Abstract
The oxidation of diethyl 1-methyl- or 1-aryl-2,6-dimethyl-4-aryl-1,4-dihydropyridine-3,5-dicarboxylates with hydrogen peroxide in the presence of perchloric acid gave the perchlorates of the corresponding pyridinium ions, the reduction of which with NaBH4 is a preparative method for the synthesis of diethyl esters of 1-substituted 2,6-dimethyl-1,2-dihydropyridine-3,5-dicarboxylic acids. Derivatives of the 5-carboxylic acid of the corresponding 1,2-dihydropyridine are formed by alkaline hydrolysis of these esters.
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