Abstract
In the title compound, C21H20FN3O5, the the pyrrolidine ring makes dihedral angles of 84.91 (6) and 62.38 (7)° with the oxindole unit and the fluorophenyl ring, respectively. The pyrrolidine ring assumes an envelope conformation with the spiro C atom as the flap. The crystal packing features weak N—H⋯N and C—H⋯O hydrogen bonds.
Highlights
In the title compound, C21H20FN3O5, the the pyrrolidine ring makes dihedral angles of 84.91 (6) and 62.38 (7) with the oxindole unit and the fluorophenyl ring, respectively
In the title compound (Fig. 1), the N—C and C—C bond lengths are slightly longer than the normal values, but are comparable with those in other reported structures (e.g. Usha et al, 2005)
This may be due to the spiro-atom character and the steric forces of bulky substituents in the pyrrolidine moiety
Summary
Post Graduate and Research Department of Physics, Queen Mary’s College, Chennai-4, Tamilnadu, India, and bDepartment of Organic Chemistry, University of Madras, Maraimalai Campus, Chennai-25, Tamilnadu, India Hydrogen-bond geometry (Å, ). R factor = 0.047; wR factor = 0.132; data-to-parameter ratio = 9.4. In the title compound, C21H20FN3O5, the the pyrrolidine ring makes dihedral angles of 84.91 (6) and 62.38 (7) with the oxindole unit and the fluorophenyl ring, respectively. The pyrrolidine ring assumes an envelope conformation with the spiro C atom as the flap. The crystal packing features weak N—H N and C—H O hydrogen bonds.
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