1,3-Dipolar cycloaddition of nitrones with 1,1-difluoroolefins gives rise to fluorinated isoxazolidines in 85% yield; subsequent Raney nickel reduction of the cycloadducts produces beta-lactams.
Electrophilic addition reactions of 1,1-difluoro-2,2-diphenylthioethylene
作者:Suzanne T. Purrington、Kuen-Wanq Sheu
DOI:10.1016/s0022-1139(00)80490-x
日期:1993.11
Electrophiles have been shown to add to F2CC(SPh)2 at the difluoromethylene carbon, indicating that sulfur is better able to stabilize a positive charge than fluorine.