and a gem-difluorosubstituted NH-azomethine ylide, followed by 1,3-dipolar cycloaddition with a ketone.