A simple and efficient method for the synthesis of 2‐trifluoromethyl quinolines by means of visible‐light‐induced radicalcyclization of trifluoroacetimidoylchlorides with alkynes has been developed. This protocol allows the generation of imidoyl radicals by activation of C(sp2)Cl bonds using a photoredox catalyst under mild and environmentally friendly conditions (see scheme).
Au(I)-Catalyzed Intramolecular Hydroamination of the Fluorinated <i>N′</i>-Aryl-<i>N</i>-Propargyl Amidines: Mild Conditions for the Synthesis of 2-Fluoroalkyl Imidazole Derivatives
The gold(I)-catalyzedsynthesis of 2-fluoroalkyl imidazolederivatives was developed. Catalyzed by gold(I), propargyl amidines underwent a 5-exo-dig cyclization to afford 2-fluoroalkyl-5-methyl imidazoles. Also, 2-fluoroalkyl imidazole-5-carbaldehydes were obtained in the presence of NIS. A mechanism investigation manifested the probable process and the carbonyl oxygen derived from O2.
<i>N</i>-Iodosuccinimide-Mediated Synthesis of Benzo-Fused Bisimidazoles Enabled by a One-Pot Tandem Reaction of Fluorinated Propargyl Amidines
作者:Shan Li、Lu Lei、Bin Feng、Xiaofeng Liu、Liqing Xian、Yajun Li
DOI:10.1021/acs.joc.2c02379
日期:——
efficient tandem reaction between fluorinated propargyl amidines and aromatic o-diamines without any metal catalyst and additive under mild reaction conditions was developed for the synthesis of benzo-fused bisimidazoles in moderate to excellent yields. Preliminary mechanistic studies suggested that this reaction proceeded by an intermediate of secondary aminederivedfrom 5-iodomethyl imidazole, and NIS
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.
Switching reaction pathways of trifluoromethylated thiobenzanilides by choice of different oxidative systems
Trifluoromethylated thiobenzanilides are efficiently converted to 2-trifluoromethylbenzothiazoles via intramolecular oxidative cyclization under CAN/NaHCO(3) oxidation, while the dimerized products with "-S-S-" bond linkage are obtained when PIDA is used as an oxidant. (C) 2011 Elsevier B.V. All rights reserved.