An efficient method to access 2-fluoroalkylbenzimidazoles by PIDA oxidation of amidines
摘要:
A mild and practical strategy for the synthesis of 2-bromodifluoromethyl (or trifluoromethyl)-1H-benzimidazoles via PIDA-mediated oxidative intramolecular cyclization of the fluorinated amidines is described. The approach has the advantages of superior yields, excellent functional groups tolerance and mild reaction conditions. (C) 2011 Elsevier B.V. All rights reserved.
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.