METHOD OF OBTAINING 6-ETHOXYCARBONYLMETHYL-

Oxidation of the sulfur atom in methyl 4-(2-chlorophenyl)-5-cyano-6-ethoxycarbonylmethylsulfanyl-2-methyl-1,4-dihydropyridine-3-carboxylate with m-chloroperbenzoic acid in dichloromethane gave methyl 4-(2-chlorophenyl)-5-cyano-6-ethoxycarbonylmethylsulfinyl-2,3-dihydroxy-2-methyl-1,2,3,4-tetra-hydropyridine-3-carboxylate. The structure of the compound obtained was identified by