A General and Straightforward Method for the Synthesis of 2-Trifluoromethylbenzothiazoles
摘要:
An efficient one-pot method for the synthesis of 2-trifluoromethylbenzothiazoles by the treatment of trifluoromethylimidoyl chlorides with sodium hydrosulfide hydrate using PdCl(2) as the sole catalyst in DMSO is described. The reaction proceeds via thiolation/C H bond functionalization/C S bond formation in moderate to high yields with good functional group tolerance.
visible-light-induced radical cascade cyclization of 2-isocyanoaryl thioethers for the synthesis of 2-CF2/CF3-containing benzothiazoles has been developed. Sodiumsulfite can participate in the photocatalytic cycle as a reductant that efficiently transforms Ir4+ into Ir3+ to promote the fluoroalkylation under mild reaction conditions.
Synthesis of 2-trifluoromethyl benzimidazoles, benzoxazoles, and benzothiazoles <i>via</i> condensation of diamines or amino(thio)phenols with CF<sub>3</sub>CN
method is developed for the synthesis of 2-trifluoromethyl benzimidazoles, benzoxazoles, and benzothiazoles in good to excellent yields by the condensation of diamines or amino(thio)phenols with in situ generated CF3CN. Additionally, the synthetic utility of the 2-trifluoromethyl benzimidazole and benzoxazole products is demonstrated via gram scale synthesis. The mechanisticstudy suggests that the reaction
A domino one–potsynthesis of 2-(trifluoromethyl) benzothiazole via copper–mediated three–component cascade reaction starting from the easily accessible starting materials such as o-iodoanilines, methyl trifluoropyruvate, and elemental sulfur is reported. The present strategy displayed a comprehensive substrate scope and good functional group tolerance and enabled access to a variety of substituted
An efficient one-pot method for the synthesis of 2-trifluoromethylbenzothiazoles by the treatment of trifluoromethylimidoyl chlorides with sodium hydrosulfide hydrate using PdCl(2) as the sole catalyst in DMSO is described. The reaction proceeds via thiolation/C H bond functionalization/C S bond formation in moderate to high yields with good functional group tolerance.
A New Synthetic Route to (Trifluoromethyl)quinolines: Nickel-Catalyzed Insertion of an Alkyne into an Aromatic C–S Bond by Formation of a Thianickelacycle and Thermal Desulfidation
developed a nickel-catalyzed insertion reaction of an alkyne into a 2-(trifluoromethyl)-1,3-benzothiazole to give a seven-membered benzothiazepine that is converted into a 2-(trifluoromethyl)quinoline by thermal desulfidation. This process can be considered a formal substitution of a sulfur atom with an alkyne. The structure of the thianickelacycle intermediate formed through oxidative addition of a C–S
我们开发了一种炔烃在镍催化下插入 2-(三氟甲基)-1,3-苯并噻唑的反应,得到七元苯并噻氮杂,通过热脱硫作用转化为 2-(三氟甲基)喹啉。这个过程可以被认为是硫原子用炔烃的形式取代。通过 X 射线单晶结构分析和原位 X 射线吸收精细结构光谱证实了通过将苯并噻唑中的 C-S 键氧化加成到镍 (0) 上而形成的硫镍环中间体的结构。