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1.  1-(1-Benzyl-1H-benzimidazol-2-yl)ethanone 
In the title compound, C16H14N2O, the benzimidazole ring system is essentially planar. The planes of the benzene rings make a dihedral angle of 85.92 (8)°. In the crystal, neighbouring molecule are connected into paris along the c axis by weak C—H⋯O interactions and the connected pairs are expanded through C—H⋯N hydrogen bonds and C—H⋯π interactions along the b axis.
PMCID: PMC3588942  PMID: 23476178
2.  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.
PMCID: PMC3470386  PMID: 23125799
3.  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.
PMCID: PMC3470319  PMID: 23125732
4.  3-(4-Bromo­phen­yl)-1-(4-chloro­benz­yl)-1H-pyrazole-5-carbaldehyde 
The title compound, C17H12BrClN2O, was synthesized by oxidation of [3-(4-bromo­phen­yl)-1-(4-chloro­benz­yl)-1H-pyrazol-5-yl]methanol under mild conditions. The pyrazole ring makes dihedral angles of 3.29 (9) and 74.91 (4)°, respectively, with the bromo­phenyl and chloro­phenyl rings.
PMCID: PMC3394000  PMID: 22798865
5.  Ethyl 2-methyl-4-phenyl­pyrido[1,2-a]benzimidazole-3-carboxyl­ate 
The title compound, C21H18N2O2, was synthesized using a novel tandem annulation reaction between (1H-benzimidazol-2-yl)(phen­yl)methanone and (E)-ethyl 4-bromo­but-2-enoate under mild conditions. The dihedral angles between the mean planes of the five-membered imidazole ring and the pyridine, benzene and phenyl rings are 0.45 (6), 1.69 (1) and 70.96 (8)°, respectively. In the crystal, mol­ecules are linked through inter­molecular C—H⋯N hydrogen bonds.
PMCID: PMC3247584  PMID: 22219889
6.  Ethyl 1-benzyl-3-(4-bromo­phen­yl)-1H-pyrazole-5-carboxyl­ate 
In the title compound, C19H17BrN2O2, the pyrazole ring makes dihedral angles of 88.00 (16) and 5.78 (13)° with the phenyl and bromo­phenyl rings, respectively. In the crystal, mol­ecules are linked by weak inter­molecular C—H⋯O hydrogen bonds.
PMCID: PMC3212308  PMID: 22090965
7.  Ethyl 1-(4-chloro­benz­yl)-3-(4-fluoro­phen­yl)-1H-pyrazole-5-carboxyl­ate 
In the title compound, C19H16ClFN2O2, the pyrazole ring makes dihedral angles of 5.15 (6) and 77.72 (6)°, with the fluoro­phenyl and chloro­phenyl rings, respectively.
PMCID: PMC3120511  PMID: 21754776
8.  Ethyl 6-methyl-2-p-tolyl­pyrazolo[1,5-a]pyridine-5-carboxyl­ate 
In the title mol­ecule, C18H18N2O2, the bicyclic ring system and the benzene ring form a dihedral angle of 13.45 (3)°. In the crystal structure, weak inter­molecular C—H⋯O hydrogen bonds link mol­ecules into chains propagated along [201].
PMCID: PMC2970404  PMID: 21577837
9.  Ethyl 5-(ethoxy­carbon­yl)-3-(4-methoxy­phen­yl)-1H-pyrazole-1-acetate 
In the title compound, C17H20N2O5, all bond lengths and angles show normal values. The dihedral angle between the pyrazole ring and the benzene ring is 6.98 (11)°. The mol­ecules are linked by inter­molecular C—H⋯π inter­actions.
PMCID: PMC2915022  PMID: 21200941
10.  1-(2-Hydr­oxy-5-methoxy­phen­yl)ethan-1-one N-[(E)-1-(2-hydr­oxy-5-methoxy­phen­yl)ethyl­idene]hydrazone 
In the title mol­ecule, C18H20N2O4, which resides on a crystallographic centre of inversion (at the centre of the N—N bond), all non-H atoms apart from the meth­oxy substituent are approximately coplanar. The structure displays intra­molecular O—H⋯N hydrogen bonding.
PMCID: PMC2915233  PMID: 21200731

Results 1-10 (10)