3′-Hy­droxy­methyl-1′-methyl-3′-nitro-4′-(o-tol­yl)spiro­[indoline-3,2′-pyrrolidin]-2-one

The title compound, C20H21N3O4, crystallizes with two mol­ecules in the asymmetric unit. In both mol­ecules, the pyrrolidine ring adopts an envelope conformation. The crystal structure is stabilized by inter­molecular C—H⋯O, N—H⋯O and O—H⋯O hydrogen bonds

1-Methyl-3-p-tolyl-3,3a,4,9b-tetra­hydro-1H-chromeno[4,3-c]isoxazole-3a-carbonitrile

In the title compound, C19H18N2O2, the dihedral angle between the mean planes of the fused chromeno and isoxazole units is 43.71 (7)°. The isoxazole and pyran rings exhibit envelope and half chair conformations, respectively. The crystal packing is stabilized by inter­molecular C—H⋯π inter­actions

(Z)-Methyl 2-[(2-eth­oxy-6-formyl­phen­oxy)meth­yl]-3-(4-ethyl­phen­yl)acrylate

The title compound, C22H24O5, consists of two substituted benzene rings linked by an ethyl acrylate group. The dihedral angle between the two benzene rings is 58.39 (7)°. The crystal packing is governed by two C—H⋯O inter­actions, one of which forms centrosymmetric dimers with a graph-set descriptor of R 2 2(18)

(Z)-Methyl 3-(2,4-dichloro­phen­yl)-2-[(2-formyl­phen­oxy)meth­yl]acrylate

In the title compound, C18H14Cl2O4, the mean planes of the methyl acrylate unit and the phenyl ring of the benzaldehyde are approximately orthogonal to each other, making a dihedral angle of 83.31 (6)°. The O atom of the aldehyde group is displaced significantly from the phenyl ring plane by 0.226 (2) Å. The methyl acrylate group adopts an E conformation. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R 2 2(24) loops

1-Methyl-3-(naphthalen-1-yl)-3,3a,4,9b-tetra­hydro-1H-chromeno[4,3-c]isoxazole-3a-carbonitrile

In the title compound, C22H18N2O2, the pyran ring of the chromene unit is fused with an isoxazole ring, which adopts an N-envelope conformation with the N atom lying 1.3291 (14) Å from the mean plane of the remaining ring atoms [maximum deviation = 0.341 (2) Å]. The dihedral angle between the isoxazole and chromene units is 43.74 (8)° and that between the iosxazole ring and the naphthalene ring system is 58.82 (8)°. In the crystal, the molecules are linked by weak C—H⋯π inter­actions

Crystal structure of (E)-2-[(4-chloro-2H-chromen-3-yl)methylidene]-N-cyclohexylhydrazinecarbothioamide

In the title compound, C17H20ClN3OS, the mean plane of the central thiourea core makes dihedral angles of 26.56 (9) and 47.62 (12)° with the mean planes of the chromene moiety and the cyclohexyl ring, respectively. The cyclohexyl ring adopts a chair conformation. The N–H atoms of the thiourea unit adopt an anti conformation. The chromene group is positioned trans, whereas the cyclohexyl ring lies in the cis position to the thione S atom, with respect to the thiourea C—N bond. In the crystal, molecules are linked by N—H...S hydrogen bonds, forming inversion dimers enclosing R22(8) ring motifs. The dimers are linked by C—H...Cl hydrogen bonds, enclosing R66(44) ring motifs, forming sheets lying parallel to (010)

Methyl 4-(4-bromoanilino)-2′,5-dioxo-5H-spiro[furan-2,3′-indoline]-3-carboxylate

In the title compound, C19H13BrN2O5, the spiro furan ring is almost planar with a maximum deviation of 0.034 (2) Å. The indole unit and the furan ring are normal to each other, making a dihedral angle of 87.82 (8) °. The molecular structure is stabilized by an intramolecular N—H...O hydrogen bond, which generates an S(6) ring motif. In the crystal, molecules are linked via pairs of N—H...O hydrogen bonds, forming inversion dimers enclosing R22(8) ring motifs

Crystal structures of three carbazole derivatives: 12-ethyl-7-phenylsulfonyl-7H-benzofuro[2,3-b]carbazole, (1), 2-(4,5-dimethoxy-2-nitrophenyl)-4-hydroxy-9-phenylsulfonyl-9H-carbazole-3-carbaldehyde, (2), and 12-phenyl-7-phenylsulfonyl-7H-benzofuro[2,3-b]carbazole, (3)

The three title compounds, C26H19NO3S, (1), C27H20N2O8S, (2), and C30H19NO3S, (3), are carbazole derivatives, where (1) and (3) are heterocycle-containing carbazoles with a benzofuran moiety fused to a carbazole unit. In (2), a dimethoxynitrophenyl ring is attached to the carbazole moiety. In the three derivatives, a phenylsulfonyl group is attached to the N atom of the carbazole unit. Compound (1) crystallizes with two independent molecules in the asymmetric unit (A and B). The carbazole skeleton in the three compounds is essentially planar. In compound (1), the benzene ring of the phenylsulfonyl moiety is almost orthogonal to the carbazole moiety, with dihedral angles of 85.42 (9) and 84.52 (9)° in molecules A and B, respectively. The benzene ring of the phenylsulfonyl group in compounds (2) and (3) are inclined to the carbazole moiety, making dihedral angles of 70.73 (13) and 81.73 (12)°, respectively. The S atom has a distorted tetrahedral configuration in all three compounds. In the crystals, C—H...O hydrogen bonds give rise to R22(12) inversion dimers for compound (1), and to R22(24) inversion dimers and R44(40) ring motifs for compound (2). The crystal packing in (1) also features C—H...π and π–π interactions [shortest intercentroid distance = 3.684 (1) Å], leading to supramolecular three-dimensional aggregation. In the crystal of compound (2), the combination of the various C—H...O hydrogen bonds leads to the formation of a three-dimensional network. In the crystal of compound (3), molecules are linked by C—H...O hydrogen bonds, forming chains running parallel to the a axis, and the chains are linked by C—H...π interactions, forming corrugated sheets parallel to the ab plane