Synthesis of 2‐Arylbenzoxazoles by Hetereogeneous γ‐MnO₂ Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols or Benzyl Amines

Abstract

Hetereogeneous γ‐MnO2 Catalyzed Redox Reaction of o‐Nitrophenol with Benzyl Alcohols/ benzyl amines for the synthesis of 2‐Arylbenzoxazoles is described here. Surface active Mn+3 species and the surface O−& O2− species were found to play an important role in the catalytic activity. Catalyst is easy to prepare, economic and can be reused for several times. The procedure is very simple and general and applicable for wide range of substrates to afford 2‐aryl benzoxazole in good to excellent yield.