Copper-catalyzed synthesis of 2-aminobenzimidazoles from carbonimidoyl dichlorides and amines
摘要:
A new protocol for the synthesis of a variety of 2-aminobenzimidazole derivatives has been developed. O-haloaryl carbonimidoyl dichloride reacted with anilines to generate an o-haloaryl guanidine intermediate, which underwent copper catalyzed ring closure to afford 2-aminobenzimidazole derivative in moderate yields (c) 2012 Elsevier Ltd. All rights reserved.
A Protocol to 2-Aminobenzimidazoles via Copper-Catalyzed Cascade Addition and Cyclization of <i>o</i>-Haloanilines and Carbodiimides
作者:Fei Wang、Shangjun Cai、Qian Liao、Chanjuan Xi
DOI:10.1021/jo200014v
日期:2011.5.6
for the synthesis of a variety of 2-animobenzimidazole derivatives has been developed. The reaction proceeded from o-haloanilines and carbodiimidesviacopper(I)-catalyzed domino reaction in the presence of tert-butoxide to afford the corresponding 2-animobenzimidazole derivatives in good to excellent yields. o-Haloanilines could be o-iodoaniline, o-bromoaniline, and o-chloroaniline derivatives. Carbodiimides
Synthesis of Benzoxazole and Benzimidazole Derivatives via Ligand-Free Copper(I)-Catalyzed Cross-Coupling Reaction of o-Halophenols or o-Haloanilines with Carbodiimides
作者:Guodong Shen、Weiliang Bao
DOI:10.1002/adsc.201000022
日期:——
A novel and efficient synthesis of benzoxazole and benzimidazolederivativesvia a ligand‐free, copper(I)‐catalyzed, one‐pot cascade process has been developed. A variety of carbodiimides coupled with o‐halophenols or o‐haloanilines to give the products in moderate to excellent yields under the mild conditions.