A general route for the synthesis of β,β-difluorocarboxylic acids
作者:Or Cohen、Shlomo Rozen
DOI:10.1016/j.tet.2008.03.018
日期:2008.5
A new method for the preparation of β,β-difluoro- (and other gem-difluoro) acids has been developed. It is based on the fact that 3-oxocarboxylic esters are easy to make and convert to the corresponding dithiane derivatives. These dithianes reacted with BrF3, a commercial, but rarely used reagent in organic chemistry, under very mild conditions to form the corresponding difluoroesters, which in turn
Abstract The preparation of the dione 3 from ethyl-1,3-acetonedicarboxylate (11) is described. Its condensation with various aniline derivatives has been studied. The arylenaminoketone 5b was photocyclized and converted into the new carbazole 8.