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ISSN: 2056-9890

Crystal structure of (R)-6′-bromo-3,3-di­methyl-3′,4′-di­hydro-2′H-spiro­[cyclo­hexane-1,3′-1,2,4-benzo­thia­diazine] 1′,1′-dioxide

aDepartment of Studies and Research in Chemistry, Tumkur University, Tumkur 572 103, India, bDepartment of Studies and Research in Chemistry, U.C.S., Tumkur University, Tumkur 572 013, India, cInstitution of Excellence, Vijnana Bhavan, University of Mysore, Manasagangotri, India, and dDepartment of Studies in Physics, University of Mysore, Manasagangotri, Mysore, India
*Correspondence e-mail: nirmaldb@rediffmail.com

Edited by H. Stoeckli-Evans, University of Neuchâtel, Switzerland (Received 10 October 2014; accepted 12 October 2014; online 18 October 2014)

In the title compound, C14H19BrN2O2S, the 1,2,4-thia­diazinane ring adopts an envelope conformation with the N atom (attached to the sulfonyl group) as the flap, while the cyclo­hexane ring adopts a chair conformation. The mean plane of the cyclo­hexane ring is almost normal to the benzene ring and the mean plane of the 1,2,4-thia­diazinane ring, making dihedral angles of 70.4 (2) and 71.43 (19)°, respectively. Furthermore, the dihedral angle between the benzene ring and the mean plane of the 1,2,4-thia­diazinane ring is 4.91 (18)°. The mol­ecular structure is stabilized by an intra­molecular C—H⋯O hydrogen bond, which encloses an S(6) ring motif. In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds into chains along [10-1], forming a C(6) graph-set motif. These chains are inter­connected via C—H⋯π inter­actions, leading to chains along [-101], so finally forming sheets parallel to (010).

1. Chemical context

The sulfonamide class of drugs have been widely reported for their anti­bacterial and anti­fungal activities (Trujillo et al., 2009[Trujillo, J. I., Kiefer, J. R., Huang, W., Thorarensen, A., Xing, L., Caspers, N. L., Day, J. E., Mathis, K. J., Kretzmer, K. K., Reitz, B. A., Weinberg, R. A., Stegeman, R. A., Wrightstone, A., Christine, L., Compton, R. & Li, X. (2009). Bioorg. Med. Chem. Lett. 19, 908-911.]). 1,2,4-Benzo­thia­diazine 1,1-dioxides are used as anti­hypertensive, diuretic, anti­diabetic, glutamine­rgic neuro modulators (Cordi et al., 1996[Cordi, A., Spedding, M., Serkiz, B., Lepagnol, J., Desos, P. & Morain, P. (1996). Chem. Abstr. 124, 261085.]) and K-channel inhibitors (Di Bella et al., 1983[Di Bella, M., Monzani, A., Andrisano, M. G., Fabio, U. & Quaglio, G. P. (1983). Farmaco, 38, 466-472.]). Furthermore, benzo­thia­diazine-3-one 1,1-dioxide and its derivatives have been reported for their potential hypoglycemic (Scozzafava et al., 2003[Scozzafava, A., Owa, T., Mastrolorenzo, A. & Supuran, C. T. (2003). Curr. Med. Chem. 10, 925-953.]), anti­cancer and anti-HIV activities (Casini et al., 2002[Casini, A., Scozzafava, A., Mastrolorenzo, A. & Supuran, C. (2002). Curr. Cancer Drug Targets, 2, 55-75.]), and they have also been reported to serve as selective antagonists of CXR2 (Hayao et al., 1968[Hayao, S., Strycker, W. G., Phillips, B. & Fujimori, H. (1968). J. Med. Chem. 11, 1246-1248.]). In addition, 2-substituted-2H-1,2,4-benzo­thia­diazine-3(4H)one 1,1-dioxides have been found to exhibit varying degrees of sedative and hypotensive activities (Khelili et al., 2012[Khelili, S., Kihal, N., Yekhlef, M., de Tullio, P., Lebrun, P. & Pirotte, B. (2012). Eur. J. Med. Chem. 54, 873-878.]). A number of benzo­thia­diazine 1,1-dioxide derivatives have recently been reported to display numerous biological activities (Tullio et al., 2011[Tullio, P. de, Servais, A.-C., Fillet, M., Gillotin, F., Somers, F., Chiap, P., Lebrun, P. & Pirotte, B. (2011). J. Med. Chem. 54, 8353-8361.]).

[Scheme 1]

In view of their broad spectrum of biological activities, and in a continuation of our work on this class of compound, we have synthesized the title compound, (1), and report herein on its spectroscopic analysis and crystal structure.

2. Structural commentary

The mol­ecular structure of the title mol­ecule is shown in Fig. 1[link]. The relative configuration of the asymmetric center is R for atom C7. The cyclo­hexane ring (C7–C12) adopts a chair conformation, confirmed by the puckering amplitude of Q = 0.4285 Å. The 1,2,4-thia­diazinane ring (N1/S1/C4/C3/N2/C7) adopts an envelope conformation with the flap atom N1 deviating by 0.565 (3) Å from the mean plane defined by atoms C7/N2/C3/C4/S1 [maximum deviation = 0.033 (1) Å for atom S1]. The mean plane of the cyclo­hexane ring is almost normal to the benzene ring (C1–C6) and the mean plane of the 1,2,4-thia­diazinane ring, making dihedral angles of 70.4 (2) and 71.43 (19)°, respectively. The dihedral angle between the benzene ring and the mean plane of the 1,2,4-thia­diazinane ring is 4.91 (18)°. The mol­ecular structure is stabilized by an intra­molecular C—H⋯O hydrogen bond, which forms an S(6) ring motif (Table 1[link] and Fig. 1[link]).

Table 1
Hydrogen-bond geometry (Å, °)

Cg is the centroid of the C1–C6 ring.

D—H⋯A D—H H⋯A DA D—H⋯A
C12—H12A⋯O1 0.97 2.40 3.066 (5) 126
N2—HN2⋯O1i 0.86 2.26 3.101 (5) 166
C11—H11ACgii 0.97 2.58 3.506 (5) 160
Symmetry codes: (i) [x+{\script{1\over 2}}, -y+{\script{1\over 2}}, z-{\script{1\over 2}}]; (ii) [x+{\script{1\over 2}}, -y+{\script{1\over 2}}, z+{\script{1\over 2}}].
[Figure 1]
Figure 1
A view of the mol­ecular structure of the title mol­ecule, showing the atom labelling. Displacement ellipsoids are drawn at the 50% probability level. The C—H⋯O hydrogen bond is shown as a dashed line (see Table 1[link] for details).

3. Supra­molecular features

In the crystal, mol­ecules are linked by N—H⋯O hydrogen bonds (Table 1[link] and Fig. 2[link]), forming chains with a C(6) graph-set motif along [10[\overline{1}]]. The chains are linked via structure-directing C—H⋯π inter­actions, leading to the formation of C(6) chains along [[\overline{1}]01]. These inter­actions lead to the formation of sheets parallel to (010) (Table 1[link] and Fig. 2[link]).

[Figure 2]
Figure 2
A view along the a axis of the crystal packing of the title compound. Hydrogen bonds are shown as thin blue lines (see Table 1[link] for details; H atoms not involved in hydrogen bonding have been omitted for clarity).

4. Database survey

In two similar structures, namely 6-bromo-4H-spiro­[1,2,4-benzo­thia­diazine-3,1′-cyclo­butane] 1,1-dioxide, (2) (Shinoj Kumar, 2014a[Shinoj Kumar, P. P., Suchetan, P. A., Sreenivasa, S., Naveen, S., Lokanath, N. K. & Aruna Kumar, D. B. (2014a). Private communication (deposition number 1023519). CCDC, Cambridge, England.], and 6-bromo-1′-ethyl-4H-spiro­[1,2,4-benzo­thia­diazine-3,4′-piperidine] 1,1-dioxide, (3) (Shinoj Kumar, 2014b[Shinoj Kumar, P. P., Suchetan, P. A., Sreenivasa, S., Naveen, S., Lokanath, N. K. & Aruna Kumar, D. B. (2014b). Private communication (deposition number 1023520). CCDC, Cambridge, England.], the 1,2,4-thia­diazinane rings adopt a twisted chair conformation, in contrast to the envelope conformation observed in (1). In (2), the dihedral angle between the benzene ring and the mean plane of the cyclo­butyl ring is 73.76 (1)°, while that between the benzene ring and the mean plane of the 1,2,4-thia­diazinane ring is 4.72 (1)°, and that between the mean plane of the cyclo­butyl ring and the mean plane of the 1,2,4-thia­diazinane ring is 78.44 (1)°. In (3), the same dihedral angles are similar, being 73.61 (1), 6.73 (1) and 73.81 (1)°, respectively. These angles are also similar to those observed in the title compound, (1).

5. Synthesis and crystallization

To a cooled solution of 2-amino-4-bromo­benzene sulfonamide (5 g, 19.9 mmol) and anhydrous magnesium sulfate (MgSO4; 3.5 g, 29.88 mmol) in dry toluene (60 ml), 3,3-di­methyl­cyclo­hexa­none (22 mmol) was added followed by slow addition of polyphospho­ric acid anhydride (T3P; 19 ml, 29.88 mmol, 50% solution in ethyl acetate). The reaction mixture was then refluxed in a sealed tube at 393 K for 6 h. It was cooled to 283 K and neutralized with saturated sodium bicarbonate solution (100 ml). The crude product was extracted with ethyl acetate (100 ml) and was finally washed with brine solution (50 ml). The organic phase was dried over anhydrous sodium sulfate and concentrated to give the crude product as a brown solid. It was then dissolved in a minimum amount of ethyl acetate (25 ml) and stirred for 1h in an ice-cooled bath, filtered and washed with cold ethyl acetate (10 ml × 2) to give pure compound (1) (4.5 g, 75% yield) as a white solid. Colourless prisms of the title compound were obtained by slow evaporation of a solution of the compound in ethyl acetate.

6. Spectroscopic characterization

The IR spectra of the title compound exhibits strong bands at 1374 cm−1 due to asymmetric (S=O) stretching and a band at 1165 cm−1 due to symmetric (S=O) stretching. Further, a single band appearing at 3110 cm−1 is due to the secondary N—H group of the sulfonamide, and a band at 3308 cm−1 confirms the cyclization of sulfonamide through condensation with the ketone. Appearance of bands in the range of 2970–2815 cm−1 is assigned to the C—H stretching is due to the presence of the saturated hydro­carbons. The 1H NMR spectrum shows peaks at δ 7.53 (s, 1H, SO2NH), 6.934–6.930 (d, 1H, Ar-H), 7.37–7.35 (d, 1H, Ar-H), 3.33 (s, 1H, NH), 2.51–1.28 (m, 9H, CH2), 0.9–1.1 (s, 6H, CH3). The 13C NMR spectrum shows peaks at δ 144 (C1), 119 (C2), 126 (C3), 127 (C4), 119 (C5), 118 (C6), 117 (C7), 71 (C8), 47 (C9), 36 (C10), 33 (C11), 31 (C12), 18 (C13 and C14). The LC–MS spectrum shows the appearance of mol­ecular ion peaks at m/z 358 and 357 values, confirming the structure of the compound.

7. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2[link]. The NH hydrogens were located in a difference Fourier map. N- and C-bound H atoms were included in calculated positions (N—H = 0.86 and C—H = 0.93–0.97 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.5Ueq(C) for methyl H atoms and 1.2Ueq(N,C) for other H atoms.

Table 2
Experimental details

Crystal data
Chemical formula C14H19BrN2O2S
Mr 359.28
Crystal system, space group Monoclinic, P21/n
Temperature (K) 293
a, b, c (Å) 6.4316 (7), 24.263 (3), 10.0829 (13)
β (°) 105.604 (9)
V3) 1515.5 (3)
Z 4
Radiation type Cu Kα
μ (mm−1) 5.01
Crystal size (mm) 0.44 × 0.24 × 0.19
 
Data collection
Diffractometer Bruker APEXII
Absorption correction Multi-scan (SADABS; Bruker, 2009[Bruker (2009). APEX2, SADABS, SAINT-Plus and XPREP. Bruker AXS Inc., Madison, Wisconsin, USA.])
Tmin, Tmax 0.271, 0.386
No. of measured, independent and observed [I > 2σ(I)] reflections 11574, 2515, 1860
Rint 0.081
(sin θ/λ)max−1) 0.586
 
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.049, 0.154, 0.94
No. of reflections 2515
No. of parameters 183
H-atom treatment H-atom parameters constrained
Δρmax, Δρmin (e Å−3) 0.61, −0.61
Computer programs: APEX2, SAINT-Plus and XPREP (Bruker, 2009[Bruker (2009). APEX2, SADABS, SAINT-Plus and XPREP. Bruker AXS Inc., Madison, Wisconsin, USA.]), SHELXS97 and SHELXL97 (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]), andMercury (Macrae et al., 2008[Macrae, C. F., Bruno, I. J., Chisholm, J. A., Edgington, P. R., McCabe, P., Pidcock, E., Rodriguez-Monge, L., Taylor, R., van de Streek, J. & Wood, P. A. (2008). J. Appl. Cryst. 41, 466-470.]).

Supporting information


Chemical context top

The sulfonamide class of drugs have been widely reported for their anti­bacterial and anti­fungal activities (Trujillo et al., 2009). 1,2,4-Benzo­thia­diazine 1,1-dioxides are used as anti­hypertensive, diuretic, anti­diabetic, glutamine­rgic neuro modulators (Cordi et al., 1996) and K-channel inhibitors (Di Bella et al., 1983). Further, benzo­thia­diazine-3-one 1,1-dioxide and its derivatives are reported for their potential hypoglycemic (Scozzafava et al., 2003), anti­cancer and anti-HIV activities (Casini et al., 2002), and they have been reported to serve as selective antagonists of CXR2 (Hayao et al., 1968). Also, 2-substituted-2H-1,2,4-benzo­thia­diazine-3(4H)one 1,1-dioxides has been found to exhibit varying degrees of sedative and hypotensive activities (Khelili et al., 2012). A number of benzo­thia­diazine 1,1-dioxide derivatives have recently been reported to display numerous biological activities (Tullio et al., 2011). In view of their broad spectrum of biological activities, and in a continuation of our work on this class of compound, we have synthesized the title compound, (1), and report herein on its spectroscopic analysis and crystal structure.

Structural commentary top

The molecular structure of the title molecule is shown in Fig. 1. The relative configuration of the asymmetric center is R for atom C7. The cyclo­hexane ring (C7–C12) adopts a chair conformation, confirmed by the puckering amplitude of Q = 0.4285 Å. The 1,2,4-thia­diazinane ring (N1/S1/C4/C3/N2/C7) adopts an envelope conformation with the flap atom N1 deviating by 0.565 (3) Å from the mean plane defined by atoms C7/N2/C3/C4/S1 [maximum deviation = 0.033 (1) Å for atom S1]. The mean plane of the cyclo­hexane ring is almost normal to the benzene ring (C1–C6) and the mean plane of the 1,2,4-thia­diazinane ring, making dihedral angles of 70.4 (2) and 71.43 (19)°, respectively. The dihedral angle between the benzene ring and the mean plane of the 1,2,4-thia­diazinane ring is 4.91 (18)°. The molecular structure is stabilized by an intra­molecular C—H···O hydrogen bond, which forms an S(6) ring motif (Table 1 and Fig. 1).

Supra­molecular features top

In the crystal, molecules are linked by N—H···O hydrogen bonds (Table 1 and Fig. 2), forming chains with a C(6) graph-set motif along [101]. The chains are linked via structure-directing C—H···π inter­actions, leading to the formation of C(6) chains along [101]. These inter­actions lead to the formation of sheets parallel to (010) (Table 1 and Fig. 2).

Database survey top

In two similar structures, namely 6-bromo-4H-spiro­[1,2,4-benzo­thia­diazine-3,1'-cyclo­butane] 1,1-dioxide, (2) (Shinoj Kumar, 2014a; [Please check added reference]), and 6-bromo-1'-ethyl-4H-spiro­[1,2,4-benzo­thia­diazine-3,4'-piperidine] 1,1-dioxide, (3) (Shinoj Kumar, 2014b; [Please check added reference]), the 1,2,4-thia­diazinane rings adopt a twisted chair conformation, in contrast to the envelope conformation observed in (1). In (2), the dihedral angle between the benzene ring and the mean plane of the cyclo­butyl ring is 73.76 (1)°, while that between the benzene ring and the mean plane of the 1,2,4-thia­diazinane ring is 4.72 (1)°, and that between the mean plane of the cyclo­butyl ring and the mean plane of the 1,2,4-thia­diazinane ring is 78.44 (1)°. In (3), the same dihedral angles are similar, being 73.61 (1), 6.73 (1) and 73.81 (1)°, respectively. These angles are also similar to those observed in the title compound, (1).

Synthesis and crystallization top

To a cooled solution of 2-amino-4-bromo­benzene sulfonamide (5 g, 19.9 mmol) and anhydrous magnesium sulfate (MgSO4; 3.5 g, 29.88 mmol) in dry toluene (60 ml), 3,3-di­methyl­cyclo­hexanone (22 mmol) was added followed by slow addition of polyphospho­ric acid anhydride (T3P; 19 ml, 29.88 mmol, 50% solution in ethyl acetate). The reaction mixture was then refluxed in a sealed tube at 393 K for 6 h. It was cooled to 283 K and neutralized with saturated sodium bicarbonate solution (100 ml). The crude product was extracted with ethyl acetate (100 ml) and was finally washed with brine solution (50 ml). The organic phase was dried over anhydrous sodium sulfate and concentrated to give the crude product as a brown solid. It was then dissolved in a minimum amount of ethyl acetate (25 ml) and stirred for 1h in an ice-cooled bath, filtered and washed with cold ethyl acetate (10 ml × 2) to give pure compound (1) (4.5 g, 75% yield) as a white solid. Colourless prisms of the title compound were obtained by slow evaporation of a solution of the compound in ethyl acetate.

Spectroscopic characterization top

The IR spectra of the title compound exhibits strong bands at 1374 cm-1 due to asymmetric (SO) stretching and a band at 1165 cm-1 due to symmetric (SO) stretching. Further, a single band appearing at 3110 cm-1 is due to the secondary N—H group of the sulfonamide, and a band at 3308 cm-1 confirms the cyclization of sulfonamide through condensation with the ketone. Appearance of bands in the range of 2970–2815 cm-1 is assigned to the C—H stretching is due to the presence of the saturated hydro­carbons. The 1H NMR spectrum shows peaks at δ 7.53 (s, 1H, SO2NH), 6.934–6.930 (d, 1H, Ar—H), 7.37–7.35 (d, 1H, Ar—H), 3.33 (s, 1H, NH), 2.51–1.28 (m, 9H, CH2), 0.9–1.1 (s, 6H, CH3). The 13C NMR spectrum shows peaks at δ 144 (C1), 119 (C2), 126 (C3), 127 (C4), 119 (C5), 118 (C6), 117 (C7), 71 (C8), 47 (C9), 36 (C10), 33 (C11), 31 (C12), 18 (C13 and C14). The LC–MS spectrum shows the appearance of molecular ion peaks at m/z 358 and 357 values, confirming the structure of the compound.

Refinement top

Crystal data, data collection and structure refinement details are summarized in Table 2. The NH hydrogens were located in a difference Fourier map. N- and C-bound H atoms were included in calculated positions (N—H = 0.86 and C—H = 0.93–0.97 Å) and allowed to ride on their parent atoms, with Uiso(H) = 1.5Ueq(C) for methyl H atoms and 1.2Ueq(N,C) for other H atoms.

Related literature top

For related literature, see: Casini et al. (2002); Cordi et al. (1996); Di Bella, Monzani, Andrisano, Fabio & Quaglio (1983); Hayao et al. (1968); Khelili et al. (2012); Scozzafava et al. (2003); Trujillo et al. (2009); Tullio et al. (2011).

Computing details top

Data collection: APEX2 (Bruker, 2009); cell refinement: APEX2 and SAINT-Plus (Bruker, 2009); data reduction: SAINT-Plus and XPREP (Bruker, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).

Figures top
A view of the molecular structure of the title molecule, showing the atom labelling. Displacement ellipsoids are drawn at the 50% probability level. The C—H···O hydrogen bond is shown as a dashed line (see Table 1 for details).

A view along the a axis of the crystal packing of the title compound. Hydrogen bonds are shown as thin blue lines (see Table 1 for details; H atoms not involved in hydrogen bonding have been omitted for clarity).
(R)-6'-Bromo-3,3-dimethyl-3',4'-dihydro-2'H-spiro[cyclohexane-\ 1,3'-1,2,4-benzothiadiazine] 1',1'-dioxide top
Crystal data top
C14H19BrN2O2SDx = 1.575 Mg m3
Mr = 359.28Melting point: 418 K
Monoclinic, P21/nCu Kα radiation, λ = 1.54178 Å
a = 6.4316 (7) ÅCell parameters from 123 reflections
b = 24.263 (3) Åθ = 7.1–64.6°
c = 10.0829 (13) ŵ = 5.01 mm1
β = 105.604 (9)°T = 293 K
V = 1515.5 (3) Å3Prism, colourless
Z = 40.44 × 0.24 × 0.19 mm
F(000) = 736
Data collection top
Bruker APEXII
diffractometer
1860 reflections with I > 2σ(I)
Radiation source: fine-focus sealed tubeRint = 0.081
Graphite monochromatorθmax = 64.6°, θmin = 7.1°
phi and ϕ scansh = 76
Absorption correction: multi-scan
(SADABS; Bruker, 2009)
k = 2827
Tmin = 0.271, Tmax = 0.386l = 1111
11574 measured reflections1 standard reflections every 1 reflections
2515 independent reflections intensity decay: 1%
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)] = 0.049Hydrogen site location: inferred from neighbouring sites
wR(F2) = 0.154H-atom parameters constrained
S = 0.94 w = 1/[σ2(Fo2) + (0.1058P)2 + 0.1836P]
where P = (Fo2 + 2Fc2)/3
2515 reflections(Δ/σ)max < 0.001
183 parametersΔρmax = 0.61 e Å3
0 restraintsΔρmin = 0.61 e Å3
Crystal data top
C14H19BrN2O2SV = 1515.5 (3) Å3
Mr = 359.28Z = 4
Monoclinic, P21/nCu Kα radiation
a = 6.4316 (7) ŵ = 5.01 mm1
b = 24.263 (3) ÅT = 293 K
c = 10.0829 (13) Å0.44 × 0.24 × 0.19 mm
β = 105.604 (9)°
Data collection top
Bruker APEXII
diffractometer
1860 reflections with I > 2σ(I)
Absorption correction: multi-scan
(SADABS; Bruker, 2009)
Rint = 0.081
Tmin = 0.271, Tmax = 0.3861 standard reflections every 1 reflections
11574 measured reflections intensity decay: 1%
2515 independent reflections
Refinement top
R[F2 > 2σ(F2)] = 0.0490 restraints
wR(F2) = 0.154H-atom parameters constrained
S = 0.94Δρmax = 0.61 e Å3
2515 reflectionsΔρmin = 0.61 e Å3
183 parameters
Special details top

Experimental. Melting points were determined in open capillaries and are uncorrected. The molecular structures of the synthesized compounds were established using IR, 1H NMR, 13C NMR and LC-MS studies. Solid state FT-IR Spectra were recorded as KBr discs on Jasco FT-IR Spectrometer. 1H NMR and 13C NMR were recorded in DMSO at 399.13 MHz and 75.50 MHz respectively on Bruker model avance II. All the chemical shifts were reported in parts per million (ppm) using tetramethyl silane (TMS) as an internal standard. Mass spectra of the compounds were recordedon Shimadzu LC-2010EV with ESI probe.

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

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
C10.0489 (7)0.09465 (19)0.8681 (5)0.0449 (11)
C20.0873 (7)0.14863 (18)0.8441 (4)0.0398 (10)
H20.18730.15750.79590.048*
C30.0244 (6)0.19093 (16)0.8922 (4)0.0336 (9)
C40.1634 (6)0.17472 (17)0.9715 (4)0.0334 (9)
C50.2014 (7)0.11957 (18)0.9908 (4)0.0419 (10)
H50.29920.11011.04010.050*
C60.0993 (8)0.07862 (19)0.9394 (5)0.0465 (11)
H60.12750.04160.95140.056*
C70.0697 (6)0.29279 (16)0.9203 (4)0.0327 (9)
C80.1071 (7)0.33969 (17)0.8148 (4)0.0392 (10)
H8A0.22880.32970.73840.047*
H8B0.01860.34190.77920.047*
C90.1502 (7)0.39760 (18)0.8637 (5)0.0444 (11)
C100.0144 (8)0.41054 (18)1.0010 (5)0.0491 (11)
H10A0.02740.44441.03820.059*
H10B0.15470.41650.98480.059*
C110.0326 (8)0.36432 (19)1.1071 (4)0.0464 (11)
H11A0.13880.37441.19180.056*
H11B0.10530.35951.12770.056*
C120.0987 (6)0.31045 (18)1.0527 (4)0.0378 (10)
H12A0.11270.28191.12200.045*
H12B0.23790.31501.03390.045*
C130.3793 (8)0.4038 (2)0.8792 (6)0.0579 (13)
H13A0.39140.38380.95900.087*
H13B0.48090.38930.79880.087*
H13C0.40940.44200.88950.087*
C140.1192 (10)0.4391 (2)0.7572 (6)0.0657 (15)
H14A0.14520.47560.78560.098*
H14B0.21870.43110.66970.098*
H14C0.02590.43660.74920.098*
N10.2810 (5)0.27879 (14)0.9457 (3)0.0342 (8)
HN10.39300.29880.91170.041*
N20.0041 (5)0.24419 (14)0.8593 (4)0.0373 (8)
HN20.07120.24990.79740.045*
O10.1804 (5)0.23557 (14)1.1797 (3)0.0442 (8)
O20.5208 (4)0.21181 (13)1.0131 (3)0.0469 (8)
S10.29684 (15)0.22511 (4)1.03879 (10)0.0352 (3)
Br10.20573 (10)0.03945 (2)0.80348 (7)0.0701 (3)
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
C10.043 (3)0.043 (3)0.047 (3)0.001 (2)0.010 (2)0.002 (2)
C20.041 (2)0.038 (2)0.044 (2)0.0026 (19)0.0185 (19)0.0035 (18)
C30.035 (2)0.031 (2)0.033 (2)0.0009 (17)0.0070 (16)0.0000 (16)
C40.032 (2)0.040 (2)0.030 (2)0.0002 (17)0.0097 (16)0.0006 (16)
C50.048 (3)0.045 (2)0.036 (2)0.002 (2)0.0182 (19)0.0046 (19)
C60.057 (3)0.037 (2)0.046 (3)0.001 (2)0.013 (2)0.008 (2)
C70.030 (2)0.034 (2)0.035 (2)0.0003 (17)0.0117 (16)0.0038 (16)
C80.046 (2)0.041 (3)0.032 (2)0.006 (2)0.0119 (18)0.0009 (18)
C90.052 (3)0.037 (2)0.044 (3)0.003 (2)0.013 (2)0.0022 (19)
C100.058 (3)0.037 (3)0.049 (3)0.004 (2)0.010 (2)0.010 (2)
C110.050 (3)0.048 (3)0.034 (2)0.002 (2)0.0005 (19)0.009 (2)
C120.030 (2)0.043 (2)0.037 (2)0.0027 (18)0.0044 (17)0.0009 (18)
C130.049 (3)0.055 (3)0.067 (3)0.014 (2)0.009 (2)0.001 (3)
C140.091 (4)0.052 (3)0.051 (3)0.000 (3)0.013 (3)0.011 (2)
N10.0267 (16)0.040 (2)0.0370 (19)0.0074 (14)0.0098 (14)0.0041 (15)
N20.0420 (19)0.0343 (19)0.044 (2)0.0006 (15)0.0265 (16)0.0026 (15)
O10.0478 (18)0.060 (2)0.0258 (15)0.0024 (15)0.0112 (13)0.0019 (13)
O20.0286 (15)0.058 (2)0.0562 (19)0.0040 (14)0.0153 (13)0.0033 (15)
S10.0322 (5)0.0435 (6)0.0322 (6)0.0004 (4)0.0126 (4)0.0007 (4)
Br10.0868 (5)0.0414 (4)0.0966 (6)0.0091 (3)0.0495 (4)0.0070 (3)
Geometric parameters (Å, º) top
C1—C21.366 (6)C9—C101.533 (6)
C1—C61.394 (6)C10—C111.533 (6)
C1—Br11.894 (5)C10—H10A0.9700
C2—C31.412 (6)C10—H10B0.9700
C2—H20.9300C11—C121.522 (6)
C3—N21.359 (5)C11—H11A0.9700
C3—C41.407 (5)C11—H11B0.9700
C4—C51.383 (6)C12—H12A0.9700
C4—S11.733 (4)C12—H12B0.9700
C5—C61.368 (6)C13—H13A0.9600
C5—H50.9300C13—H13B0.9600
C6—H60.9300C13—H13C0.9600
C7—N21.466 (5)C14—H14A0.9600
C7—N11.489 (5)C14—H14B0.9600
C7—C81.532 (6)C14—H14C0.9600
C7—C121.537 (5)N1—S11.624 (3)
C8—C91.539 (6)N1—HN10.8600
C8—H8A0.9700N2—HN20.8600
C8—H8B0.9700O1—S11.439 (3)
C9—C131.530 (6)O2—S11.430 (3)
C9—C141.523 (6)
C2—C1—C6122.7 (4)C9—C10—H10B109.1
C2—C1—Br1118.6 (3)C11—C10—H10B109.1
C6—C1—Br1118.8 (4)H10A—C10—H10B107.8
C1—C2—C3120.2 (4)C12—C11—C10110.7 (4)
C1—C2—H2119.9C12—C11—H11A109.5
C3—C2—H2119.9C10—C11—H11A109.5
N2—C3—C2119.5 (4)C12—C11—H11B109.5
N2—C3—C4123.6 (4)C10—C11—H11B109.5
C2—C3—C4116.9 (4)H11A—C11—H11B108.1
C5—C4—C3120.9 (4)C11—C12—C7110.7 (3)
C5—C4—S1120.2 (3)C11—C12—H12A109.5
C3—C4—S1118.8 (3)C7—C12—H12A109.5
C6—C5—C4121.9 (4)C11—C12—H12B109.5
C6—C5—H5119.0C7—C12—H12B109.5
C4—C5—H5119.0H12A—C12—H12B108.1
C5—C6—C1117.2 (4)C9—C13—H13A109.5
C5—C6—H6121.4C9—C13—H13B109.5
C1—C6—H6121.4H13A—C13—H13B109.5
N2—C7—N1107.6 (3)C9—C13—H13C109.5
N2—C7—C8108.3 (3)H13A—C13—H13C109.5
N1—C7—C8108.0 (3)H13B—C13—H13C109.5
N2—C7—C12110.9 (3)C9—C14—H14A109.5
N1—C7—C12112.1 (3)C9—C14—H14B109.5
C8—C7—C12109.8 (3)H14A—C14—H14B109.5
C7—C8—C9117.6 (3)C9—C14—H14C109.5
C7—C8—H8A107.9H14A—C14—H14C109.5
C9—C8—H8A107.9H14B—C14—H14C109.5
C7—C8—H8B107.9C7—N1—S1119.0 (3)
C9—C8—H8B107.9C7—N1—HN1120.5
H8A—C8—H8B107.2S1—N1—HN1120.5
C13—C9—C14108.7 (4)C3—N2—C7125.6 (3)
C13—C9—C10109.8 (4)C3—N2—HN2117.2
C14—C9—C10108.2 (4)C7—N2—HN2117.2
C13—C9—C8112.6 (4)O2—S1—O1116.72 (18)
C14—C9—C8107.9 (4)O2—S1—N1107.04 (18)
C10—C9—C8109.6 (4)O1—S1—N1109.40 (19)
C9—C10—C11112.7 (4)O2—S1—C4110.51 (19)
C9—C10—H10A109.1O1—S1—C4109.26 (18)
C11—C10—H10A109.1N1—S1—C4103.01 (17)
C6—C1—C2—C30.2 (7)C9—C10—C11—C1258.9 (5)
Br1—C1—C2—C3179.2 (3)C10—C11—C12—C760.5 (5)
C1—C2—C3—N2175.4 (4)N2—C7—C12—C11173.9 (3)
C1—C2—C3—C43.8 (6)N1—C7—C12—C1165.8 (4)
N2—C3—C4—C5173.8 (4)C8—C7—C12—C1154.3 (4)
C2—C3—C4—C55.3 (6)N2—C7—N1—S155.6 (4)
N2—C3—C4—S13.3 (5)C8—C7—N1—S1172.3 (3)
C2—C3—C4—S1177.6 (3)C12—C7—N1—S166.6 (4)
C3—C4—C5—C62.9 (6)C2—C3—N2—C7168.8 (4)
S1—C4—C5—C6180.0 (3)C4—C3—N2—C712.1 (6)
C4—C5—C6—C11.1 (7)N1—C7—N2—C336.3 (5)
C2—C1—C6—C52.7 (7)C8—C7—N2—C3152.8 (4)
Br1—C1—C6—C5176.7 (3)C12—C7—N2—C386.6 (5)
N2—C7—C8—C9170.4 (3)C7—N1—S1—O2163.1 (3)
N1—C7—C8—C973.3 (4)C7—N1—S1—O169.6 (3)
C12—C7—C8—C949.2 (5)C7—N1—S1—C446.5 (3)
C7—C8—C9—C1375.8 (5)C5—C4—S1—O244.6 (4)
C7—C8—C9—C14164.3 (4)C3—C4—S1—O2132.5 (3)
C7—C8—C9—C1046.7 (5)C5—C4—S1—O185.1 (4)
C13—C9—C10—C1174.3 (5)C3—C4—S1—O197.7 (3)
C14—C9—C10—C11167.3 (4)C5—C4—S1—N1158.6 (3)
C8—C9—C10—C1149.9 (5)C3—C4—S1—N118.5 (3)
Hydrogen-bond geometry (Å, º) top
Cg is the centroid of the C1–C6 ring.
D—H···AD—HH···AD···AD—H···A
C12—H12A···O10.972.403.066 (5)126
N2—HN2···O1i0.862.263.101 (5)166
C11—H11A···Cgii0.972.583.506 (5)160
Symmetry codes: (i) x+1/2, y+1/2, z1/2; (ii) x+1/2, y+1/2, z+1/2.
Hydrogen-bond geometry (Å, º) top
Cg is the centroid of the C1–C6 ring.
D—H···AD—HH···AD···AD—H···A
C12—H12A···O10.972.3973.066 (5)126
N2—HN2···O1i0.862.263.101 (5)166
C11—H11A···Cgii0.972.583.506 (5)160
Symmetry codes: (i) x+1/2, y+1/2, z1/2; (ii) x+1/2, y+1/2, z+1/2.

Experimental details

Crystal data
Chemical formulaC14H19BrN2O2S
Mr359.28
Crystal system, space groupMonoclinic, P21/n
Temperature (K)293
a, b, c (Å)6.4316 (7), 24.263 (3), 10.0829 (13)
β (°) 105.604 (9)
V3)1515.5 (3)
Z4
Radiation typeCu Kα
µ (mm1)5.01
Crystal size (mm)0.44 × 0.24 × 0.19
Data collection
DiffractometerBruker APEXII
diffractometer
Absorption correctionMulti-scan
(SADABS; Bruker, 2009)
Tmin, Tmax0.271, 0.386
No. of measured, independent and
observed [I > 2σ(I)] reflections
11574, 2515, 1860
Rint0.081
(sin θ/λ)max1)0.586
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.049, 0.154, 0.94
No. of reflections2515
No. of parameters183
H-atom treatmentH-atom parameters constrained
Δρmax, Δρmin (e Å3)0.61, 0.61

Computer programs: APEX2 (Bruker, 2009), APEX2 and SAINT-Plus (Bruker, 2009), SAINT-Plus and XPREP (Bruker, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), Mercury (Macrae et al., 2008).

 

Acknowledgements

The authors acknowledge the IOE X-ray diffractometer facility, University of Mysore, Mysore, for the data collection. PPSK, PAS, SS and DBAK are thankful to Tumkur University for providing the laboratory and instrumental facilities to carry out this work.

References

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