1-Methyl-1′-(4-methylphenyl)-2′,3′,5′,6′,7′,7a'-hexahydro-1′H-dispiro[piperidine-3,2′-pyrrolizine-3′,3′′-indoline]-4,2′′-dione

The title compound, C26H29N3O2, crystallizes with two molecules in the asymmetric unit, having C—H...O interactions between them and resulting in a dimer characterized by an R22(11) motif. These dimers are linked into an ABABAB chain via N—H...O, N—H...N and C—H...O built edge-fused R12(5) and R22(7) motifs. This chain is linked to its inversion-related partner via N—H...O bonds with an R22(8) motif and leads to a double chain extending along the b axis characterized by an R66(36) motif across the inversion centres. The methyl group of the phenyl ring and the oxindole of molecule A and B are involved in C—H...π interactions. One C atom of the pyrrolizine ring of molecule A and its attached H atoms show positional disorder, the major and minor components being in the ratio 0.706 (7):0.294 (7).

Abstract licence: CC BY

1. 4.

   Structure validation in chemical crystallography · 2009

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