5-(4-Fluoro-benzyl-idene)-4'-(4-fluoro-phen-yl)-1,1'-dimethyl-dispiro-[piperidine-3,3'-pyrrolidine-2',3''-indoline]-4,2''-dione.

Abstract

The asymmetric unit of the title compound, C30H27F2N3O2, contains two independent mol­ecules. The pyrrolidine five-membered ring assumes an envelope conformation (with the CH2 atom at the flap) in one mol­ecule and a twisted conformation in the other one. In both independent mol­ecules, the 4-piperidinone rings adopt a similar twisted chair conformation. In the crystal, the two independent mol­ecules form an R 2 2(8) dimer through a pair of N—H⋯O hydrogen bonds; the R 2 2(8) dimers are connected via weak C—H⋯O hydrogen bonds, leading to a chain extending along the c axis.