1′-(1,3-Diphenyl-1H-pyrazol-4-yl)-1′′-methyl-2′,3′,5′,6′,7′,7a’-octahydro-1′H-dispiro[1-benzopyran-3,2′-pyrrolizine-3′,3′′-indoline]-2′′,4-dione

In the title compound C38H32N4O3, one pyrrolidine ring adopts an envelope conformation with the N atom as the flap while other pyrrolidine ring adopts an twisted conformation. The pyrrolizine ring forms dihedral angles of 79.24 (5) and 77.57 (5)° with the chromene and indole rings, respectively. The carbonyl O atoms deviate from the least-square planes through the chromene and indole rings by 0.0113 (12) and 0.0247 (12) Å, respectively. In the crystal, non-classical C—H⋯O interactions link the molecules, generating an C(9) chain along the b-axis direction.

In the title compound C 38 H 32 N 4 O 3 , one pyrrolidine ring adopts an envelope conformation with the N atom as the flap while other pyrrolidine ring adopts an twisted conformation. The pyrrolizine ring forms dihedral angles of 79.24 (5) and 77.57 (5) with the chromene and indole rings, respectively. The carbonyl O atoms deviate from the least-square planes through the chromene and indole rings by 0.0113 (12) and 0.0247 (12) Å , respectively. In the crystal, non-classical C-HÁ Á ÁO interactions link the molecules, generating an C(9) chain along the b-axis direction.
The crystal packing is stabilized by non-classical C-H···O interactions ( Table 1). The C34-H33···O3 i interaction generates a C(9) chain along the b axis. The symmetry code: (i) x, y+1, z. The packing view of the compound is shown in

Experimental
A mixture of methyl isatin (1.05 mmol), sarcosine (1.1 mmol), dipolarophile (1.0 mmol) in ethanol was refluxed for 85 min and cooled to room temperature. Then the mixture was poured into crushed ice breaker and the solid formed in the mixture was filtered, dried, and recrystallized from ethanol to obtain the pure product in good yield 93%.

Refinement
Hydrogen atoms were placed in calculated positions with C-H = 0.93-0.98Å and refined in the riding model with fixed isotropic displacement parameters: U iso (H) = 1.5U eq (C) for methyl group and U iso (H) = 1.2U eq (C) for other groups.

Special details
Geometry. All s.u.'s (except the s.u. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell s.u.'s are taken into account individually in the estimation of s.u.'s in distances, angles and torsion angles; correlations between s.u.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell s.u.'s is used for estimating s.u.'s 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 R-factors(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.