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1.  Ethyl 2,4-dimethyl­pyrido[1,2-a]benz­imidazole-3-carboxyl­ate 
The title compound, C16H16N2O2, was synthesized using a novel tandem annulation reaction between 1-(1H-benzo[d]imidazol-2-yl)ethanone and ethyl (E)-4-bromo­but-2-enoate under mild conditions. The dihedral angles formed by the mean plane of the five-membered imidazole ring with the dihydro­pyridin and benzene rings are 1.54 (9) and 1.85 (9)°, respectively.
doi:10.1107/S1600536812040299
PMCID: PMC3470386  PMID: 23125799
2.  4-Acetyl-1H-pyrrole-2-carbaldehyde 
The title compound, C7H7NO2, was synthesized via a one-pot Vilsmeier–Haack and subsequent Friedel–Crafts reaction. The pyrazole ring makes dihedral angles of 4.50 (9) and 2.06 (8)°, respectively, with the aldehyde and acetyl groups. In the crystal, classical N—H⋯O hydrogen bonds and weak C—H⋯O inter­actions assemble the mol­ecules into a chain along the b axis.
doi:10.1107/S1600536812039153
PMCID: PMC3470319  PMID: 23125732

Results 1-2 (2)