5-Nitro-2-(piperidin-1-yl)benzaldehyde

In the structure of the title compound, C12H14N2O3, the piperidine ring adopts a chair conformation and the aryl substitutent occupies an equatorial position

Novel synthesis of benzimidazole by Ring Contraction Rearrangement of benzodiazepine

Condensation of substituted aromatic ketones (acetophenone) and substituted aldehydes give unsaturated ketones 14 (chalcones) which react with o-phenylenediamine 7 to afford the corresponding benzodiazepines 15. Treatments of benzodiazepines under basic conditions give benzimidazole derivatives. Structures of all synthesized compounds have been characterized by their NMR and mass spectral data.Keywords: N’-Thioacylamidines, Chalcone, o-phenylenediamine, benzodiazepine, benzimidazole

Ethyl 5-cyano-8-nitro-2,3,4,4a,5,6-hexahydro-1H-pyrido[1,2-a]quinoline-5-carboxylate

In the title compound, C17H19N3O4, the piperidine ring adopts a chair conformation. The crystal structure features inversion dimers linked by pairs of weak C—H⋯N hydrogen bonds