Synthesis of new α,α-difluoro-γ-lactones through intramolecular radical cyclization as a key reaction
作者:Toshiyuki Itoh、Hiroyuki Ohara、Sachie Emoto
DOI:10.1016/0040-4039(95)00518-h
日期:1995.5
Carbon radicals from allyl o-trimethylsilyl-alpha-bromo-alpha,alpha-difluoroacetals can cyclize onto olefines regiospecifically to give gamma-lactols in good yield. These lactols have been converted to the corresponding alpha,alpha-difluoro-gamma-lactones. The first synthesis of three new alpha,alpha-difluoro-gamma-lactones has been accomplished.
Systematic Synthesis of Multifluorinated α,α-Difluoro-γ-lactones through Intramolecular Radical Cyclization
orbital of alpha,alpha-difluoroacetyl radical occurred; this caused unsuccessful cyclization. To apply the present radical reaction, the first synthesis of both enantiomers of difluoroeldanolide, analogues of the sex pheromone of the male African sugarcaneborer, has been demonstrated. Electrophysiological tests revealed that the difluorinated analogues were as active as the natural eldanolide on the