Methyl (3R*,3′S*)-1′,1′′-dimethyl-2,2′′-dioxodispiro[indoline-3,2′-pyrrolidine-3′,3′′-indoline]-4′-carboxylate

Abstract

In the title compound, C22H21N3O4, the central pyrrolidine ring adopts an envelope conformation with the N atom in the flap position. The indoline ring systems are almost perpendicular to the mean plane of the pyrrolidine ring, making dihedral angles of 86.4 (8) and 83.1 (8)°. The acetate group attached to the pyrrolidine ring assumes an extended conformation. In thecrystal, N—H...O hydrogen bonds result in the formation of a C(7) chain running along [100]. The crystal packing also features π–π interactions [centroid–centroid distance = 3.2032 (11) Å].