Catalytic Amidation of 5‐Hydroxymethylfurfural to 2,5‐Furandicarboxamide over Alkali Manganese Oxides

Abstract

Abstract2,5‐Furandicarboxamide was firstly synthesized in yield of 85% via catalytic oxidative amidation of 5‐hydroxymethylfurfural with aqueous NH3 over alkali manganese oxides of α‐MnO2/NaxMnO2. The intermediates of 5‐hydroxymethyl‐furonitrile, 2,5‐dicyanofuran, and 5‐cyano‐2‐furancarboxamide were verified and their reactivities were further examined. The kinetic analysis results showed that the transformation of intermediate product of 5‐cyano‐2‐furancarboxamide to 2,5‐furan‐dicarboxamide is a slower step, which is closely relative to the reaction temperature and basicity of catalyst.