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3-(2-Hydroxy-ethyl)-2-(p-tolyl-amino)-quinazolin-4(3H)-one.

ABSTRACT: In the title compound, C(17)H(17)N(3)O(2), the quinazolinone ring system is essentially planar. The benzene ring is twisted with respect to it by a dihedral angle of 32.7 (5)°. The mol-ecular conformation is stabilized by an N-H⋯O hydrogen bond, and the crystal structure is stabilized by inter-molecular O-H⋯N inter-actions.

SUBMITTER: Zhang GF

PROVIDER: S-EPMC2967952 | biostudies-literature |

REPOSITORIES: biostudies-literature

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2-(4-Fluoro-anilino)-3-(2-hydroxy-ethyl)quinazolin-4(3H)-one.

Project description:The mol-ecular and crystal structures of the title compound, C(16)H(14)FN(3)O(2), are stabilized by intra-molecular N-H?O and inter-molecular O-H?O hydrogen bonds. The existence of non-classical intra-molecular C-H?N hydrogen bonds provides a dihedral angle between the fluoro-substituted benzene and pyrimidinone rings of 7.9?(1)°.

| S-EPMC2968625 | biostudies-literature

2-(4-Chloro-anilino)-3-(2-hydroxy-ethyl)quinazolin-4(3H)-one.

Project description:In the title mol-ecule, C(16)H(14)ClN(3)O(2), the dihedral angle between the chloro-phenyl and pyrimidinone rings is 14.8 (1)°, while the dihedral angle between the fused benzene ring and the pyrimidinone ring is 3.8 (1)°. In the crystal structure, intra-molecular N-H⋯O hydrogen bonds, together with inter-molecular O-H⋯O hydrogen-bonding inter-actions, are present.

| S-EPMC2959957 | biostudies-literature

Crystal structure of 3-amino-2-ethyl-quinazolin-4(3H)-one.

Project description:The mol-ecule of the title compound, C10H11N3O, is planar, including the ethyl group, as indicated by the N-C-C-C torsion angle of 1.5 (2)°. In the crystal, inversion-related mol-ecules are stacked along the a axis. Mol-ecules are oriented head-to-tail and display π-π inter-actions with a centroid-to-centroid distance of 3.6664 (8) Å. N-H⋯O hydrogen bonds between mol-ecules generate a 'step' structure through formation of an R 2 (2)(10) ring.

| S-EPMC4555403 | biostudies-literature

3-(2-Amino-ethyl)-2-(4-fluoroanilino)-quinazolin-4(3H)-one.

Project description:In the title mol-ecule, C(16)H(15)FN(4)O, the dihedral angle between the fluoro-substituted benzene ring and the pyrimidinone ring is 52.34 (7)°, while the dihedral angle between the fused benzene ring and the pyrimidinone ring is 3.30 (6)°. An intra-molecular N-H⋯N hydrogen bond may, in part, influence the conformation of the mol-ecule. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds and weak C-H⋯π(arene) inter-actions link pairs of mol-ecules into centrosymmetric dimers.

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3-(2-Amino-ethyl)-2-(4-chloro-anilino)-quinazolin-4(3H)-one methanol 0.75-solvate.

Project description:In the asymmetric unit of the title compound, C(16)H(15)ClN(4)O·0.75CH(3)OH, there are two independent quinazolin-4(3H)-one mol-ecules and one and a half methanol mol-ecules. One of the methanol mol-ecules is disordered over two positions with equal occupancies. The dihedral angles between the quinazoline ring system and the chloro-benzene ring in the two quinazolin-4(3H)-one mol-ecules are essentially the same, at 39.83 (1) and 39.84 (1)°. Intra-molecular N-H⋯N and O-H⋯O, and inter-molecular N-H⋯O and N-H⋯N hydrogen bonds are observed. In addition, π-π stacking inter-actions, with centroid-to-centroid distances of 3.654 (1), 3.766 (1) and 3.767 (1) Å, and weak C-H⋯π inter-actions, are observed.

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2-Ethyl-3-[(R)-2-phenyl-butanamido]-quinazolin-4(3H)-one monohydrate.

Project description:In the title compound, C20H21N3O2·H2O (EQR·H2O), the quinazoline ring system forms dihedral angles of 53.1 (1) and 85.6 (1)° with the phenyl ring and the amide link, respectively. In the crystal, O-H⋯O hydrogen bonds link two EQR and two water mol-ecules into a centrosymmetric R 4 (4)(18) ring motif. N-H⋯O hydrogen bonds further link these hydrogen-bonded fragments into columns extending in [010].

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2-(5-Bromo-2-hydroxy-phen-yl)-1,2-dihydro-quinazolin-4(3H)-one.

Project description:The asymmetric unit of the title compound, C(14)H(11)BrN(2)O(2), contains two independent mol-ecules connected into a dimer by inter-molecular N-H?O hydrogen bonds involving the amine and carbonyl groups. The dimers are further connected by O-H?O hydrogen bonds, forming chains running parallel to the a axis, which are stabilized through ?-? stacking inter-actions, with a centroid-centroid distance of 3.679?(8)?Å. The dihedral angle between the two aromatic rings is 89.2?(4)°.

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Crystal structure of 3-amino-2-propyl-quinazolin-4(3H)-one.

Project description:In the title mol-ecule, C11H13N3O, the propyl group is almost perpendicular to the quinazolin-4(3H)-one mean plane, making a dihedral angle of 88.98 (9)°. In the crystal, mol-ecules related by an inversion centre are paired via π-π overlap, indicated by the short distances of 3.616 (5) and 3.619 (5) Å between the centroids of the aromatic rings of neighbouring mol-ecules. Inter-molecular N-H⋯N and N-H⋯O hydrogen bonds form R 6 (6)(30) rings and C(5) chains, respectively, generating a three-dimensional network. Weak C-H⋯O inter-actions are also observed.

| S-EPMC4571413 | biostudies-literature

2-(2-Hydroxy-ethyl-amino)-3-phenyl-1-benzofuro[3,2-d]pyrimidin-4(3H)-one dichloro-methane hemisolvate.

Project description:In the title compound, C(18)H(15)N(3)O(3)·0.5CH(2)Cl(2), the fused ring benzofuro[2,3-d]pyrimidine system is essentially planar [maximum deviation 0.029?(1)?Å]. The planes of the pyrimidinone and phenyl rings are nearly perpendicular [dihedral angle = 87.50?(14)°]. The packing of the mol-ecules in the crystal structure is governed mainly by inter-molecular O-H?O and N-H?O hydrogen-bonding inter-actions and inter-molecular ?-? inter-actions between benzofuro[3,2-d]pyrimidine units [the interplanar distances are ca 3.4 and 3.5?Å, and the distances between adjacent ring centroids are in the range 3.64?(1)-3.76?(1)?Å]. The dichloromethane solvent molecule lies on a special position.

| S-EPMC2969675 | biostudies-literature

2,3-Di-methyl-quinazolin-4(3H)-one.

Project description:The non-H atoms of the title mol-ecule, C10H10N2O, are essentially coplanar, with a maximum deviation of 0.046?(4)?Å for the O atom. In the crystal, mol-ecules are linked by weak C-H?O hydrogen bonds, forming chains along [010]. In addtion, weak C-H?? inter-actions and ?-? stacking inter-actions between benzene and pyrimidine rings, with a centroid-centroid distance of 3.730?(3)?Å, link the chains, forming a two-dimensional network parallel to (001).

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