(±)-trans-5-Benzoyl-2-(1H-indol-3-yl)-4-phenyl-4,5-dihydro­furan-3-carbonitrile

The furan ring in the title compound, C26H18N2O2, is twisted about the C(H)—C(H) bond. The mol­ecular structure is stabilized by an intra­molecular C—H⋯O inter­action, which generates an S(6) ring motif. The presence of N—H⋯N hydrogen bonds leads to inversion dimers, which are stabilized in the crystal packing by C—H⋯O and C—H⋯π inter­actions, forming layers that stack along the a axis

Ethyl 2-acetyl-3-(4-chloro­anilino)butanoate

The title compound, C14H18ClNO3, adopts an extended conformation, with all of the main chain torsion angles associated with the ester and amino groups trans. In the crystal, inversion dimers linked by pairs of N—H⋯O hydrogen bonds are observed

1,1′-(p-Phenyl­enedimethyl­ene)dipiperidin-4-one

In the mol­ecule of the title compound, C18H24N2O2, the piperidine rings are in chair conformations. The crystal structure is stabilized by inter­molecular C—H⋯O hydrogen bonding. There are neither C—H⋯π nor π–π inter­actions in the structure

2,3,6-Triphenyl­piperidin-4-one

In the title mol­ecule, C23H21NO, the piperidine ring adopts a chair conformation, with the N and carbonyl C atoms as flaps, which deviate on either side of the chair by −0.706 (3) and 0.494 (3) Å, respectively. All three phenyl rings are in equatorial positions on the piperidine ring, making angles with the puckering plane of 73.5 (1), 73.1 (1) and 67.2 (1)°. Though there is no classical hydrogen bonding, the crystal is stabilized by inter­molecular C—H⋯π contacts and π–π stacking inter­actions involving phenyl rings [centroid–centroid distance = 4.424 (2) Å]

(2RS,3SR,10SR,11RS)-3,10-Diphen­oxy-18,21-dioxa-5,8-diaza­penta­cyclo­[20.4.0.02,5.08,11.012,17]hexa­cosa-1(26),12,14,16,22,24-hexa­ene-4,9-dione ethyl acetate hemisolvate

In the title compound, C34H30N2O6·0.5C4H8O2, there are two mol­ecules in the asymmetric unit and the structure is stabilized by C—H⋯O inter­actions. The two nonsolvent mol­ecules of the asymmetric unit are linked together by a weak C—H⋯O hydrogen bond. The ethyl acetate mol­ecule is present as a space filler and does not participate in the hydrogen-bonding network

1,1′-[4-(2-Methoxyphenyl)-2,6-dimethyl-1,4-dihydropyridine-3,5-diyl]diethanone

In the title compound, C18H21NO3, the 1,4-dihydro­pyridine ring exhibits a flattened boat conformation. The methoxy­phenyl ring is nearly planar [r.m.s. deviation = 0.0723 (1) Å] and is perpendicular to the base of the boat [dihedral angle = 88.98 (4)°]. Inter­molecular N—H⋯O and C—H⋯O hydrogen bonds exist in the crystal structure

7′-(Naphthalen-1-yl)-5′′-[(naphthalen-2-yl)­methyl­idene]-1′,3′,5′,6′,7′,7a′-hexa­hydro­dispiro­[acenaphthene-1,5′-pyrrolo­[1,2-c]thia­zole-6′,3′′-piperidine]-2(1H),4′′-dione

In the title compound, C43H34N2O2S, the six-membered piperidine ring adopts a half-chair conformation. The five-membered thia­zole ring adopts a slightly twisted envelope conformation and the pyrrole ring adopts an envelope conformation; in each case, the C atom linking the rings is the flap atom. The mol­ecular structure features inter- and intra­molecular C—H⋯O inter­actions. Furthermore, the crystal packing is stabilized by four inter­molecular C—H⋯π inter­actions

Crystal structure of 2-benzylamino-4-(4-bromo-phenyl)-6,7-dihydro-5H-cyclopenta[b]pyridine-3-carbonitrile

JS and RAN thank the management of The Madura College (Autonomous), Madurai, for their encouragement and support. RRK thanks the University Grants Commission, New Delhi, for funds through Major Research Project F. No. 42–242/2013 (SR).Peer reviewedPublisher PD

5-Benzoyl-2-(1H-indol-3-yl)-4-(4-methyl­phen­yl)-4,5-dihydro­furan-3-carbonitrile

The furan ring in the title compound, C27H20N2O2, adopts a twisted conformation about the sp 3—sp 3 bond. The mol­ecular structure is stabilized by an intra­molecular C—H⋯O inter­action which generates an S(6) ring motif. The crystal packing is stabilized by N—H⋯O and C—H⋯O inter­actions generating centrosymmetric R 2 2(18) and C(6) chain motifs, respectively. A weak C—H⋯π inter­action is also observed

4-Azido-2-chloro-6-methyl­quinoline

In the title compound, C10H7ClN4, the quinoline ring system is planar [maximum deviation 0.0035 (10) Å]. The crystal structure is stabilized by van der Waals and π–π stacking inter­actions [centroid–centroid distance 3.6456 (17) Å]