organic compounds
Methyl 2-(2-bromobenzylidene)-5-(4-hydroxyphenyl)-7-methyl-3-oxo-2,3-dihydro-5H-1,3-thiazolo[3,2-a]pyrimidine-6-carboxylate
aDepartment of Studies in Chemistry, Bangalore University, Bangalore 560 001, Karnataka, India
*Correspondence e-mail: noorsb@rediffmail.com
In the title compound, C22H17BrN2O4S, 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 methoxycarbonyl 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 interactions result in sheets along the c axis. The supramolecular assembly is stabilized by π–π stacking interactions between the 2-bromobenzylidene and thiazolopyrimidine rings [centroid–centroid distance = 3.632 (1) Å]. In addition, C—H⋯π interactions are also observed in the crystal structure.
Related literature
For therapeutic and medicinal properties of thiazolopyrimidine derivatives, see: Kappe (2000); Ozair et al. (2010). For a related structure, see: Nagarajaiah & Begum (2011).
Experimental
Crystal data
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Refinement
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Data collection: SMART (Bruker, 1998); cell SAINT-Plus (Bruker, 1998); data reduction: SAINT-Plus; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1996); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
10.1107/S1600536812013311/pv2521sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812013311/pv2521Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812013311/pv2521Isup3.cml
A mixture of 4-(4-hydroxy-phenyl)-6-methyl-2-thioxo-1,2,3, 4-tetrahydro-pyrimidine-5-carboxylic acid methyl ester (0.01 mol), chloroaceticacid (0.01 mol), 2-bromo benzaldehyde (0.01 mol) and sodium acetate (1.5 g) was taken in a mixture of glacial acetic acid and acetic anhydride (25 ml; 1:1) and refluxed for 10 hr. The reaction mixture was concentrated and the solid thus obtained was filtered and recrystallized with ethyl acetate to get the title compound (yield = 78%, m.p. 468–470 K). The compound was recrystallized by slow evaporation of an ethyl acetate-ethanol (6:4) solution, yielding pale yellow single crystals suitable for X-ray diffraction.
The H atoms were placed at calculated positions in the riding model approximation with O—H = 0.82 Å and C—H = 0.93, 0.96 and 0.98 Å for aryl, methyl and methyne H-atoms respectively, with Uiso(H) = 1.5Ueq(C) for methyl H atoms and 1.2Ueq(C/O) for other H atom.
The title compound is a representative of thiazolopyrimidine derivatives, which have recently emerged as target molecules due to their therapeutic and medicinal properties (Kappe, 2000) such as anti-inflammatory and antinociceptive activities (Ozair et al. 2010) in addition to being calcium channel blockers.
In the title molecule (Fig. 1), the 4-hydroxy-phenyl group adopts a psuedo π—π stacking interactions between the thiazolopyrimidine and 2-bromo-benzylidene rings. The C3···C21 (x - 1, y, z - 1) disposed at a distance of 3.632 (1) Å. In addition C1—H1···Cg1 interactions (Cg1 being the centroid of the benzene ring C10–C15, Table 1) are also observed. The bond lengths and angles in the title molecule are in close agreement with the corresponding bond lengths and angles reported in a similar compound (Nagarajaiah & Begum, 2011).
conformation with respect to C5—H5 bond. The central pyrimidine ring with a chiral C5 atom is significantly puckered and adopts a half chair conformation with C5 displaced from the mean plane of the remaining ring atoms (C6/C7/C9//N2/N1) by 0.305 (6) Å. The hydroxy-phenyl ring is positioned axially to the pyrimidine ring and almost bisects it with a dihedral angle between the mean-planes of the two rings being 89.78 (12)°. The methoxycarbonyl group in the title compound is disordered in which the carbon atoms C8, C4 and the oxygen atoms O2 and O3 are located over two sites (C8A/C8B,C4A/C4B, O2A/O2B and O3A/O3B) with site occupancy ratio 0.568 (5):0.432 (5) resulting in a major and a minor conformers. The is primarily stabilized by intermolecular O4—H4···N2 and C4B—H4B1···S1 interactions which result in two dimensional sheets along the c-axis (Fig. 2). The molecular packing is further stabilized byFor therapeutic and medicinal properties of thiazolopyrimidine derivatives, see: Kappe (2000); Ozair et al. (2010). For a related structure, see: Nagarajaiah & Begum (2011).
Data collection: SMART (Bruker, 1998); cell
SAINT-Plus (Bruker, 1998); data reduction: SAINT-Plus (Bruker, 1998); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1996); software used to prepare material for publication: WinGX (Farrugia, 1999).C22H17BrN2O4S | F(000) = 984 |
Mr = 485.35 | Dx = 1.589 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 4409 reflections |
a = 9.851 (2) Å | θ = 2.2–27.0° |
b = 23.461 (6) Å | µ = 2.16 mm−1 |
c = 9.416 (2) Å | T = 296 K |
β = 111.229 (5)° | Block, yellow |
V = 2028.5 (8) Å3 | 0.18 × 0.16 × 0.16 mm |
Z = 4 |
Bruker SMART APEX CCD detector diffractometer | 4409 independent reflections |
Radiation source: fine-focus sealed tube | 2563 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.054 |
ω scans | θmax = 27.0°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS, Bruker, 1998) | h = −12→7 |
Tmin = 0.697, Tmax = 0.724 | k = −28→29 |
12267 measured reflections | l = −11→12 |
Refinement on F2 | Primary atom site location: structure-invariant direct methods |
Least-squares matrix: full | Secondary atom site location: difference Fourier map |
R[F2 > 2σ(F2)] = 0.059 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.178 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0878P)2] where P = (Fo2 + 2Fc2)/3 |
4409 reflections | (Δ/σ)max < 0.001 |
286 parameters | Δρmax = 1.04 e Å−3 |
0 restraints | Δρmin = −0.87 e Å−3 |
C22H17BrN2O4S | V = 2028.5 (8) Å3 |
Mr = 485.35 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 9.851 (2) Å | µ = 2.16 mm−1 |
b = 23.461 (6) Å | T = 296 K |
c = 9.416 (2) Å | 0.18 × 0.16 × 0.16 mm |
β = 111.229 (5)° |
Bruker SMART APEX CCD detector diffractometer | 4409 independent reflections |
Absorption correction: multi-scan (SADABS, Bruker, 1998) | 2563 reflections with I > 2σ(I) |
Tmin = 0.697, Tmax = 0.724 | Rint = 0.054 |
12267 measured reflections |
R[F2 > 2σ(F2)] = 0.059 | 0 restraints |
wR(F2) = 0.178 | H-atom parameters constrained |
S = 1.04 | Δρmax = 1.04 e Å−3 |
4409 reflections | Δρmin = −0.87 e Å−3 |
286 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. |
Refinement. Refinement of F2 against ALL reflections. The weighted R-factor wR and goodness of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The threshold expression of F2 > 2σ(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | Occ. (<1) | |
Br1 | 0.94209 (7) | 0.12175 (2) | 0.43004 (8) | 0.0693 (3) | |
S1 | 0.69429 (13) | −0.08352 (5) | 0.61655 (13) | 0.0406 (3) | |
O1 | 0.5280 (4) | −0.00179 (13) | 0.2404 (4) | 0.0585 (10) | |
O4 | 0.6120 (3) | −0.20100 (12) | −0.1933 (3) | 0.0375 (7) | |
H4 | 0.5719 | −0.1881 | −0.2794 | 0.056* | |
N1 | 0.4855 (4) | −0.08217 (14) | 0.3536 (4) | 0.0380 (9) | |
N2 | 0.4767 (4) | −0.15870 (15) | 0.5130 (4) | 0.0376 (9) | |
C1 | 0.2725 (5) | −0.2232 (2) | 0.4575 (6) | 0.0498 (12) | |
H1A | 0.1688 | −0.2180 | 0.4190 | 0.075* | |
H1B | 0.3083 | −0.2233 | 0.5668 | 0.075* | |
H1C | 0.2955 | −0.2589 | 0.4216 | 0.075* | |
C2 | 0.6896 (5) | −0.02716 (17) | 0.4936 (5) | 0.0395 (11) | |
C3 | 0.5627 (6) | −0.03336 (18) | 0.3500 (5) | 0.0430 (12) | |
C5 | 0.3714 (5) | −0.1052 (2) | 0.2168 (5) | 0.0434 (12) | |
H5 | 0.3047 | −0.0741 | 0.1666 | 0.052* | |
C6 | 0.2857 (5) | −0.1505 (2) | 0.2668 (5) | 0.0455 (12) | |
C7 | 0.3424 (5) | −0.17558 (19) | 0.4030 (5) | 0.0406 (11) | |
C9 | 0.5358 (5) | −0.11320 (17) | 0.4837 (5) | 0.0348 (10) | |
C10 | 0.4374 (5) | −0.12880 (17) | 0.1052 (5) | 0.0374 (10) | |
C11 | 0.5353 (5) | −0.17425 (18) | 0.1479 (5) | 0.0379 (10) | |
H11 | 0.5612 | −0.1893 | 0.2456 | 0.045* | |
C12 | 0.5942 (5) | −0.19733 (17) | 0.0490 (5) | 0.0348 (10) | |
H12 | 0.6610 | −0.2270 | 0.0803 | 0.042* | |
C13 | 0.5535 (5) | −0.17610 (17) | −0.0963 (5) | 0.0347 (10) | |
C14 | 0.4570 (5) | −0.13072 (17) | −0.1407 (5) | 0.0387 (11) | |
H14 | 0.4306 | −0.1158 | −0.2386 | 0.046* | |
C15 | 0.4003 (6) | −0.1078 (2) | −0.0394 (5) | 0.0466 (12) | |
H15 | 0.3356 | −0.0774 | −0.0699 | 0.056* | |
C16 | 0.7832 (6) | 0.01649 (18) | 0.5097 (6) | 0.0474 (13) | |
H16 | 0.7560 | 0.0414 | 0.4274 | 0.057* | |
C17 | 0.9172 (6) | 0.03188 (19) | 0.6303 (6) | 0.0490 (13) | |
C18 | 0.9740 (6) | 0.0014 (2) | 0.7658 (6) | 0.0521 (13) | |
H18 | 0.9223 | −0.0296 | 0.7817 | 0.063* | |
C19 | 1.1042 (6) | 0.0158 (2) | 0.8764 (7) | 0.0606 (15) | |
H19 | 1.1399 | −0.0052 | 0.9660 | 0.073* | |
C20 | 1.1822 (6) | 0.0617 (3) | 0.8549 (8) | 0.0702 (18) | |
H20 | 1.2711 | 0.0711 | 0.9295 | 0.084* | |
C21 | 1.1297 (7) | 0.0930 (2) | 0.7252 (8) | 0.0658 (17) | |
H21 | 1.1810 | 0.1246 | 0.7121 | 0.079* | |
C22 | 1.0006 (6) | 0.0778 (2) | 0.6137 (7) | 0.0571 (15) | |
O2A | 0.0777 (8) | −0.2032 (3) | 0.1381 (8) | 0.0398 (15) | 0.568 (5) |
O3A | 0.1029 (9) | −0.1203 (3) | 0.0273 (9) | 0.0478 (18) | 0.568 (5) |
C8A | 0.1483 (11) | −0.1543 (4) | 0.1338 (13) | 0.0344 (18) | 0.568 (5) |
C4A | −0.0570 (9) | −0.2119 (4) | 0.0135 (11) | 0.055 (2) | 0.568 (5) |
H4A1 | −0.0980 | −0.2479 | 0.0256 | 0.083* | 0.568 (5) |
H4A2 | −0.0397 | −0.2118 | −0.0805 | 0.083* | 0.568 (5) |
H4A3 | −0.1237 | −0.1818 | 0.0119 | 0.083* | 0.568 (5) |
O2B | 0.0944 (12) | −0.1436 (4) | 0.0420 (13) | 0.0398 (15) | 0.432 (5) |
O3B | 0.0726 (12) | −0.2187 (4) | 0.1889 (12) | 0.0478 (18) | 0.432 (5) |
C8B | 0.1406 (17) | −0.1798 (6) | 0.1675 (17) | 0.0344 (18) | 0.432 (5) |
C4B | −0.0390 (12) | −0.1602 (5) | −0.0732 (13) | 0.055 (2) | 0.432 (5) |
H4B1 | −0.0667 | −0.1323 | −0.1532 | 0.083* | 0.432 (5) |
H4B2 | −0.1135 | −0.1629 | −0.0302 | 0.083* | 0.432 (5) |
H4B3 | −0.0269 | −0.1966 | −0.1139 | 0.083* | 0.432 (5) |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br1 | 0.0943 (5) | 0.0404 (3) | 0.1033 (6) | −0.0081 (3) | 0.0720 (4) | −0.0062 (3) |
S1 | 0.0530 (7) | 0.0361 (6) | 0.0348 (6) | −0.0079 (5) | 0.0185 (5) | −0.0037 (5) |
O1 | 0.089 (3) | 0.0330 (17) | 0.056 (2) | 0.0130 (18) | 0.029 (2) | 0.0096 (17) |
O4 | 0.0459 (19) | 0.0332 (16) | 0.0337 (16) | 0.0035 (13) | 0.0147 (15) | −0.0014 (13) |
N1 | 0.050 (2) | 0.0355 (19) | 0.030 (2) | 0.0093 (17) | 0.0166 (17) | −0.0013 (16) |
N2 | 0.044 (2) | 0.041 (2) | 0.0301 (19) | −0.0043 (18) | 0.0160 (17) | −0.0071 (16) |
C1 | 0.043 (3) | 0.051 (3) | 0.060 (3) | −0.008 (2) | 0.025 (2) | −0.016 (3) |
C2 | 0.061 (3) | 0.026 (2) | 0.041 (3) | 0.004 (2) | 0.031 (2) | −0.0029 (19) |
C3 | 0.066 (3) | 0.023 (2) | 0.049 (3) | 0.011 (2) | 0.031 (3) | −0.002 (2) |
C5 | 0.049 (3) | 0.041 (2) | 0.036 (3) | 0.015 (2) | 0.010 (2) | 0.000 (2) |
C6 | 0.038 (3) | 0.054 (3) | 0.043 (3) | 0.009 (2) | 0.013 (2) | −0.017 (2) |
C7 | 0.043 (3) | 0.040 (2) | 0.045 (3) | 0.004 (2) | 0.023 (2) | −0.010 (2) |
C9 | 0.044 (3) | 0.034 (2) | 0.030 (2) | 0.006 (2) | 0.019 (2) | −0.0039 (19) |
C10 | 0.045 (3) | 0.031 (2) | 0.033 (2) | 0.0082 (19) | 0.011 (2) | −0.0016 (18) |
C11 | 0.048 (3) | 0.037 (2) | 0.028 (2) | 0.007 (2) | 0.012 (2) | 0.0058 (19) |
C12 | 0.041 (3) | 0.029 (2) | 0.035 (2) | 0.0046 (19) | 0.014 (2) | 0.0005 (18) |
C13 | 0.042 (3) | 0.030 (2) | 0.033 (2) | −0.0039 (19) | 0.016 (2) | −0.0048 (18) |
C14 | 0.052 (3) | 0.034 (2) | 0.029 (2) | 0.005 (2) | 0.014 (2) | 0.0027 (19) |
C15 | 0.064 (3) | 0.041 (2) | 0.031 (2) | 0.021 (2) | 0.012 (2) | 0.004 (2) |
C16 | 0.069 (4) | 0.024 (2) | 0.061 (3) | 0.004 (2) | 0.038 (3) | −0.005 (2) |
C17 | 0.058 (3) | 0.030 (2) | 0.071 (4) | −0.003 (2) | 0.038 (3) | −0.015 (2) |
C18 | 0.062 (3) | 0.037 (3) | 0.063 (3) | −0.010 (2) | 0.030 (3) | −0.016 (3) |
C19 | 0.066 (4) | 0.052 (3) | 0.063 (4) | 0.004 (3) | 0.023 (3) | −0.014 (3) |
C20 | 0.055 (4) | 0.071 (4) | 0.091 (5) | −0.017 (3) | 0.035 (3) | −0.050 (4) |
C21 | 0.081 (5) | 0.049 (3) | 0.092 (5) | −0.014 (3) | 0.060 (4) | −0.031 (3) |
C22 | 0.069 (4) | 0.037 (3) | 0.086 (4) | −0.008 (3) | 0.053 (3) | −0.023 (3) |
O2A | 0.031 (3) | 0.038 (4) | 0.048 (3) | −0.006 (3) | 0.012 (3) | 0.003 (3) |
O3A | 0.055 (4) | 0.027 (3) | 0.055 (4) | −0.004 (3) | 0.013 (3) | 0.002 (3) |
C8A | 0.037 (4) | 0.019 (5) | 0.045 (5) | 0.015 (5) | 0.013 (4) | 0.001 (5) |
C4A | 0.036 (4) | 0.057 (4) | 0.063 (5) | 0.000 (3) | 0.006 (4) | 0.013 (4) |
O2B | 0.031 (3) | 0.038 (4) | 0.048 (3) | −0.006 (3) | 0.012 (3) | 0.003 (3) |
O3B | 0.055 (4) | 0.027 (3) | 0.055 (4) | −0.004 (3) | 0.013 (3) | 0.002 (3) |
C8B | 0.037 (4) | 0.019 (5) | 0.045 (5) | 0.015 (5) | 0.013 (4) | 0.001 (5) |
C4B | 0.036 (4) | 0.057 (4) | 0.063 (5) | 0.000 (3) | 0.006 (4) | 0.013 (4) |
Br1—C22 | 1.915 (6) | C13—C14 | 1.387 (6) |
S1—C2 | 1.747 (4) | C14—C15 | 1.377 (7) |
S1—C9 | 1.753 (5) | C14—H14 | 0.9300 |
O1—C3 | 1.215 (5) | C15—H15 | 0.9300 |
O4—C13 | 1.374 (5) | C16—C17 | 1.441 (7) |
O4—H4 | 0.8200 | C16—H16 | 0.9300 |
N1—C9 | 1.355 (5) | C17—C18 | 1.392 (7) |
N1—C3 | 1.382 (6) | C17—C22 | 1.397 (7) |
N1—C5 | 1.472 (6) | C18—C19 | 1.370 (7) |
N2—C9 | 1.293 (5) | C18—H18 | 0.9300 |
N2—C7 | 1.410 (6) | C19—C20 | 1.378 (8) |
C1—C7 | 1.497 (6) | C19—H19 | 0.9300 |
C1—H1A | 0.9600 | C20—C21 | 1.357 (9) |
C1—H1B | 0.9600 | C20—H20 | 0.9300 |
C1—H1C | 0.9600 | C21—C22 | 1.371 (8) |
C2—C16 | 1.349 (6) | C21—H21 | 0.9300 |
C2—C3 | 1.479 (7) | O2A—C8A | 1.348 (11) |
C5—C10 | 1.527 (6) | O2A—C4A | 1.432 (11) |
C5—C6 | 1.534 (7) | O3A—C8A | 1.232 (12) |
C5—H5 | 0.9800 | C4A—H4A1 | 0.9600 |
C6—C7 | 1.336 (7) | C4A—H4A2 | 0.9600 |
C6—C8A | 1.477 (12) | C4A—H4A3 | 0.9600 |
C6—C8B | 1.556 (17) | O2B—C8B | 1.391 (17) |
C10—C15 | 1.367 (6) | O2B—C4B | 1.423 (15) |
C10—C11 | 1.396 (6) | O3B—C8B | 1.192 (17) |
C11—C12 | 1.374 (6) | C4B—H4B1 | 0.9600 |
C11—H11 | 0.9300 | C4B—H4B2 | 0.9600 |
C12—C13 | 1.373 (6) | C4B—H4B3 | 0.9600 |
C12—H12 | 0.9300 | ||
C2—S1—C9 | 91.4 (2) | C15—C14—C13 | 119.7 (4) |
C13—O4—H4 | 109.5 | C15—C14—H14 | 120.1 |
C9—N1—C3 | 116.3 (4) | C13—C14—H14 | 120.1 |
C9—N1—C5 | 120.5 (4) | C10—C15—C14 | 121.3 (4) |
C3—N1—C5 | 122.4 (4) | C10—C15—H15 | 119.3 |
C9—N2—C7 | 116.8 (4) | C14—C15—H15 | 119.3 |
C7—C1—H1A | 109.5 | C2—C16—C17 | 132.3 (5) |
C7—C1—H1B | 109.5 | C2—C16—H16 | 113.9 |
H1A—C1—H1B | 109.5 | C17—C16—H16 | 113.9 |
C7—C1—H1C | 109.5 | C18—C17—C22 | 116.2 (5) |
H1A—C1—H1C | 109.5 | C18—C17—C16 | 122.8 (5) |
H1B—C1—H1C | 109.5 | C22—C17—C16 | 120.9 (5) |
C16—C2—C3 | 119.6 (4) | C19—C18—C17 | 121.6 (5) |
C16—C2—S1 | 130.3 (4) | C19—C18—H18 | 119.2 |
C3—C2—S1 | 110.0 (3) | C17—C18—H18 | 119.2 |
O1—C3—N1 | 122.6 (5) | C18—C19—C20 | 120.0 (6) |
O1—C3—C2 | 127.0 (4) | C18—C19—H19 | 120.0 |
N1—C3—C2 | 110.5 (4) | C20—C19—H19 | 120.0 |
N1—C5—C10 | 110.8 (4) | C21—C20—C19 | 120.3 (6) |
N1—C5—C6 | 108.5 (4) | C21—C20—H20 | 119.9 |
C10—C5—C6 | 112.2 (4) | C19—C20—H20 | 119.9 |
N1—C5—H5 | 108.4 | C20—C21—C22 | 119.5 (6) |
C10—C5—H5 | 108.4 | C20—C21—H21 | 120.2 |
C6—C5—H5 | 108.4 | C22—C21—H21 | 120.3 |
C7—C6—C8A | 136.4 (6) | C21—C22—C17 | 122.4 (6) |
C7—C6—C5 | 121.0 (4) | C21—C22—Br1 | 116.3 (4) |
C8A—C6—C5 | 102.7 (5) | C17—C22—Br1 | 121.3 (4) |
C7—C6—C8B | 110.8 (7) | C8A—O2A—C4A | 115.6 (8) |
C5—C6—C8B | 127.6 (7) | O3A—C8A—O2A | 122.4 (10) |
C6—C7—N2 | 122.4 (4) | O3A—C8A—C6 | 127.0 (9) |
C6—C7—C1 | 125.0 (5) | O2A—C8A—C6 | 110.5 (8) |
N2—C7—C1 | 112.6 (4) | O2A—C4A—H4A1 | 109.5 |
N2—C9—N1 | 126.2 (4) | O2A—C4A—H4A2 | 109.5 |
N2—C9—S1 | 122.0 (3) | H4A1—C4A—H4A2 | 109.5 |
N1—C9—S1 | 111.8 (3) | O2A—C4A—H4A3 | 109.5 |
C15—C10—C11 | 118.0 (4) | H4A1—C4A—H4A3 | 109.5 |
C15—C10—C5 | 121.9 (4) | H4A2—C4A—H4A3 | 109.5 |
C11—C10—C5 | 120.1 (4) | C8B—O2B—C4B | 114.1 (10) |
C12—C11—C10 | 121.5 (4) | O3B—C8B—O2B | 125.5 (14) |
C12—C11—H11 | 119.2 | O3B—C8B—C6 | 133.4 (12) |
C10—C11—H11 | 119.2 | O2B—C8B—C6 | 100.8 (10) |
C13—C12—C11 | 119.3 (4) | O2B—C4B—H4B1 | 109.5 |
C13—C12—H12 | 120.3 | O2B—C4B—H4B2 | 109.5 |
C11—C12—H12 | 120.3 | H4B1—C4B—H4B2 | 109.5 |
C12—C13—O4 | 117.8 (4) | O2B—C4B—H4B3 | 109.5 |
C12—C13—C14 | 120.0 (4) | H4B1—C4B—H4B3 | 109.5 |
O4—C13—C14 | 122.2 (4) | H4B2—C4B—H4B3 | 109.5 |
Cg1 is the centroid of the C10–C15 benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O4—H4···N2i | 0.82 | 1.96 | 2.782 (4) | 178 |
C4B—H4B1···S1ii | 0.96 | 2.80 | 3.621 (12) | 144 |
C1—H1C···Cg1iii | 0.96 | 2.78 | 3.585 (5) | 142 |
Symmetry codes: (i) x, y, z−1; (ii) x−1, y, z−1; (iii) x−1, −y−1/2, z−3/2. |
Experimental details
Crystal data | |
Chemical formula | C22H17BrN2O4S |
Mr | 485.35 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 9.851 (2), 23.461 (6), 9.416 (2) |
β (°) | 111.229 (5) |
V (Å3) | 2028.5 (8) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 2.16 |
Crystal size (mm) | 0.18 × 0.16 × 0.16 |
Data collection | |
Diffractometer | Bruker SMART APEX CCD detector |
Absorption correction | Multi-scan (SADABS, Bruker, 1998) |
Tmin, Tmax | 0.697, 0.724 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12267, 4409, 2563 |
Rint | 0.054 |
(sin θ/λ)max (Å−1) | 0.639 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.059, 0.178, 1.04 |
No. of reflections | 4409 |
No. of parameters | 286 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 1.04, −0.87 |
Computer programs: SMART (Bruker, 1998), SAINT-Plus (Bruker, 1998), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997) and CAMERON (Watkin et al., 1996), WinGX (Farrugia, 1999).
Cg1 is the centroid of the C10–C15 benzene ring. |
D—H···A | D—H | H···A | D···A | D—H···A |
O4—H4···N2i | 0.82 | 1.96 | 2.782 (4) | 178 |
C4B—H4B1···S1ii | 0.96 | 2.80 | 3.621 (12) | 144 |
C1—H1C···Cg1iii | 0.96 | 2.78 | 3.585 (5) | 142 |
Symmetry codes: (i) x, y, z−1; (ii) x−1, y, z−1; (iii) x−1, −y−1/2, z−3/2. |
Acknowledgements
NSB is thankful to the University Grants Commission (UGC), India, for financial assistance.
References
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
The title compound is a representative of thiazolopyrimidine derivatives, which have recently emerged as target molecules due to their therapeutic and medicinal properties (Kappe, 2000) such as anti-inflammatory and antinociceptive activities (Ozair et al. 2010) in addition to being calcium channel blockers.
In the title molecule (Fig. 1), the 4-hydroxy-phenyl group adopts a psuedo synperiplanar conformation with respect to C5—H5 bond. The central pyrimidine ring with a chiral C5 atom is significantly puckered and adopts a half chair conformation with C5 displaced from the mean plane of the remaining ring atoms (C6/C7/C9//N2/N1) by 0.305 (6) Å. The hydroxy-phenyl ring is positioned axially to the pyrimidine ring and almost bisects it with a dihedral angle between the mean-planes of the two rings being 89.78 (12)°. The methoxycarbonyl group in the title compound is disordered in which the carbon atoms C8, C4 and the oxygen atoms O2 and O3 are located over two sites (C8A/C8B,C4A/C4B, O2A/O2B and O3A/O3B) with site occupancy ratio 0.568 (5):0.432 (5) resulting in a major and a minor conformers. The crystal structure is primarily stabilized by intermolecular O4—H4···N2 and C4B—H4B1···S1 interactions which result in two dimensional sheets along the c-axis (Fig. 2). The molecular packing is further stabilized by π—π stacking interactions between the thiazolopyrimidine and 2-bromo-benzylidene rings. The C3···C21 (x - 1, y, z - 1) disposed at a distance of 3.632 (1) Å. In addition C1—H1···Cg1 interactions (Cg1 being the centroid of the benzene ring C10–C15, Table 1) are also observed. The bond lengths and angles in the title molecule are in close agreement with the corresponding bond lengths and angles reported in a similar compound (Nagarajaiah & Begum, 2011).