In the title compound, C30H23NO2, the five-membered rings are both in envelope conformations with the same spiro C atom as the flap. The benzene ring and the two phenyl rings are inclined to the mean plane of the indene ring system by 83.98 (8), 81.46 (8) and 72.31 (7)°. In the crystal, molecules are linked by pairs of C—H⋯O hydrogen bonds into inversion dimers. The dimers are further connected by C—H⋯N interactions, forming layers parallel to (10-1).
<p>New spiroisoxazolines <strong>3</strong> have been synthesized by 1,3-dipolar cycloaddition of arylnitrile oxides with 2-arylidenes-3-phenyl-1-indanones. The reaction occurs in a regiospecific and diastereospecific manner and leads to one cycloadduct in all the cases. The proposed structure of the obtained cycloadducts was established based on spectroscopic data and confirmed by radiocrystallographic study. The spectral data were in favor of the observed regiochemistry and diastereoselectivity of this reaction.</p>
The title compound, C20H16ClNO3S, is built up from three fused rings, one five- and two six-membered rings, linked to a 3-ethoxycarbonyl group and to a 4-chlorophenyl ring. The hydropyran ring has a flattened envelope conformation, with the C atom substituted by the 4-chlorophenyl ring as the flap (displaced by 0.077 (2) Å from the plane through the other atoms). The fused three-ring system is quasi-planar (r.m.s. deviation = 0.057 Å), with the largest deviation from the mean plane being 0.106 (1) Å for the C atom substituted by the 4-chlorophenyl ring. The 4-chlorophenyl ring is approximately perpendicular to the mean plane of the fused ring system, as indicated by the dihedral angle of 77.32 (6)° between their mean planes. There is an intramolecular N—H⋯O hydrogen bond forming an S(6) ring motif. In the crystal, molecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R
2
2(12) ring motif. There are also short intermolecular Cl⋯O interactions present [3.1226 (12) Å] between neighbouring molecules.
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