Syntheses of Some 1,2- and 1,4-Dihydropyridines and X-Ray Crystal Structures of 1-Dimethylamino-5-ethoxycarbonyl-1,4-dihydro-3-methoxycarbonyl-2- methyl-4-phenylpyridine, 3-Cyano-3,4-dihydro-5-methoxycarbonyl-6-methyl-4-phenylpyridin-2( 1H)-one and 5-Ethoxycarbonyl-1,4-dihydro-3-methoxycarbonyl-1,2-dimethyl-4-phe nylpyridine

Abstract

We describe a synthesis of an α-unsubstituted 1,4-dihydropyridine 10 and its 1,2-dihydro isomer, and crystal structures of 10 and some by-products 5 and 6 obtained during the ring synthesis.