Hydrogen-bonded supramolecular structures of three related 4-(5-nitro-2-furyl)-1,4-dihydropyridines

Abstract

In ethyl 5-cyano-2,6-dimethyl-4-(5-nitro-2-furyl)-1,4-dihydropyridine-3-carboxylate, C15H15N3O5, the molecules are linked into chains by a single N - H⋯O hydrogen bond. The molecules in diethyl 2,6-dimethyl-4-(5-nitro-2-furyl)-1,4-dihydropyridine-3,5-dicarboxylate, C17H20N2O7, are linked by a combination of one N - H⋯O hydrogen bond and two C - H⋯O hydrogen bonds into sheets built from equal numbers of R22(17) and R44(18) rings. In 2,6-dimethyl-4-(5-nitro-2-furyl)-1,4-dihydropyridine-3,5-dicarbonitrile, C 13H10N4O3, the molecules are linked by a combination of a three-centre N - H⋯(O)2 hydrogen bond and two independent two-centre C - H⋯O hydrogen bonds into complex sheets containing four types of ring. © 2006 International Union of Crystallography.