1′,1′′-Dimethyl-4′-phenyl­dispiro­[11H-indeno­[1,2-b]quinoxaline-11,2′-pyrrolidine-3′,3′′-piperidin]-4′′-one

In the title compound, C₃₀H₂₈N₄O, the central pyrrolidine ring adopts an envelope conformation with the CH₂ C atom as the flap. The quinoxaline and indene ring systems are planar, with r.m.s. deviations of 0.0165 and 0.0181 Å, respectively. The pyrrolidine ring mean plane forms dihedral angles of 88.84 (1) and 86.14 (1)° with the quinoxaline and indene ring systems, respectively. A weak intra­molecular C—H...N inter­action is observed. In the crystal, C—H...O inter­actions lead to helical supra­molecular chains along the b axis having a C(9) motif.

1′,1′′-Dimethyl-4′-(4-methyl­phen­yl)di­spiro­[11H-indeno­[1,2-b]quinoxaline-11,2′-pyrrolidine-3′,3′′-piperidin]-4′′-one

In the title compound, C₃₁H₃₀N₄O, the central pyrrolidine ring adopts an envelope conformation with the methyl­ene C atom being the flap. The quinoxaline and indane rings are each planar, having r.m.s. deviations of 0.030 and 0.050 Å, respectively. The pyrrolidine ring mean plane forms dihedral angles of 88.25 (1) and 83.76 (1)° with the quinoxaline and indane rings, respectively. Intra­molecular C—H...O and C—H...N inter­actions are observed. In the crystal, C—H...π inter­actions lead to helical supra­molecular chains along the b-axis direction.

14a-Hy­droxy-12-methyl-10-(4-methyl­phen­yl)-8,9,9a,10,12,13,14,14a-octa­hydro-10a,14-methano-5H-indeno­[2′,1′:4,5]azepino[3,4-b]pyrrolizine-5,15(7H,11H)-dione

In the title compound, C₂₇H₂₈N₂O₃, each of the pyrrolidine rings adopts a twisted conformation, as does the cyclo­pentane ring. The indane ring has an r.m.s deviation of 0.0693 Å. The dihedral angle between the mean plane of the pyrrolizine ring and indane system is 82.58 (1)°. The piperidine ring has the methyl substituent in an equatorial position and adopts a twisted chair conformation. The mol­ecular structure is stabilized by a weak intra­molecular O—H...N inter­action.