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Acta Cryst. (2010). E66, o618    [ doi:10.1107/S160053681000543X ]

2-[2-(3-Methoxyphenyl)-2-oxoethyl]-1,2-benzisothiazol-3(2H)-one 1,1-dioxide

S. Gul, H. L. Siddiqui, M. Ahmad, M. Azam and M. Parvez

Abstract top

In the title compound, C16H13NO5S, the benzothiazole unit is essentially planar [maximum deviation = 0.0501 (10) Å for the S atom] and is oriented at a dihedral angle of 67.85 (5)° with respect to the methoxy-substituted benzene ring. The mean plane of the methoxy group is oriented at 14.3 (3)° with respect to the benzene ring to which it is attached. In the crystal structure, weak C-H...O hydrogen bonds form macrocyclic rings with R22(10) and R22(12) motifs.

Comment top

1,2-Benzisothiazoline-3-one 1,1-dioxide (saccharine) is an important starting material for the synthesis of different heterocyclic compounds and plays a role as an intermediate for the preparation of medicinally important molecules (Siddiqui et al., 2006; Zia-ur-Rehman et al., 2009). Various derivatives of saccharin are known to be cyclooxygenase-2 (COX-2) inhibitors (Singh et al., 2007), analgesic (Vaccarino et al., 2007), human leucocyte elastase (HLE) inhibitors (Kapui et al., 2003) etc. In continuation of our research on the synthesis of potential biologically active derivatives of benzothiazines (Ahmad et al., 2008; Ahmad et al., 2009), we herein report the crystal structure of the title compound, N-(3-methoxyphenacyl)saccharin, (I).

The structure of (I) contains discrete molecules separated by normal van der Waals distances (Fig. 1). The benzothiazole moiety (S1/N1/C1–C7) is essentially planar (maximum deviation = 0.0501 (10) Å for atom S1) and lies at an angle 67.85 (5)° with respect to the benzene ring ). The methoxy group is oriented at 14.3 (3)° with respect to the benzene ring (C10–C15). The structure is devoid of any classical hydrogen bonds. However, non-classical hydrogen bonding interactions of the type C—H···O are present in the crystal structure resulting in ten and twelve membered macrocyclic rings in R22(10) and R22(12) motifs (Bernstein et al., 1995) (Fig. 2 and Table 1).

Related literature top

For the use of 1,2-benzisothiazoline-3-one 1,1-dioxide (saccharine) as an intermediate in the preparation of medicinally important molecules, see: Siddiqui et al. (2006); Zia-ur-Rehman et al. (2005, 2009). For the biological activity of saccharine, see: Singh et al. (2007); Vaccarino et al. (2007); Kapui et al. (2003). For related structures, see: Ahmad et al. (2008, 2009). For hydrogen-bonding motifs, see: Bernstein et al. (1995).

Experimental top

3-Methoxy phenacyl bromide (5.49 g, 0.024 mol) was slowly added to a suspension of sodium saccharine (5 g, 0.024 mol) in dimethylformamide (15 ml) and the mixture was stirred at 383 K for 3.0 hours under anhydrous conditions. On completion of reaction (indicated by tlc), the mixture was poured on crushed ice and the precipitates formed were filtered and washed with an excess of distilled water and cold ethanol respectively. Crystals suitable for diffraction were grown from a solution of (I) in chloroform–methanol (3:1).

Refinement top

All H atoms were located from the difference Fourier maps and were included in the refinements at geometrically idealized positions with C—H distances = 0.95, 0.98 and 0.99 Å for aryl, methyl and methylene H atoms, respectively, and Uiso = 1.2 times Ueq of the C atoms to which they were bonded. The final difference map was free of chemically significant features.

Computing details top

Data collection: COLLECT (Nonius, 1998); cell refinement: HKL 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).

Figures top
[Figure 1] Fig. 1. ORTEP-3 (Farrugia, 1997) drawing of (I) with displacement ellipsoids plotted at 50% probability level.
[Figure 2] Fig. 2. Unit cell packing of (I) showing non-classical hydrogen bonding interactions with dashed lines; H atoms not involved in H-bonds have been excluded for clarity.
2-[2-(3-Methoxyphenyl)-2-oxoethyl]-1,2-benzisothiazol-3(2H)-one 1,1-dioxide top
Crystal data top
C16H13NO5SF(000) = 688
Mr = 331.33Dx = 1.474 Mg m−3
Monoclinic, P21/nMelting point: 446 K
Hall symbol: -P 2ynMo Kα radiation, λ = 0.71073 Å
a = 8.9824 (3) ÅCell parameters from 3447 reflections
b = 8.5801 (4) Åθ = 1.0–27.5°
c = 19.5645 (7) ŵ = 0.24 mm−1
β = 97.942 (2)°T = 173 K
V = 1493.37 (10) Å3Prism, white
Z = 40.14 × 0.12 × 0.10 mm
Data collection top
Nonius APEX2 CCD
diffractometer		3399 independent reflections
Radiation source: fine-focus sealed tube2897 reflections with I > 2σ(I)
graphiteRint = 0.027
φ and ω scansθmax = 27.5°, θmin = 2.6°
Absorption correction: multi-scan
(SORTAV; Blessing, 1997)		h = −11→11
Tmin = 0.967, Tmax = 0.976k = −11→11
15084 measured reflectionsl = −25→25
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.046Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.136H-atom parameters constrained
S = 1.06 w = 1/[σ2(Fo2) + (0.0682P)2 + 1.0411P]
where P = (Fo2 + 2Fc2)/3
3399 reflections(Δ/σ)max = 0.001
209 parametersΔρmax = 0.34 e Å−3
0 restraintsΔρmin = −0.37 e Å−3
Crystal data top
C16H13NO5SV = 1493.37 (10) Å3
Mr = 331.33Z = 4
Monoclinic, P21/nMo Kα radiation
a = 8.9824 (3) ŵ = 0.24 mm−1
b = 8.5801 (4) ÅT = 173 K
c = 19.5645 (7) Å0.14 × 0.12 × 0.10 mm
β = 97.942 (2)°
Data collection top
Nonius APEX2 CCD
diffractometer		3399 independent reflections
Absorption correction: multi-scan
(SORTAV; Blessing, 1997)		2897 reflections with I > 2σ(I)
Tmin = 0.967, Tmax = 0.976Rint = 0.027
15084 measured reflectionsθmax = 27.5°
Refinement top
R[F2 > 2σ(F2)] = 0.046H-atom parameters constrained
wR(F2) = 0.136Δρmax = 0.34 e Å−3
S = 1.06Δρmin = −0.37 e Å−3
3399 reflectionsAbsolute structure: ?
209 parametersFlack parameter: ?
0 restraintsRogers parameter: ?
Special details top

Geometry. All esds (except the esd in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell esds are taken into account individually in the estimation of esds in distances, angles and torsion angles; correlations between esds in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell esds is used for estimating esds involving l.s. planes.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
S10.22107 (5)0.29868 (6)0.10828 (2)0.02685 (16)
O10.03462 (17)−0.00650 (19)0.20389 (8)0.0382 (4)
O20.21767 (18)0.45904 (18)0.12764 (8)0.0368 (4)
O30.35116 (16)0.2458 (2)0.08049 (8)0.0391 (4)
O40.36297 (18)−0.07414 (19)0.17637 (8)0.0417 (4)
O50.79500 (17)0.2056 (2)0.39967 (9)0.0431 (4)
N10.19250 (18)0.1858 (2)0.17480 (9)0.0284 (4)
C10.0523 (2)0.2394 (2)0.05901 (10)0.0270 (4)
C2−0.0056 (3)0.2914 (3)−0.00668 (11)0.0332 (5)
H20.04270.3702−0.02970.040*
C3−0.1387 (3)0.2208 (3)−0.03674 (12)0.0389 (5)
H3−0.18320.2531−0.08140.047*
C4−0.2074 (2)0.1051 (3)−0.00311 (12)0.0398 (5)
H4−0.29660.0577−0.02560.048*
C5−0.1486 (2)0.0565 (3)0.06313 (12)0.0355 (5)
H5−0.1971−0.02170.08650.043*
C6−0.0165 (2)0.1264 (2)0.09381 (10)0.0283 (4)
C70.0673 (2)0.0893 (2)0.16294 (10)0.0285 (4)
C80.3125 (2)0.1633 (2)0.23198 (10)0.0283 (4)
H8A0.26840.15270.27540.034*
H8B0.37870.25610.23630.034*
C90.4060 (2)0.0187 (2)0.22173 (10)0.0288 (4)
C100.5481 (2)−0.0057 (2)0.27013 (10)0.0264 (4)
C110.6073 (2)0.1091 (2)0.31602 (10)0.0282 (4)
H110.55530.20480.31870.034*
C120.7438 (2)0.0836 (3)0.35828 (10)0.0313 (4)
C130.8174 (2)−0.0582 (3)0.35630 (11)0.0403 (6)
H130.9093−0.07650.38560.048*
C140.7554 (3)−0.1730 (3)0.31103 (12)0.0422 (6)
H140.8052−0.27050.31010.051*
C150.6230 (3)−0.1486 (3)0.26732 (11)0.0353 (5)
H150.5833−0.22730.23590.042*
C160.9474 (3)0.2006 (4)0.43204 (13)0.0506 (7)
H16A0.97280.29900.45630.061*
H16B1.01390.18490.39690.061*
H16C0.96010.11430.46520.061*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
S10.0282 (3)0.0253 (3)0.0253 (2)−0.00364 (18)−0.00269 (18)0.00023 (18)
O10.0353 (8)0.0327 (8)0.0443 (8)−0.0046 (6)−0.0030 (7)0.0125 (7)
O20.0499 (9)0.0246 (8)0.0336 (7)−0.0070 (7)−0.0030 (7)−0.0014 (6)
O30.0301 (7)0.0489 (10)0.0378 (8)−0.0030 (7)0.0034 (6)−0.0015 (7)
O40.0422 (9)0.0365 (9)0.0421 (9)0.0039 (7)−0.0096 (7)−0.0122 (7)
O50.0274 (8)0.0521 (11)0.0451 (9)0.0011 (7)−0.0117 (7)−0.0092 (8)
N10.0269 (8)0.0274 (9)0.0282 (8)−0.0031 (7)−0.0056 (7)0.0039 (7)
C10.0284 (9)0.0232 (9)0.0270 (9)0.0035 (8)−0.0046 (7)−0.0029 (7)
C20.0395 (11)0.0298 (11)0.0278 (10)0.0037 (9)−0.0045 (8)−0.0011 (8)
C30.0428 (12)0.0342 (12)0.0340 (11)0.0091 (10)−0.0145 (9)−0.0054 (9)
C40.0314 (10)0.0313 (12)0.0505 (13)0.0060 (9)−0.0164 (9)−0.0091 (10)
C50.0273 (10)0.0269 (11)0.0483 (12)0.0001 (8)−0.0080 (9)−0.0007 (9)
C60.0266 (9)0.0214 (10)0.0343 (10)0.0016 (7)−0.0055 (8)0.0007 (8)
C70.0259 (9)0.0228 (9)0.0346 (10)0.0002 (7)−0.0031 (8)0.0020 (8)
C80.0276 (9)0.0289 (10)0.0253 (9)0.0032 (8)−0.0068 (7)−0.0002 (8)
C90.0296 (10)0.0276 (10)0.0278 (9)−0.0004 (8)−0.0009 (8)−0.0008 (8)
C100.0266 (9)0.0270 (10)0.0254 (9)0.0008 (7)0.0031 (7)0.0019 (7)
C110.0238 (9)0.0302 (11)0.0299 (9)0.0026 (8)0.0007 (7)0.0010 (8)
C120.0236 (9)0.0417 (12)0.0280 (9)0.0020 (8)0.0011 (8)0.0021 (9)
C130.0283 (10)0.0580 (15)0.0335 (11)0.0155 (10)0.0005 (9)0.0051 (10)
C140.0399 (12)0.0450 (14)0.0416 (12)0.0209 (11)0.0051 (10)0.0012 (10)
C150.0396 (11)0.0324 (11)0.0341 (10)0.0086 (9)0.0053 (9)−0.0009 (9)
C160.0268 (11)0.080 (2)0.0413 (12)−0.0054 (11)−0.0093 (9)0.0013 (13)
Geometric parameters (Å, °) top
S1—O21.4286 (16)C5—H50.9500
S1—O31.4291 (16)C6—C71.489 (3)
S1—N11.6701 (17)C8—C91.527 (3)
S1—C11.7555 (19)C8—H8A0.9900
O1—C71.212 (2)C8—H8B0.9900
O4—C91.215 (2)C9—C101.496 (3)
O5—C121.364 (3)C10—C111.389 (3)
O5—C161.427 (3)C10—C151.403 (3)
N1—C71.390 (3)C11—C121.398 (3)
N1—C81.455 (2)C11—H110.9500
C1—C61.379 (3)C12—C131.388 (3)
C1—C21.391 (3)C13—C141.388 (4)
C2—C31.396 (3)C13—H130.9500
C2—H20.9500C14—C151.382 (3)
C3—C41.383 (4)C14—H140.9500
C3—H30.9500C15—H150.9500
C4—C51.394 (3)C16—H16A0.9800
C4—H40.9500C16—H16B0.9800
C5—C61.390 (3)C16—H16C0.9800
O2—S1—O3117.07 (10)N1—C8—H8A109.3
O2—S1—N1109.91 (9)C9—C8—H8A109.3
O3—S1—N1109.52 (9)N1—C8—H8B109.3
O2—S1—C1112.10 (9)C9—C8—H8B109.3
O3—S1—C1112.87 (9)H8A—C8—H8B107.9
N1—S1—C192.63 (9)O4—C9—C10121.86 (19)
C12—O5—C16117.68 (19)O4—C9—C8120.25 (17)
C7—N1—C8123.05 (17)C10—C9—C8117.87 (16)
C7—N1—S1115.04 (13)C11—C10—C15120.17 (19)
C8—N1—S1119.92 (14)C11—C10—C9121.80 (18)
C6—C1—C2123.07 (19)C15—C10—C9118.02 (18)
C6—C1—S1110.15 (14)C10—C11—C12119.80 (19)
C2—C1—S1126.75 (17)C10—C11—H11120.1
C1—C2—C3116.1 (2)C12—C11—H11120.1
C1—C2—H2122.0O5—C12—C13124.50 (19)
C3—C2—H2122.0O5—C12—C11115.27 (19)
C4—C3—C2121.6 (2)C13—C12—C11120.2 (2)
C4—C3—H3119.2C12—C13—C14119.2 (2)
C2—C3—H3119.2C12—C13—H13120.4
C3—C4—C5121.4 (2)C14—C13—H13120.4
C3—C4—H4119.3C15—C14—C13121.5 (2)
C5—C4—H4119.3C15—C14—H14119.2
C6—C5—C4117.6 (2)C13—C14—H14119.2
C6—C5—H5121.2C14—C15—C10119.0 (2)
C4—C5—H5121.2C14—C15—H15120.5
C1—C6—C5120.31 (19)C10—C15—H15120.5
C1—C6—C7113.22 (17)O5—C16—H16A109.5
C5—C6—C7126.45 (19)O5—C16—H16B109.5
O1—C7—N1123.93 (18)H16A—C16—H16B109.5
O1—C7—C6127.41 (18)O5—C16—H16C109.5
N1—C7—C6108.65 (17)H16A—C16—H16C109.5
N1—C8—C9111.66 (16)H16B—C16—H16C109.5
O2—S1—N1—C7120.14 (16)S1—N1—C7—C6−5.4 (2)
O3—S1—N1—C7−109.92 (16)C1—C6—C7—O1−178.6 (2)
C1—S1—N1—C75.48 (16)C5—C6—C7—O1−0.4 (4)
O2—S1—N1—C8−75.42 (17)C1—C6—C7—N12.3 (2)
O3—S1—N1—C854.52 (17)C5—C6—C7—N1−179.5 (2)
C1—S1—N1—C8169.92 (16)C7—N1—C8—C970.4 (2)
O2—S1—C1—C6−116.57 (15)S1—N1—C8—C9−92.72 (19)
O3—S1—C1—C6108.65 (16)N1—C8—C9—O4−11.3 (3)
N1—S1—C1—C6−3.83 (16)N1—C8—C9—C10170.25 (17)
O2—S1—C1—C265.5 (2)O4—C9—C10—C11171.5 (2)
O3—S1—C1—C2−69.3 (2)C8—C9—C10—C11−10.0 (3)
N1—S1—C1—C2178.3 (2)O4—C9—C10—C15−7.4 (3)
C6—C1—C2—C3−0.7 (3)C8—C9—C10—C15171.06 (19)
S1—C1—C2—C3176.93 (17)C15—C10—C11—C121.6 (3)
C1—C2—C3—C4−0.6 (3)C9—C10—C11—C12−177.32 (18)
C2—C3—C4—C51.6 (4)C16—O5—C12—C1313.8 (3)
C3—C4—C5—C6−1.2 (3)C16—O5—C12—C11−166.2 (2)
C2—C1—C6—C51.1 (3)C10—C11—C12—O5177.70 (18)
S1—C1—C6—C5−176.85 (17)C10—C11—C12—C13−2.3 (3)
C2—C1—C6—C7179.45 (19)O5—C12—C13—C14−178.9 (2)
S1—C1—C6—C71.4 (2)C11—C12—C13—C141.2 (3)
C4—C5—C6—C1−0.2 (3)C12—C13—C14—C150.8 (4)
C4—C5—C6—C7−178.2 (2)C13—C14—C15—C10−1.5 (4)
C8—N1—C7—O111.6 (3)C11—C10—C15—C140.3 (3)
S1—N1—C7—O1175.52 (17)C9—C10—C15—C14179.3 (2)
C8—N1—C7—C6−169.29 (17)
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
C5—H5···O5i0.952.533.404 (3)153
C8—H8B···O1ii0.992.423.318 (3)150
C8—H8A···O2i0.992.513.301 (3)137
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) −x+1/2, y+1/2, −z+1/2.
Table 1
Hydrogen-bond geometry (Å, °) top
D—H···AD—HH···AD···AD—H···A
C5—H5···O5i0.952.533.404 (3)153
C8—H8B···O1ii0.992.423.318 (3)150
C8—H8A···O2i0.992.513.301 (3)137
Symmetry codes: (i) −x+1/2, y−1/2, −z+1/2; (ii) −x+1/2, y+1/2, −z+1/2.
Acknowledgements top

The authors thank the Higher Education Commission of Pakistan for financial support of this research.

references
References top

Ahmad, M., Siddiqui, H. L., Azam, M., Siddiqui, W. A. & Parvez, M. (2009). Acta Cryst. E65, o2185.

Ahmad, M., Siddiqui, H. L., Zia-ur-Rehman, M., Ashiq, M. I. & Tizzard, G. J. (2008). Acta Cryst. E64, o788.

Bernstein, J., Davis, R. E., Shimoni, L. & Chang, N.-L. (1995). Angew. Chem. Int. Ed. Engl. 34, 1555–1573.

Blessing, R. H. (1997). J. Appl. Cryst. 30, 421–426.

Farrugia, L. J. (1997). J. Appl. Cryst. 30, 565.

Kapui, Z., Varga, M., Urban-Szabo, K., Mikus, E., Szabo, T., Szeredi, J., Batori, S., Finance, O. & Aranyi, P. (2003). J. Pharmacol. Exp. Ther. 305, 451–459.

Nonius (1998). COLLECT. Nonius BV, Delft, The Netherlands.

Otwinowski, Z. & Minor, W. (1997). Methods in Enzymology, Vol. 276, Macromolecular Crystallography, Part A, edited by C. W. Carter Jr & R. M. Sweet, pp. 307–326. New York: Academic Press.

Sheldrick, G. M. (2008). Acta Cryst. A64, 112–122.

Siddiqui, W. A., Ahmad, S., Ullah, I. & Malik, A. (2006). J. Chem. Soc. Pak. 28, 583–589.

Singh, S. K., Shivaramakrishna, S., Saibaba, V., Rao, K. S., Ganesh, K. R., Vasudev, R., Kumar, P. P., Babu, J. M., Vyas, K., Rao, Y. K. & Iqbal, J. (2007). Eur. J. Med. Chem. 42, 456–462.

Vaccarino, A. L., Paul, D., Mukherjee, P. K., de Turco, E. B. R., Marcheselli, V. L., Xu, L., Trudell, M. L., Minguez, J. M., Matia, M. P., Sunkel, C., Alvarez-Builla, J. & Bazan, N. G. (2007). Bioorg. Med. Chem. 15, 2206–2215.

Zia-ur-Rehman, M. Z., Choudary, J. A. & Ahmad, S. (2005). Bull. Korean Chem. Soc. 26, 1771–1175.

Zia-ur-Rehman, M., Choudary, J. A., Elsegood, M. R. J., Siddiqui, H. L. & Khan, K. M. (2009). Eur. J. Med. Chem. 44, 1311–1316.