Copper-Mediated Aerobic Oxidative Trifluoromethylation of Terminal Alkynes with Me<sub>3</sub>SiCF<sub>3</sub>
作者:Lingling Chu、Feng-Ling Qing
DOI:10.1021/ja102175w
日期:2010.6.2
An efficient copper-mediated trifluoromethylation of terminalalkynes with nucleophilic trifluoromethylating reagent (Me(3)SiCF(3)) was developed. Both aromatic alkynes and aliphatic alkynes were effective, and a variety of functionalities such as amino, -OMe, -CO(2)Et, -Br, and -NO(2) were tolerated under the reaction conditions. This reaction provides a general, straightforward, and practically useful
Two practical and complementary methods are reported for the synthesis of trifluoromethylated alkynes. The first one, a mix‐and‐stir process, is based on the oxidative trifluoromethylation of readily available and bench‐stable copper acetylides while the second one, which displays a broad substrate scope and has several advantages over existing procedures, is based on the oxidativecopper‐catalyzed
An improved method for the efficient copper-mediated trifluoromethylation of terminalalkynes has been developed. This protocol highlights the convenient access to a variety of aryl-substituted trifluoromethylated alkynes by oxidativetrifluoromethylation with two equivalents of TMSCF3 at room temperature.
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。
Copper-Catalyzed Oxidative Trifluoromethylation of Terminal Alkynes and Aryl Boronic Acids Using (Trifluoromethyl)trimethylsilane
作者:Xueliang Jiang、Lingling Chu、Feng-Ling Qing
DOI:10.1021/jo202566h
日期:2012.2.3
copper-mediated oxidative trifluomethylation of terminalalkynes and aryl boronic acids. This method allows a wide range of functional group tolerant trifluoromethylated acetylenes and arenes to be easily prepared. After the preliminary mechanistic studies of the oxidativetrifluoromethylation of terminalalkyne, an efficient copper-catalyzed oxidativetrifluoromethylation of terminalalkynes and aryl boronic