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Ethyl 2-[(Z)-3-chloro-benzyl-idene]-7-methyl-3-oxo-5-phenyl-2,3-dihydro-5H-1,3-thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

ABSTRACT: In the title compound, C(23)H(19)ClN(2)O(3)S, the central pyrimidine ring is significantly puckered, assuming almost a screw boat conformation. In addition to the usual inter-molecular C-H?O hydrogen bonding, short intra-molecular C-H?S contacts and ?-? stacking inter-actions [centroid-centroid distance = 3.762?(2)?Å] contribute to the crystal packing.

SUBMITTER: Jotani MM

PROVIDER: S-EPMC2961005 | biostudies-literature | 2008 Mar

REPOSITORIES: biostudies-literature

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Ethyl 2-[(Z)-3-chloro-benzyl-idene]-7-methyl-3-oxo-5-phenyl-2,3-dihydro-5H-1,3-thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

Jotani Mukesh M MM Baldaniya Bharat B BB

Acta crystallographica. Section E, Structure reports online 20080329 Pt 4

In the title compound, C(23)H(19)ClN(2)O(3)S, the central pyrimidine ring is significantly puckered, assuming almost a screw boat conformation. In addition to the usual inter-molecular C-H⋯O hydrogen bonding, short intra-molecular C-H⋯S contacts and π-π stacking inter-actions [centroid-centroid distance = 3.762 (2) Å] contribute to the crystal packing. ...[more]

PMID: 21202129

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Ethyl 2-(2-acetoxy-benzyl-idene)-7-methyl-3-oxo-5-phenyl-2,3-dihydro-5H-1,3-thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

Project description:In the title mol-ecule, C(25)H(22)N(2)O(5)S, the atoms of the thia-zolopyrimidine ring system, with the exception of the phenyl-bearing C atom [deviation = 0.177?(2)?Å], are essentially planar [r.m.s deviation = 0.100?(2) °] and the mean plane of these atoms forms dihedral angles of 89.86?(10) and 7.97?(8)° with the phenyl and benzene rings, respectively. In the crystal, co-operative C-H?O and C-H?? inter-actions lead to a supra-molecular chain along the a axis. These chains are connected via ?-? inter-actions [centroid-centroid = 3.7523?(13)?Å].

| S-EPMC2983806 | biostudies-literature

Ethyl (2Z)-2-(3-methoxy-benzyl-idene)-7-methyl-3-oxo-5-phenyl-2,3-dihydro-5H-1,3-thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

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Project description:In the title compound, C(20)H(22)N(2)O(4)S, the central pyrimidine ring incorporating a chiral C atom is significantly puckered and adopts a slight boat conformation with C atom bearing the phenyl ring and the N atom opposite displaced by 0.367?(2) and 0.107?(2)?Å, respectively, from the plane formed by the remaining ring atoms. The benzene ring is positioned axially to the pyrimidine ring, making a dihedral angle of 88.99?(5)°. The thia-zole ring is essentially planar (r.m.s. deviation = 0.0033?Å). In the crystal, pairs of C-H?O inter-actions result in centrosymmetric dimers with graph-set motifs R(1) (2)(7) and R(2) (2)(8). A weak C-H?? contact is also observed.

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Project description:In the title compound, C(22)H(17)BrN(2)O(4)S, the central dihydropyrimidine ring, with a chiral C atom, is significantly puckered and adopts a half-chair conformation with the chiral C atom displaced from the mean plane of the remaining ring atoms by 0.305?(6)?Å. The hydroxy-phenyl ring is positioned axially to the pyrimidine ring and almost bisects it, the dihedral angle between the mean-planes of the two rings being 89.78?(12)°. The meth-oxy-carbonyl group is disordered over two sites with an occupancy ratio of 0.568?(5):0.432?(5), resulting in a major and a minor conformer. In the crystal, O-H?N and C-H?S inter-actions result in sheets along the c axis. The supra-molecular assembly is stabilized by ?-? stacking inter-actions between the 2-bromo-benzyl-idene and thia-zolopyrimidine rings [centroid-centroid distance = 3.632?(1)?Å]. In addition, C-H?? inter-actions are also observed in the crystal structure.

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Ethyl (Z)-2-(2-fluoro-benzyl-idene)-7-methyl-3-oxo-5-phenyl-3,5-dihydro-2H-thia-zolo[3,2-a]pyrimidine-6-carboxyl-ate.

Project description:The title compound, C(23)H(19)FN(2)O(3)S, a fused-pyrimidine derivative, displays dihedral angles between the thia-zole ring and the benzene ring and substituted benzene ring of 7.10?(14) and 3.48?(12)°, respectively. The dihydro-pyrimidine ring adopts a flattened boat conformation. The olefinic double bond is in a Z configuration.

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