organic compounds
N-Benzyl-4-hydroxy-2-methyl-1,1-dioxo-2H-1λ6,2-benzothiazine-3-carboxamide
aDepartment of Chemistry, University of Sargodha, Sargodha 40100, Pakistan, bInstitute of Chemistry, University of the Punjab, Lahore-54590, Pakistan, and cDepartment of Chemistry, The University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
*Correspondence e-mail: waseeq786@gmail.com
In the title molecule, C17H16N2O4S, the heterocyclic thiazine ring adopts a half-chair conformation, with the S and N atoms displaced by 0.546 (4) and 0.281 (4) Å, respectively, on opposite sides of the mean plane formed by the remaining ring atoms. The molecular structure is stabilized by an intramolecular O—H⋯O hydrogen bond. The two aromatic rings are inclined to one another by 42.32 (11)°. In the crystal, molecules are linked by pairs of N—H⋯O hydrogen bonds, forming inversion dimers. The dimers are linked via a series of C—H⋯O interactions, leading to the formation of a three-dimensional network.
Related literature
For the biological activity of benzothiazine derivatives, see: Lomabardino & Wiseman et al. (1972); Lazzeri et al. (2001). For the synthetic procedure, see: Siddiqui et al. (2008). For the structures of similar compounds, see: Siddiqui et al. (2008, 2009).
Experimental
Crystal data
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Refinement
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Data collection: COLLECT (Hooft, 1998); cell DENZO (Otwinowski & Minor, 1997); data reduction: SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97 .
Supporting information
10.1107/S1600536812022805/su2428sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536812022805/su2428Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536812022805/su2428Isup3.cml
For the synthesis of the title compound, 4-hydroxy-2-methyl-2H- 1,2-benzothiazine- 3-carboxylic acid methyl ester 1,1 dioxide and benzyllamine were used as the starting materials following a procedure reported earlier (Siddiqui et al., 2008). Crystals of the title compound, suitable for the X-ray crystallographic study, were grown from a mixture of ethyl acetate and methanol (1:1) at room temperature [M.p. = 466 – 467 K].
All H atoms were positioned geometrically and refined using a riding model, with O—H = 0.84 Å, N—H = 0.88 Å and C—H = 0.95, 0.98 and 0.99 Å, for aryl, methyl and methylene H-atoms, respectively, with Uiso(H) = k × Ueq(O,N,C), where k = 1.5 for OH and CH3 H atoms and = 1.2 for other H atoms.
Data collection: COLLECT (Hooft, 1998); cell
DENZO (Otwinowski & Minor, 1997); data reduction: SCALEPACK (Otwinowski & Minor, 1997); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).Fig. 1. The molecular structure of the title molecule with the atom numbering. Displacement ellipsoids are drawn at the 50% probability level. The intramolecular O-H···O hydrogen bond is shown as a dashed line. | |
Fig. 2. A view along the b axis of the crystal packing in the title compound, with the O-H···O, N—H···O and C—H···O hydrogen bonds shown as dashed lines [H atoms non-participating in hydrogen-bonding have been omitted for clarity]. |
C17H16N2O4S | Z = 2 |
Mr = 344.38 | F(000) = 360 |
Triclinic, P1 | Dx = 1.464 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.785 (3) Å | Cell parameters from 3525 reflections |
b = 9.122 (3) Å | θ = 1.0–27.5° |
c = 11.425 (4) Å | µ = 0.23 mm−1 |
α = 66.61 (2)° | T = 173 K |
β = 87.66 (2)° | Prism, colourless |
γ = 69.38 (2)° | 0.16 × 0.16 × 0.10 mm |
V = 781.2 (5) Å3 |
Nonius KappaCCD diffractometer | 3592 independent reflections |
Radiation source: fine-focus sealed tube | 3141 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.028 |
ω and ϕ scans | θmax = 27.6°, θmin = 3.3° |
Absorption correction: multi-scan (SORTAV; Blessing, 1997) | h = −10→11 |
Tmin = 0.964, Tmax = 0.977 | k = −11→11 |
6837 measured reflections | l = −14→14 |
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)] = 0.046 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.113 | H-atom parameters constrained |
S = 1.06 | w = 1/[σ2(Fo2) + (0.0393P)2 + 0.7103P] where P = (Fo2 + 2Fc2)/3 |
3592 reflections | (Δ/σ)max < 0.001 |
219 parameters | Δρmax = 0.35 e Å−3 |
0 restraints | Δρmin = −0.42 e Å−3 |
C17H16N2O4S | γ = 69.38 (2)° |
Mr = 344.38 | V = 781.2 (5) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.785 (3) Å | Mo Kα radiation |
b = 9.122 (3) Å | µ = 0.23 mm−1 |
c = 11.425 (4) Å | T = 173 K |
α = 66.61 (2)° | 0.16 × 0.16 × 0.10 mm |
β = 87.66 (2)° |
Nonius KappaCCD diffractometer | 3592 independent reflections |
Absorption correction: multi-scan (SORTAV; Blessing, 1997) | 3141 reflections with I > 2σ(I) |
Tmin = 0.964, Tmax = 0.977 | Rint = 0.028 |
6837 measured reflections |
R[F2 > 2σ(F2)] = 0.046 | 0 restraints |
wR(F2) = 0.113 | H-atom parameters constrained |
S = 1.06 | Δρmax = 0.35 e Å−3 |
3592 reflections | Δρmin = −0.42 e Å−3 |
219 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 > σ(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 | ||
S1 | 0.62867 (5) | 0.60505 (6) | 0.34904 (4) | 0.02296 (13) | |
O1 | 0.58802 (17) | 0.69700 (17) | 0.42959 (14) | 0.0283 (3) | |
O2 | 0.50059 (16) | 0.61698 (18) | 0.26852 (14) | 0.0293 (3) | |
O3 | 0.93624 (19) | 0.2725 (2) | 0.19251 (15) | 0.0345 (3) | |
H3O | 0.9365 | 0.1725 | 0.2308 | 0.052* | |
O4 | 0.88028 (17) | 0.02644 (18) | 0.36729 (14) | 0.0309 (3) | |
N1 | 0.72650 (19) | 0.40160 (19) | 0.44128 (15) | 0.0219 (3) | |
N2 | 0.71929 (19) | 0.0748 (2) | 0.51809 (16) | 0.0253 (3) | |
H2N | 0.6669 | 0.1466 | 0.5526 | 0.030* | |
C1 | 0.7810 (2) | 0.6574 (2) | 0.25555 (18) | 0.0249 (4) | |
C2 | 0.8007 (3) | 0.8122 (3) | 0.22507 (19) | 0.0296 (4) | |
H2 | 0.7324 | 0.8939 | 0.2550 | 0.036* | |
C3 | 0.9231 (3) | 0.8447 (3) | 0.1495 (2) | 0.0357 (5) | |
H3 | 0.9389 | 0.9499 | 0.1275 | 0.043* | |
C4 | 1.0220 (3) | 0.7253 (3) | 0.1060 (2) | 0.0375 (5) | |
H4 | 1.1040 | 0.7501 | 0.0534 | 0.045* | |
C5 | 1.0029 (3) | 0.5700 (3) | 0.1383 (2) | 0.0323 (5) | |
H5 | 1.0714 | 0.4889 | 0.1079 | 0.039* | |
C6 | 0.8826 (2) | 0.5329 (3) | 0.21550 (18) | 0.0262 (4) | |
C7 | 0.8691 (2) | 0.3635 (3) | 0.26145 (19) | 0.0257 (4) | |
C8 | 0.7992 (2) | 0.3010 (2) | 0.36928 (19) | 0.0235 (4) | |
C9 | 0.8009 (2) | 0.1249 (2) | 0.41831 (19) | 0.0248 (4) | |
C10 | 0.8312 (3) | 0.3639 (3) | 0.55606 (19) | 0.0291 (4) | |
H10A | 0.8803 | 0.2394 | 0.6056 | 0.035* | |
H10B | 0.7645 | 0.4172 | 0.6096 | 0.035* | |
H10C | 0.9182 | 0.4100 | 0.5288 | 0.035* | |
C11 | 0.7160 (3) | −0.0979 (2) | 0.5706 (2) | 0.0287 (4) | |
H11A | 0.8282 | −0.1813 | 0.5792 | 0.034* | |
H11B | 0.6461 | −0.1068 | 0.5098 | 0.034* | |
C12 | 0.6520 (2) | −0.1446 (2) | 0.69982 (19) | 0.0272 (4) | |
C13 | 0.6713 (3) | −0.0783 (3) | 0.7863 (2) | 0.0317 (4) | |
H13 | 0.7232 | 0.0031 | 0.7634 | 0.038* | |
C14 | 0.6155 (3) | −0.1299 (3) | 0.9056 (2) | 0.0392 (5) | |
H14 | 0.6304 | −0.0845 | 0.9641 | 0.047* | |
C15 | 0.5382 (3) | −0.2469 (3) | 0.9401 (2) | 0.0437 (6) | |
H15 | 0.4990 | −0.2810 | 1.0216 | 0.052* | |
C16 | 0.5185 (3) | −0.3139 (3) | 0.8547 (2) | 0.0411 (5) | |
H16 | 0.4660 | −0.3948 | 0.8779 | 0.049* | |
C17 | 0.5749 (3) | −0.2635 (3) | 0.7358 (2) | 0.0322 (5) | |
H17 | 0.5610 | −0.3104 | 0.6780 | 0.039* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0241 (2) | 0.0199 (2) | 0.0242 (2) | −0.00610 (17) | 0.00430 (17) | −0.01015 (18) |
O1 | 0.0335 (7) | 0.0217 (7) | 0.0312 (7) | −0.0075 (6) | 0.0082 (6) | −0.0148 (6) |
O2 | 0.0265 (7) | 0.0291 (7) | 0.0301 (7) | −0.0081 (6) | 0.0004 (6) | −0.0116 (6) |
O3 | 0.0401 (8) | 0.0339 (8) | 0.0351 (8) | −0.0121 (7) | 0.0151 (7) | −0.0218 (7) |
O4 | 0.0336 (7) | 0.0250 (7) | 0.0369 (8) | −0.0068 (6) | 0.0096 (6) | −0.0192 (6) |
N1 | 0.0251 (8) | 0.0179 (7) | 0.0232 (8) | −0.0065 (6) | 0.0040 (6) | −0.0101 (6) |
N2 | 0.0270 (8) | 0.0200 (8) | 0.0295 (9) | −0.0057 (6) | 0.0052 (7) | −0.0134 (7) |
C1 | 0.0275 (9) | 0.0249 (9) | 0.0208 (9) | −0.0096 (7) | 0.0025 (7) | −0.0081 (7) |
C2 | 0.0369 (11) | 0.0266 (10) | 0.0253 (10) | −0.0127 (8) | 0.0026 (8) | −0.0096 (8) |
C3 | 0.0484 (13) | 0.0329 (11) | 0.0288 (11) | −0.0236 (10) | 0.0048 (9) | −0.0079 (9) |
C4 | 0.0395 (12) | 0.0447 (13) | 0.0296 (11) | −0.0222 (10) | 0.0101 (9) | −0.0112 (10) |
C5 | 0.0322 (10) | 0.0371 (11) | 0.0269 (10) | −0.0121 (9) | 0.0079 (8) | −0.0132 (9) |
C6 | 0.0264 (9) | 0.0275 (10) | 0.0229 (9) | −0.0089 (8) | 0.0032 (7) | −0.0093 (8) |
C7 | 0.0228 (9) | 0.0275 (10) | 0.0284 (10) | −0.0058 (7) | 0.0040 (7) | −0.0160 (8) |
C8 | 0.0211 (8) | 0.0222 (9) | 0.0277 (9) | −0.0047 (7) | 0.0037 (7) | −0.0136 (8) |
C9 | 0.0228 (9) | 0.0228 (9) | 0.0291 (10) | −0.0054 (7) | 0.0005 (7) | −0.0132 (8) |
C10 | 0.0342 (10) | 0.0256 (10) | 0.0268 (10) | −0.0085 (8) | −0.0015 (8) | −0.0115 (8) |
C11 | 0.0334 (10) | 0.0208 (9) | 0.0329 (10) | −0.0088 (8) | 0.0039 (8) | −0.0131 (8) |
C12 | 0.0263 (9) | 0.0210 (9) | 0.0279 (10) | −0.0036 (7) | −0.0025 (8) | −0.0075 (8) |
C13 | 0.0317 (10) | 0.0290 (10) | 0.0344 (11) | −0.0085 (8) | 0.0005 (8) | −0.0150 (9) |
C14 | 0.0449 (13) | 0.0403 (13) | 0.0286 (11) | −0.0094 (10) | −0.0024 (9) | −0.0150 (10) |
C15 | 0.0461 (13) | 0.0460 (14) | 0.0266 (11) | −0.0137 (11) | 0.0029 (10) | −0.0053 (10) |
C16 | 0.0466 (13) | 0.0376 (12) | 0.0328 (12) | −0.0200 (11) | −0.0012 (10) | −0.0037 (10) |
C17 | 0.0370 (11) | 0.0266 (10) | 0.0282 (10) | −0.0102 (9) | −0.0035 (8) | −0.0072 (8) |
S1—O2 | 1.4293 (15) | C5—H5 | 0.9500 |
S1—O1 | 1.4328 (14) | C6—C7 | 1.468 (3) |
S1—N1 | 1.6404 (17) | C7—C8 | 1.359 (3) |
S1—C1 | 1.757 (2) | C8—C9 | 1.471 (3) |
O3—C7 | 1.340 (2) | C10—H10A | 0.9800 |
O3—H3O | 0.8400 | C10—H10B | 0.9800 |
O4—C9 | 1.255 (2) | C10—H10C | 0.9800 |
N1—C8 | 1.439 (2) | C11—C12 | 1.510 (3) |
N1—C10 | 1.484 (2) | C11—H11A | 0.9900 |
N2—C9 | 1.331 (3) | C11—H11B | 0.9900 |
N2—C11 | 1.457 (2) | C12—C13 | 1.390 (3) |
N2—H2N | 0.8800 | C12—C17 | 1.394 (3) |
C1—C2 | 1.387 (3) | C13—C14 | 1.385 (3) |
C1—C6 | 1.400 (3) | C13—H13 | 0.9500 |
C2—C3 | 1.391 (3) | C14—C15 | 1.382 (4) |
C2—H2 | 0.9500 | C14—H14 | 0.9500 |
C3—C4 | 1.385 (3) | C15—C16 | 1.385 (4) |
C3—H3 | 0.9500 | C15—H15 | 0.9500 |
C4—C5 | 1.385 (3) | C16—C17 | 1.383 (3) |
C4—H4 | 0.9500 | C16—H16 | 0.9500 |
C5—C6 | 1.396 (3) | C17—H17 | 0.9500 |
O2—S1—O1 | 119.07 (9) | C7—C8—C9 | 120.57 (17) |
O2—S1—N1 | 108.07 (9) | N1—C8—C9 | 117.91 (16) |
O1—S1—N1 | 107.75 (9) | O4—C9—N2 | 122.22 (18) |
O2—S1—C1 | 109.30 (9) | O4—C9—C8 | 119.70 (18) |
O1—S1—C1 | 109.51 (9) | N2—C9—C8 | 118.07 (16) |
N1—S1—C1 | 101.71 (9) | N1—C10—H10A | 109.5 |
C7—O3—H3O | 109.5 | N1—C10—H10B | 109.5 |
C8—N1—C10 | 115.28 (15) | H10A—C10—H10B | 109.5 |
C8—N1—S1 | 112.70 (13) | N1—C10—H10C | 109.5 |
C10—N1—S1 | 116.38 (12) | H10A—C10—H10C | 109.5 |
C9—N2—C11 | 120.56 (16) | H10B—C10—H10C | 109.5 |
C9—N2—H2N | 119.7 | N2—C11—C12 | 112.69 (16) |
C11—N2—H2N | 119.7 | N2—C11—H11A | 109.1 |
C2—C1—C6 | 122.04 (18) | C12—C11—H11A | 109.1 |
C2—C1—S1 | 121.72 (15) | N2—C11—H11B | 109.1 |
C6—C1—S1 | 116.23 (15) | C12—C11—H11B | 109.1 |
C1—C2—C3 | 118.22 (19) | H11A—C11—H11B | 107.8 |
C1—C2—H2 | 120.9 | C13—C12—C17 | 118.52 (19) |
C3—C2—H2 | 120.9 | C13—C12—C11 | 122.75 (18) |
C4—C3—C2 | 120.6 (2) | C17—C12—C11 | 118.69 (18) |
C4—C3—H3 | 119.7 | C14—C13—C12 | 120.5 (2) |
C2—C3—H3 | 119.7 | C14—C13—H13 | 119.7 |
C3—C4—C5 | 120.8 (2) | C12—C13—H13 | 119.7 |
C3—C4—H4 | 119.6 | C15—C14—C13 | 120.6 (2) |
C5—C4—H4 | 119.6 | C15—C14—H14 | 119.7 |
C4—C5—C6 | 119.8 (2) | C13—C14—H14 | 119.7 |
C4—C5—H5 | 120.1 | C14—C15—C16 | 119.4 (2) |
C6—C5—H5 | 120.1 | C14—C15—H15 | 120.3 |
C5—C6—C1 | 118.45 (19) | C16—C15—H15 | 120.3 |
C5—C6—C7 | 121.20 (18) | C17—C16—C15 | 120.3 (2) |
C1—C6—C7 | 120.22 (17) | C17—C16—H16 | 119.9 |
O3—C7—C8 | 122.42 (18) | C15—C16—H16 | 119.9 |
O3—C7—C6 | 115.26 (17) | C16—C17—C12 | 120.7 (2) |
C8—C7—C6 | 122.27 (17) | C16—C17—H17 | 119.6 |
C7—C8—N1 | 121.49 (17) | C12—C17—H17 | 119.6 |
O2—S1—N1—C8 | 60.59 (14) | C1—C6—C7—C8 | −20.3 (3) |
O1—S1—N1—C8 | −169.54 (12) | O3—C7—C8—N1 | −179.44 (17) |
C1—S1—N1—C8 | −54.42 (14) | C6—C7—C8—N1 | 3.3 (3) |
O2—S1—N1—C10 | −163.02 (13) | O3—C7—C8—C9 | 2.6 (3) |
O1—S1—N1—C10 | −33.15 (16) | C6—C7—C8—C9 | −174.66 (17) |
C1—S1—N1—C10 | 81.97 (15) | C10—N1—C8—C7 | −98.7 (2) |
O2—S1—C1—C2 | 106.46 (17) | S1—N1—C8—C7 | 38.2 (2) |
O1—S1—C1—C2 | −25.63 (19) | C10—N1—C8—C9 | 79.3 (2) |
N1—S1—C1—C2 | −139.44 (17) | S1—N1—C8—C9 | −143.81 (14) |
O2—S1—C1—C6 | −74.54 (17) | C11—N2—C9—O4 | −1.5 (3) |
O1—S1—C1—C6 | 153.38 (15) | C11—N2—C9—C8 | 179.79 (17) |
N1—S1—C1—C6 | 39.56 (17) | C7—C8—C9—O4 | 6.6 (3) |
C6—C1—C2—C3 | 1.7 (3) | N1—C8—C9—O4 | −171.38 (17) |
S1—C1—C2—C3 | −179.35 (16) | C7—C8—C9—N2 | −174.66 (18) |
C1—C2—C3—C4 | 0.1 (3) | N1—C8—C9—N2 | 7.3 (3) |
C2—C3—C4—C5 | −0.9 (3) | C9—N2—C11—C12 | 166.82 (17) |
C3—C4—C5—C6 | 0.0 (3) | N2—C11—C12—C13 | −30.1 (3) |
C4—C5—C6—C1 | 1.7 (3) | N2—C11—C12—C17 | 152.07 (18) |
C4—C5—C6—C7 | −174.19 (19) | C17—C12—C13—C14 | 0.2 (3) |
C2—C1—C6—C5 | −2.6 (3) | C11—C12—C13—C14 | −177.66 (19) |
S1—C1—C6—C5 | 178.41 (15) | C12—C13—C14—C15 | −0.6 (3) |
C2—C1—C6—C7 | 173.33 (18) | C13—C14—C15—C16 | 0.7 (4) |
S1—C1—C6—C7 | −5.7 (2) | C14—C15—C16—C17 | −0.3 (4) |
C5—C6—C7—O3 | −21.9 (3) | C15—C16—C17—C12 | −0.1 (3) |
C1—C6—C7—O3 | 162.27 (18) | C13—C12—C17—C16 | 0.2 (3) |
C5—C6—C7—C8 | 155.6 (2) | C11—C12—C17—C16 | 178.1 (2) |
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3O···O4 | 0.84 | 1.79 | 2.531 (2) | 146 |
N2—H2N···O1i | 0.88 | 2.24 | 2.980 (2) | 141 |
C10—H10A···O4ii | 0.98 | 2.50 | 3.349 (3) | 144 |
C11—H11B···O1iii | 0.99 | 2.51 | 3.374 (3) | 146 |
C15—H15···O2iv | 0.95 | 2.59 | 3.496 (3) | 158 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+2, −y, −z+1; (iii) x, y−1, z; (iv) x, y−1, z+1. |
Experimental details
Crystal data | |
Chemical formula | C17H16N2O4S |
Mr | 344.38 |
Crystal system, space group | Triclinic, P1 |
Temperature (K) | 173 |
a, b, c (Å) | 8.785 (3), 9.122 (3), 11.425 (4) |
α, β, γ (°) | 66.61 (2), 87.66 (2), 69.38 (2) |
V (Å3) | 781.2 (5) |
Z | 2 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.16 × 0.16 × 0.10 |
Data collection | |
Diffractometer | Nonius KappaCCD diffractometer |
Absorption correction | Multi-scan (SORTAV; Blessing, 1997) |
Tmin, Tmax | 0.964, 0.977 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 6837, 3592, 3141 |
Rint | 0.028 |
(sin θ/λ)max (Å−1) | 0.653 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.046, 0.113, 1.06 |
No. of reflections | 3592 |
No. of parameters | 219 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.35, −0.42 |
Computer programs: COLLECT (Hooft, 1998), DENZO (Otwinowski & Minor, 1997), SCALEPACK (Otwinowski & Minor, 1997), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997).
D—H···A | D—H | H···A | D···A | D—H···A |
O3—H3O···O4 | 0.84 | 1.79 | 2.531 (2) | 146 |
N2—H2N···O1i | 0.88 | 2.24 | 2.980 (2) | 141 |
C10—H10A···O4ii | 0.98 | 2.50 | 3.349 (3) | 144 |
C11—H11B···O1iii | 0.99 | 2.51 | 3.374 (3) | 146 |
C15—H15···O2iv | 0.95 | 2.59 | 3.496 (3) | 158 |
Symmetry codes: (i) −x+1, −y+1, −z+1; (ii) −x+2, −y, −z+1; (iii) x, y−1, z; (iv) x, y−1, z+1. |
Acknowledgements
The authors thank the Higher Education Commission (HEC), Islamabad, Pakistan, for providing funds for this research.
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1,2-Benzothiazine 1,1 dioxides have received much attention since the discovery of 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxamides 1,1-dioxides as potent anti-inflammatory and analgesic agents (Lomabardino & Wiseman, 1972). Benzothiazine based derivatives have also shown activities for the treatment of asthmatic therapy (Lazzeri et al., 2001). In continuation of our interest in the synthesis and crystal structures of 1,2-benzothiazine derivatives (Siddiqui et al., 2008; 2009) we report herein on the crystal structure of the title compound.
The bond distances and angles in the title compound (Fig. 1) agree very well with the corresponding bond distances and angles reported for closely related compounds (Siddiqui et al., 2008; 2009). The heterocyclic thiazine ring adopts a half chair conformation with atoms S1 and N1 displaced by 0.546 (4) and 0.281 (4) Å, respectively, on the opposite sides from the mean plane formed by the remaining ring atoms. The molecular structure is stabilized by an intramolecular O3—H3O···O4 hydrogen bond (Table 1). The aromatic rings [C1-C6 and C12-C17] are inclined to one another by 42.32 (11)°.
In the crystal, molecules are linked by a pair of N—H···O hydrogen bonds to form inversion dimers. The dimers are linked via a series of C—H···O interactions leading to the formation of a three-dimensional network. (Fig. 2 and Table 1).