Crystal structure of 4'-(2-methoxyquinolin-3-yl)-1'-methyldispiro[indan-2,2'-pyrrolidine-3',3''-indoline]-1,3,2''-trione

In the title compound, C₃0H₂₃N₃O4, the central 1-methylpyrrolidine ring adopts a twist conformation on the N - CH₂ bond. The pyrrolidin-2-one ring of the indolin-2-one ring system also has a twist conformation on the C - C bond involving the spiro C atom and the carbonyl C atom. The five-membered ring of the indene-1,3-dione moiety has an envelope conformation with the spiro C atom as the flap. The quinoline ring system adopts an almost planar conformation (r.m.s. deviation = 0.04Å). The mean planes of the indolin-2-one ring system, the indene-1,3-dione ring system and the the quinoline ring system are inclined to the mean plane of the central 1-methylpyrrolidine ring by 77.97(7), 86.98(7) and 46.58(6)°, respectively. In the crystal, molecules are linked via N - H⋯N hydrogen bonds, forming chains along the b axis. The chains are linked via a number of C - H⋯O hydrogen bonds, and C - H⋯π and π-π interactions [inter-centroid distance = 3.7404(9)Å], forming a three-dimensional network.