organic compounds
2-(3,4-Dimethoxyphenyl)-4-(thiophen-2-yl)-2,3-dihydro-1,5-benzothiazepine
aDepartment of Studies in Physics, Manasagangotri, University of Mysore, Mysore 570 006, India, bDepartment of Studies in Chemistry, Manasagangotri, University of Mysore, Mysore 570 006, India, and cPost Graduate Department of Chemistry, Yuvaraja's College, University of Mysore, Mysore 570 006, India
*Correspondence e-mail: lokanath@physics.uni-mysore.ac.in
In the title compound, C21H19NO2S2, the seven-membered thiazepine ring adopts a slightly distorted twist boat conformation. The dihedral angle between the benzene rings is 67.4 (2)°. The mean plane of the thiophene ring is twisted by 59.3 (2) and 87.7 (2)° from the mean planes of the benezene rings. In the crystal, inversion dimers linked by pairs of C—H⋯O hydrogen bonds generate R22(20) loops.
CCDC reference: 978715
Related literature
For the biological activity of benzophenone derivatives, see: Cutignano et al. (2003); Sanjeeva et al. (2008). For a related structure, see: Manjula et al. (2013).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2013); cell SAINT (Bruker, 2013); data reduction: SAINT; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2006); software used to prepare material for publication: Mercury.
Supporting information
CCDC reference: 978715
10.1107/S1600536813034612/hb7177sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813034612/hb7177Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536813034612/hb7177Isup3.cml
A mixture of 2-aminothiophenol (4 mmol) with 3-(3,4-dimethoxyphenyl)-1- (thiophen-2-yl)prop-2-en-1-one (4 mmol) and 3–4 drops of conc. Hydrochloric acid in methanol (10 ml) was heated with stirring at 473 K for 4 h. The reaction was monitored by TLC (hexane/chloroform). After the completion of the reaction, the mixture was extracted in to ether (30 ml), washed successively with cold and dilute hydrochloric acid and water. The solvent was evaporated to dryness, the solid obtained was crystallized from 95° ethyl alcohol solution to get pale yellow needles of the title compound in 90° yield.
All hydrogen atoms were located geometrically with C—H = 0.93–0.97) Å and allowed to ride on their parent atoms with Uiso(H) = 1.2Ueq(aromatic C).
Seven membered ring compounds are receiving significant attention because of the existence of their structural units in some natural products (Cutignano et al., 2003). Heterocycles containing the 1,4-thiazepine ring is one of important moieties in nitrogen and sulfur containing heterocycles and has been widely used as key building block for pharmaceutical agents as well as biologically active compounds. Benzothiazepine and its derivatives show a wide spectrum of pharmacological activities such as antifeedent, coronary vasodilatory, tranquilizer, antidepressant, CNS stimulant, antihypertensive, calcium channel blocker, antiulcer, calcium antagonist and antimicrobial agents (Sanjeeva et al., 2008). The C6—N12 is shorter than an usual C—N single bond [1.294 Å compared to 1.416 Å] and the C10—S9 bond is shorter than an usual C—S single bond [1.760 Å compared to 1.82 Å]. The bond lengths and angles do not show large deviations and are comparable with those reported for a similar structure (Manjula et al., 2013). The atoms C7, C8, C10 and C11 present in the central thiazepine ring forms a basal plane and the S9 atom as the bow, representing the boat conformation of thiazepine ring.
In the title compound, the dihedral angle between the mean planes of the benzene rings is 67.40°. The mean plane of the thiazepine ring is twisted by 36.17° and 77.93° from the mean planes of two benezene rings.
For the biological activity of benzophenone derivatives, see: Cutignano et al. (2003); Sanjeeva et al. (2008). For a related structure, see: Manjula et al. (2013).
Data collection: APEX2 (Bruker, 2013); cell
SAINT (Bruker, 2013); data reduction: SAINT (Bruker, 2013); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: Mercury (Macrae et al., 2006); software used to prepare material for publication: Mercury (Macrae et al., 2006).C21H19NO2S2 | Z = 2 |
Mr = 381.51 | F(000) = 400 |
Triclinic, P1 | Dx = 1.370 Mg m−3 |
Hall symbol: -P 1 | Cu Kα radiation, λ = 1.54178 Å |
a = 8.6188 (11) Å | Cell parameters from 2999 reflections |
b = 9.7463 (15) Å | θ = 4.0–64.8° |
c = 11.9018 (16) Å | µ = 2.73 mm−1 |
α = 100.308 (10)° | T = 296 K |
β = 107.921 (9)° | Needle, light yellow |
γ = 95.163 (11)° | 0.21 × 0.20 × 0.20 mm |
V = 924.6 (2) Å3 |
Bruker X8 Proteum diffractometer | 2999 independent reflections |
Radiation source: Bruker MicroStar microfocus rotating anode | 2093 reflections with I > 2σ(I) |
Helios multilayer optics monochromator | Rint = 0.051 |
Detector resolution: 10.7 pixels mm-1 | θmax = 64.8°, θmin = 4.0° |
φ and ω scans | h = −10→9 |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | k = −11→9 |
Tmin = 0.598, Tmax = 0.611 | l = −7→13 |
7560 measured reflections |
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)] = 0.058 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.180 | H-atom parameters constrained |
S = 1.07 | W = 1/[Σ2(FO2) + (0.0632P)2 + 0.4716P] WHERE P = (FO2 + 2FC2)/3 |
2999 reflections | (Δ/σ)max < 0.001 |
237 parameters | Δρmax = 0.29 e Å−3 |
0 restraints | Δρmin = −0.39 e Å−3 |
C21H19NO2S2 | γ = 95.163 (11)° |
Mr = 381.51 | V = 924.6 (2) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.6188 (11) Å | Cu Kα radiation |
b = 9.7463 (15) Å | µ = 2.73 mm−1 |
c = 11.9018 (16) Å | T = 296 K |
α = 100.308 (10)° | 0.21 × 0.20 × 0.20 mm |
β = 107.921 (9)° |
Bruker X8 Proteum diffractometer | 2999 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | 2093 reflections with I > 2σ(I) |
Tmin = 0.598, Tmax = 0.611 | Rint = 0.051 |
7560 measured reflections |
R[F2 > 2σ(F2)] = 0.058 | 0 restraints |
wR(F2) = 0.180 | H-atom parameters constrained |
S = 1.07 | Δρmax = 0.29 e Å−3 |
2999 reflections | Δρmin = −0.39 e Å−3 |
237 parameters |
Experimental. m.p. 371 K. 1H NMR (CDCl3): δ 2.1 (d, 2H, C3—H), 3.80 (t, 1H, C2—H), 3.82 (s, 6H, -2OCH3), 6.52 (d, 1H, Ar—H), 6.64 (s, 1H, Ar—H), 7.0 (d, 1H, Ar—H), 7.1 (t, 1H, C5—H 5 m ring), 7.2–7.4 (m, 4H, Ar—H), 7.18 (t, 1H, C4—H 5 m ring), 7.46 (d, 1H, C3—H 5 m ring). Anal. Calcd. for C21H19NO2S2: C 66.11, H 5.02, N 3.67°; found C 66.10, H 4.98, N 3.68°. Mass FAB+ (NBA): 382 (M + 1, 100°). |
Geometry. Bond distances, angles etc. have been calculated using the rounded fractional coordinates. All su's are estimated from the variances of the (full) variance-covariance matrix. The cell e.s.d.'s are taken into account in the estimation of distances, angles and torsion angles |
Refinement. Refinement on F2 for ALL reflections except those flagged by the user for potential systematic errors. Weighted R-factors wR and all goodnesses of fit S are based on F2, conventional R-factors R are based on F, with F set to zero for negative F2. The observed criterion of F2 > σ(F2) is used only for calculating -R-factor-obs 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 | 0.27208 (13) | 0.30975 (11) | −0.03322 (9) | 0.0585 (4) | |
S9 | 0.44948 (13) | 0.64057 (13) | 0.38801 (8) | 0.0588 (4) | |
O23 | 0.1945 (3) | 0.6524 (3) | 0.7567 (2) | 0.0571 (10) | |
O25 | −0.0298 (4) | 0.8108 (3) | 0.7090 (2) | 0.0627 (10) | |
N12 | 0.3407 (4) | 0.6027 (3) | 0.1072 (3) | 0.0497 (10) | |
C2 | 0.1374 (6) | 0.1581 (4) | −0.0805 (4) | 0.0608 (14) | |
C3 | 0.0140 (6) | 0.1630 (5) | −0.0311 (4) | 0.0632 (16) | |
C4 | 0.0329 (5) | 0.2921 (4) | 0.0500 (3) | 0.0523 (12) | |
C5 | 0.1673 (5) | 0.3849 (4) | 0.0577 (3) | 0.0466 (11) | |
C6 | 0.2239 (5) | 0.5289 (4) | 0.1278 (3) | 0.0449 (11) | |
C7 | 0.1393 (5) | 0.5875 (4) | 0.2153 (3) | 0.0480 (11) | |
C8 | 0.2257 (5) | 0.5754 (4) | 0.3433 (3) | 0.0449 (11) | |
C10 | 0.4599 (5) | 0.7707 (4) | 0.3043 (4) | 0.0535 (12) | |
C11 | 0.4061 (5) | 0.7396 (4) | 0.1762 (3) | 0.0527 (12) | |
C13 | 0.5351 (5) | 0.9073 (5) | 0.3660 (4) | 0.0701 (17) | |
C14 | 0.5566 (7) | 1.0118 (5) | 0.3038 (6) | 0.083 (2) | |
C15 | 0.5020 (7) | 0.9803 (5) | 0.1812 (6) | 0.088 (2) | |
C16 | 0.4288 (6) | 0.8464 (5) | 0.1171 (4) | 0.0670 (17) | |
C17 | 0.1517 (4) | 0.6436 (4) | 0.4359 (3) | 0.0431 (11) | |
C18 | 0.0340 (5) | 0.7296 (4) | 0.4125 (3) | 0.0515 (13) | |
C19 | −0.0315 (5) | 0.7881 (4) | 0.5006 (3) | 0.0556 (16) | |
C20 | 0.0245 (5) | 0.7594 (4) | 0.6157 (3) | 0.0482 (11) | |
C21 | 0.1444 (5) | 0.6730 (4) | 0.6401 (3) | 0.0444 (11) | |
C22 | 0.2054 (4) | 0.6162 (4) | 0.5510 (3) | 0.0413 (11) | |
C24 | 0.3247 (6) | 0.5738 (5) | 0.7876 (3) | 0.0632 (16) | |
C26 | −0.1737 (6) | 0.8744 (6) | 0.6826 (4) | 0.0759 (19) | |
H2 | 0.14610 | 0.07970 | −0.13440 | 0.0730* | |
H3 | −0.07240 | 0.08940 | −0.04890 | 0.0760* | |
H4 | −0.03800 | 0.31260 | 0.09370 | 0.0630* | |
H7A | 0.02720 | 0.53760 | 0.18850 | 0.0580* | |
H7B | 0.13320 | 0.68610 | 0.21410 | 0.0580* | |
H8 | 0.21500 | 0.47440 | 0.34310 | 0.0540* | |
H13 | 0.57160 | 0.92930 | 0.45010 | 0.0840* | |
H14 | 0.60810 | 1.10260 | 0.34610 | 0.0990* | |
H15 | 0.51440 | 1.05060 | 0.13970 | 0.1060* | |
H16 | 0.39390 | 0.82690 | 0.03300 | 0.0800* | |
H18 | −0.00340 | 0.74950 | 0.33600 | 0.0620* | |
H19 | −0.11190 | 0.84580 | 0.48260 | 0.0660* | |
H22 | 0.28500 | 0.55770 | 0.56850 | 0.0500* | |
H24A | 0.29120 | 0.47970 | 0.73860 | 0.0940* | |
H24B | 0.35240 | 0.57010 | 0.87140 | 0.0940* | |
H24C | 0.41930 | 0.61810 | 0.77380 | 0.0940* | |
H26A | −0.15080 | 0.96270 | 0.66130 | 0.1140* | |
H26B | −0.20870 | 0.89080 | 0.75250 | 0.1140* | |
H26C | −0.25960 | 0.81310 | 0.61620 | 0.1140* |
U11 | U22 | U33 | U12 | U13 | U23 | |
S1 | 0.0629 (7) | 0.0656 (7) | 0.0458 (6) | 0.0136 (5) | 0.0226 (5) | −0.0012 (5) |
S9 | 0.0514 (6) | 0.0857 (8) | 0.0389 (5) | 0.0170 (5) | 0.0149 (4) | 0.0098 (5) |
O23 | 0.0642 (18) | 0.090 (2) | 0.0267 (13) | 0.0294 (15) | 0.0199 (12) | 0.0196 (13) |
O25 | 0.0651 (18) | 0.098 (2) | 0.0329 (14) | 0.0401 (16) | 0.0224 (13) | 0.0092 (14) |
N12 | 0.0572 (19) | 0.0571 (19) | 0.0366 (16) | 0.0108 (15) | 0.0210 (15) | 0.0044 (14) |
C2 | 0.070 (3) | 0.056 (2) | 0.050 (2) | 0.020 (2) | 0.013 (2) | 0.0028 (19) |
C3 | 0.070 (3) | 0.055 (2) | 0.058 (3) | 0.007 (2) | 0.011 (2) | 0.015 (2) |
C4 | 0.058 (2) | 0.062 (2) | 0.040 (2) | 0.0104 (19) | 0.0177 (18) | 0.0156 (18) |
C5 | 0.053 (2) | 0.056 (2) | 0.0287 (17) | 0.0129 (18) | 0.0107 (16) | 0.0070 (16) |
C6 | 0.049 (2) | 0.058 (2) | 0.0291 (17) | 0.0123 (17) | 0.0148 (16) | 0.0078 (16) |
C7 | 0.052 (2) | 0.061 (2) | 0.0312 (18) | 0.0097 (18) | 0.0182 (16) | 0.0020 (16) |
C8 | 0.053 (2) | 0.054 (2) | 0.0299 (18) | 0.0145 (17) | 0.0174 (16) | 0.0049 (16) |
C10 | 0.048 (2) | 0.063 (2) | 0.049 (2) | 0.0130 (19) | 0.0210 (18) | 0.0002 (19) |
C11 | 0.054 (2) | 0.061 (2) | 0.047 (2) | 0.0086 (19) | 0.0264 (19) | 0.0046 (19) |
C13 | 0.055 (3) | 0.074 (3) | 0.067 (3) | 0.007 (2) | 0.019 (2) | −0.017 (2) |
C14 | 0.087 (4) | 0.060 (3) | 0.102 (4) | 0.004 (3) | 0.046 (3) | −0.001 (3) |
C15 | 0.099 (4) | 0.057 (3) | 0.132 (5) | 0.011 (3) | 0.074 (4) | 0.020 (3) |
C16 | 0.082 (3) | 0.066 (3) | 0.072 (3) | 0.014 (2) | 0.048 (3) | 0.022 (2) |
C17 | 0.048 (2) | 0.051 (2) | 0.0304 (18) | 0.0061 (17) | 0.0166 (15) | 0.0035 (15) |
C18 | 0.067 (3) | 0.067 (2) | 0.0273 (17) | 0.026 (2) | 0.0173 (17) | 0.0169 (17) |
C19 | 0.063 (3) | 0.070 (3) | 0.038 (2) | 0.030 (2) | 0.0177 (18) | 0.0111 (18) |
C20 | 0.053 (2) | 0.062 (2) | 0.0316 (19) | 0.0152 (18) | 0.0184 (16) | 0.0042 (17) |
C21 | 0.048 (2) | 0.057 (2) | 0.0303 (18) | 0.0107 (17) | 0.0154 (15) | 0.0094 (16) |
C22 | 0.048 (2) | 0.054 (2) | 0.0247 (17) | 0.0152 (17) | 0.0128 (15) | 0.0107 (15) |
C24 | 0.068 (3) | 0.091 (3) | 0.037 (2) | 0.032 (2) | 0.0165 (19) | 0.022 (2) |
C26 | 0.062 (3) | 0.104 (4) | 0.055 (3) | 0.034 (3) | 0.020 (2) | −0.011 (3) |
S1—C2 | 1.685 (5) | C17—C22 | 1.388 (5) |
S1—C5 | 1.720 (4) | C18—C19 | 1.397 (6) |
S9—C8 | 1.853 (5) | C19—C20 | 1.394 (5) |
S9—C10 | 1.760 (4) | C20—C21 | 1.386 (6) |
O23—C21 | 1.378 (4) | C21—C22 | 1.376 (5) |
O23—C24 | 1.408 (6) | C2—H2 | 0.9300 |
O25—C20 | 1.366 (5) | C3—H3 | 0.9300 |
O25—C26 | 1.411 (6) | C4—H4 | 0.9300 |
N12—C6 | 1.294 (5) | C7—H7A | 0.9700 |
N12—C11 | 1.400 (5) | C7—H7B | 0.9700 |
C2—C3 | 1.365 (7) | C8—H8 | 0.9800 |
C3—C4 | 1.405 (6) | C13—H13 | 0.9300 |
C4—C5 | 1.373 (6) | C14—H14 | 0.9300 |
C5—C6 | 1.453 (5) | C15—H15 | 0.9300 |
C6—C7 | 1.507 (6) | C16—H16 | 0.9300 |
C7—C8 | 1.507 (5) | C18—H18 | 0.9300 |
C8—C17 | 1.520 (5) | C19—H19 | 0.9300 |
C10—C11 | 1.416 (6) | C22—H22 | 0.9300 |
C10—C13 | 1.391 (6) | C24—H24A | 0.9600 |
C11—C16 | 1.388 (6) | C24—H24B | 0.9600 |
C13—C14 | 1.393 (7) | C24—H24C | 0.9600 |
C14—C15 | 1.355 (9) | C26—H26A | 0.9600 |
C15—C16 | 1.372 (7) | C26—H26B | 0.9600 |
C17—C18 | 1.368 (6) | C26—H26C | 0.9600 |
C2—S1—C5 | 91.9 (2) | S1—C2—H2 | 124.00 |
C8—S9—C10 | 104.1 (2) | C3—C2—H2 | 124.00 |
C21—O23—C24 | 116.8 (3) | C2—C3—H3 | 124.00 |
C20—O25—C26 | 118.1 (3) | C4—C3—H3 | 124.00 |
C6—N12—C11 | 120.1 (3) | C3—C4—H4 | 124.00 |
S1—C2—C3 | 112.6 (3) | C5—C4—H4 | 124.00 |
C2—C3—C4 | 112.1 (4) | C6—C7—H7A | 109.00 |
C3—C4—C5 | 112.7 (4) | C6—C7—H7B | 109.00 |
S1—C5—C4 | 110.7 (3) | C8—C7—H7A | 109.00 |
S1—C5—C6 | 120.3 (3) | C8—C7—H7B | 109.00 |
C4—C5—C6 | 129.0 (4) | H7A—C7—H7B | 108.00 |
N12—C6—C5 | 117.6 (4) | S9—C8—H8 | 107.00 |
N12—C6—C7 | 123.3 (3) | C7—C8—H8 | 107.00 |
C5—C6—C7 | 119.1 (4) | C17—C8—H8 | 107.00 |
C6—C7—C8 | 113.3 (3) | C10—C13—H13 | 120.00 |
S9—C8—C7 | 110.2 (3) | C14—C13—H13 | 119.00 |
S9—C8—C17 | 111.6 (2) | C13—C14—H14 | 120.00 |
C7—C8—C17 | 114.9 (3) | C15—C14—H14 | 120.00 |
S9—C10—C11 | 122.5 (3) | C14—C15—H15 | 119.00 |
S9—C10—C13 | 118.8 (3) | C16—C15—H15 | 119.00 |
C11—C10—C13 | 118.5 (4) | C11—C16—H16 | 120.00 |
N12—C11—C10 | 122.2 (3) | C15—C16—H16 | 120.00 |
N12—C11—C16 | 118.7 (3) | C17—C18—H18 | 119.00 |
C10—C11—C16 | 119.0 (4) | C19—C18—H18 | 119.00 |
C10—C13—C14 | 121.1 (4) | C18—C19—H19 | 120.00 |
C13—C14—C15 | 119.5 (5) | C20—C19—H19 | 120.00 |
C14—C15—C16 | 121.2 (5) | C17—C22—H22 | 119.00 |
C11—C16—C15 | 120.8 (4) | C21—C22—H22 | 119.00 |
C8—C17—C18 | 124.0 (3) | O23—C24—H24A | 109.00 |
C8—C17—C22 | 118.2 (3) | O23—C24—H24B | 109.00 |
C18—C17—C22 | 117.8 (3) | O23—C24—H24C | 109.00 |
C17—C18—C19 | 121.7 (3) | H24A—C24—H24B | 109.00 |
C18—C19—C20 | 119.6 (4) | H24A—C24—H24C | 109.00 |
O25—C20—C19 | 124.8 (4) | H24B—C24—H24C | 109.00 |
O25—C20—C21 | 116.2 (3) | O25—C26—H26A | 110.00 |
C19—C20—C21 | 119.0 (4) | O25—C26—H26B | 109.00 |
O23—C21—C20 | 115.1 (3) | O25—C26—H26C | 109.00 |
O23—C21—C22 | 125.0 (4) | H26A—C26—H26B | 109.00 |
C20—C21—C22 | 120.0 (3) | H26A—C26—H26C | 109.00 |
C17—C22—C21 | 122.0 (4) | H26B—C26—H26C | 109.00 |
C5—S1—C2—C3 | 0.9 (4) | S9—C8—C17—C22 | −64.7 (4) |
C2—S1—C5—C4 | 0.3 (3) | C7—C8—C17—C18 | −10.4 (6) |
C2—S1—C5—C6 | −178.9 (3) | C7—C8—C17—C22 | 169.0 (3) |
C10—S9—C8—C7 | 30.2 (3) | S9—C10—C11—N12 | 0.0 (6) |
C10—S9—C8—C17 | −98.7 (3) | S9—C10—C11—C16 | −175.7 (4) |
C8—S9—C10—C11 | −62.9 (4) | C13—C10—C11—N12 | 175.1 (4) |
C8—S9—C10—C13 | 122.1 (4) | C13—C10—C11—C16 | −0.6 (7) |
C24—O23—C21—C20 | −175.5 (4) | S9—C10—C13—C14 | 175.6 (4) |
C24—O23—C21—C22 | 3.9 (6) | C11—C10—C13—C14 | 0.3 (7) |
C26—O25—C20—C19 | 13.0 (6) | N12—C11—C16—C15 | −175.9 (5) |
C26—O25—C20—C21 | −167.2 (4) | C10—C11—C16—C15 | −0.1 (8) |
C11—N12—C6—C5 | −176.7 (3) | C10—C13—C14—C15 | 0.6 (8) |
C11—N12—C6—C7 | 6.6 (6) | C13—C14—C15—C16 | −1.3 (9) |
C6—N12—C11—C10 | 50.3 (6) | C14—C15—C16—C11 | 1.1 (9) |
C6—N12—C11—C16 | −134.0 (5) | C8—C17—C18—C19 | 179.1 (4) |
S1—C2—C3—C4 | −1.8 (5) | C22—C17—C18—C19 | −0.3 (6) |
C2—C3—C4—C5 | 2.1 (5) | C8—C17—C22—C21 | −179.7 (4) |
C3—C4—C5—S1 | −1.4 (4) | C18—C17—C22—C21 | −0.3 (6) |
C3—C4—C5—C6 | 177.7 (4) | C17—C18—C19—C20 | 0.4 (6) |
S1—C5—C6—N12 | 8.7 (5) | C18—C19—C20—O25 | 179.8 (4) |
S1—C5—C6—C7 | −174.4 (3) | C18—C19—C20—C21 | 0.0 (6) |
C4—C5—C6—N12 | −170.3 (4) | O25—C20—C21—O23 | −0.9 (5) |
C4—C5—C6—C7 | 6.5 (6) | O25—C20—C21—C22 | 179.7 (4) |
N12—C6—C7—C8 | −87.7 (5) | C19—C20—C21—O23 | 178.9 (4) |
C5—C6—C7—C8 | 95.7 (4) | C19—C20—C21—C22 | −0.5 (6) |
C6—C7—C8—S9 | 48.4 (4) | O23—C21—C22—C17 | −178.7 (4) |
C6—C7—C8—C17 | 175.5 (3) | C20—C21—C22—C17 | 0.6 (6) |
S9—C8—C17—C18 | 115.9 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
C4—H4···O23i | 0.93 | 2.54 | 3.457 (5) | 169 |
Symmetry code: (i) −x, −y+1, −z+1. |
D—H···A | D—H | H···A | D···A | D—H···A |
C4—H4···O23i | 0.93 | 2.54 | 3.457 (5) | 169 |
Symmetry code: (i) −x, −y+1, −z+1. |
Acknowledgements
The authors thank the IOE and the University of Mysore for providing the single-crystal X-ray diffractometer facility.
References
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Seven membered ring compounds are receiving significant attention because of the existence of their structural units in some natural products (Cutignano et al., 2003). Heterocycles containing the 1,4-thiazepine ring is one of important moieties in nitrogen and sulfur containing heterocycles and has been widely used as key building block for pharmaceutical agents as well as biologically active compounds. Benzothiazepine and its derivatives show a wide spectrum of pharmacological activities such as antifeedent, coronary vasodilatory, tranquilizer, antidepressant, CNS stimulant, antihypertensive, calcium channel blocker, antiulcer, calcium antagonist and antimicrobial agents (Sanjeeva et al., 2008). The C6—N12 is shorter than an usual C—N single bond [1.294 Å compared to 1.416 Å] and the C10—S9 bond is shorter than an usual C—S single bond [1.760 Å compared to 1.82 Å]. The bond lengths and angles do not show large deviations and are comparable with those reported for a similar structure (Manjula et al., 2013). The atoms C7, C8, C10 and C11 present in the central thiazepine ring forms a basal plane and the S9 atom as the bow, representing the boat conformation of thiazepine ring.
In the title compound, the dihedral angle between the mean planes of the benzene rings is 67.40°. The mean plane of the thiazepine ring is twisted by 36.17° and 77.93° from the mean planes of two benezene rings.