Methyl 3-(4-methoxyphenyl)-1-methyl-1,2,3,3a,4,11b-hexahydrobenzo[f]chromeno[4,3-b]pyrrole-3a-carboxylate

In the title compound, C25H25NO4, the pyrrolidine ring exhibits an envelope conformation and the tetrahydropyran ring exhibits a half-chair conformation. The crystal structure is stabilized by intermolecular C–H⋯π interactions.

In the title compound, C 25 H 25 NO 4 , the pyrrolidine ring exhibits an envelope conformation and the tetrahydropyran ring exhibits a half-chair conformation. The crystal structure is stabilized by intermolecular C-HÁ Á Á interactions.
The geometric parameters of the title molecule ( Fig. 1) agree well with those reported for a similar structure (Nirmala et al., 2009). The naphthalene ring system (C1-C10) and the benzene ring (C19-C24) are oriented at an angle of 71.1 (6)°w ith respect to each other. The pyrrolidine ring makes dihedral angles of 57.7 (7), 60.2 (7) and 64.0 (8)° with the naphthalene ring system and the tetrahydropyran and phenyl rings, respectively.

) hydrogen bonds
Experimental A mixture of (2)-methyl-4-(1-formyl naphthalen-2-ylony)-3-(4-methoxy phenyl) but-2-enoate and sarcosine were refluxed in benzene for 20hr and the solvent was removed under reduced pressure. The crude product was subjected to column chromatography to get the pure product. Crystals were obtained by slow evaporation of a solution of the title compound in methanol at room temperature.

Refinement
All H atoms were fixed geometrically and allowed to ride on their parent C atoms, with C-H distances fixed in the range 0.93-0.97 Å with U iso (H) = 1.5U eq (C) for methyl H and 1.2U eq (C) for other H atoms.

Special details
Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.
Refinement. Refinement of F 2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F 2 , conventional R-factors R are based on F, with F set to zero for negative F 2 . The threshold expression of F 2 > σ(F 2 ) is used only for calculating Rfactors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F 2 are statistically about twice as large as those based on F, and R-factors based on ALL data will be even larger.