The trifluoromethylation of benzoic acids with TMSCF3 was achieved through nucleophilic substitution with the use of anhydrides as an in situ activating reagent. Under the reaction conditions, a wide range of carboxylic acids including the bioactive ones worked well, thus providing a facile and efficient method for preparing aryl trifluoromethyl ketones from the readily available starting materials
A two-step process for the synthesis of aryl and heteroaryl trifluoromethyl ketones from the corresponding aldehydes is described. Trifluoromethyl alcohols were prepared from aryl and heteroaryl aldehydes in excellent yields using catalytic amount of K2CO3. The trifluoromethyl alcohols were then oxidized conveniently and efficiently by o-iodoxybenzoic acid (IBX) under mild conditions to get the desired
描述了由相应的醛合成芳基和杂芳基三氟甲基酮的两步法。使用催化量的K 2 CO 3由芳基和杂芳基醛以极好的收率制备三氟甲醇。然后在温和的条件下,通过邻碘氧苯甲酸(IBX)方便有效地氧化三氟甲醇,得到所需的官能化芳基和杂芳基三氟甲基酮。
NHC-Copper(I) Halide-Catalyzed Direct Alkynylation of Trifluoromethyl Ketones on Water
Br, I, OAc, OTf) complexes, providing tertiary propargylic trifluoromethyl alcohols in high yields and with excellent chemoselectivity from a broad range of aryl‐ and more challenging alkyl‐substituted trifluoromethyl ketones (TFMKs). DFT calculations were performed to rationalize the correlation between the yield of catalytic alkynylation and the sterics of N‐heterocycliccarbenes (NHCs), expressed
Visible light-promoted umpolung coupling of aryl tri-/difluoroethanones with 2-alkenylpyridines
作者:Xiao Xu、Qing-Qiang Min、Na Li、Feng Liu
DOI:10.1039/c8cc06748a
日期:——
Tertiaryalcohols bearing a trifluoromethyl group are of considerable medicinal interest. Using an umpolung strategy, we herein report the first intermolecular reductive cross-coupling of aryl tri-/difluoroethanones with 2-alkenylpyridines with the aid of a Brønsted acid catalyst upon visible-light irradiation. This metal-free reaction is operationally simple and performed at ambient temperature, allowing
Copper-Mediated Trifluoroacetylation of Arenediazonium Salts with Ethyl Trifluoropyruvate
作者:Wei Wu、Qinli Tian、Taotao Chen、Zhiqiang Weng
DOI:10.1002/chem.201604300
日期:2016.11.7
A copper‐mediated trifluoroacetylation of various arenediazoniumsalts with ethyl trifluoropyruvate is reported. The reaction proceeded smoothly under mild conditions at room temperature giving trifluoromethyl aryl ketones in moderate to good yields. A variety of functional groups, including methoxy, hydroxy, ester, ketone, trifluoromethyl, and halide groups, were well tolerated. A possible reaction