A metal‐free approach for the synthesis of 5‐trifluoromethyl‐1,2,4‐triazoles from trifluoroacetimidoyl chlorides and hydrazones has been achieved under aerobic oxidative conditions. The reaction proceeds through a cascade base‐promoted intermolecular C−N bond formation and iodine‐mediated intramolecular C−N bond oxidative coupling sequence. The protocol features broad substrate scope and can be scaled
Cu-catalyzed tandem reactions of fluorinated alkynes with sulfonyl azides en route to 2-trifluoromethylquinolines
作者:Yajun Li、Lisi Zhang、Li Zhang、Yongming Wu、Yuefa Gong
DOI:10.1039/c3ob41658e
日期:——
A novel method for the synthesis of 2-trifluoromethylquinolines via Cu-catalyzed tandem reactions was reported. A strong electronic effect was observed, but the steric effect was negligible.
e annulation reaction for the efficient construction of 2-(trifluoromethyl)quinazolin-4(3H)-ones has been developed. This transformation employs readily available isatins and trifluoroacetimidoyl chlorides as the starting materials, providing a facile and practical route to diverse biologically relevant quinazolin-4(3H)-one derivatives. A plausible reaction pathway has been proposed based on the mechanistic
A lithium-bromide-promoted nucleophilicsubstitution/annulation cascade reaction between CF3-imidoyl sulfoxonium ylides and 1,3-dicarbonyl compounds has been established, and the corresponding 1,2,3-trisubstituted 5-trifluoromethylpyrroles have been obtained in 27–78% yield. This reaction features a broad substrate scope and generates dimethylsulfoxide and H2O as byproducts.
已经建立了溴化锂促进的 CF 3 -亚氨酰基锍叶立德与 1,3-二羰基化合物之间的亲核取代/环化级联反应,并在 27-78 年获得了相应的 1,2,3-三取代 5-三氟甲基吡咯% 屈服。该反应具有广泛的底物范围,并生成二甲基亚砜和 H 2 O 作为副产物。
Palladium-Catalyzed Four-Component Carbonylative Cyclization Reaction of Trifluoroacetimidoyl Chlorides, Propargyl Amines, and Diaryliodonium Salts: Access to Trifluoromethyl-Containing Trisubstituted Imidazoles
A palladium-catalyzed four-component carbonylativecyclization reaction for the expeditious construction of trifluoromethyl-containing trisubstituted imidazoles has been achieved. With readily accessible trifluoroacetimidoyl chlorides, propargyl amines, and diaryliodonium salts as the starting materials, the carbonylative transformation proceeds smoothly under mild conditions to enable the formation