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Paper | Regular issue | Vol 26, No. 8, 1987, pp.2159-2164
Published online, 1st January, 1970
DOI: 10.3987/R-1987-08-2159
Synthesis of Substituted 3-Pyridinecarboxaldehydes

Daniel L. Comins and James J. Herrick

*Department of Chemistry abd Biochemistry, Utah State University, Logan, Utah 84332-0300, U.S.A.

Abstract

Treatment of 3-substituted 1-(phenoxycarbony1)-1,2-dihydropyridines with Vilsmeier reagent (POCl3/DMF) gave 3-substituted 5-fomyl-1- (phenoxycarbonyl)-1,2-dihydropyridines, which were aromatized with hot sulfur to provide 5-substituted 3-pyridinecarboxaldehydes. The formylation of 4-substituted 1-(phenoxycarbony1)-1,4-dihydropyridines and subsequent armatization gave 4-substituted 3-pyridinecarboxaldehydes.