Mohamed Ellouz

Crystal structure of (Z)-ethyl 2-{5-[(2-benzyl-idene-3-oxo-2,3-di-hydro-benzo[b][1,4]thia-zin-4-yl)meth-yl]-1H-1,2,3-triazol-1-yl}acetate.

The title compound, C22H20N4O3S, features two fused six-membered rings linked to a 1,2,3-triazole ring which is attached to an ethyl acetate group. The heterocycle in the benzothiazine residue has an envelope conformation with the S atom being the flap. The conformation of the ethyl acetate side chain, which is directed to the same side of the molecule as the C6 ring of the fused-ring system, may be partially established by a pair of weak intramolecular C—H⋯O(carbonyl) interactions. The three-dimensional packing is aided by intermolecular C—H⋯O and C—H⋯N interactions.

Crystal structure of 4-benzyl-2H-benzo[b][1,4]thia­zin-3(4H)-one

In the title compound, C15H13NOS, the thiazine ring adopts a twisted boat conformation and the dihedral angle between the aromatic rings is 86.54 (4)°. In the crystal, molecules are linked by weak C—H⋯O interactions, resulting in chains along [010].

Crystal structure of (E)-2-benzyl-idene-4-[(3-phenyl-4,5-di-hydro-isoxazol-5-yl)meth-yl]-2H-benzo[b][1,4]thia-zin-3(4H)-one.

In the title compound, C25H20N2O2S, the dihydroisoxazole ring exhibits an envelope conformation with the methine atom being the flap, while the 1,4-thiazine ring displays a screw-boat conformation. The six-membered ring fused to the 1,4-thiazine ring makes dihedral angles of 63.04 (2) and 54.7 (2)° with the mean planes through the five-membered heterocycle and the attached phenyl ring, respectively. The phenyl group connected to the 1,4-thiazine ring is disordered over two sites [major component = 0.57 (2)]. The most prominent interactions in the crystal structure are C—H⋯O hydrogen bonds that link molecules, forming inversion dimers, and C—H⋯N hydrogen bonds that link the dimers into columns parallel to the b axis.

Crystal structure of (Z)-2-benzyl­idene-4-methyl-2H-benzo[b][1,4]thia­zin-3(4H)-one

In the title compound, C16H13NOS, the 1,4-thiazine ring displays a screw-boat conformation. The conformation about the ethene bond [1.344 (2) Å] is Z. The plane of the fused benzene ring makes a dihedral angle of 58.95 (9)° with the pendent phenyl ring, indicating a twisted conformation in the molecule. In the crystal, molecules are linked by pairs of C—H⋯O hydrogen bonds, forming inversion dimers.