K. V. Sujith

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Efficient approach to the synthesis of a series of triazolothiadiazole analogs of ibuprofen has been carried out using microwave energy. Thus a series of 1,2,4-triazolo[3,4-b]-thiadiazoles 5 were synthesized starting from 4-amino-3-[1-(4-isobutylphenyl)ethyl]-5-mercapto-1,2,4-triazole 3 and different aromatic acids using phosphorous oxychloride as cyclizing(More)
In the title compound, C(18)H(19)ClN(4)O(3), the dihydro-pyrimidin-one ring adopts a flattened boat conformation. The dihedral angle between the phenyl and pyrazole rings is 43.39 (6)°. An intra-molecular C-H⋯O contact generates an S(8) ring motif that stabilizes the mol-ecular conformation and precludes the carbonyl O atom of the ester group from forming(More)
The asymmetric unit of the title compound, C(20)H(23)BrN(2)O, contains two independent mol-ecules (A and B), in which the orientations of the 4-isobutyl-phenyl units are different. The dihedral angle between the two benzene rings is 88.45 (8)° in mol-ecule A and 89.87 (8)° in mol-ecule B. Mol-ecules A and B are linked by a C-H⋯N hydrogen bond. In the(More)
The asymmetric unit of title compound, C(20)H(23)ClN(2)O, consists of two crystallographically independent mol-ecules (A and B) in which the orientations of the 4-isobutyl-phenyl units are different. The isobutyl group of mol-ecule B is disordered over two positions with occupancies of 0.850 (5) and 0.150 (5). The dihedral angle between the two benzene(More)
In the title compound, C(16)H(16)ClN(3)O·H(2)O, the dihedral angle between the two aromatic rings is 44.58 (11)°. The N atom of the dimethyl-amino group adopts a pyramidal configuration. In the crystal structure, mol-ecules are linked into a two-dimensional network parallel to the (001) plane by inter-molecular N-H⋯O, O-H⋯N and O-H⋯O hydrogen bonds(More)
In the title compound, C(15)H(13)N(3)O(3)·H(2)O, the two benzene rings form a dihedral angle of 2.03 (2)°. In the crystal structure, adjacent hydrazide mol-ecules are linked into dimers by water mol-ecules; these dimers are then stacked along the b axis. Inter-molecular O-H⋯O, O-H⋯N and C-H⋯O hydrogen bonds and a π-π stacking inter-action between the(More)
In the asymmetric unit of the title compound, C(16)H(16)N(4)O(3)·H(2)O, there are two symmetry-independent hydrazide mol-ecules with almost identical geometries, and two independent water mol-ecules. The dihedral angles between the two benzene rings in the two hydrazide mol-ecules are 0.11 (5) and 0.77 (5)°. In one mol-ecule, an intra-molecular C-H⋯O(More)
The title compound, C(15)H(14)N(2)O, crystallized with two independent mol-ecules in the asymmetric unit. Both mol-ecules are non-planar and have an E configuration with respect to the C=N bond. The dihedral angles between the two benzene rings are 11.1 (2)° in one mol-ecule and 12.40 (19)° in the other. In the crystal structure, the mol-ecules are linked(More)
The asymmetric unit of the title compound, C(21)H(25)ClN(2)O, contains four crystallographically independent mol-ecules, which differ mainly in the orientation of the isobutyl groups. The benzene rings are almost orthogonal to each other, forming dihedral angles of 87.40 (6), 88.69 (6), 84.88 (6) and 85.12 (6)° in the four mol-ecules. The crystal structure(More)
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