organic compounds
H,3H,3′H-dispiro[benzo[b]thiophene-2,6′-pyrrolo[1,2-c]thiazole-5′,3′′-indoline]-7′-carboxylate
of ethyl 2′′,3-dioxo-7′,7a'-dihydro-1′aDepartment of Physics, Queen Mary's College (Autonomous), Chennai 600 004, India, bDepartment of Organic Chemistry, University of Madras, Guindy Campus, Chennai 600 025, India, and cDepartment of Physics, Presidency College (Autonomous), Chennai 600 005, India
*Correspondence e-mail: aspandian59@gmail.com
In the title compound, C23H20N2O4S2, the central pyrrolidine ring adopts an with the spiro C atom, shared with the benzothiophene ring system, as the flap. The thiazole ring has a twisted conformation on the S—C bond, where the C atom is that closest to methine C atom. The mean planes of the benzothiophene and indoline ring systems are inclined to the mean plane of the central pyrrolidine ring by 82.75 (8) and 80.03 (8)°, respectively, and to each other by 61.49 (6)°. In the crystal, molecules are linked via pairs of N—H⋯O hydrogen bonds, forming inversion dimers with an R22(8) ring motif. The dimers are linked via C—H⋯O and C—H⋯N hydrogen bonds, forming a three-dimensional structure. The ethoxycarbonyl group is disordered over two orientations, with an occupancy ratio of 0.717 (12):0.283 (12).
Keywords: crystal structure; dispiro; benzothiophene; thiazole; pyrrolidine; indoline; hydrogen bonds; inversion dimers.
CCDC reference: 1046458
1. Related literature
For the biological activity of spiro-pyrrolidine derivatives, see: Obniska et al. (2003); Peddi et al. (2004); Zapf et al. (2011); Stylianakis et al. (2003); Waldmann (1995); Suzuki et al. (1994); Huryn et al. (1991). For a related structure, see: Narayanan et al. (2013).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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Data collection: APEX2 (Bruker, 2004); cell APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
CCDC reference: 1046458
10.1107/S2056989015002030/su5067sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989015002030/su5067Isup2.hkl
A reaction mixture of (E)-ethyl 2-(3-oxobenzo[b]thiophen-2(3H)-ylidene) acetate (1.0 mmol), isatin (1.1 mmol) and thiazolidine-4-carboxylic acid (1.1 mmol) was refluxed in methanol (20 ml) until completion of the reaction monitored by TLC analysis. After completion of the reaction the solvent was evaporated under reduced pressure. The crude reaction mixture was dissolved in dichloromethane (2 × 50 ml) and washed with water followed by brine solution. The organic layer was separated and dried over sodium sulfate. After filtration the organic solvent was evaporated under reduced pressure. The product was separated by
using hexane and ethyl acetate (9:1) as an to give a colourless solid. The product was dissolved in chloroform (3 ml) and heated for two minutes. The solution was then subjected to crystallization by slow evaporation of the solvent resulting in single crystals suitable for X-ray crystallographic studies.Atoms C1, C2 and O2 are disordered over two positions (C1A/C1B, C2A/C2B & O2/O2A) with a refined occupancy ratio of 0.716 (12) : 0.284 (12). The O-C and C-C distances of the disordered atoms were restrained to be equal. The displacement parameters of the disordered atoms were restrained to be equal for bonded atoms. The NH H atom was located in a difference Fourier map and freely refined. The C-bound H atoms were fixed geometrically and allowed to ride on their parent C atoms: C-H = 0.93-0.97 Å with Uiso(H) = 1.5Ueq(C) for methyl H atoms and = 1.2Ueq(C) for other H atoms.
Data collection: APEX2 (Bruker, 2004); cell
APEX2 and SAINT (Bruker, 2004); data reduction: SAINT and XPREP (Bruker, 2004); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008, 2015); molecular graphics: ORTEP-3 for Windows (Farrugia, 2012); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008, 2015) and PLATON (Spek, 2009).C23H20N2O4S2 | F(000) = 944 |
Mr = 452.53 | Dx = 1.427 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 3706 reflections |
a = 11.8894 (5) Å | θ = 2.3–25.0° |
b = 10.2181 (4) Å | µ = 0.29 mm−1 |
c = 17.5044 (8) Å | T = 293 K |
β = 97.991 (2)° | Block, colourless |
V = 2105.91 (15) Å3 | 0.35 × 0.30 × 0.30 mm |
Z = 4 |
Bruker Kappa APEXII CCD diffractometer | 3706 independent reflections |
Radiation source: fine-focus sealed tube | 3169 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
ω and ϕ scans | θmax = 25.0°, θmin = 2.3° |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | h = −14→14 |
Tmin = 0.906, Tmax = 0.919 | k = −12→11 |
19635 measured reflections | l = −20→20 |
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)] = 0.032 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.088 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.98 | w = 1/[σ2(Fo2) + (0.0443P)2 + 1.0594P] where P = (Fo2 + 2Fc2)/3 |
3705 reflections | (Δ/σ)max < 0.001 |
312 parameters | Δρmax = 0.26 e Å−3 |
65 restraints | Δρmin = −0.27 e Å−3 |
C23H20N2O4S2 | V = 2105.91 (15) Å3 |
Mr = 452.53 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 11.8894 (5) Å | µ = 0.29 mm−1 |
b = 10.2181 (4) Å | T = 293 K |
c = 17.5044 (8) Å | 0.35 × 0.30 × 0.30 mm |
β = 97.991 (2)° |
Bruker Kappa APEXII CCD diffractometer | 3706 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2004) | 3169 reflections with I > 2σ(I) |
Tmin = 0.906, Tmax = 0.919 | Rint = 0.027 |
19635 measured reflections |
R[F2 > 2σ(F2)] = 0.032 | 65 restraints |
wR(F2) = 0.088 | H atoms treated by a mixture of independent and constrained refinement |
S = 0.98 | Δρmax = 0.26 e Å−3 |
3705 reflections | Δρmin = −0.27 e Å−3 |
312 parameters |
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 | Occ. (<1) | |
C3 | 0.22511 (16) | −0.15734 (19) | 0.81332 (11) | 0.0408 (4) | |
C4 | 0.22481 (14) | −0.12481 (18) | 0.72929 (10) | 0.0342 (4) | |
H4 | 0.1500 | −0.1486 | 0.7019 | 0.041* | |
C5 | 0.31386 (14) | −0.19721 (18) | 0.69063 (10) | 0.0354 (4) | |
H5 | 0.3821 | −0.2098 | 0.7283 | 0.042* | |
C6 | 0.26623 (13) | 0.00729 (17) | 0.62479 (9) | 0.0298 (4) | |
C7 | 0.24619 (13) | 0.02012 (17) | 0.71114 (9) | 0.0314 (4) | |
C8 | 0.15041 (14) | 0.11732 (18) | 0.72277 (10) | 0.0343 (4) | |
C9 | 0.19513 (13) | 0.23396 (18) | 0.76473 (10) | 0.0336 (4) | |
C10 | 0.13286 (15) | 0.3444 (2) | 0.77968 (11) | 0.0437 (5) | |
H10 | 0.0549 | 0.3473 | 0.7640 | 0.052* | |
C11 | 0.18760 (17) | 0.4486 (2) | 0.81770 (13) | 0.0501 (5) | |
H11 | 0.1467 | 0.5223 | 0.8285 | 0.060* | |
C12 | 0.30442 (17) | 0.4440 (2) | 0.84011 (12) | 0.0475 (5) | |
H12 | 0.3411 | 0.5158 | 0.8650 | 0.057* | |
C13 | 0.36685 (15) | 0.33556 (19) | 0.82629 (11) | 0.0393 (4) | |
H13 | 0.4450 | 0.3338 | 0.8414 | 0.047* | |
C14 | 0.31142 (13) | 0.22884 (17) | 0.78951 (9) | 0.0319 (4) | |
C15 | 0.14879 (13) | −0.01360 (18) | 0.57169 (9) | 0.0334 (4) | |
C16 | 0.22851 (14) | 0.17108 (17) | 0.52915 (10) | 0.0331 (4) | |
C17 | 0.24522 (16) | 0.27754 (19) | 0.48425 (11) | 0.0415 (4) | |
H17 | 0.1892 | 0.3057 | 0.4453 | 0.050* | |
C18 | 0.34843 (18) | 0.34133 (19) | 0.49905 (12) | 0.0461 (5) | |
H18 | 0.3620 | 0.4140 | 0.4697 | 0.055* | |
C19 | 0.43177 (17) | 0.29921 (19) | 0.55657 (12) | 0.0451 (5) | |
H19 | 0.5004 | 0.3441 | 0.5658 | 0.054* | |
C20 | 0.41404 (15) | 0.19029 (18) | 0.60081 (11) | 0.0381 (4) | |
H20 | 0.4710 | 0.1606 | 0.6386 | 0.046* | |
C21 | 0.31061 (13) | 0.12661 (17) | 0.58786 (10) | 0.0309 (4) | |
C22 | 0.35408 (17) | −0.17203 (19) | 0.55696 (11) | 0.0422 (4) | |
H22A | 0.4206 | −0.1392 | 0.5368 | 0.051* | |
H22B | 0.2879 | −0.1571 | 0.5189 | 0.051* | |
N1 | 0.34078 (11) | −0.10643 (14) | 0.62958 (8) | 0.0313 (3) | |
N2 | 0.13369 (12) | 0.08759 (15) | 0.52250 (9) | 0.0373 (4) | |
O1 | 0.28776 (14) | −0.23233 (15) | 0.84987 (8) | 0.0601 (4) | |
O3 | 0.05293 (10) | 0.09693 (14) | 0.69704 (9) | 0.0510 (4) | |
O4 | 0.08550 (10) | −0.10764 (13) | 0.57322 (7) | 0.0430 (3) | |
S1 | 0.37513 (3) | 0.07922 (4) | 0.77110 (3) | 0.03457 (13) | |
S2 | 0.36970 (5) | −0.34399 (5) | 0.57908 (3) | 0.05123 (16) | |
C23 | 0.27897 (18) | −0.3280 (2) | 0.65305 (13) | 0.0504 (5) | |
H23A | 0.1995 | −0.3274 | 0.6308 | 0.061* | |
H23B | 0.2917 | −0.3989 | 0.6901 | 0.061* | |
C1 | −0.0015 (4) | −0.0975 (10) | 0.9230 (3) | 0.100 (2) | 0.717 (12) |
H1A | −0.0235 | −0.1289 | 0.9704 | 0.149* | 0.717 (12) |
H1B | −0.0522 | −0.1320 | 0.8803 | 0.149* | 0.717 (12) |
H1C | −0.0050 | −0.0036 | 0.9220 | 0.149* | 0.717 (12) |
C2 | 0.1165 (5) | −0.1407 (8) | 0.9171 (3) | 0.0663 (17) | 0.717 (12) |
H2A | 0.1212 | −0.2354 | 0.9163 | 0.080* | 0.717 (12) |
H2B | 0.1689 | −0.1080 | 0.9603 | 0.080* | 0.717 (12) |
O2 | 0.1435 (9) | −0.0828 (9) | 0.8414 (5) | 0.059 (2) | 0.717 (12) |
C1A | 0.0427 (18) | −0.1791 (17) | 0.9270 (6) | 0.085 (5) | 0.283 (12) |
H1A1 | 0.0230 | −0.1767 | 0.9784 | 0.128* | 0.283 (12) |
H1A2 | 0.0661 | −0.2661 | 0.9157 | 0.128* | 0.283 (12) |
H1A3 | −0.0221 | −0.1546 | 0.8908 | 0.128* | 0.283 (12) |
C2A | 0.1380 (12) | −0.0854 (14) | 0.9211 (8) | 0.053 (3) | 0.283 (12) |
H2A1 | 0.1182 | 0.0052 | 0.9290 | 0.063* | 0.283 (12) |
H2A2 | 0.2080 | −0.1085 | 0.9537 | 0.063* | 0.283 (12) |
O2A | 0.1378 (19) | −0.120 (2) | 0.8381 (10) | 0.043 (3) | 0.283 (12) |
H2 | 0.0730 (15) | 0.098 (2) | 0.4891 (11) | 0.051 (6)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C3 | 0.0357 (10) | 0.0462 (11) | 0.0390 (10) | −0.0027 (9) | −0.0008 (8) | 0.0047 (9) |
C4 | 0.0275 (8) | 0.0386 (10) | 0.0346 (9) | −0.0026 (7) | −0.0020 (7) | 0.0035 (8) |
C5 | 0.0308 (9) | 0.0369 (10) | 0.0369 (9) | −0.0002 (7) | −0.0010 (7) | 0.0034 (8) |
C6 | 0.0220 (8) | 0.0339 (9) | 0.0318 (9) | −0.0008 (7) | −0.0020 (6) | 0.0000 (7) |
C7 | 0.0209 (8) | 0.0383 (10) | 0.0330 (9) | −0.0002 (7) | −0.0032 (6) | −0.0002 (7) |
C8 | 0.0235 (8) | 0.0453 (10) | 0.0335 (9) | 0.0022 (7) | 0.0016 (7) | 0.0056 (8) |
C9 | 0.0252 (8) | 0.0411 (10) | 0.0342 (9) | 0.0037 (7) | 0.0031 (7) | 0.0033 (8) |
C10 | 0.0270 (9) | 0.0511 (12) | 0.0526 (12) | 0.0096 (8) | 0.0035 (8) | 0.0030 (9) |
C11 | 0.0440 (11) | 0.0426 (12) | 0.0634 (13) | 0.0125 (9) | 0.0062 (10) | −0.0036 (10) |
C12 | 0.0441 (11) | 0.0392 (11) | 0.0577 (12) | −0.0006 (9) | 0.0015 (9) | −0.0070 (9) |
C13 | 0.0291 (9) | 0.0442 (11) | 0.0432 (10) | 0.0019 (8) | −0.0003 (8) | −0.0012 (9) |
C14 | 0.0261 (8) | 0.0375 (10) | 0.0317 (8) | 0.0034 (7) | 0.0029 (7) | 0.0027 (7) |
C15 | 0.0257 (8) | 0.0401 (10) | 0.0325 (9) | 0.0000 (7) | −0.0026 (7) | 0.0007 (8) |
C16 | 0.0326 (9) | 0.0353 (10) | 0.0314 (9) | 0.0011 (7) | 0.0041 (7) | −0.0025 (7) |
C17 | 0.0473 (11) | 0.0392 (11) | 0.0377 (10) | 0.0032 (8) | 0.0049 (8) | 0.0039 (8) |
C18 | 0.0599 (12) | 0.0340 (10) | 0.0472 (11) | −0.0048 (9) | 0.0168 (10) | 0.0008 (9) |
C19 | 0.0435 (11) | 0.0407 (11) | 0.0533 (12) | −0.0121 (9) | 0.0148 (9) | −0.0078 (9) |
C20 | 0.0298 (9) | 0.0409 (10) | 0.0433 (10) | −0.0028 (8) | 0.0044 (7) | −0.0043 (8) |
C21 | 0.0273 (8) | 0.0317 (9) | 0.0336 (9) | 0.0007 (7) | 0.0041 (7) | −0.0029 (7) |
C22 | 0.0456 (11) | 0.0405 (11) | 0.0394 (10) | 0.0036 (8) | 0.0019 (8) | −0.0043 (8) |
N1 | 0.0280 (7) | 0.0332 (8) | 0.0317 (7) | 0.0019 (6) | 0.0004 (6) | −0.0010 (6) |
N2 | 0.0284 (8) | 0.0437 (9) | 0.0362 (8) | −0.0021 (6) | −0.0078 (6) | 0.0061 (7) |
O1 | 0.0696 (10) | 0.0639 (10) | 0.0447 (8) | 0.0189 (8) | 0.0010 (7) | 0.0148 (7) |
O3 | 0.0220 (6) | 0.0628 (9) | 0.0652 (9) | 0.0014 (6) | −0.0046 (6) | −0.0071 (7) |
O4 | 0.0315 (6) | 0.0463 (8) | 0.0463 (8) | −0.0113 (6) | −0.0115 (5) | 0.0067 (6) |
S1 | 0.0218 (2) | 0.0417 (3) | 0.0377 (2) | 0.00479 (17) | −0.00465 (17) | −0.00587 (19) |
S2 | 0.0606 (3) | 0.0380 (3) | 0.0542 (3) | 0.0045 (2) | 0.0047 (2) | −0.0082 (2) |
C23 | 0.0546 (12) | 0.0383 (11) | 0.0580 (13) | −0.0051 (9) | 0.0065 (10) | 0.0005 (10) |
C1 | 0.090 (3) | 0.137 (6) | 0.082 (3) | −0.018 (4) | 0.047 (3) | −0.029 (4) |
C2 | 0.068 (3) | 0.093 (5) | 0.041 (2) | −0.007 (3) | 0.020 (2) | 0.013 (3) |
O2 | 0.060 (3) | 0.076 (5) | 0.0464 (19) | 0.021 (3) | 0.0200 (16) | 0.014 (2) |
C1A | 0.123 (13) | 0.102 (10) | 0.039 (5) | −0.060 (9) | 0.036 (6) | −0.012 (6) |
C2A | 0.062 (6) | 0.050 (6) | 0.046 (5) | −0.012 (5) | 0.012 (4) | 0.008 (5) |
O2A | 0.036 (4) | 0.060 (8) | 0.033 (4) | 0.015 (5) | 0.006 (3) | 0.017 (4) |
C3—O1 | 1.191 (2) | C16—C21 | 1.392 (2) |
C3—O2A | 1.24 (2) | C16—N2 | 1.406 (2) |
C3—O2 | 1.376 (10) | C17—C18 | 1.382 (3) |
C3—C4 | 1.508 (2) | C17—H17 | 0.9300 |
C4—C5 | 1.525 (2) | C18—C19 | 1.380 (3) |
C4—C7 | 1.543 (2) | C18—H18 | 0.9300 |
C4—H4 | 0.9800 | C19—C20 | 1.389 (3) |
C5—N1 | 1.483 (2) | C19—H19 | 0.9300 |
C5—C23 | 1.522 (3) | C20—C21 | 1.382 (2) |
C5—H5 | 0.9800 | C20—H20 | 0.9300 |
C6—N1 | 1.457 (2) | C22—N1 | 1.465 (2) |
C6—C21 | 1.509 (2) | C22—S2 | 1.803 (2) |
C6—C7 | 1.568 (2) | C22—H22A | 0.9700 |
C6—C15 | 1.581 (2) | C22—H22B | 0.9700 |
C7—C8 | 1.546 (2) | N2—H2 | 0.869 (15) |
C7—S1 | 1.8355 (16) | S2—C23 | 1.804 (2) |
C8—O3 | 1.202 (2) | C23—H23A | 0.9700 |
C8—C9 | 1.461 (3) | C23—H23B | 0.9700 |
C9—C14 | 1.391 (2) | C1—C2 | 1.488 (6) |
C9—C10 | 1.394 (3) | C1—H1A | 0.9600 |
C10—C11 | 1.372 (3) | C1—H1B | 0.9600 |
C10—H10 | 0.9300 | C1—H1C | 0.9600 |
C11—C12 | 1.391 (3) | C2—O2 | 1.526 (9) |
C11—H11 | 0.9300 | C2—H2A | 0.9700 |
C12—C13 | 1.373 (3) | C2—H2B | 0.9700 |
C12—H12 | 0.9300 | C1A—C2A | 1.499 (9) |
C13—C14 | 1.386 (3) | C1A—H1A1 | 0.9600 |
C13—H13 | 0.9300 | C1A—H1A2 | 0.9600 |
C14—S1 | 1.7558 (17) | C1A—H1A3 | 0.9600 |
C15—O4 | 1.223 (2) | C2A—O2A | 1.497 (17) |
C15—N2 | 1.342 (2) | C2A—H2A1 | 0.9700 |
C16—C17 | 1.373 (3) | C2A—H2A2 | 0.9700 |
O1—C3—O2A | 120.0 (9) | C18—C17—H17 | 121.2 |
O1—C3—O2 | 125.7 (4) | C19—C18—C17 | 121.24 (18) |
O2A—C3—O2 | 16.2 (13) | C19—C18—H18 | 119.4 |
O1—C3—C4 | 125.62 (18) | C17—C18—H18 | 119.4 |
O2A—C3—C4 | 112.7 (8) | C18—C19—C20 | 120.51 (17) |
O2—C3—C4 | 108.7 (4) | C18—C19—H19 | 119.7 |
C3—C4—C5 | 114.74 (15) | C20—C19—H19 | 119.7 |
C3—C4—C7 | 115.75 (15) | C21—C20—C19 | 119.12 (17) |
C5—C4—C7 | 103.29 (13) | C21—C20—H20 | 120.4 |
C3—C4—H4 | 107.5 | C19—C20—H20 | 120.4 |
C5—C4—H4 | 107.5 | C20—C21—C16 | 118.96 (17) |
C7—C4—H4 | 107.5 | C20—C21—C6 | 131.79 (16) |
N1—C5—C23 | 108.13 (15) | C16—C21—C6 | 109.21 (14) |
N1—C5—C4 | 104.42 (14) | N1—C22—S2 | 106.25 (13) |
C23—C5—C4 | 116.98 (15) | N1—C22—H22A | 110.5 |
N1—C5—H5 | 109.0 | S2—C22—H22A | 110.5 |
C23—C5—H5 | 109.0 | N1—C22—H22B | 110.5 |
C4—C5—H5 | 109.0 | S2—C22—H22B | 110.5 |
N1—C6—C21 | 115.02 (13) | H22A—C22—H22B | 108.7 |
N1—C6—C7 | 100.60 (12) | C6—N1—C22 | 116.95 (13) |
C21—C6—C7 | 117.02 (14) | C6—N1—C5 | 110.48 (13) |
N1—C6—C15 | 114.01 (13) | C22—N1—C5 | 113.52 (14) |
C21—C6—C15 | 100.96 (13) | C15—N2—C16 | 112.36 (14) |
C7—C6—C15 | 109.75 (12) | C15—N2—H2 | 123.3 (14) |
C4—C7—C8 | 116.36 (14) | C16—N2—H2 | 124.3 (14) |
C4—C7—C6 | 99.77 (13) | C14—S1—C7 | 92.53 (8) |
C8—C7—C6 | 113.21 (13) | C22—S2—C23 | 90.69 (9) |
C4—C7—S1 | 110.27 (11) | C5—C23—S2 | 103.62 (13) |
C8—C7—S1 | 106.58 (12) | C5—C23—H23A | 111.0 |
C6—C7—S1 | 110.61 (11) | S2—C23—H23A | 111.0 |
O3—C8—C9 | 126.48 (17) | C5—C23—H23B | 111.0 |
O3—C8—C7 | 121.94 (17) | S2—C23—H23B | 111.0 |
C9—C8—C7 | 111.54 (13) | H23A—C23—H23B | 109.0 |
C14—C9—C10 | 120.18 (17) | C2—C1—H1A | 109.5 |
C14—C9—C8 | 113.73 (15) | C2—C1—H1B | 109.6 |
C10—C9—C8 | 126.09 (15) | H1A—C1—H1B | 109.5 |
C11—C10—C9 | 119.42 (17) | C2—C1—H1C | 109.3 |
C11—C10—H10 | 120.3 | H1A—C1—H1C | 109.5 |
C9—C10—H10 | 120.3 | H1B—C1—H1C | 109.5 |
C10—C11—C12 | 119.88 (18) | C1—C2—O2 | 105.0 (7) |
C10—C11—H11 | 120.1 | C1—C2—H2A | 110.6 |
C12—C11—H11 | 120.1 | O2—C2—H2A | 110.7 |
C13—C12—C11 | 121.40 (19) | C1—C2—H2B | 110.8 |
C13—C12—H12 | 119.3 | O2—C2—H2B | 110.8 |
C11—C12—H12 | 119.3 | H2A—C2—H2B | 108.8 |
C12—C13—C14 | 118.87 (16) | C3—O2—C2 | 109.9 (7) |
C12—C13—H13 | 120.6 | C2A—C1A—H1A1 | 109.5 |
C14—C13—H13 | 120.6 | C2A—C1A—H1A2 | 109.8 |
C13—C14—C9 | 120.21 (16) | H1A1—C1A—H1A2 | 109.5 |
C13—C14—S1 | 125.52 (13) | C2A—C1A—H1A3 | 109.1 |
C9—C14—S1 | 114.26 (13) | H1A1—C1A—H1A3 | 109.5 |
O4—C15—N2 | 126.28 (15) | H1A2—C1A—H1A3 | 109.5 |
O4—C15—C6 | 126.10 (15) | O2A—C2A—C1A | 90.8 (14) |
N2—C15—C6 | 107.56 (14) | O2A—C2A—H2A1 | 113.6 |
C17—C16—C21 | 122.63 (16) | C1A—C2A—H2A1 | 113.9 |
C17—C16—N2 | 127.72 (16) | O2A—C2A—H2A2 | 113.4 |
C21—C16—N2 | 109.58 (15) | C1A—C2A—H2A2 | 113.1 |
C16—C17—C18 | 117.51 (17) | H2A1—C2A—H2A2 | 110.8 |
C16—C17—H17 | 121.2 | C3—O2A—C2A | 121.6 (16) |
O1—C3—C4—C5 | 0.2 (3) | C7—C6—C15—N2 | 118.46 (16) |
O2A—C3—C4—C5 | −165.0 (11) | C21—C16—C17—C18 | 0.1 (3) |
O2—C3—C4—C5 | 178.2 (5) | N2—C16—C17—C18 | −176.61 (17) |
O1—C3—C4—C7 | −120.0 (2) | C16—C17—C18—C19 | 0.3 (3) |
O2A—C3—C4—C7 | 74.8 (11) | C17—C18—C19—C20 | 0.5 (3) |
O2—C3—C4—C7 | 58.0 (5) | C18—C19—C20—C21 | −1.7 (3) |
C3—C4—C5—N1 | −150.45 (14) | C19—C20—C21—C16 | 2.0 (3) |
C7—C4—C5—N1 | −23.56 (16) | C19—C20—C21—C6 | 179.27 (17) |
C3—C4—C5—C23 | 90.12 (19) | C17—C16—C21—C20 | −1.2 (3) |
C7—C4—C5—C23 | −142.99 (16) | N2—C16—C21—C20 | 175.96 (15) |
C3—C4—C7—C8 | −69.85 (19) | C17—C16—C21—C6 | −179.05 (16) |
C5—C4—C7—C8 | 163.90 (14) | N2—C16—C21—C6 | −1.86 (19) |
C3—C4—C7—C6 | 168.03 (14) | N1—C6—C21—C20 | −49.8 (2) |
C5—C4—C7—C6 | 41.78 (14) | C7—C6—C21—C20 | 68.0 (2) |
C3—C4—C7—S1 | 51.64 (17) | C15—C6—C21—C20 | −173.01 (18) |
C5—C4—C7—S1 | −74.60 (14) | N1—C6—C21—C16 | 127.64 (15) |
N1—C6—C7—C4 | −44.39 (14) | C7—C6—C21—C16 | −114.60 (15) |
C21—C6—C7—C4 | −169.73 (13) | C15—C6—C21—C16 | 4.43 (17) |
C15—C6—C7—C4 | 76.07 (15) | C21—C6—N1—C22 | −69.72 (19) |
N1—C6—C7—C8 | −168.73 (13) | C7—C6—N1—C22 | 163.60 (14) |
C21—C6—C7—C8 | 65.93 (18) | C15—C6—N1—C22 | 46.2 (2) |
C15—C6—C7—C8 | −48.27 (18) | C21—C6—N1—C5 | 158.38 (13) |
N1—C6—C7—S1 | 71.74 (13) | C7—C6—N1—C5 | 31.70 (15) |
C21—C6—C7—S1 | −53.60 (16) | C15—C6—N1—C5 | −85.67 (16) |
C15—C6—C7—S1 | −167.80 (11) | S2—C22—N1—C6 | −145.63 (12) |
C4—C7—C8—O3 | −48.7 (2) | S2—C22—N1—C5 | −15.15 (17) |
C6—C7—C8—O3 | 66.1 (2) | C23—C5—N1—C6 | 119.60 (16) |
S1—C7—C8—O3 | −172.12 (15) | C4—C5—N1—C6 | −5.64 (17) |
C4—C7—C8—C9 | 133.65 (15) | C23—C5—N1—C22 | −14.04 (19) |
C6—C7—C8—C9 | −111.60 (16) | C4—C5—N1—C22 | −139.28 (14) |
S1—C7—C8—C9 | 10.22 (17) | O4—C15—N2—C16 | −172.24 (17) |
O3—C8—C9—C14 | 178.35 (18) | C6—C15—N2—C16 | 5.08 (19) |
C7—C8—C9—C14 | −4.1 (2) | C17—C16—N2—C15 | 174.80 (18) |
O3—C8—C9—C10 | −2.6 (3) | C21—C16—N2—C15 | −2.2 (2) |
C7—C8—C9—C10 | 174.91 (17) | C13—C14—S1—C7 | −171.66 (16) |
C14—C9—C10—C11 | 1.2 (3) | C9—C14—S1—C7 | 9.31 (14) |
C8—C9—C10—C11 | −177.76 (18) | C4—C7—S1—C14 | −137.86 (12) |
C9—C10—C11—C12 | 0.7 (3) | C8—C7—S1—C14 | −10.72 (12) |
C10—C11—C12—C13 | −1.2 (3) | C6—C7—S1—C14 | 112.74 (12) |
C11—C12—C13—C14 | −0.3 (3) | N1—C22—S2—C23 | 31.91 (14) |
C12—C13—C14—C9 | 2.3 (3) | N1—C5—C23—S2 | 36.32 (17) |
C12—C13—C14—S1 | −176.71 (15) | C4—C5—C23—S2 | 153.75 (13) |
C10—C9—C14—C13 | −2.7 (3) | C22—S2—C23—C5 | −39.29 (14) |
C8—C9—C14—C13 | 176.35 (16) | O1—C3—O2—C2 | −19.0 (10) |
C10—C9—C14—S1 | 176.34 (14) | O2A—C3—O2—C2 | 56 (4) |
C8—C9—C14—S1 | −4.56 (19) | C4—C3—O2—C2 | 163.0 (6) |
N1—C6—C15—O4 | 47.7 (2) | C1—C2—O2—C3 | −154.3 (7) |
C21—C6—C15—O4 | 171.64 (17) | O1—C3—O2A—C2A | 42 (2) |
C7—C6—C15—O4 | −64.2 (2) | O2—C3—O2A—C2A | −73 (4) |
N1—C6—C15—N2 | −129.59 (15) | C4—C3—O2A—C2A | −151.8 (15) |
C21—C6—C15—N2 | −5.69 (17) | C1A—C2A—O2A—C3 | −126.0 (17) |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2···O4i | 0.87 (2) | 2.05 (2) | 2.9029 (18) | 169 (2) |
C11—H11···O3ii | 0.93 | 2.47 | 3.215 (2) | 137 |
C13—H13···N1iii | 0.93 | 2.60 | 3.505 (2) | 165 |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x, y+1/2, −z+3/2; (iii) −x+1, y+1/2, −z+3/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N2—H2···O4i | 0.869 (15) | 2.045 (16) | 2.9029 (18) | 169 (2) |
C11—H11···O3ii | 0.93 | 2.47 | 3.215 (2) | 137 |
C13—H13···N1iii | 0.93 | 2.60 | 3.505 (2) | 165 |
Symmetry codes: (i) −x, −y, −z+1; (ii) −x, y+1/2, −z+3/2; (iii) −x+1, y+1/2, −z+3/2. |
Acknowledgements
The authors thank Dr Babu Vargheese, SAIF, IIT, Madras, India, for his help with the data collection.
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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.
Spiro-pyrrolidine derivatives are unique tetracyclic 5-HT(2 A) receptor antagonists (Obniska et al., 2003; Peddi et al., 2004). These derivatives possess anticancer (Zapf et al., 2011) and anti-influenza virus (Stylianakis et al., 2003) activities. Highly functionalized pyrrolidines have gained much interest in the past few years as they constitute the main structural element of many natural and synthetic pharmacologically active compounds (Waldmann, 1995). Optically active pyrrolidines have been used as intermediates, chiral ligands or auxiliaries in controlled asymmetric synthesis (Suzuki et al., 1994; Huryn et al., 1991). In view of these importance and in continuation of our work on the crystal structure analysis of spiro-pyrrolidine derivatives, the crystal structure of the title compound has been carried out and the results are presented here.
The molecular structure of the title compound as illustrated in Fig. 1. The bond lengths and angles are within normal ranges and comparable to those found in a related structure (Narayanan et al., 2013). Terminal atoms C1, C2, O2 in the ethyl carboxylate group are disordered over two positions [C1/C1A, C2/C2A & O2/O2A] with a site-occupancy ratio of 0.716 (12) : 0.284 (12). The sum of the angles at N1 and N2 [340.95° and 359.96°, respectively] of the pyrrolidine and indole rings are in accordance with sp3 and sp2 hybridization.
The central pyrrolidine ring (N1/C4-C7) forms dihedral angles of 82.0 (1)° and 80.9 (1)°, respectively, with pyrrolidine ring (N2/C6/C15-C16/C21) of indole ring system and the benzene ring (C9-C16) of benzothiophene ring system. The central pyrrolidine ring has an envelope conformation with atom C7 as the flap [puckering parameters of q2 = 0.4574 (2)Å , ϕ2 = 293.2 (2)°]. The thiophene ring (S1/C7-C9/C14) adopts twisted conformation on bond S1-C7 [puckering parameters of q2 = 0.1294 (2)Å, ϕ2 = 16.8 (8)°]. The five membered thiozole ring (N1/S2/C5/C22,C23) adopts twisted conformation on C23-S2 [puckering parameters of q2 = 0.4675 (2) Å, ϕ2 = 164.4 (2)°].
In the crystal, molecules are linked via C-H···O, C-H···N, N-H···O intermolecular hydrogen bonds (Table 1 and Fig. 2). The C11-H11···O3 inter-molecular interactions form a dimer with graphset motif R22(12) and N2-H2···O4 hydrogen bonds connect molecules to form inversion dimers, with an R22(8) ring motif (Fig. 2). C13-H13···N1 hydrogen bonds form a linear chain along the a axis. This combination of C-H···O, C-H···N and N-H···O hydrogen bonds gives a three-dimensional structure.