960化工网
Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazole synthesis†
Fengtian Wu,Jie Zhang,Qianbing Wei,Ping Liu,Jianwei Xie,Haojie Jiang,Bin Dai
Organic & Biomolecular Chemistry Pub Date : 10/20/2014 00:00:00 , DOI:10.1039/C4OB02068E
Abstract

A wide range of 2-substituted benzoxazoles can be efficiently synthesized from N-(2-iodo-/bromo-phenyl)benzamides, and even the less reactive N-(2-chlorophenyl)benzamides, via Cu-catalysed intramolecular coupling cyclization reactions using methyl 2-methoxybenzoate as the ligand under mild reaction conditions. In addition, the benzoxazoles can be easily prepared from the primary amides coupling with o-dihalobenzenes in a single step.

Graphical abstract: Copper-catalysed intramolecular O-arylation: a simple and efficient method for benzoxazole synthesis
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