Sunlight-driven trifluoromethylation of olefinic substrates by photoredox catalysis: A green organic process
作者:Munetaka Akita、Takashi Koike
DOI:10.1016/j.crci.2015.01.013
日期:2015.7
types of catalytic photoredox processes following the reductive quenching cycle (RQC) and the oxidative quenching cycle (OQC), the discussion is focused on organic transformations based on OQC, in particular the trifluoromethylation of olefinic substrates with electrophilic trifluoromethylating reagents furnishing solvolytic addition products and substitution products. It is concluded that catalytic
Synergistic Lewis Acid and Photoredox-Catalyzed Trifluoromethylative Difunctionalization of Alkenes with Selenium Ylide-Based Trifluoromethylating Reagent
radical source in the presence of a synergistic catalyst including a Lewisacidscandium(III) trifluoromethanesulfonate (Sc(OTf)3) and a photoredox catalyst [fac-Ir(ppy)3] was described. Mechanistic studies showed that the role of Sc(OTf)3 in the reaction is to activate reagent 1 via Lewis acid–Lewis base interaction to form complex [Sc(OTf)3•3(1)], which was fully characterized by nuclear magnetic resonance
Copper-Mediated Radical 1,2-Bis(trifluoromethylation) of Alkenes with Sodium Trifluoromethanesulfinate
作者:Bin Yang、Xiu-Hua Xu、Feng-Ling Qing
DOI:10.1021/acs.orglett.5b00601
日期:2015.4.17
An efficient chemoselective 1,2-bis(trifluoromethylation) of alkenes with CF3SO2Na promoted by t-BuOOH/CuCl was developed. This protocol provided the first convenient preparation of 1,2-bis(trifluoromethylated) compounds by the vicinal difunctionalization of alkenes. The chemoselectivity of this reaction was accomplished by increasing the concentration of the CF3 radical.
开发了由t- BuOOH / CuCl促进的具有CF 3 SO 2 Na的烯烃的高效化学选择性1,2-双(三氟甲基化)烯烃。该方案通过烯烃的邻位双官能化提供了第一种方便的1,2-双(三氟甲基化)化合物的制备方法。该反应的化学选择性通过增加CF 3基的浓度来实现。
Rational Design and Development of<scp>Low‐Price</scp>, Scalable,<scp>Shelf‐Stable</scp>and Broadly Applicable Electrophilic Sulfonium<scp>Ylide‐Based</scp>Trifluoromethylating Reagents
reagents (trifluoromethyl)(4-nitrophenyl)bis(carbomethoxy)methylide (1g) and (trifluoromethyl)(3-chlorophenyl)bis(carbomethoxy)methylide (1j) through structure-activity study was described. Under mild conditions, reagent 1g reacted with β-ketoesters and silyl enol ethers to give α-trifluoromethylated-β-ketoesters or α-trifluoromethylated ketones in high yields. In addition, reagent 1g could serve as
Oxytrifluoromethylation of multiple bonds using copper catalyst under mild conditions
作者:Hiromichi Egami、Ryo Shimizu、Mikiko Sodeoka
DOI:10.1016/j.tetlet.2012.07.134
日期:2012.10
Oxytrifluoromethylation reaction of styrene derivatives and alkynes with external and internal oxygen nucleophiles, catalyzed by copper (I) salts under mild conditions, was developed. Direct formation of a β-trifluoromethylstyrene derivative from a styrene derivative was also achieved by the reaction in the presence of a Brønsted acid. Further transformation of the oxytrifluoromethylated products was