Enhanced catalytic performance of ZnO/carbon materials in the green synthesis of poly-substituted quinolines

A highly efficient methodology for the selective synthesis of nitrogen heterocycles via Friedländer reaction using carbon materials supported ZnO catalysts under green chemistry domain is presented. The influence physicochemical properties different supports, in particular an activated (AC), multi-walled nanotubes (MWCNT) and a aerogel (CA), on catalytic performance discussed. developed are easily prepared by simple incipient wetness impregnation subsequent thermal treatment. These ZnO/carbon showed great condensation 2-amino-5-chlorobenzaldehyde carbonylic compounds with enolizable hydrogens, solvent-free mild conditions, affording all cases selectively total conversion to corresponding quinoline. Both Zn loading combination microporosity selected supports seem be key factors determining performance. Yields obtained composites superior those others widely used fine such as, Zn-catalysts mesoporous silica (SBA-15) Zn-metal-organic-frameworks (MOF).