The authors thank the National Natural Science Foundation of China(NSFC)(Nos.21032006,21172240);the 973 Program of China(No.2012CBA01200);the Chinese Academy of Sciences for financial support.
Difluoromethylene phosphobetaine(Ph_(3)P^(+)CF_(2)CO_(2)^(-),PDFA),a known difluorocarbene reagent,was found to be able to efficiently trifluoromethylate terminal alkynes in the presence of Cu(I)and potassium fluoride...