organic compounds
Methyl 2-methyl-4-(oxiran-2-ylmethoxy)-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide
aInstitute of Chemistry, University of the Punjab, Lahore 54590, Pakistan, bApplied Chemistry Research Centre, PCSIR Laboratories Complex, Ferozpure Road, Lahore 54600, Pakistan, and cChemistry Department, Loughborough University, Loughborough, Leicestershire LE11 3TU, England
*Correspondence e-mail: rehman_pcsir@hotmail.com
In the title compound, C14H15NO6S, the thiazine ring adopts a distorted half-chair conformation. The structure displays several cooperative weak intermolecular C—H⋯O hydrogen-bonding interactions, giving rise to a two-dimensional sheet packing motif. The CH2 group in the methoxy linker to the oxirane ring, and the CH group in that ring, exhibit twofold positional disorder. The three-membered oxirane ring is twisted approximately perpendicular with respect to thiazine ring (dihedral angle = 60/86° for the major/minor disorder components). 1,2-Benzothiazines of this kind have a wide range of biological activities and are mainly used as medicines in the treatment of inflammation and rheumatoid arthritis.
Related literature
For the synthesis of related molecules, see: Zia-ur-Rehman et al. (2006, 2007, 2009). For the biological activity of 1,2-benzothiazine 1,1-dioxides, see: Bihovsky et al. (2004); Fabiola et al. (1998); Kojić-Prodić & Rużić-Toroš (1982). For similar molecules, see: Ahmad et al. (2008); Arshad et al. (2009). For reference bond-length data, see: Weast et al. (1984).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2007); cell SAINT (Bruker, 2007); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL and local programs.
Supporting information
https://doi.org/10.1107/S1600536810000668/bt5151sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810000668/bt5151Isup2.hkl
A mixture of methyl 4-hydroxy-2-methyl-2H-1,2-benzothiazine-3-carboxylate 1,1-dioxide (1.33 g, 5.0 mmol), 1-chloro-2,3-epoxypropane (2.313 g, 25.0 mmol), anhydrous potassium carbonate (10.0 g) and acetonitrile (100 ml) was stirred and refluxed for a period of 7 h. After removal of acetonitrile and excess 1-chloro-2,3-epoxypropane under vacuum, chloroform (30 ml) was added and the resultant mixture was filtered. The filtrate was washed with water to remove potassium carbonate, dried with anhydrous sodium sulfate and filtered. Slow evaporation of the solvent afforded the crystalline product.
H atoms were refined using a riding model with Ueq set to be 1.2 times that of the
(1.5 times for methyl H, and refined with rotational freedom). Atoms C14, C15, and that H atoms on C16 were refined over two sets of positions with major occupancy 64.8 (6)%.Due to the verstaile applications of 1,2-benzothiazine 1,1-dioxides, much attention has been given to their synthesis. Some derivatives act as potent calpain I inhibitors (Bihovsky et al., 2004) while others possess anti-bacterial, anti-fungal and anti-oxidant properties (Zia-ur-Rehman et al., 2006, 2009). In continuation of our work on the synthesis (Zia-ur-Rehman et al., 2006), biological activity (Zia-ur-Rehman et al., 2009) and crystal structures (Zia-ur-Rehman et al., 2007; Ahmad et al., 2008; Arshad et al., 2009) of various 1,2-benzothiazine-1,1-dioxides, we herein report the
of the title compound (I) (scheme and Fig. 1). Like the previously reported 1,2-benzothiazine1,1-dioxides (Zia-ur-Rehman et al., 2007; Ahmad et al., 2008; Arshad et al., 2009), the thiazine ring involving two double bonds, exhibits a distorted half-chair conformation; with atoms S1/C10/C5/C4 coplanar within ±0.022 Å and N2 and C3 lying 0.961 and 0.525 Å respectively out of this plane. The geometry at N2 is pyramidal. The C10—S1 [1.7484 (17) Å] bond is shorter than a normal C—S single bond (1.81–2.55 Å) (Weast et al., 1984) due to partial double bond character and this value is in agreement with similar, partially delocalized, bonds (Kojić-Prodić & Rużić-Toroš, 1982; Fabiola et al., 1998]. Thepositions the partially disordered oxirane group approximately perpendicular to the planar portion of the thiazine ring; dihedral angles between C4/C5/C10/S1 and the two diordered oxirane positions: 103 (major) and 108° (minor). There are two significant, intermolecular C—H···O interactions (Fig 2 & Table 1). Each molecule makes a total of four such interactions, two as donor and two as acceptor, resulting in a two-dimensional thick sheet structure, where the depth of the sheet is due to the elevation of the methoxy-oxirane group with respect to the thiazine ring system.
For the synthesis of related molecules, see: Zia-ur-Rehman et al. (2006, 2007, 2009). For the biological activity of 1,2-benzothiazine 1,1-dioxides, see: Bihovsky et al. (2004); Fabiola et al. (1998); Kojić-Prodić & Rużić-Toroš (1982). For similar molecules, see: Ahmad et al. (2008); Arshad et al. (2009). For reference bond-length data, see: Weast et al. (1984).
Data collection: APEX2 (Bruker, 2007); cell
SAINT (Bruker, 2007); data reduction: SAINT (Bruker, 2007); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and local programs.C14H15NO6S | F(000) = 680 |
Mr = 325.33 | Dx = 1.490 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 4610 reflections |
a = 7.2007 (3) Å | θ = 2.6–31.4° |
b = 12.8435 (6) Å | µ = 0.25 mm−1 |
c = 15.7820 (7) Å | T = 300 K |
β = 96.5250 (7)° | Block, colourless |
V = 1450.10 (11) Å3 | 0.44 × 0.37 × 0.24 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 4516 independent reflections |
Radiation source: fine-focus sealed tube | 3651 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.016 |
ω rotation with narrow frames scans | θmax = 31.7°, θmin = 2.1° |
Absorption correction: multi-scan (SADABS; Sheldrick, 2004) | h = −10→10 |
Tmin = 0.897, Tmax = 0.942 | k = −18→14 |
11439 measured reflections | l = −22→17 |
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)] = 0.051 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.155 | H-atom parameters constrained |
S = 1.08 | w = 1/[σ2(Fo2) + (0.0788P)2 + 0.4338P] where P = (Fo2 + 2Fc2)/3 |
4516 reflections | (Δ/σ)max = 0.001 |
220 parameters | Δρmax = 0.70 e Å−3 |
0 restraints | Δρmin = −0.27 e Å−3 |
C14H15NO6S | V = 1450.10 (11) Å3 |
Mr = 325.33 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 7.2007 (3) Å | µ = 0.25 mm−1 |
b = 12.8435 (6) Å | T = 300 K |
c = 15.7820 (7) Å | 0.44 × 0.37 × 0.24 mm |
β = 96.5250 (7)° |
Bruker APEXII CCD diffractometer | 4516 independent reflections |
Absorption correction: multi-scan (SADABS; Sheldrick, 2004) | 3651 reflections with I > 2σ(I) |
Tmin = 0.897, Tmax = 0.942 | Rint = 0.016 |
11439 measured reflections |
R[F2 > 2σ(F2)] = 0.051 | 0 restraints |
wR(F2) = 0.155 | H-atom parameters constrained |
S = 1.08 | Δρmax = 0.70 e Å−3 |
4516 reflections | Δρmin = −0.27 e Å−3 |
220 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 | Occ. (<1) | |
S1 | 0.34508 (6) | 0.47351 (3) | 0.61034 (2) | 0.04004 (14) | |
O1 | 0.53323 (19) | 0.44619 (11) | 0.64070 (9) | 0.0512 (3) | |
O2 | 0.2622 (2) | 0.43268 (12) | 0.53097 (8) | 0.0601 (4) | |
N2 | 0.2133 (2) | 0.44064 (11) | 0.68409 (9) | 0.0387 (3) | |
C3 | 0.2671 (2) | 0.48744 (13) | 0.76543 (10) | 0.0373 (3) | |
C4 | 0.3247 (2) | 0.58822 (13) | 0.76958 (10) | 0.0368 (3) | |
C5 | 0.3205 (2) | 0.65332 (13) | 0.69280 (10) | 0.0366 (3) | |
C6 | 0.3032 (3) | 0.76159 (14) | 0.69774 (14) | 0.0481 (4) | |
H6 | 0.3046 | 0.7937 | 0.7506 | 0.058* | |
C7 | 0.2842 (3) | 0.82078 (16) | 0.62423 (17) | 0.0594 (5) | |
H7 | 0.2724 | 0.8927 | 0.6283 | 0.071* | |
C8 | 0.2823 (3) | 0.77530 (17) | 0.54444 (16) | 0.0571 (5) | |
H8 | 0.2684 | 0.8163 | 0.4956 | 0.069* | |
C9 | 0.3014 (3) | 0.66804 (16) | 0.53801 (12) | 0.0465 (4) | |
H9 | 0.3006 | 0.6364 | 0.4850 | 0.056* | |
C10 | 0.3215 (2) | 0.60897 (13) | 0.61187 (10) | 0.0364 (3) | |
C11 | 0.0099 (3) | 0.43184 (18) | 0.65850 (14) | 0.0550 (5) | |
H11A | −0.0408 | 0.4996 | 0.6443 | 0.082* | |
H11B | −0.0493 | 0.4034 | 0.7048 | 0.082* | |
H11C | −0.0121 | 0.3869 | 0.6098 | 0.082* | |
C12 | 0.2533 (3) | 0.42003 (16) | 0.84103 (11) | 0.0456 (4) | |
O3 | 0.2713 (3) | 0.44879 (15) | 0.91356 (10) | 0.0813 (6) | |
O4 | 0.2175 (2) | 0.32170 (12) | 0.81730 (9) | 0.0546 (3) | |
C13 | 0.2062 (3) | 0.2467 (2) | 0.88466 (17) | 0.0661 (6) | |
H13A | 0.1027 | 0.2636 | 0.9154 | 0.099* | |
H13B | 0.3199 | 0.2482 | 0.9229 | 0.099* | |
H13C | 0.1885 | 0.1783 | 0.8605 | 0.099* | |
O5 | 0.37071 (18) | 0.63669 (11) | 0.84539 (8) | 0.0469 (3) | |
C14 | 0.5579 (4) | 0.6871 (3) | 0.8572 (2) | 0.0451 (8) | 0.646 (6) |
H14A | 0.5811 | 0.7217 | 0.8049 | 0.054* | 0.646 (6) |
H14B | 0.5605 | 0.7392 | 0.9018 | 0.054* | 0.646 (6) |
C15 | 0.7068 (5) | 0.6087 (3) | 0.8807 (2) | 0.0500 (8) | 0.646 (6) |
H15 | 0.6875 | 0.5604 | 0.9270 | 0.060* | 0.646 (6) |
C16 | 0.8933 (4) | 0.6281 (2) | 0.8656 (2) | 0.0836 (8) | |
H16A | 0.9917 | 0.5941 | 0.9028 | 0.100* | 0.646 (6) |
H16B | 0.9238 | 0.6977 | 0.8477 | 0.100* | 0.646 (6) |
H16C | 0.9273 | 0.5999 | 0.9223 | 0.100* | 0.354 (6) |
H16D | 0.9886 | 0.6711 | 0.8444 | 0.100* | 0.354 (6) |
O6 | 0.7826 (3) | 0.56506 (15) | 0.80605 (13) | 0.0782 (5) | |
C14X | 0.5510 (8) | 0.6227 (7) | 0.8916 (4) | 0.057 (2) | 0.354 (6) |
H14C | 0.5688 | 0.5497 | 0.9059 | 0.069* | 0.354 (6) |
H14D | 0.5578 | 0.6618 | 0.9444 | 0.069* | 0.354 (6) |
C15X | 0.7008 (8) | 0.6571 (6) | 0.8428 (5) | 0.0577 (19) | 0.354 (6) |
H15X | 0.6761 | 0.7179 | 0.8057 | 0.069* | 0.354 (6) |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0542 (3) | 0.0363 (2) | 0.0306 (2) | 0.00076 (16) | 0.00890 (16) | −0.00584 (14) |
O1 | 0.0530 (7) | 0.0515 (7) | 0.0514 (8) | 0.0115 (6) | 0.0160 (6) | −0.0025 (6) |
O2 | 0.0911 (11) | 0.0555 (8) | 0.0335 (6) | −0.0064 (7) | 0.0059 (7) | −0.0133 (6) |
N2 | 0.0468 (7) | 0.0380 (7) | 0.0313 (6) | −0.0071 (6) | 0.0045 (5) | −0.0030 (5) |
C3 | 0.0402 (8) | 0.0430 (8) | 0.0289 (7) | −0.0018 (6) | 0.0050 (6) | −0.0006 (6) |
C4 | 0.0378 (7) | 0.0428 (8) | 0.0304 (7) | −0.0006 (6) | 0.0065 (5) | −0.0093 (6) |
C5 | 0.0362 (7) | 0.0358 (7) | 0.0384 (8) | −0.0005 (6) | 0.0070 (6) | −0.0037 (6) |
C6 | 0.0459 (9) | 0.0390 (8) | 0.0603 (11) | 0.0014 (7) | 0.0103 (8) | −0.0083 (8) |
C7 | 0.0552 (11) | 0.0375 (9) | 0.0866 (16) | 0.0056 (8) | 0.0125 (10) | 0.0097 (10) |
C8 | 0.0519 (10) | 0.0546 (11) | 0.0655 (13) | 0.0047 (9) | 0.0095 (9) | 0.0221 (10) |
C9 | 0.0444 (9) | 0.0561 (10) | 0.0393 (8) | −0.0004 (8) | 0.0062 (7) | 0.0092 (8) |
C10 | 0.0398 (7) | 0.0362 (7) | 0.0336 (7) | −0.0002 (6) | 0.0064 (6) | −0.0001 (6) |
C11 | 0.0496 (10) | 0.0624 (12) | 0.0509 (11) | −0.0095 (9) | −0.0028 (8) | −0.0024 (9) |
C12 | 0.0443 (9) | 0.0565 (10) | 0.0362 (8) | −0.0017 (8) | 0.0059 (6) | 0.0082 (7) |
O3 | 0.1263 (17) | 0.0833 (12) | 0.0346 (7) | −0.0132 (11) | 0.0108 (9) | 0.0083 (7) |
O4 | 0.0625 (8) | 0.0499 (8) | 0.0511 (8) | −0.0061 (6) | 0.0045 (6) | 0.0157 (6) |
C13 | 0.0581 (12) | 0.0672 (14) | 0.0722 (15) | −0.0055 (10) | 0.0040 (10) | 0.0354 (12) |
O5 | 0.0506 (7) | 0.0567 (8) | 0.0339 (6) | −0.0054 (6) | 0.0068 (5) | −0.0157 (5) |
C14 | 0.0521 (16) | 0.0411 (16) | 0.0413 (15) | −0.0052 (11) | 0.0025 (11) | −0.0107 (13) |
C15 | 0.0631 (19) | 0.0476 (18) | 0.0383 (15) | 0.0020 (14) | 0.0021 (12) | −0.0019 (13) |
C16 | 0.0560 (13) | 0.0798 (17) | 0.112 (2) | 0.0020 (12) | −0.0028 (14) | −0.0217 (17) |
O6 | 0.0746 (11) | 0.0750 (11) | 0.0880 (13) | 0.0021 (9) | 0.0224 (10) | −0.0291 (10) |
C14X | 0.043 (3) | 0.092 (6) | 0.035 (3) | 0.005 (3) | −0.003 (2) | −0.016 (3) |
C15X | 0.049 (3) | 0.057 (4) | 0.067 (4) | −0.002 (3) | 0.007 (3) | −0.010 (3) |
S1—O2 | 1.4249 (14) | C12—O4 | 1.334 (3) |
S1—O1 | 1.4285 (15) | O4—C13 | 1.444 (2) |
S1—N2 | 1.6384 (14) | C13—H13A | 0.9600 |
S1—C10 | 1.7484 (17) | C13—H13B | 0.9600 |
N2—C3 | 1.430 (2) | C13—H13C | 0.9600 |
N2—C11 | 1.478 (2) | O5—C14X | 1.426 (6) |
C3—C4 | 1.358 (2) | O5—C14 | 1.488 (3) |
C3—C12 | 1.487 (2) | C14—C15 | 1.486 (5) |
C4—O5 | 1.3559 (18) | C14—H14A | 0.9700 |
C4—C5 | 1.470 (2) | C14—H14B | 0.9700 |
C5—C6 | 1.399 (2) | C15—C16 | 1.413 (5) |
C5—C10 | 1.399 (2) | C15—O6 | 1.465 (4) |
C6—C7 | 1.381 (3) | C15—H15 | 0.9800 |
C6—H6 | 0.9300 | C16—O6 | 1.416 (3) |
C7—C8 | 1.387 (3) | C16—C15X | 1.441 (7) |
C7—H7 | 0.9300 | C16—H16A | 0.9700 |
C8—C9 | 1.389 (3) | C16—H16B | 0.9700 |
C8—H8 | 0.9300 | C16—H16C | 0.9699 |
C9—C10 | 1.385 (2) | C16—H16D | 0.9701 |
C9—H9 | 0.9300 | O6—C15X | 1.469 (7) |
C11—H11A | 0.9600 | C14X—C15X | 1.462 (11) |
C11—H11B | 0.9600 | C14X—H14C | 0.9700 |
C11—H11C | 0.9600 | C14X—H14D | 0.9700 |
C12—O3 | 1.196 (2) | C15X—H15X | 0.9800 |
O2—S1—O1 | 119.39 (9) | H13B—C13—H13C | 109.5 |
O2—S1—N2 | 108.14 (9) | C4—O5—C14X | 120.7 (3) |
O1—S1—N2 | 107.59 (8) | C4—O5—C14 | 115.97 (16) |
O2—S1—C10 | 110.29 (9) | C15—C14—O5 | 110.7 (3) |
O1—S1—C10 | 109.25 (8) | C15—C14—H14A | 109.5 |
N2—S1—C10 | 100.47 (7) | O5—C14—H14A | 109.5 |
C3—N2—C11 | 115.86 (14) | C15—C14—H14B | 109.5 |
C3—N2—S1 | 114.17 (11) | O5—C14—H14B | 109.5 |
C11—N2—S1 | 117.46 (12) | H14A—C14—H14B | 108.1 |
C4—C3—N2 | 119.59 (14) | C16—C15—O6 | 58.9 (2) |
C4—C3—C12 | 124.33 (15) | C16—C15—C14 | 120.8 (4) |
N2—C3—C12 | 116.07 (15) | O6—C15—C14 | 112.5 (3) |
O5—C4—C3 | 121.52 (15) | C16—C15—H15 | 117.0 |
O5—C4—C5 | 116.50 (15) | O6—C15—H15 | 117.0 |
C3—C4—C5 | 121.65 (14) | C14—C15—H15 | 117.0 |
C6—C5—C10 | 117.72 (16) | C15—C16—O6 | 62.37 (18) |
C6—C5—C4 | 120.88 (15) | O6—C16—C15X | 61.9 (3) |
C10—C5—C4 | 121.28 (14) | C15—C16—H16A | 117.5 |
C7—C6—C5 | 120.10 (19) | O6—C16—H16A | 117.5 |
C7—C6—H6 | 120.0 | C15X—C16—H16A | 152.0 |
C5—C6—H6 | 120.0 | C15—C16—H16B | 117.5 |
C6—C7—C8 | 121.39 (19) | O6—C16—H16B | 117.5 |
C6—C7—H7 | 119.3 | C15X—C16—H16B | 86.1 |
C8—C7—H7 | 119.3 | H16A—C16—H16B | 114.6 |
C7—C8—C9 | 119.55 (19) | C15—C16—H16C | 85.6 |
C7—C8—H8 | 120.2 | O6—C16—H16C | 117.6 |
C9—C8—H8 | 120.2 | C15X—C16—H16C | 117.5 |
C10—C9—C8 | 118.92 (18) | H16B—C16—H16C | 124.8 |
C10—C9—H9 | 120.5 | C15—C16—H16D | 151.9 |
C8—C9—H9 | 120.5 | O6—C16—H16D | 117.6 |
C9—C10—C5 | 122.31 (16) | C15X—C16—H16D | 117.7 |
C9—C10—S1 | 122.33 (13) | H16A—C16—H16D | 88.2 |
C5—C10—S1 | 115.35 (12) | H16C—C16—H16D | 114.7 |
N2—C11—H11A | 109.5 | C16—O6—C15 | 58.70 (19) |
N2—C11—H11B | 109.5 | C16—O6—C15X | 59.9 (3) |
H11A—C11—H11B | 109.5 | O5—C14X—C15X | 112.1 (6) |
N2—C11—H11C | 109.5 | O5—C14X—H14C | 109.2 |
H11A—C11—H11C | 109.5 | C15X—C14X—H14C | 109.2 |
H11B—C11—H11C | 109.5 | O5—C14X—H14D | 109.2 |
O3—C12—O4 | 123.89 (18) | C15X—C14X—H14D | 109.2 |
O3—C12—C3 | 125.4 (2) | H14C—C14X—H14D | 107.9 |
O4—C12—C3 | 110.75 (15) | C16—C15X—C14X | 122.4 (8) |
C12—O4—C13 | 116.76 (18) | C16—C15X—O6 | 58.2 (3) |
O4—C13—H13A | 109.5 | C14X—C15X—O6 | 108.5 (7) |
O4—C13—H13B | 109.5 | C16—C15X—H15X | 117.4 |
H13A—C13—H13B | 109.5 | C14X—C15X—H15X | 117.4 |
O4—C13—H13C | 109.5 | O6—C15X—H15X | 117.4 |
H13A—C13—H13C | 109.5 | ||
O2—S1—N2—C3 | −172.61 (13) | N2—S1—C10—C5 | 39.59 (14) |
O1—S1—N2—C3 | 57.18 (14) | C4—C3—C12—O3 | 8.5 (3) |
C10—S1—N2—C3 | −57.04 (13) | N2—C3—C12—O3 | −170.9 (2) |
O2—S1—N2—C11 | −32.06 (16) | C4—C3—C12—O4 | −171.60 (16) |
O1—S1—N2—C11 | −162.27 (14) | N2—C3—C12—O4 | 9.0 (2) |
C10—S1—N2—C11 | 83.50 (14) | O3—C12—O4—C13 | −2.0 (3) |
C11—N2—C3—C4 | −101.63 (19) | C3—C12—O4—C13 | 178.12 (16) |
S1—N2—C3—C4 | 39.6 (2) | C3—C4—O5—C14X | 81.6 (5) |
C11—N2—C3—C12 | 77.8 (2) | C5—C4—O5—C14X | −104.9 (5) |
S1—N2—C3—C12 | −141.04 (13) | C3—C4—O5—C14 | 126.8 (2) |
N2—C3—C4—O5 | 177.68 (14) | C5—C4—O5—C14 | −59.7 (2) |
C12—C3—C4—O5 | −1.7 (3) | C4—O5—C14—C15 | −79.8 (3) |
N2—C3—C4—C5 | 4.5 (2) | C14X—O5—C14—C15 | 27.8 (4) |
C12—C3—C4—C5 | −174.86 (15) | O5—C14—C15—C16 | 157.0 (3) |
O5—C4—C5—C6 | −20.4 (2) | O5—C14—C15—O6 | 90.8 (3) |
C3—C4—C5—C6 | 153.18 (17) | C14—C15—C16—O6 | −99.3 (3) |
O5—C4—C5—C10 | 163.78 (14) | O6—C15—C16—C15X | 79.6 (5) |
C3—C4—C5—C10 | −22.7 (2) | C14—C15—C16—C15X | −19.7 (5) |
C10—C5—C6—C7 | 1.3 (3) | C15X—C16—O6—C15 | −39.9 (4) |
C4—C5—C6—C7 | −174.71 (17) | C15—C16—O6—C15X | 39.9 (4) |
C5—C6—C7—C8 | −0.2 (3) | C14—C15—O6—C16 | 113.4 (4) |
C6—C7—C8—C9 | −0.5 (3) | C16—C15—O6—C15X | −81.5 (5) |
C7—C8—C9—C10 | 0.1 (3) | C14—C15—O6—C15X | 31.9 (5) |
C8—C9—C10—C5 | 1.0 (3) | C4—O5—C14X—C15X | 60.1 (8) |
C8—C9—C10—S1 | 179.64 (14) | C14—O5—C14X—C15X | −34.6 (5) |
C6—C5—C10—C9 | −1.7 (2) | C15—C16—C15X—C14X | 11.7 (5) |
C4—C5—C10—C9 | 174.28 (15) | O6—C16—C15X—C14X | 92.8 (6) |
C6—C5—C10—S1 | 179.57 (13) | C15—C16—C15X—O6 | −81.2 (5) |
C4—C5—C10—S1 | −4.4 (2) | O5—C14X—C15X—C16 | −164.2 (5) |
O2—S1—C10—C9 | −25.20 (17) | O5—C14X—C15X—O6 | −100.7 (7) |
O1—S1—C10—C9 | 107.90 (15) | C15—O6—C15X—C16 | 77.6 (5) |
N2—S1—C10—C9 | −139.14 (15) | C16—O6—C15X—C14X | −117.2 (7) |
O2—S1—C10—C5 | 153.53 (13) | C15—O6—C15X—C14X | −39.7 (5) |
O1—S1—C10—C5 | −73.37 (14) |
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O6i | 0.93 | 2.49 | 3.377 (3) | 158 |
C15—H15···O3ii | 0.98 | 2.50 | 3.317 (4) | 140 |
Symmetry codes: (i) −x+1, y+1/2, −z+3/2; (ii) −x+1, −y+1, −z+2. |
Experimental details
Crystal data | |
Chemical formula | C14H15NO6S |
Mr | 325.33 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 300 |
a, b, c (Å) | 7.2007 (3), 12.8435 (6), 15.7820 (7) |
β (°) | 96.5250 (7) |
V (Å3) | 1450.10 (11) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.25 |
Crystal size (mm) | 0.44 × 0.37 × 0.24 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Sheldrick, 2004) |
Tmin, Tmax | 0.897, 0.942 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 11439, 4516, 3651 |
Rint | 0.016 |
(sin θ/λ)max (Å−1) | 0.739 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.051, 0.155, 1.08 |
No. of reflections | 4516 |
No. of parameters | 220 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.70, −0.27 |
Computer programs: APEX2 (Bruker, 2007), SAINT (Bruker, 2007), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), SHELXTL (Sheldrick, 2008) and local programs.
D—H···A | D—H | H···A | D···A | D—H···A |
C7—H7···O6i | 0.93 | 2.49 | 3.377 (3) | 158 |
C15—H15···O3ii | 0.98 | 2.50 | 3.317 (4) | 140.2 |
Symmetry codes: (i) −x+1, y+1/2, −z+3/2; (ii) −x+1, −y+1, −z+2. |
Acknowledgements
The authors are grateful to Loughborough University for the analysis of the title compound.
References
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Due to the verstaile applications of 1,2-benzothiazine 1,1-dioxides, much attention has been given to their synthesis. Some derivatives act as potent calpain I inhibitors (Bihovsky et al., 2004) while others possess anti-bacterial, anti-fungal and anti-oxidant properties (Zia-ur-Rehman et al., 2006, 2009). In continuation of our work on the synthesis (Zia-ur-Rehman et al., 2006), biological activity (Zia-ur-Rehman et al., 2009) and crystal structures (Zia-ur-Rehman et al., 2007; Ahmad et al., 2008; Arshad et al., 2009) of various 1,2-benzothiazine-1,1-dioxides, we herein report the crystal structure of the title compound (I) (scheme and Fig. 1). Like the previously reported 1,2-benzothiazine1,1-dioxides (Zia-ur-Rehman et al., 2007; Ahmad et al., 2008; Arshad et al., 2009), the thiazine ring involving two double bonds, exhibits a distorted half-chair conformation; with atoms S1/C10/C5/C4 coplanar within ±0.022 Å and N2 and C3 lying 0.961 and 0.525 Å respectively out of this plane. The geometry at N2 is pyramidal. The C10—S1 [1.7484 (17) Å] bond is shorter than a normal C—S single bond (1.81–2.55 Å) (Weast et al., 1984) due to partial double bond character and this value is in agreement with similar, partially delocalized, bonds (Kojić-Prodić & Rużić-Toroš, 1982; Fabiola et al., 1998]. The
positions the partially disordered oxirane group approximately perpendicular to the planar portion of the thiazine ring; dihedral angles between C4/C5/C10/S1 and the two diordered oxirane positions: 103 (major) and 108° (minor). There are two significant, intermolecular C—H···O interactions (Fig 2 & Table 1). Each molecule makes a total of four such interactions, two as donor and two as acceptor, resulting in a two-dimensional thick sheet structure, where the depth of the sheet is due to the elevation of the methoxy-oxirane group with respect to the thiazine ring system.