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

Shinoj Kumar, P.P.; Suchetan, P.A.; Sreenivasa, S.; Naveen, S.; Lokanath, N.K.; Aruna Kumar, D.B.

doi:10.1107/S1600536814022417

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ISSN: 2056-9890

Volume 70| Part 11| November 2014| Pages 359-361

doi:10.1107/S1600536814022417

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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

P. P. Shinoj Kumar,^a P. A. Suchetan,^b S. Sreenivasa,^a S. Naveen,^c N. K. Lokanath ^d and D. B. Aruna Kumar ^a ^*

^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).

Keywords: crystal structure; benzothiadiazine; hydrogen bonding; chirality.

CCDC reference: 1028895

1. Chemical context

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 ). Furthermore, benzothiadiazine-3-one 1,1-dioxide and its derivatives have been reported for their potential hypoglycemic (Scozzafava et al., 2003 ), anticancer and anti-HIV activities (Casini et al., 2002 ), and they have also been reported to serve as selective antagonists of CXR2 (Hayao et al., 1968 ). 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 ). 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.

2. Structural commentary

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).

Table 1
Hydrogen-bond geometry (Å, °)

Cg is the centroid of the C1–C6 ring.

D—H⋯A	D—H	H⋯A	D⋯A	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—H11A⋯Cgⁱⁱ	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
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).

3. Supramolecular features

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 [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 and Fig. 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

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 , and 6-bromo-1′-ethyl-4H-spiro[1,2,4-benzothiadiazine-3,4′-piperidine] 1,1-dioxide, (3) (Shinoj Kumar, 2014b , 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. 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 U_iso(H) = 1.5U_eq(C) for methyl H atoms and 1.2U_eq(N,C) for other H atoms.

Table 2
Experimental details

Crystal data
Chemical formula	C₁₄H₁₉BrN₂O₂S
M_r	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)
V (Å³)	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 )
T_min, T_max	0.271, 0.386
No. of measured, independent and observed [I > 2σ(I)] reflections	11574, 2515, 1860
R_int	0.081
(sin θ/λ)_max (Å⁻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
Δρ_max, Δρ_min (e Å⁻³)	0.61, −0.61
Computer programs: APEX2, SAINT-Plus and XPREP (Bruker, 2009), SHELXS97 and SHELXL97 (Sheldrick, 2008 ), andMercury (Macrae et al., 2008 ).

Supporting information

CCDC reference: 1028895

Crystal structure: contains datablocks 1, Global. DOI: 10.1107/S1600536814022417/su2797sup1.cif

Structure factors: contains datablock 1. DOI: 10.1107/S1600536814022417/su27971sup2.hkl

checkCIF report

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

Spectroscopic characterization top

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.

Refinement top

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

C₁₄H₁₉BrN₂O₂S	D_x = 1.575 Mg m⁻³
M_r = 359.28	Melting point: 418 K
Monoclinic, P2₁/n	Cu Kα radiation, λ = 1.54178 Å
a = 6.4316 (7) Å	Cell parameters from 123 reflections
b = 24.263 (3) Å	θ = 7.1–64.6°
c = 10.0829 (13) Å	µ = 5.01 mm⁻¹
β = 105.604 (9)°	T = 293 K
V = 1515.5 (3) Å³	Prism, colourless
Z = 4	0.44 × 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 tube	R_int = 0.081
Graphite monochromator	θ_max = 64.6°, θ_min = 7.1°
phi and ϕ scans	h = −7→6
Absorption correction: multi-scan (SADABS; Bruker, 2009)	k = −28→27
T_min = 0.271, T_max = 0.386	l = −11→11
11574 measured reflections	1 standard reflections every 1 reflections
2515 independent reflections	intensity decay: 1%

Refinement top

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)] = 0.049	Hydrogen site location: inferred from neighbouring sites
wR(F²) = 0.154	H-atom parameters constrained
S = 0.94	w = 1/[σ²(F_o²) + (0.1058P)² + 0.1836P] where P = (F_o² + 2F_c²)/3
2515 reflections	(Δ/σ)_max < 0.001
183 parameters	Δρ_max = 0.61 e Å⁻³
0 restraints	Δρ_min = −0.61 e Å⁻³

Crystal data top

C₁₄H₁₉BrN₂O₂S	V = 1515.5 (3) Å³
M_r = 359.28	Z = 4
Monoclinic, P2₁/n	Cu Kα radiation
a = 6.4316 (7) Å	µ = 5.01 mm⁻¹
b = 24.263 (3) Å	T = 293 K
c = 10.0829 (13) Å	0.44 × 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)	R_int = 0.081
T_min = 0.271, T_max = 0.386	1 standard reflections every 1 reflections
11574 measured reflections	intensity decay: 1%
2515 independent reflections

Refinement top

R[F² > 2σ(F²)] = 0.049	0 restraints
wR(F²) = 0.154	H-atom parameters constrained
S = 0.94	Δρ_max = 0.61 e Å⁻³
2515 reflections	Δρ_min = −0.61 e Å⁻³
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

	x	y	z	U_iso*/U_eq
C1	0.0489 (7)	0.09465 (19)	0.8681 (5)	0.0449 (11)
C2	0.0873 (7)	0.14863 (18)	0.8441 (4)	0.0398 (10)
H2	0.1873	0.1575	0.7959	0.048*
C3	−0.0244 (6)	0.19093 (16)	0.8922 (4)	0.0336 (9)
C4	−0.1634 (6)	0.17472 (17)	0.9715 (4)	0.0334 (9)
C5	−0.2014 (7)	0.11957 (18)	0.9908 (4)	0.0419 (10)
H5	−0.2992	0.1101	1.0401	0.050*
C6	−0.0993 (8)	0.07862 (19)	0.9394 (5)	0.0465 (11)
H6	−0.1275	0.0416	0.9514	0.056*
C7	−0.0697 (6)	0.29279 (16)	0.9203 (4)	0.0327 (9)
C8	−0.1071 (7)	0.33969 (17)	0.8148 (4)	0.0392 (10)
H8A	−0.2288	0.3297	0.7384	0.047*
H8B	0.0186	0.3419	0.7792	0.047*
C9	−0.1502 (7)	0.39760 (18)	0.8637 (5)	0.0444 (11)
C10	0.0144 (8)	0.41054 (18)	1.0010 (5)	0.0491 (11)
H10A	−0.0274	0.4444	1.0382	0.059*
H10B	0.1547	0.4165	0.9848	0.059*
C11	0.0326 (8)	0.36432 (19)	1.1071 (4)	0.0464 (11)
H11A	0.1388	0.3744	1.1918	0.056*
H11B	−0.1053	0.3595	1.1277	0.056*
C12	0.0987 (6)	0.31045 (18)	1.0527 (4)	0.0378 (10)
H12A	0.1127	0.2819	1.1220	0.045*
H12B	0.2379	0.3150	1.0339	0.045*
C13	−0.3793 (8)	0.4038 (2)	0.8792 (6)	0.0579 (13)
H13A	−0.3914	0.3838	0.9590	0.087*
H13B	−0.4809	0.3893	0.7988	0.087*
H13C	−0.4094	0.4420	0.8895	0.087*
C14	−0.1192 (10)	0.4391 (2)	0.7572 (6)	0.0657 (15)
H14A	−0.1452	0.4756	0.7856	0.098*
H14B	−0.2187	0.4311	0.6697	0.098*
H14C	0.0259	0.4366	0.7492	0.098*
N1	−0.2810 (5)	0.27879 (14)	0.9457 (3)	0.0342 (8)
HN1	−0.3930	0.2988	0.9117	0.041*
N2	0.0041 (5)	0.24419 (14)	0.8593 (4)	0.0373 (8)
HN2	0.0712	0.2499	0.7974	0.045*
O1	−0.1804 (5)	0.23557 (14)	1.1797 (3)	0.0442 (8)
O2	−0.5208 (4)	0.21181 (13)	1.0131 (3)	0.0469 (8)
S1	−0.29684 (15)	0.22511 (4)	1.03879 (10)	0.0352 (3)
Br1	0.20573 (10)	0.03945 (2)	0.80348 (7)	0.0701 (3)

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
C1	0.043 (3)	0.043 (3)	0.047 (3)	−0.001 (2)	0.010 (2)	−0.002 (2)
C2	0.041 (2)	0.038 (2)	0.044 (2)	−0.0026 (19)	0.0185 (19)	−0.0035 (18)
C3	0.035 (2)	0.031 (2)	0.033 (2)	−0.0009 (17)	0.0070 (16)	0.0000 (16)
C4	0.032 (2)	0.040 (2)	0.030 (2)	−0.0002 (17)	0.0097 (16)	0.0006 (16)
C5	0.048 (3)	0.045 (2)	0.036 (2)	−0.002 (2)	0.0182 (19)	0.0046 (19)
C6	0.057 (3)	0.037 (2)	0.046 (3)	−0.001 (2)	0.013 (2)	0.008 (2)
C7	0.030 (2)	0.034 (2)	0.035 (2)	0.0003 (17)	0.0117 (16)	−0.0038 (16)
C8	0.046 (2)	0.041 (3)	0.032 (2)	−0.006 (2)	0.0119 (18)	−0.0009 (18)
C9	0.052 (3)	0.037 (2)	0.044 (3)	−0.003 (2)	0.013 (2)	0.0022 (19)
C10	0.058 (3)	0.037 (3)	0.049 (3)	−0.004 (2)	0.010 (2)	−0.010 (2)
C11	0.050 (3)	0.048 (3)	0.034 (2)	−0.002 (2)	0.0005 (19)	−0.009 (2)
C12	0.030 (2)	0.043 (2)	0.037 (2)	−0.0027 (18)	0.0044 (17)	0.0009 (18)
C13	0.049 (3)	0.055 (3)	0.067 (3)	0.014 (2)	0.009 (2)	0.001 (3)
C14	0.091 (4)	0.052 (3)	0.051 (3)	0.000 (3)	0.013 (3)	0.011 (2)
N1	0.0267 (16)	0.040 (2)	0.0370 (19)	0.0074 (14)	0.0098 (14)	0.0041 (15)
N2	0.0420 (19)	0.0343 (19)	0.044 (2)	−0.0006 (15)	0.0265 (16)	−0.0026 (15)
O1	0.0478 (18)	0.060 (2)	0.0258 (15)	0.0024 (15)	0.0112 (13)	−0.0019 (13)
O2	0.0286 (15)	0.058 (2)	0.0562 (19)	−0.0040 (14)	0.0153 (13)	0.0033 (15)
S1	0.0322 (5)	0.0435 (6)	0.0322 (6)	0.0004 (4)	0.0126 (4)	0.0007 (4)
Br1	0.0868 (5)	0.0414 (4)	0.0966 (6)	0.0091 (3)	0.0495 (4)	−0.0070 (3)

Geometric parameters (Å, º) top

C1—C2	1.366 (6)	C9—C10	1.533 (6)
C1—C6	1.394 (6)	C10—C11	1.533 (6)
C1—Br1	1.894 (5)	C10—H10A	0.9700
C2—C3	1.412 (6)	C10—H10B	0.9700
C2—H2	0.9300	C11—C12	1.522 (6)
C3—N2	1.359 (5)	C11—H11A	0.9700
C3—C4	1.407 (5)	C11—H11B	0.9700
C4—C5	1.383 (6)	C12—H12A	0.9700
C4—S1	1.733 (4)	C12—H12B	0.9700
C5—C6	1.368 (6)	C13—H13A	0.9600
C5—H5	0.9300	C13—H13B	0.9600
C6—H6	0.9300	C13—H13C	0.9600
C7—N2	1.466 (5)	C14—H14A	0.9600
C7—N1	1.489 (5)	C14—H14B	0.9600
C7—C8	1.532 (6)	C14—H14C	0.9600
C7—C12	1.537 (5)	N1—S1	1.624 (3)
C8—C9	1.539 (6)	N1—HN1	0.8600
C8—H8A	0.9700	N2—HN2	0.8600
C8—H8B	0.9700	O1—S1	1.439 (3)
C9—C13	1.530 (6)	O2—S1	1.430 (3)
C9—C14	1.523 (6)

C2—C1—C6	122.7 (4)	C9—C10—H10B	109.1
C2—C1—Br1	118.6 (3)	C11—C10—H10B	109.1
C6—C1—Br1	118.8 (4)	H10A—C10—H10B	107.8
C1—C2—C3	120.2 (4)	C12—C11—C10	110.7 (4)
C1—C2—H2	119.9	C12—C11—H11A	109.5
C3—C2—H2	119.9	C10—C11—H11A	109.5
N2—C3—C2	119.5 (4)	C12—C11—H11B	109.5
N2—C3—C4	123.6 (4)	C10—C11—H11B	109.5
C2—C3—C4	116.9 (4)	H11A—C11—H11B	108.1
C5—C4—C3	120.9 (4)	C11—C12—C7	110.7 (3)
C5—C4—S1	120.2 (3)	C11—C12—H12A	109.5
C3—C4—S1	118.8 (3)	C7—C12—H12A	109.5
C6—C5—C4	121.9 (4)	C11—C12—H12B	109.5
C6—C5—H5	119.0	C7—C12—H12B	109.5
C4—C5—H5	119.0	H12A—C12—H12B	108.1
C5—C6—C1	117.2 (4)	C9—C13—H13A	109.5
C5—C6—H6	121.4	C9—C13—H13B	109.5
C1—C6—H6	121.4	H13A—C13—H13B	109.5
N2—C7—N1	107.6 (3)	C9—C13—H13C	109.5
N2—C7—C8	108.3 (3)	H13A—C13—H13C	109.5
N1—C7—C8	108.0 (3)	H13B—C13—H13C	109.5
N2—C7—C12	110.9 (3)	C9—C14—H14A	109.5
N1—C7—C12	112.1 (3)	C9—C14—H14B	109.5
C8—C7—C12	109.8 (3)	H14A—C14—H14B	109.5
C7—C8—C9	117.6 (3)	C9—C14—H14C	109.5
C7—C8—H8A	107.9	H14A—C14—H14C	109.5
C9—C8—H8A	107.9	H14B—C14—H14C	109.5
C7—C8—H8B	107.9	C7—N1—S1	119.0 (3)
C9—C8—H8B	107.9	C7—N1—HN1	120.5
H8A—C8—H8B	107.2	S1—N1—HN1	120.5
C13—C9—C14	108.7 (4)	C3—N2—C7	125.6 (3)
C13—C9—C10	109.8 (4)	C3—N2—HN2	117.2
C14—C9—C10	108.2 (4)	C7—N2—HN2	117.2
C13—C9—C8	112.6 (4)	O2—S1—O1	116.72 (18)
C14—C9—C8	107.9 (4)	O2—S1—N1	107.04 (18)
C10—C9—C8	109.6 (4)	O1—S1—N1	109.40 (19)
C9—C10—C11	112.7 (4)	O2—S1—C4	110.51 (19)
C9—C10—H10A	109.1	O1—S1—C4	109.26 (18)
C11—C10—H10A	109.1	N1—S1—C4	103.01 (17)

C6—C1—C2—C3	0.2 (7)	C9—C10—C11—C12	58.9 (5)
Br1—C1—C2—C3	−179.2 (3)	C10—C11—C12—C7	−60.5 (5)
C1—C2—C3—N2	−175.4 (4)	N2—C7—C12—C11	173.9 (3)
C1—C2—C3—C4	3.8 (6)	N1—C7—C12—C11	−65.8 (4)
N2—C3—C4—C5	173.8 (4)	C8—C7—C12—C11	54.3 (4)
C2—C3—C4—C5	−5.3 (6)	N2—C7—N1—S1	55.6 (4)
N2—C3—C4—S1	−3.3 (5)	C8—C7—N1—S1	172.3 (3)
C2—C3—C4—S1	177.6 (3)	C12—C7—N1—S1	−66.6 (4)
C3—C4—C5—C6	2.9 (6)	C2—C3—N2—C7	−168.8 (4)
S1—C4—C5—C6	−180.0 (3)	C4—C3—N2—C7	12.1 (6)
C4—C5—C6—C1	1.1 (7)	N1—C7—N2—C3	−36.3 (5)
C2—C1—C6—C5	−2.7 (7)	C8—C7—N2—C3	−152.8 (4)
Br1—C1—C6—C5	176.7 (3)	C12—C7—N2—C3	86.6 (5)
N2—C7—C8—C9	−170.4 (3)	C7—N1—S1—O2	−163.1 (3)
N1—C7—C8—C9	73.3 (4)	C7—N1—S1—O1	69.6 (3)
C12—C7—C8—C9	−49.2 (5)	C7—N1—S1—C4	−46.5 (3)
C7—C8—C9—C13	−75.8 (5)	C5—C4—S1—O2	−44.6 (4)
C7—C8—C9—C14	164.3 (4)	C3—C4—S1—O2	132.5 (3)
C7—C8—C9—C10	46.7 (5)	C5—C4—S1—O1	85.1 (4)
C13—C9—C10—C11	74.3 (5)	C3—C4—S1—O1	−97.7 (3)
C14—C9—C10—C11	−167.3 (4)	C5—C4—S1—N1	−158.6 (3)
C8—C9—C10—C11	−49.9 (5)	C3—C4—S1—N1	18.5 (3)

Hydrogen-bond geometry (Å, º) top

Cg is the centroid of the C1–C6 ring.

D—H···A	D—H	H···A	D···A	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—H11A···Cgⁱⁱ	0.97	2.58	3.506 (5)	160

Symmetry codes: (i) x+1/2, −y+1/2, z−1/2; (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···A	D—H	H···A	D···A	D—H···A
C12—H12A···O1	0.97	2.397	3.066 (5)	126
N2—HN2···O1ⁱ	0.86	2.26	3.101 (5)	166
C11—H11A···Cgⁱⁱ	0.97	2.58	3.506 (5)	160

Symmetry codes: (i) x+1/2, −y+1/2, z−1/2; (ii) x+1/2, −y+1/2, z+1/2.

Experimental details

Crystal data
Chemical formula	C₁₄H₁₉BrN₂O₂S
M_r	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)
V (Å³)	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 diffractometer
Absorption correction	Multi-scan (SADABS; Bruker, 2009)
T_min, T_max	0.271, 0.386
No. of measured, independent and observed [I > 2σ(I)] reflections	11574, 2515, 1860
R_int	0.081
(sin θ/λ)_max (Å⁻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
Δρ_max, Δρ_min (e Å⁻³)	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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Volume 70| Part 11| November 2014| Pages 359-361

doi:10.1107/S1600536814022417

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research communications\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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

1. Chemical context

2. Structural commentary

3. Supra­molecular features

4. Database survey

5. Synthesis and crystallization

6. Spectroscopic characterization

7. Refinement

Supporting information

Acknowledgements

References

research communications

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

3. Supramolecular features