5-(4-Fluorobenzylidene)-4′-(4-fluorophenyl)-1,1′- dimethyldispiro[piperidine-3,3′-pyrrolidine-2′,3″-indoline]-4, 2″-dione

Abstract

The asymmetric unit of the title compound, C30H 27F2N3O2, 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 R22(8) dimer through a pair of N - H···O hydrogen bonds; the R22(8) dimers are connected via weak C - H···O hydrogen bonds, leading to a chain extending along the c axis.