organic compounds
4-(1H-Benzimidazol-2-ylmethyl)-2H-1,4-benzothiazin-3(4H)-one
aX-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, 11800 USM, Penang, Malaysia, and bDepartment of Studies in Chemistry, Mangalore University, Mangalagangotri, Mangalore 574 199, India
*Correspondence e-mail: hkfun@usm.my
In the title compound, C16H13N3OS, the thiomorpholine ring exists in a screw boat conformation. The angle between the benzimidazole ring system and the benzene ring fused to the thiazine ring is 67.22 (6)°. In the crystal, molecules form infinite chains along the a axis via intermolecular N—H⋯N interactions. C—H⋯π interactions also contribute to the stability of the crystal structure.
Related literature
For the biological activity of molecules containing 1H-benzimidazole, see: Sridhar & Ramesh (2001); Guven et al. (2007); Nofal et al. (2002); Pedini et al. (1994). For a related structure, see: Fun et al. (2009). For ring puckering parameters, see: Cremer & Pople (1975). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2009); cell SAINT (Bruker, 2009); data reduction: SAINT; program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL and PLATON (Spek, 2009).
Supporting information
https://doi.org/10.1107/S1600536810019367/wn2387sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810019367/wn2387Isup2.hkl
A mixture of 2-(3-oxo-2,3-dihydro-4H-1,4-benzothiazin-4-yl)acetic acid (3.3 mmol) (Fun et al., 2009) and o-phenylenediamine (2.2 mmol) was heated at 140 °C under solvent-free conditions for 3 h and completion of the reaction was checked by TLC. The reaction mixture was cooled to room temperature and the solid product was washed with a
of sodium bicarbonate to yield 4-(1H-benzimidazol-2-ylmethyl)-2H-1,4-benzothiazin-3(4H)-one as a red solid. Single crystals suitable for X-ray analysis were obtained by crystallization from absolute ethanol under slow evaporation (M.p. 493 K).The H atom attached to N1 was located in a difference map and refined isotropically; N1—H1N1 = 0.86 (2) Å. The carbon-bound H atoms were positioned geometrically [C—H = 0.93 or 0.97 Å] and were refined using a riding model, with Uiso(H) = 1.2Ueq(C).
A number of molecules containing the 1H-benzimidazole nucleus exhibit a broad spectrum of biological activity, including anti-inflammatory (Sridhar et al., 2001), antifungal (Guven et al., 2007), antibacterial (Nofal et al., 2002) and anthelmintic (Pedini et al., 1994) properties. With these results in mind, we have paid particular attention to the preparation of derivatives of 1H-benzimidazole and we report here the
of the title compound, a 1H-benzimidazole derivative containing 2H-1,4-benzothiazin-3(4H)-one.The bond lengths and angles are within normal ranges. The thiomorpholine ring (C1, C6-C8, N3, S1) adopts a screw boat confirmation with puckering parameters (Cremer & Pople, 1975) being Q = 0.6563 (13) Å; θ = 66.76 (12)° and φ = 334.16 (14)°. The angle between the benzimidazole ring system and the benzene ring fused to the thiazine ring is 67.22 (6)°.
The intermolecular interaction N1—H1N1···N2 links the molecules to form infinite chains along the a-axis. The π interactions involving the C1-C6 (Cg1) and C11-C16 (Cg2) benzene rings (Table 1).
is further stabilized by C—H···For the biological activity of molecules containing 1H-benzimidazole, see: Sridhar et al. (2001); Guven et al. (2007); Nofal et al. (2002); Pedini et al. (1994). For a related structure, see: Fun et al. (2009). For ring puckering parameters, see: Cremer & Pople (1975). For the stability of the temperature controller used for the data collection, see: Cosier & Glazer (1986).
Data collection: APEX2 (Bruker, 2009); cell
SAINT (Bruker, 2009); data reduction: SAINT (Bruker, 2009); program(s) used to solve structure: SHELXTL (Sheldrick, 2008); program(s) used to refine structure: SHELXTL (Sheldrick, 2008); molecular graphics: SHELXTL (Sheldrick, 2008); software used to prepare material for publication: SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).C16H13N3OS | F(000) = 1232 |
Mr = 295.35 | Dx = 1.398 Mg m−3 |
Orthorhombic, Pbca | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 4703 reflections |
a = 9.4498 (8) Å | θ = 2.4–31.6° |
b = 17.0223 (16) Å | µ = 0.23 mm−1 |
c = 17.4454 (16) Å | T = 100 K |
V = 2806.2 (4) Å3 | Block, red |
Z = 8 | 0.50 × 0.20 × 0.13 mm |
Bruker APEXII DUO CCD area-detector diffractometer | 4075 independent reflections |
Radiation source: fine-focus sealed tube | 3185 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.040 |
φ and ω scans | θmax = 30.0°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | h = −13→13 |
Tmin = 0.893, Tmax = 0.969 | k = −23→23 |
16727 measured reflections | l = −24→21 |
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)] = 0.041 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.119 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | w = 1/[σ2(Fo2) + (0.0605P)2 + 1.2202P] where P = (Fo2 + 2Fc2)/3 |
4075 reflections | (Δ/σ)max = 0.001 |
194 parameters | Δρmax = 0.44 e Å−3 |
0 restraints | Δρmin = −0.26 e Å−3 |
C16H13N3OS | V = 2806.2 (4) Å3 |
Mr = 295.35 | Z = 8 |
Orthorhombic, Pbca | Mo Kα radiation |
a = 9.4498 (8) Å | µ = 0.23 mm−1 |
b = 17.0223 (16) Å | T = 100 K |
c = 17.4454 (16) Å | 0.50 × 0.20 × 0.13 mm |
Bruker APEXII DUO CCD area-detector diffractometer | 4075 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2009) | 3185 reflections with I > 2σ(I) |
Tmin = 0.893, Tmax = 0.969 | Rint = 0.040 |
16727 measured reflections |
R[F2 > 2σ(F2)] = 0.041 | 0 restraints |
wR(F2) = 0.119 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.03 | Δρmax = 0.44 e Å−3 |
4075 reflections | Δρmin = −0.26 e Å−3 |
194 parameters |
Experimental. The crystal was placed in the cold stream of an Oxford Cyrosystems Cobra open-flow nitrogen cryostat (Cosier & Glazer, 1986) operating at 100.0 (1) K. |
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. |
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 > 2sigma(F2) is used only for calculating R-factors(gt) etc. and is not relevant to the choice of reflections for refinement. R-factors based on F2 are statistically about twice as large as those based on F, and R- factors based on ALL data will be even larger. |
x | y | z | Uiso*/Ueq | ||
S1 | 0.69098 (4) | 0.04490 (2) | 0.49857 (2) | 0.02567 (12) | |
O1 | 0.90053 (12) | −0.12536 (7) | 0.41611 (7) | 0.0283 (2) | |
N1 | 1.05774 (11) | −0.12424 (7) | 0.21967 (7) | 0.0169 (2) | |
N2 | 0.82471 (11) | −0.10176 (7) | 0.21708 (7) | 0.0166 (2) | |
N3 | 0.84628 (12) | −0.01064 (7) | 0.35843 (7) | 0.0180 (2) | |
C1 | 0.75457 (14) | 0.05425 (8) | 0.34596 (8) | 0.0177 (3) | |
C2 | 0.74342 (15) | 0.08809 (8) | 0.27346 (8) | 0.0210 (3) | |
H2A | 0.7935 | 0.0668 | 0.2325 | 0.025* | |
C3 | 0.65796 (16) | 0.15354 (9) | 0.26189 (9) | 0.0251 (3) | |
H3A | 0.6530 | 0.1764 | 0.2135 | 0.030* | |
C4 | 0.58032 (16) | 0.18488 (9) | 0.32169 (10) | 0.0275 (3) | |
H4A | 0.5232 | 0.2286 | 0.3137 | 0.033* | |
C5 | 0.58816 (16) | 0.15078 (9) | 0.39359 (10) | 0.0256 (3) | |
H5A | 0.5346 | 0.1711 | 0.4337 | 0.031* | |
C6 | 0.67593 (15) | 0.08616 (8) | 0.40635 (8) | 0.0206 (3) | |
C7 | 0.70051 (17) | −0.05535 (9) | 0.46596 (9) | 0.0261 (3) | |
H7A | 0.7100 | −0.0900 | 0.5098 | 0.031* | |
H7B | 0.6134 | −0.0688 | 0.4396 | 0.031* | |
C8 | 0.82425 (15) | −0.06773 (8) | 0.41241 (8) | 0.0209 (3) | |
C9 | 0.96991 (14) | −0.02207 (8) | 0.30913 (8) | 0.0191 (3) | |
H9A | 1.0499 | −0.0374 | 0.3406 | 0.023* | |
H9B | 0.9933 | 0.0274 | 0.2847 | 0.023* | |
C10 | 0.94729 (13) | −0.08304 (8) | 0.24863 (8) | 0.0159 (2) | |
C11 | 1.00375 (13) | −0.17492 (8) | 0.16502 (8) | 0.0165 (3) | |
C12 | 1.06703 (15) | −0.23109 (9) | 0.11796 (8) | 0.0213 (3) | |
H12A | 1.1636 | −0.2415 | 0.1201 | 0.026* | |
C13 | 0.97847 (17) | −0.27045 (9) | 0.06787 (9) | 0.0245 (3) | |
H13A | 1.0162 | −0.3086 | 0.0356 | 0.029* | |
C14 | 0.83220 (16) | −0.25414 (9) | 0.06449 (9) | 0.0234 (3) | |
H14A | 0.7765 | −0.2809 | 0.0291 | 0.028* | |
C15 | 0.76917 (15) | −0.19954 (8) | 0.11228 (8) | 0.0198 (3) | |
H15A | 0.6724 | −0.1898 | 0.1105 | 0.024* | |
C16 | 0.85770 (13) | −0.15965 (8) | 0.16350 (8) | 0.0158 (2) | |
H1N1 | 1.143 (2) | −0.1173 (12) | 0.2353 (12) | 0.033 (5)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0341 (2) | 0.02221 (19) | 0.02070 (19) | −0.00054 (14) | 0.00590 (14) | −0.00461 (13) |
O1 | 0.0333 (6) | 0.0235 (5) | 0.0283 (6) | 0.0070 (4) | 0.0003 (5) | 0.0023 (4) |
N1 | 0.0100 (5) | 0.0214 (6) | 0.0192 (5) | −0.0003 (4) | −0.0003 (4) | −0.0010 (4) |
N2 | 0.0117 (5) | 0.0174 (5) | 0.0208 (6) | −0.0010 (4) | 0.0004 (4) | −0.0003 (4) |
N3 | 0.0166 (5) | 0.0180 (5) | 0.0194 (6) | 0.0007 (4) | 0.0020 (4) | −0.0006 (4) |
C1 | 0.0157 (6) | 0.0154 (6) | 0.0221 (6) | −0.0018 (4) | 0.0004 (5) | −0.0017 (5) |
C2 | 0.0220 (6) | 0.0180 (6) | 0.0230 (7) | −0.0014 (5) | 0.0003 (5) | −0.0005 (5) |
C3 | 0.0282 (7) | 0.0192 (7) | 0.0279 (8) | −0.0014 (5) | −0.0046 (6) | 0.0018 (6) |
C4 | 0.0238 (7) | 0.0185 (6) | 0.0402 (9) | 0.0032 (5) | −0.0036 (6) | −0.0013 (6) |
C5 | 0.0220 (7) | 0.0214 (7) | 0.0334 (8) | 0.0014 (5) | 0.0045 (6) | −0.0069 (6) |
C6 | 0.0201 (6) | 0.0187 (6) | 0.0230 (7) | −0.0025 (5) | 0.0021 (5) | −0.0039 (5) |
C7 | 0.0349 (8) | 0.0197 (7) | 0.0236 (7) | −0.0006 (6) | 0.0088 (6) | −0.0004 (6) |
C8 | 0.0247 (7) | 0.0187 (6) | 0.0192 (7) | −0.0005 (5) | −0.0001 (5) | −0.0014 (5) |
C9 | 0.0133 (5) | 0.0209 (6) | 0.0232 (7) | −0.0019 (5) | 0.0004 (5) | −0.0036 (5) |
C10 | 0.0116 (5) | 0.0173 (6) | 0.0188 (6) | −0.0007 (4) | 0.0018 (5) | 0.0013 (5) |
C11 | 0.0138 (5) | 0.0191 (6) | 0.0167 (6) | −0.0002 (4) | 0.0006 (5) | 0.0011 (5) |
C12 | 0.0182 (6) | 0.0245 (7) | 0.0211 (7) | 0.0030 (5) | 0.0035 (5) | −0.0009 (5) |
C13 | 0.0293 (7) | 0.0238 (7) | 0.0204 (7) | 0.0013 (6) | 0.0038 (6) | −0.0042 (5) |
C14 | 0.0256 (7) | 0.0241 (7) | 0.0204 (7) | −0.0036 (5) | −0.0026 (5) | −0.0012 (5) |
C15 | 0.0171 (6) | 0.0214 (6) | 0.0211 (7) | −0.0029 (5) | −0.0027 (5) | 0.0019 (5) |
C16 | 0.0134 (5) | 0.0171 (6) | 0.0168 (6) | −0.0011 (4) | 0.0003 (5) | 0.0030 (5) |
S1—C6 | 1.7611 (16) | C5—C6 | 1.396 (2) |
S1—C7 | 1.8011 (16) | C5—H5A | 0.9300 |
O1—C8 | 1.2191 (18) | C7—C8 | 1.511 (2) |
N1—C10 | 1.3552 (16) | C7—H7A | 0.9700 |
N1—C11 | 1.3831 (17) | C7—H7B | 0.9700 |
N1—H1N1 | 0.86 (2) | C9—C10 | 1.4955 (19) |
N2—C10 | 1.3214 (16) | C9—H9A | 0.9700 |
N2—C16 | 1.3936 (17) | C9—H9B | 0.9700 |
N3—C8 | 1.3692 (19) | C11—C12 | 1.3950 (19) |
N3—C1 | 1.4207 (17) | C11—C16 | 1.4046 (18) |
N3—C9 | 1.4637 (17) | C12—C13 | 1.383 (2) |
C1—C2 | 1.394 (2) | C12—H12A | 0.9300 |
C1—C6 | 1.3990 (19) | C13—C14 | 1.411 (2) |
C2—C3 | 1.391 (2) | C13—H13A | 0.9300 |
C2—H2A | 0.9300 | C14—C15 | 1.383 (2) |
C3—C4 | 1.382 (2) | C14—H14A | 0.9300 |
C3—H3A | 0.9300 | C15—C16 | 1.3998 (19) |
C4—C5 | 1.384 (2) | C15—H15A | 0.9300 |
C4—H4A | 0.9300 | ||
C6—S1—C7 | 95.35 (7) | H7A—C7—H7B | 108.0 |
C10—N1—C11 | 107.20 (11) | O1—C8—N3 | 121.18 (13) |
C10—N1—H1N1 | 122.3 (14) | O1—C8—C7 | 122.47 (14) |
C11—N1—H1N1 | 130.5 (14) | N3—C8—C7 | 116.35 (12) |
C10—N2—C16 | 104.70 (11) | N3—C9—C10 | 113.14 (11) |
C8—N3—C1 | 124.36 (12) | N3—C9—H9A | 109.0 |
C8—N3—C9 | 115.55 (12) | C10—C9—H9A | 109.0 |
C1—N3—C9 | 120.02 (11) | N3—C9—H9B | 109.0 |
C2—C1—C6 | 118.86 (13) | C10—C9—H9B | 109.0 |
C2—C1—N3 | 120.42 (12) | H9A—C9—H9B | 107.8 |
C6—C1—N3 | 120.71 (13) | N2—C10—N1 | 113.27 (12) |
C3—C2—C1 | 120.45 (14) | N2—C10—C9 | 125.91 (12) |
C3—C2—H2A | 119.8 | N1—C10—C9 | 120.81 (11) |
C1—C2—H2A | 119.8 | N1—C11—C12 | 132.45 (12) |
C4—C3—C2 | 120.52 (15) | N1—C11—C16 | 105.08 (11) |
C4—C3—H3A | 119.7 | C12—C11—C16 | 122.47 (13) |
C2—C3—H3A | 119.7 | C13—C12—C11 | 116.39 (13) |
C3—C4—C5 | 119.58 (14) | C13—C12—H12A | 121.8 |
C3—C4—H4A | 120.2 | C11—C12—H12A | 121.8 |
C5—C4—H4A | 120.2 | C12—C13—C14 | 121.59 (13) |
C4—C5—C6 | 120.46 (14) | C12—C13—H13A | 119.2 |
C4—C5—H5A | 119.8 | C14—C13—H13A | 119.2 |
C6—C5—H5A | 119.8 | C15—C14—C13 | 121.92 (14) |
C5—C6—C1 | 120.11 (14) | C15—C14—H14A | 119.0 |
C5—C6—S1 | 120.53 (11) | C13—C14—H14A | 119.0 |
C1—C6—S1 | 119.35 (11) | C14—C15—C16 | 116.96 (13) |
C8—C7—S1 | 111.46 (10) | C14—C15—H15A | 121.5 |
C8—C7—H7A | 109.3 | C16—C15—H15A | 121.5 |
S1—C7—H7A | 109.3 | N2—C16—C15 | 129.61 (12) |
C8—C7—H7B | 109.3 | N2—C16—C11 | 109.75 (11) |
S1—C7—H7B | 109.3 | C15—C16—C11 | 120.64 (13) |
C8—N3—C1—C2 | −150.61 (14) | C8—N3—C9—C10 | 76.17 (15) |
C9—N3—C1—C2 | 25.96 (19) | C1—N3—C9—C10 | −100.69 (14) |
C8—N3—C1—C6 | 30.5 (2) | C16—N2—C10—N1 | 0.06 (15) |
C9—N3—C1—C6 | −152.88 (13) | C16—N2—C10—C9 | 178.82 (13) |
C6—C1—C2—C3 | 1.4 (2) | C11—N1—C10—N2 | −0.62 (16) |
N3—C1—C2—C3 | −177.44 (13) | C11—N1—C10—C9 | −179.45 (12) |
C1—C2—C3—C4 | −1.5 (2) | N3—C9—C10—N2 | 28.7 (2) |
C2—C3—C4—C5 | 0.1 (2) | N3—C9—C10—N1 | −152.62 (12) |
C3—C4—C5—C6 | 1.3 (2) | C10—N1—C11—C12 | −179.20 (15) |
C4—C5—C6—C1 | −1.4 (2) | C10—N1—C11—C16 | 0.88 (14) |
C4—C5—C6—S1 | 177.68 (12) | N1—C11—C12—C13 | −178.56 (14) |
C2—C1—C6—C5 | 0.0 (2) | C16—C11—C12—C13 | 1.3 (2) |
N3—C1—C6—C5 | 178.85 (13) | C11—C12—C13—C14 | 0.3 (2) |
C2—C1—C6—S1 | −179.06 (10) | C12—C13—C14—C15 | −1.7 (2) |
N3—C1—C6—S1 | −0.20 (18) | C13—C14—C15—C16 | 1.3 (2) |
C7—S1—C6—C5 | 142.33 (13) | C10—N2—C16—C15 | −178.42 (14) |
C7—S1—C6—C1 | −38.62 (13) | C10—N2—C16—C11 | 0.52 (15) |
C6—S1—C7—C8 | 58.75 (12) | C14—C15—C16—N2 | 179.23 (13) |
C1—N3—C8—O1 | 173.88 (13) | C14—C15—C16—C11 | 0.4 (2) |
C9—N3—C8—O1 | −2.8 (2) | N1—C11—C16—N2 | −0.88 (15) |
C1—N3—C8—C7 | −5.6 (2) | C12—C11—C16—N2 | 179.20 (12) |
C9—N3—C8—C7 | 177.65 (12) | N1—C11—C16—C15 | 178.18 (12) |
S1—C7—C8—O1 | 137.50 (14) | C12—C11—C16—C15 | −1.8 (2) |
S1—C7—C8—N3 | −42.98 (17) |
Cg1 and Cg2 are the centroids of the C1–C6 and C11–C16 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···N2i | 0.859 (19) | 1.926 (19) | 2.7800 (15) | 173 (2) |
C12—H12A···Cg1ii | 0.93 | 2.97 | 3.6736 (16) | 134 |
C3—H3A···Cg2iii | 0.93 | 2.61 | 3.4750 (17) | 155 |
Symmetry codes: (i) x+1/2, y, −z+1/2; (ii) x+5/2, −y−1/2, −z; (iii) x+1, −y−1/2, z−1/2. |
Experimental details
Crystal data | |
Chemical formula | C16H13N3OS |
Mr | 295.35 |
Crystal system, space group | Orthorhombic, Pbca |
Temperature (K) | 100 |
a, b, c (Å) | 9.4498 (8), 17.0223 (16), 17.4454 (16) |
V (Å3) | 2806.2 (4) |
Z | 8 |
Radiation type | Mo Kα |
µ (mm−1) | 0.23 |
Crystal size (mm) | 0.50 × 0.20 × 0.13 |
Data collection | |
Diffractometer | Bruker APEXII DUO CCD area-detector diffractometer |
Absorption correction | Multi-scan (SADABS; Bruker, 2009) |
Tmin, Tmax | 0.893, 0.969 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 16727, 4075, 3185 |
Rint | 0.040 |
(sin θ/λ)max (Å−1) | 0.703 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.041, 0.119, 1.03 |
No. of reflections | 4075 |
No. of parameters | 194 |
H-atom treatment | H atoms treated by a mixture of independent and constrained refinement |
Δρmax, Δρmin (e Å−3) | 0.44, −0.26 |
Computer programs: APEX2 (Bruker, 2009), SAINT (Bruker, 2009), SHELXTL (Sheldrick, 2008) and PLATON (Spek, 2009).
Cg1 and Cg2 are the centroids of the C1–C6 and C11–C16 rings, respectively. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1N1···N2i | 0.859 (19) | 1.926 (19) | 2.7800 (15) | 173 (2) |
C12—H12A···Cg1ii | 0.93 | 2.97 | 3.6736 (16) | 134 |
C3—H3A···Cg2iii | 0.93 | 2.61 | 3.4750 (17) | 155 |
Symmetry codes: (i) x+1/2, y, −z+1/2; (ii) x+5/2, −y−1/2, −z; (iii) x+1, −y−1/2, z−1/2. |
Footnotes
‡Thomson Reuters ResearcherID: A-3561-2009.
Acknowledgements
FHK and MMR thank Universiti Sains Malaysia for the Research University Golden Goose grant (No. 1001/PFIZIK/811012).
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This is an open-access article distributed under the terms of the Creative Commons Attribution (CC-BY) Licence, which permits unrestricted use, distribution, and reproduction in any medium, provided the original authors and source are cited.
A number of molecules containing the 1H-benzimidazole nucleus exhibit a broad spectrum of biological activity, including anti-inflammatory (Sridhar et al., 2001), antifungal (Guven et al., 2007), antibacterial (Nofal et al., 2002) and anthelmintic (Pedini et al., 1994) properties. With these results in mind, we have paid particular attention to the preparation of derivatives of 1H-benzimidazole and we report here the crystal structure of the title compound, a 1H-benzimidazole derivative containing 2H-1,4-benzothiazin-3(4H)-one.
The bond lengths and angles are within normal ranges. The thiomorpholine ring (C1, C6-C8, N3, S1) adopts a screw boat confirmation with puckering parameters (Cremer & Pople, 1975) being Q = 0.6563 (13) Å; θ = 66.76 (12)° and φ = 334.16 (14)°. The angle between the benzimidazole ring system and the benzene ring fused to the thiazine ring is 67.22 (6)°.
The intermolecular interaction N1—H1N1···N2 links the molecules to form infinite chains along the a-axis. The crystal structure is further stabilized by C—H···π interactions involving the C1-C6 (Cg1) and C11-C16 (Cg2) benzene rings (Table 1).