Reaction of 4,6-dimethyl quinoline-2-carboxaldehyde catalysed by potassium cyanide results in the formation of an enediol (la). On oxidation with air 1,2-diketone (1b) was obtained which upon condensation with 4-methyl-phenylenediamine formed relevant 2,3-dihetaryl-4-methyl quinoxaline (le).
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