A novel electron‐donor–acceptor (EDA) complex‐mediated direct CH trifluoromethylation of arenes with Umemoto’s reagent has been developed. This transformation has been enabled by an unprecedented EDA complex formed by Umemoto’s reagent and an amine, which was supported by experiments and theoretical calculations. The radical‐based methodology presented here allows to access highly‐functionalized trifluoromethyl
p-TsOH promoted Fischer indole synthesis of multi-substituted 2-trifluoromethyl indole derivatives
作者:Haizhen Jiang、Yangli Wang、Wen Wan、Jian Hao
DOI:10.1016/j.tet.2010.01.080
日期:2010.4
promoted one-pot synthesis of multi-substituted 2-trifluoromethyl indolederivatives, for instance, 2-trifluoromethyl-3-phenylindoles, 2-trifluoromethyl-indole-3-propanoates, and 2-trifluoromethyl-indole-3-butanoates from reactions of 1,1,1-trifluoro-3-phenylacetone and simply prepared ω-trifluoromethyl substituted δ and ɛ-ketoesters with arylhydrazines viaFischerindolesynthesis has been developed
Concise synthesis of ω-fluoroalkylated ketoesters. A building block for the synthesis of six-, seven-, and eight-membered fluoroalkyl substituted 1,2-diaza-3-one heterocycles
were subsequently subjected as a fluorine-containing buildingblock to the synthesis of 1,2-diaza-3-one heterocycles has been optimized. Trifluoromethyl substituted seven- and eight-membered 1,2-diazapinone 8, 1,2-diazocinone 10 were also obtained via this sequential reaction of δ- (or ɛ-) trifluoromethyl ketoesters with hydrazine hydrates in acidic condition. In contrast, the sequential reaction of
Direct C2-selective trifluoromethylation of indole derivatives was achieved with Togni's hypervalent iodine reagent and CuOAc as a catalyst in MeOH under mild conditions, affording the desired C2-trifluoromethylated indoles in good yield (up to 90%). (C) 2010 Elsevier Ltd. All rights reserved.
Rapid trifluoromethylation of indole derivatives was achieved using trimethylsilyltriflate as the catalyst. Good to high yields were observed within only 5 min at room temperature. This reaction system is able to provide not only the mono-trifluoromethylated products, but also the di-trifluoromethylated derivatives, because of its high reaction efficiency.