Difluoromethylenephosphobetaine (Ph3P+CF2CO2−, PDFA), a known difluorocarbene reagent, was found to be able to efficiently trifluoromethylate terminalalkynes in the presence of Cu(I) and potassium fluoride. The transformation proceeded smoothly to afford the corresponding trifluoromethylated acetylenes in moderate yields.
二氟亚甲基磷酸酯(PH 3 P + CF 2 CO 2 -,PDFA),一种已知的二氟卡宾的试剂,被认为是能够在铜(I)和氟化钾的存在下有效地trifluoromethylate末端炔。转化顺利进行,以中等收率得到相应的三氟甲基化乙炔。
Visible-Light-Mediated Deacylated Alkynylation of Unstrained Ketone
Deconstructive alkynylation of an unstrained ketone catalyzed by an organic photocatalyst under blue light irradiation is reported for the first time. A broad substrate scope with up to 63 examples, excellent functional group tolerance, and gram scale reaction demonstrated the practicality of this novel alkynylation method. The dihydroquinazolinone derivative of trifluoroacetophenone had been proved