Acta Cryst. (2012). E68, o3344
[ doi:10.1107/S1600536812046132 ]

4'-Methyl-1H-14',19'-dioxa-4'-azaspiro[indole-3,5'-tetracyclo[18.4.0.0^2,6.0^8,13]tetracosane]-1'(24'),8',10',12',20',22'-hexaene-2,7'(3H)-dione

S. Narayanan, T. Srinivasan, S. Purushothaman, R. Raghunathan and D. Velmurugan

Abstract: In the title compound, C₂₉H₂₈N₂O₄, the indoline ring system is essentially planar, with a maximum deviation of 0.027 (2) Å; the carbonyl O atom lies 0.102 (1) Å out of the least-squares plane of the indole ring. The pyrrolidine ring adopts a C-envelope conformation, with a C atom displaced by 0.643 (2) Å from the mean plane formed by the remaining ring atoms. The pyrrolidine ring makes a dihedral angle of 86.1 (8)° with the indoline ring system. In the crystal, N-HO hydrogen bonds result in the formation of cyclic centrosymmetric dimers [R₂²(8)]. C-H interactions also occur, leading to a chain along the b-axis direction. There is a rather weak - electron interaction between the pyrrazole and benzene rings, with a centroid-centroid distance of 3.765 (1) Å.

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