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Synthesis and Characterization of Novel 2-(1,2,3-Triazol-4-yl)-4,5-dihydro-1H-pyrazol-1-yl)thiazoles and 2-(4,5-Dihydro-1H-pyrazol-1-yl)-4-(1H-1,2,3-triazol-4-yl)thiazoles

ABSTRACT: Reactions of 1-(5-methyl)-1H-1,2,3-triazol-4-yl)ethan-1-ones and benzaldehydes in ethanol under basic conditions gave the corresponding chalcones. Reactions of the chalcones combined with thiosemicarbazide in dry ethanol containing sodium hydroxide afforded the corresponding pyrazolin-N-thioamides. Reactions of the synthesized pyrazolin-N-thioamides and several ketones (namely, ethyl 2-chloro-3-oxobutanoate, 2-bromoacetylbenzofuran, and hydrazonoyl chloride) gave the corresponding novel 2-(1,2,3-triazol-4-yl)-4,5-dihydro-1H-pyrazol-1-yl)thiazoles in high yields (77–90%). Additionally, 2-(4,5-dihydro-1H-pyrazol-1-yl)-4-(1H-1,2,3-triazol-4-yl)thiazoles were obtained in high yields (84–87%) from reactions with N-pyrazoline-thioamides and 4-bromoacetyl-1,2,3-triazoles under basic conditions. The structures of six of the newly synthesized heterocycles were confirmed by X-ray crystallography.

SUBMITTER: Kariuki B

PROVIDER: S-EPMC9786072 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature

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5-(4-Fluoro-phen-yl)-3-[5-methyl-1-(4-methyl-phen-yl)-1H-1,2,3-triazol-4-yl]-N-phenyl-4,5-dihydro-1H-pyrazole-1-carbothio-amide.

Project description:In the title compound, C26H23FN6S, the pyrazole ring has an envelope conformation, with the methine C atom being the flap atom. The thio-urea group is close to being coplanar with the pyrazole N atoms [N-N-C-S torsion angle = 176.78?(15)°], which allows for an intra-molecular N-H?N hydrogen bond; the connected triazole ring is nearly coplanar with this ring [N-C-C-N = -172.65?(19)°]. There is a significant twist between the pyrazole ring and attached fluoro-benzene ring [N-C-C-C = -18.8?(3)°] and a greater twist between triazole and attached tolyl ring [dihedral angle = 58.25?(14)°]. In the crystal, supra-molecular chains aligned along [40,10] are consolidated by ?-? inter-actions between the triazole and phenyl rings [centroid-centroid distance = 3.7053?(13)?Å].

| S-EPMC3629654 | biostudies-other

4-[3,4-Dimethyl-1-(4-methyl-phen-yl)-5-oxo-4,5-dihydro-1H-pyrazol-4-yl]-3,4-dimethyl-1-(4-methyl-phen-yl)-4,5-dihydro-1H-pyrazol-5-one.

Project description:In the title compound, C(24)H(26)N(4)O(2), the complete mol-ecule is generated by the application of twofold symmetry. The pyrazole ring is approximately planar [r.m.s. deviation = 0.026 Å] and the benzene ring is twisted out of this plane [dihedral angle = 21.94 (7)°]. A twist in the mol-ecule about the central C-C bond [1.566 (3) Å] is also evident [C-C-C-C torsion angle = 44.30 (14)°]. Supra-molecular layers in the bc plane are formed in the crystal packing via C-H⋯O and C-H⋯π inter-actions.

| S-EPMC3343962 | biostudies-literature

5-(4-Fluoro-phen-yl)-3-[5-methyl-1-(4-methyl-phen-yl)-1H-1,2,3-triazol-4-yl]-4,5-dihydro-1H-pyrazole-1-carbothio-amide.

Project description:In the title compound, C(20)H(19)FN(6)S, the pyrazole ring has an envelope conformation, with the methine C atom being the flap atom. The dihedral angle between the least-squares plane through the pyrazole and triazole rings is 7.59?(9)°, and the triazole and attached benzene ring form a dihedral angle of 74.79?(9)°. The thio-urea group is coplanar with the pyrazole ring [N-N-C-S torsion angle = -179.93?(11)°], which enables the formation of an intra-molecular N-H?N hydrogen bond. In the crystal, inversion-related mol-ecules associate via N-H?S hydrogen bonds and eight-membered {?HNCS}(2) synthons feature in the crystal packing. These synthons are connected into supra-molecular chains along the a axis via N-H?F hydrogen bonds, and the chains are consolidated into layers in the ab plane via C-H?S and C-H?F contacts.

| S-EPMC3379505 | biostudies-literature

1-[3,5-Bis(4-chloro-phen-yl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone.

Project description:In the title compound, C(17)H(14)Cl(2)N(2)O, the dihedral angles between the pyrazole ring and the mean planes of the benzene and chloro-substituted benzene rings are 75.97 (1) and 16.63 (1)° respectively. In the crystal, two weak C-H⋯O inter-molecular hydrogen bonds and π-π stacking inter-actions [centroid-centroid distances = 3.774 (4) and 3.716 (7) Å] are observed.

| S-EPMC3007262 | biostudies-literature

1-[3,5-Bis(4-fluoro-phen-yl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone.

Project description:In the asymmetric unit of the title compound, C(17)H(14)F(2)N(2)O, there are three independent mol-ecules (A, B and C) which differ slightly in the relative orientations of the two fluoro-phenyl rings. In mol-ecules A and C one of the fluoro-phenyl rings is disordered over two positions, with occupancy ratios of 0.72 (2):0.28 (2) for mol-ecule A and 0.67 (2):0.33 (2) for mol-ecule C. The dihedral angle between the two fluoro-phenyl rings in the independent mol-ecules lie in the range 70.3 (3)-84.0 (3)°. In the crystal structure, the mol-ecules are linked via inter-molecular C-H⋯O and C-H⋯F hydrogen bonds and π⋯π stacking inter-actions [centroid-centroid distance = 3.7508 (13) Å], forming a three-dimensional network.

| S-EPMC2983722 | biostudies-literature

1-[5-(Anthracen-9-yl)-3-phenyl-4,5-dihydro-1H-pyrazol-1-yl]ethanone.

Project description:In the title compound, C(25)H(20)N(2)O, the pyrazoline ring is nearly planar [maximum atomic deviation = 0.0254 (17) Å]; but the anthracene ring system is distorted from a coplanar structure [maximum atomic deviation = 0.181 (3) Å], the dihedral angle between the outer benzene rings being 10.68 (13)°. The pyrazoline ring is almost perpendicular to the mean plane of the anthracene ring system [dihedral angle = 76.94 (8)°], but nearly coplanar with the phenyl ring [dihedral angle = 1.63 (7)°]. π-π stacking is observed between parallel benzene rings of adjacent anthracene units, the face-to-face distance being 3.27 (3) Å. Weak intra-molecular C-H⋯N hydrogen bonding also occurs.

| S-EPMC3050129 | biostudies-literature

(E)-4-{[(3-Propyl-5-sulfanyl-idene-4,5-dihydro-1H-1,2,4-triazol-4-yl)imino]-meth-yl}-3-(p-tol-yl)-1,2,3-oxadiazol-3-ium-5-olate.

Project description:The title compound, C(15)H(16)N(6)O(2)S, exists in a trans configuration with respect to the acyclic N=C bond. The 1,2,3-oxadiazol-3-ium ring makes dihedral angles of 10.59?(8) and 73.94?(8)°, respectively, with the 1,2,4-triazole and benzene rings. The mol-ecular structure is stabilized by an intra-molecular C-H?S hydrogen bond, which generates an S(6) ring motif. In the crystal, mol-ecules are linked into inversion dimers by pairs of inter-molecular N-H?S hydrogen bonds, generating eight-membered R(2) (2)(8) ring motifs. The dimers are further connected by C-H?O hydrogen bonds, forming a sheet parallel to the bc plane. The ethyl group is disordered over two sets of sites with occupancies of 0.744?(7) and 0.256?(7).

| S-EPMC3201362 | biostudies-literature

3,5-Diphenyl-1-(quinolin-2-yl)-4,5-dihydro-1H-pyrazol-5-ol.

Project description:In the title compound, C(24)H(19)N(3)O, the pyrazole ring is close to being planar (r.m.s. deviation of the five fitted atoms = 0.062?Å), and each of the N-bound quinoline ring [dihedral angle = 9.90?(7)°] and the C-bound phenyl ring in the 3-position is close to being coplanar [dihedral angle = 8.87?(9)°]. However, the phenyl ring in the 5-position forms a dihedral angle of 72.31?(9)°. The hy-droxy group forms an intra-molecular hydrogen bond to the quinoline N atom. In the crystal, mol-ecules are connected into supra-molecular layers two mol-ecules thick in the bc plane by C-H?O and C-H?? inter-actions.

| S-EPMC3414180 | biostudies-literature

3-(5-Oxo-3-phenyl-4,5-dihydro-1H-pyrazol-1-yl)benzonitrile.

Project description:In the title compound, C(16)H(11)N(3)O, the dihedral angles between the 3-cyano-benzene and benzene planes and the 1H-pyrazol-5(4H)-one plane are 4.97 (9) and 9.91 (9)°, respectively.

| S-EPMC3394021 | biostudies-literature

1-[3-(Anthracen-9-yl)-5-(pyridin-2-yl)-4,5-dihydro-1H-pyrazol-1-yl]ethanone.

Project description:In the title compound, C(24)H(19)N(3)O, the pyrazoline ring adopts an envelope conformation with the C atom linking to the pyridine ring as the flap. The mean plane of the pyrazoline ring makes dihedral angles of 85.54 (4) and 81.66 (3)° with the pyridine ring and the anthracene ring system, respectively. In the crystal, mol-ecules are linked by C-H⋯O hydrogen bonds. In addition, weak π-π inter-actions [centroid-centroid distances = 3.695 (3)-3.850 (7) Å] are observed.

| S-EPMC3344501 | biostudies-literature

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