1',1''-Dimethyl-4'-phenyl-dispiro-[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 intra-molecular C-H⋯N inter-action is observed. In the crystal, C-H⋯O inter-actions lead to helical supra-molecular chains along the b axis having a C(9) motif.

1',1''-Dimethyl-4'-(4-methyl-phen-yl)di-spiro-[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 methyl-ene 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. Intra-molecular C-H⋯O and C-H⋯N inter-actions are observed. In the crystal, C-H⋯π inter-actions lead to helical supra-molecular chains along the b-axis direction.