Abstract
AbstractA concise and efficient one‐pot sequential approach for the synthesis of 5‐salicyloyl pyridine frameworks was developed from a reaction of 3‐formylchromones, malononitrile, various alcohols, and 2‐mercaptobenzimidazole as a catalyst. Malononitrile is the nitrogen source in this reaction. In this method, the variety of 2‐alkoxypyridines derivatives containing alkoxy, allyloxy, and acetylene functional groups can increase the bathochromic effect of the λmax of pyridine to the longer wavelengths. According to experimental and theoretical investigations by the DFT method, long‐wavelength bands of 5‐salicyloyl pyridine derivatives related to the HOMO→LUMO and HOMO→LUMO+1 transitions have the π→π* nature and are caused by intramolecular charge transfer from the phenol fragment to the pyridine ring.
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