organic compounds
3′-[(1H-Indol-3-yl)carbonyl]-1′-methyl-2-oxo-4′-(thiophen-2-yl)spiro[indoline-3,2′-pyrrolidine]-3′-carbonitrile
aSri Ram Engineering College, Chennai 602 024, India, bOrganic Chemistry Division, CSIR Central Leather Research Institute, Chennai 600 020, India, and cDepartment of Physics, RKM Vivekananda College (Autonomous), Chennai 600 004, India
*Correspondence e-mail: ksethusankar@yahoo.co.in
In the title compound, C26H20N4O2S, the central pyrrolidine ring adopts a twist conformation on the C—C bond involving the spiro C atom. Its mean plane makes dihedral angles of 78.83 (14), 65.91 (15) and 44.49 (18)° with the mean planes of the adjacent oxindole ring system, the indole system and the thiophene ring, respectively. The indole and indoline units are essentially planar, with maximum deviations of 0.019 (3) and 0.090 (3) Å, respectively. In the oxindole fused-ring system, the pyrrole ring adopts an with the spiro C atom as the flap. In the crystal, pairs of N—H⋯O hydrogen bonds link the molecules, forming inversion dimers with an R22(8) ring motif. The dimers are linked by further N—H⋯O hydrogen bonds, forming a two-dimensional network lying parallel to (100).
CCDC reference: 962054
Related literature
For background to indole derivatives and their biological activity, see: Srivastava et al. (2011). For puckering parameters, see: Cremer & Pople (1975). For bond-length data, see: Allen et al. (1987). For graph-set notation, see: Bernstein et al. (1995). For a related structure, see: Inglebert et al. (2013).
Experimental
Crystal data
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Data collection: APEX2 (Bruker, 2008); cell SAINT (Bruker, 2008); 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., 2008); software used to prepare material for publication: SHELXL97 and PLATON (Spek, 2009).
Supporting information
CCDC reference: 962054
10.1107/S1600536813025890/su2642sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813025890/su2642Isup2.hkl
A mixture of isatin (1 mmol), sarcosine (1.2 mmol) and 2-(1H-indole- 3-carbonyl)-3-(thiophen-2-yl)acrylonitrile (1 mmol) were refluxed in ethanol (30 ml). After completion of the reaction, as evidenced by TLC analysis, the reaction mixture was poured into ice-water. The resulting solid was filtered off and purified by
using ethyl acetate: petroleum ether (6:4) as an to afford pure product. Slow evaporation of the solvents yielded block-like colourless crystals of the title compound.The H atoms were localized from the difference electron density maps. The N bound H atoms were freely refined. The C bound H atoms were treated as riding atoms: C-H = 0.93, 0.97 and 0.96 Å for CH, CH2 and CH3 H atoms, respectively, with Uiso(H) = 1.5Ueq(C-methyl) and = 1.2Ueq(C) for other H atoms. The rotation angles for methyl groups were optimized by least squares.
Data collection: APEX2 (Bruker, 2008); cell
SAINT (Bruker, 2008); data reduction: SAINT (Bruker, 2008); 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) and PLATON (Spek, 2009).C26H20N4O2S | F(000) = 944 |
Mr = 452.52 | Dx = 1.346 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 5279 reflections |
a = 11.6215 (6) Å | θ = 2.2–27.9° |
b = 17.1050 (11) Å | µ = 0.18 mm−1 |
c = 12.3381 (8) Å | T = 293 K |
β = 114.431 (2)° | Block, colourless |
V = 2233.0 (2) Å3 | 0.35 × 0.30 × 0.25 mm |
Z = 4 |
Bruker APEXII2 CCD difractometer diffractometer | 5279 independent reflections |
Radiation source: fine-focus sealed tube | 3636 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.027 |
ω and ϕ scan | θmax = 27.9°, θmin = 2.2° |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | h = −15→8 |
Tmin = 0.941, Tmax = 0.957 | k = −21→22 |
16319 measured reflections | l = −14→16 |
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)] = 0.073 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.252 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | w = 1/[σ2(Fo2) + (0.1409P)2 + 1.6573P] where P = (Fo2 + 2Fc2)/3 |
5279 reflections | (Δ/σ)max = 0.003 |
306 parameters | Δρmax = 1.15 e Å−3 |
5 restraints | Δρmin = −0.98 e Å−3 |
C26H20N4O2S | V = 2233.0 (2) Å3 |
Mr = 452.52 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 11.6215 (6) Å | µ = 0.18 mm−1 |
b = 17.1050 (11) Å | T = 293 K |
c = 12.3381 (8) Å | 0.35 × 0.30 × 0.25 mm |
β = 114.431 (2)° |
Bruker APEXII2 CCD difractometer diffractometer | 5279 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2008) | 3636 reflections with I > 2σ(I) |
Tmin = 0.941, Tmax = 0.957 | Rint = 0.027 |
16319 measured reflections |
R[F2 > 2σ(F2)] = 0.073 | 5 restraints |
wR(F2) = 0.252 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.07 | Δρmax = 1.15 e Å−3 |
5279 reflections | Δρmin = −0.98 e Å−3 |
306 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'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 > σ(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 | ||
C5 | 0.9175 (3) | 0.04509 (16) | 0.1198 (3) | 0.0313 (6) | |
H5 | 0.8526 | 0.0371 | 0.0390 | 0.038* | |
C6 | 0.9536 (3) | −0.03507 (18) | 0.1780 (3) | 0.0403 (7) | |
H6A | 0.9204 | −0.0760 | 0.1188 | 0.048* | |
H6B | 1.0448 | −0.0403 | 0.2170 | 0.048* | |
C7 | 0.8686 (3) | −0.12000 (19) | 0.2877 (4) | 0.0502 (8) | |
H7A | 0.9413 | −0.1529 | 0.3064 | 0.075* | |
H7B | 0.7999 | −0.1397 | 0.2180 | 0.075* | |
H7C | 0.8446 | −0.1197 | 0.3534 | 0.075* | |
C8 | 0.7970 (2) | 0.01482 (16) | 0.2360 (2) | 0.0289 (6) | |
C9 | 0.8532 (2) | 0.08688 (16) | 0.1927 (2) | 0.0277 (6) | |
C10 | 0.7470 (2) | 0.14477 (16) | 0.1152 (2) | 0.0303 (6) | |
C11 | 0.6903 (3) | 0.19866 (17) | 0.1672 (2) | 0.0323 (6) | |
C12 | 0.5730 (2) | 0.24011 (16) | 0.1035 (2) | 0.0311 (6) | |
C13 | 0.4806 (3) | 0.24014 (19) | −0.0133 (3) | 0.0394 (7) | |
H13 | 0.4882 | 0.2079 | −0.0706 | 0.047* | |
C14 | 0.3773 (3) | 0.2892 (2) | −0.0420 (3) | 0.0474 (8) | |
H14 | 0.3153 | 0.2895 | −0.1196 | 0.057* | |
C15 | 0.3641 (3) | 0.3378 (2) | 0.0420 (3) | 0.0479 (8) | |
H15 | 0.2946 | 0.3710 | 0.0192 | 0.058* | |
C16 | 0.4511 (3) | 0.33779 (19) | 0.1576 (3) | 0.0446 (8) | |
H16 | 0.4413 | 0.3694 | 0.2145 | 0.054* | |
C17 | 0.5550 (3) | 0.28865 (18) | 0.1871 (3) | 0.0361 (6) | |
C18 | 0.7336 (3) | 0.22322 (19) | 0.2844 (3) | 0.0419 (7) | |
H18 | 0.8071 | 0.2055 | 0.3463 | 0.050* | |
C19 | 0.7534 (2) | 0.03331 (17) | 0.3323 (2) | 0.0313 (6) | |
C20 | 0.8205 (3) | 0.0492 (2) | 0.4520 (3) | 0.0405 (7) | |
H20 | 0.9083 | 0.0468 | 0.4870 | 0.049* | |
C21 | 0.7536 (4) | 0.0689 (2) | 0.5186 (3) | 0.0520 (9) | |
H21 | 0.7974 | 0.0807 | 0.5989 | 0.062* | |
C22 | 0.6227 (3) | 0.0714 (2) | 0.4675 (3) | 0.0519 (9) | |
H22 | 0.5799 | 0.0856 | 0.5136 | 0.062* | |
C23 | 0.5554 (3) | 0.0530 (2) | 0.3496 (3) | 0.0461 (8) | |
H23 | 0.4676 | 0.0533 | 0.3156 | 0.055* | |
C24 | 0.6223 (3) | 0.03431 (18) | 0.2832 (3) | 0.0344 (6) | |
C25 | 0.6696 (2) | −0.00651 (17) | 0.1305 (2) | 0.0320 (6) | |
C26 | 0.9511 (3) | 0.12412 (17) | 0.2976 (3) | 0.0338 (6) | |
N1 | 0.8989 (2) | −0.04069 (14) | 0.2652 (2) | 0.0314 (5) | |
N2 | 1.0305 (3) | 0.1513 (2) | 0.3775 (3) | 0.0536 (8) | |
N3 | 0.5757 (2) | 0.01076 (17) | 0.1639 (2) | 0.0384 (6) | |
N4 | 0.6549 (3) | 0.27593 (17) | 0.2955 (2) | 0.0432 (6) | |
O1 | 0.7082 (2) | 0.13787 (13) | 0.00656 (18) | 0.0420 (5) | |
O2 | 0.65774 (19) | −0.03273 (14) | 0.03448 (19) | 0.0431 (6) | |
C3 | 1.1633 (3) | 0.07184 (19) | 0.1643 (3) | 0.0387 (7) | |
H3 | 1.2042 | 0.0288 | 0.2100 | 0.046* | |
C1 | 1.1410 (4) | 0.1943 (2) | 0.0621 (4) | 0.0541 (9) | |
H1 | 1.1683 | 0.2385 | 0.0356 | 0.065* | |
C2 | 1.2182 (3) | 0.1393 (2) | 0.1252 (3) | 0.0540 (9) | |
H2 | 1.3045 | 0.1423 | 0.1450 | 0.065* | |
C4 | 1.0225 (3) | 0.09175 (19) | 0.1099 (3) | 0.0369 (6) | |
S1 | 0.98893 (10) | 0.17802 (6) | 0.03333 (12) | 0.0667 (4) | |
H3A | 0.4965 (19) | 0.008 (4) | 0.130 (5) | 0.110 (19)* | |
H4A | 0.669 (4) | 0.303 (2) | 0.357 (3) | 0.066 (13)* |
U11 | U22 | U33 | U12 | U13 | U23 | |
C5 | 0.0313 (13) | 0.0332 (14) | 0.0297 (14) | 0.0053 (11) | 0.0129 (11) | −0.0025 (12) |
C6 | 0.0417 (15) | 0.0360 (16) | 0.0468 (18) | 0.0096 (12) | 0.0220 (14) | 0.0045 (14) |
C7 | 0.0495 (18) | 0.0358 (17) | 0.066 (2) | 0.0044 (14) | 0.0248 (17) | 0.0119 (16) |
C8 | 0.0236 (11) | 0.0356 (14) | 0.0229 (12) | 0.0021 (10) | 0.0048 (10) | 0.0001 (11) |
C9 | 0.0257 (11) | 0.0327 (13) | 0.0229 (12) | 0.0042 (10) | 0.0084 (10) | 0.0002 (11) |
C10 | 0.0318 (12) | 0.0323 (14) | 0.0248 (13) | 0.0061 (11) | 0.0095 (11) | 0.0021 (11) |
C11 | 0.0337 (13) | 0.0346 (14) | 0.0265 (13) | 0.0070 (11) | 0.0103 (11) | 0.0001 (11) |
C12 | 0.0318 (13) | 0.0314 (14) | 0.0314 (14) | 0.0035 (11) | 0.0142 (11) | 0.0020 (11) |
C13 | 0.0350 (14) | 0.0453 (17) | 0.0357 (16) | 0.0043 (12) | 0.0123 (13) | 0.0011 (14) |
C14 | 0.0303 (14) | 0.055 (2) | 0.0478 (19) | 0.0043 (13) | 0.0066 (13) | 0.0085 (16) |
C15 | 0.0341 (15) | 0.0502 (19) | 0.062 (2) | 0.0124 (13) | 0.0223 (15) | 0.0099 (17) |
C16 | 0.0448 (16) | 0.0409 (17) | 0.056 (2) | 0.0098 (14) | 0.0284 (16) | 0.0002 (15) |
C17 | 0.0386 (14) | 0.0352 (15) | 0.0368 (16) | 0.0033 (12) | 0.0180 (13) | −0.0011 (13) |
C18 | 0.0439 (16) | 0.0426 (17) | 0.0344 (16) | 0.0111 (13) | 0.0114 (13) | −0.0040 (13) |
C19 | 0.0306 (13) | 0.0366 (15) | 0.0249 (13) | 0.0020 (11) | 0.0096 (11) | 0.0030 (11) |
C20 | 0.0363 (14) | 0.0528 (19) | 0.0269 (14) | 0.0078 (13) | 0.0076 (12) | 0.0031 (13) |
C21 | 0.058 (2) | 0.070 (2) | 0.0266 (15) | 0.0113 (18) | 0.0167 (15) | 0.0025 (16) |
C22 | 0.056 (2) | 0.068 (2) | 0.0418 (19) | 0.0141 (17) | 0.0301 (17) | 0.0036 (17) |
C23 | 0.0346 (15) | 0.060 (2) | 0.0468 (19) | 0.0058 (14) | 0.0197 (14) | 0.0023 (16) |
C24 | 0.0307 (13) | 0.0400 (15) | 0.0305 (14) | 0.0023 (11) | 0.0106 (11) | 0.0029 (12) |
C25 | 0.0271 (12) | 0.0350 (14) | 0.0280 (14) | 0.0000 (11) | 0.0056 (11) | −0.0010 (12) |
C26 | 0.0300 (13) | 0.0369 (15) | 0.0329 (15) | 0.0036 (11) | 0.0114 (12) | −0.0023 (12) |
N1 | 0.0288 (11) | 0.0308 (12) | 0.0310 (12) | 0.0057 (9) | 0.0088 (10) | 0.0044 (10) |
N2 | 0.0381 (14) | 0.065 (2) | 0.0456 (16) | −0.0050 (13) | 0.0052 (13) | −0.0178 (15) |
N3 | 0.0242 (11) | 0.0548 (16) | 0.0309 (13) | 0.0000 (11) | 0.0061 (10) | −0.0052 (12) |
N4 | 0.0483 (15) | 0.0466 (15) | 0.0318 (14) | 0.0116 (12) | 0.0135 (12) | −0.0089 (12) |
O1 | 0.0500 (12) | 0.0498 (13) | 0.0247 (10) | 0.0188 (10) | 0.0139 (9) | 0.0043 (9) |
O2 | 0.0329 (10) | 0.0571 (14) | 0.0322 (11) | 0.0007 (9) | 0.0064 (9) | −0.0134 (10) |
C3 | 0.0327 (11) | 0.0462 (16) | 0.0462 (17) | −0.0091 (12) | 0.0255 (12) | −0.0036 (14) |
C1 | 0.057 (2) | 0.0451 (19) | 0.069 (2) | −0.0063 (16) | 0.0351 (19) | −0.0027 (18) |
C2 | 0.0441 (18) | 0.057 (2) | 0.066 (2) | −0.0071 (15) | 0.0274 (17) | 0.0100 (18) |
C4 | 0.0348 (11) | 0.0456 (14) | 0.0338 (15) | 0.0016 (12) | 0.0177 (11) | −0.0060 (10) |
S1 | 0.0605 (6) | 0.0559 (6) | 0.0906 (9) | 0.0067 (4) | 0.0380 (6) | 0.0152 (5) |
C5—C4 | 1.505 (4) | C16—C17 | 1.390 (4) |
C5—C6 | 1.524 (4) | C16—H16 | 0.9300 |
C5—C9 | 1.560 (4) | C17—N4 | 1.379 (4) |
C5—H5 | 0.9800 | C18—N4 | 1.331 (4) |
C6—N1 | 1.462 (4) | C18—H18 | 0.9300 |
C6—H6A | 0.9700 | C19—C20 | 1.382 (4) |
C6—H6B | 0.9700 | C19—C24 | 1.388 (4) |
C7—N1 | 1.457 (4) | C20—C21 | 1.385 (5) |
C7—H7A | 0.9600 | C20—H20 | 0.9300 |
C7—H7B | 0.9600 | C21—C22 | 1.386 (5) |
C7—H7C | 0.9600 | C21—H21 | 0.9300 |
C8—N1 | 1.442 (3) | C22—C23 | 1.372 (5) |
C8—C19 | 1.506 (4) | C22—H22 | 0.9300 |
C8—C25 | 1.557 (3) | C23—C24 | 1.379 (4) |
C8—C9 | 1.587 (4) | C23—H23 | 0.9300 |
C9—C26 | 1.469 (4) | C24—N3 | 1.401 (4) |
C9—C10 | 1.562 (4) | C25—O2 | 1.220 (3) |
C10—O1 | 1.231 (3) | C25—N3 | 1.349 (4) |
C10—C11 | 1.430 (4) | C26—N2 | 1.135 (4) |
C11—C18 | 1.385 (4) | N3—H3A | 0.84 (2) |
C11—C12 | 1.446 (4) | N4—H4A | 0.844 (19) |
C12—C13 | 1.396 (4) | C3—C2 | 1.492 (4) |
C12—C17 | 1.405 (4) | C3—C4 | 1.528 (4) |
C13—C14 | 1.385 (4) | C3—H3 | 0.9300 |
C13—H13 | 0.9300 | C1—C2 | 1.310 (5) |
C14—C15 | 1.386 (5) | C1—S1 | 1.676 (4) |
C14—H14 | 0.9300 | C1—H1 | 0.9300 |
C15—C16 | 1.365 (5) | C2—H2 | 0.9300 |
C15—H15 | 0.9300 | C4—S1 | 1.708 (3) |
C4—C5—C6 | 116.2 (2) | N4—C17—C16 | 129.9 (3) |
C4—C5—C9 | 113.7 (2) | N4—C17—C12 | 107.3 (2) |
C6—C5—C9 | 104.2 (2) | C16—C17—C12 | 122.8 (3) |
C4—C5—H5 | 107.5 | N4—C18—C11 | 110.1 (3) |
C6—C5—H5 | 107.5 | N4—C18—H18 | 124.9 |
C9—C5—H5 | 107.5 | C11—C18—H18 | 124.9 |
N1—C6—C5 | 106.7 (2) | C20—C19—C24 | 119.8 (3) |
N1—C6—H6A | 110.4 | C20—C19—C8 | 131.2 (3) |
C5—C6—H6A | 110.4 | C24—C19—C8 | 109.0 (2) |
N1—C6—H6B | 110.4 | C19—C20—C21 | 118.3 (3) |
C5—C6—H6B | 110.4 | C19—C20—H20 | 120.8 |
H6A—C6—H6B | 108.6 | C21—C20—H20 | 120.8 |
N1—C7—H7A | 109.5 | C20—C21—C22 | 121.2 (3) |
N1—C7—H7B | 109.5 | C20—C21—H21 | 119.4 |
H7A—C7—H7B | 109.5 | C22—C21—H21 | 119.4 |
N1—C7—H7C | 109.5 | C23—C22—C21 | 120.8 (3) |
H7A—C7—H7C | 109.5 | C23—C22—H22 | 119.6 |
H7B—C7—H7C | 109.5 | C21—C22—H22 | 119.6 |
N1—C8—C19 | 116.8 (2) | C22—C23—C24 | 118.0 (3) |
N1—C8—C25 | 116.9 (2) | C22—C23—H23 | 121.0 |
C19—C8—C25 | 101.2 (2) | C24—C23—H23 | 121.0 |
N1—C8—C9 | 100.7 (2) | C23—C24—C19 | 122.0 (3) |
C19—C8—C9 | 115.0 (2) | C23—C24—N3 | 128.6 (3) |
C25—C8—C9 | 106.4 (2) | C19—C24—N3 | 109.4 (2) |
C26—C9—C5 | 109.0 (2) | O2—C25—N3 | 126.6 (3) |
C26—C9—C10 | 113.1 (2) | O2—C25—C8 | 125.8 (2) |
C5—C9—C10 | 112.5 (2) | N3—C25—C8 | 107.6 (2) |
C26—C9—C8 | 108.5 (2) | N2—C26—C9 | 177.1 (3) |
C5—C9—C8 | 101.5 (2) | C8—N1—C7 | 115.0 (2) |
C10—C9—C8 | 111.6 (2) | C8—N1—C6 | 109.6 (2) |
O1—C10—C11 | 121.4 (2) | C7—N1—C6 | 114.5 (3) |
O1—C10—C9 | 116.5 (2) | C25—N3—C24 | 112.0 (2) |
C11—C10—C9 | 121.9 (2) | C25—N3—H3A | 134 (4) |
C18—C11—C10 | 128.8 (3) | C24—N3—H3A | 114 (4) |
C18—C11—C12 | 105.8 (2) | C18—N4—C17 | 110.3 (3) |
C10—C11—C12 | 125.3 (2) | C18—N4—H4A | 125 (3) |
C13—C12—C17 | 118.2 (3) | C17—N4—H4A | 124 (3) |
C13—C12—C11 | 135.3 (3) | C2—C3—C4 | 102.1 (3) |
C17—C12—C11 | 106.5 (2) | C2—C3—H3 | 129.0 |
C14—C13—C12 | 118.7 (3) | C4—C3—H3 | 129.0 |
C14—C13—H13 | 120.7 | C2—C1—S1 | 114.2 (3) |
C12—C13—H13 | 120.7 | C2—C1—H1 | 122.9 |
C13—C14—C15 | 121.6 (3) | S1—C1—H1 | 122.9 |
C13—C14—H14 | 119.2 | C1—C2—C3 | 117.9 (3) |
C15—C14—H14 | 119.2 | C1—C2—H2 | 121.1 |
C16—C15—C14 | 121.2 (3) | C3—C2—H2 | 121.1 |
C16—C15—H15 | 119.4 | C5—C4—C3 | 127.1 (3) |
C14—C15—H15 | 119.4 | C5—C4—S1 | 119.7 (2) |
C15—C16—C17 | 117.5 (3) | C3—C4—S1 | 113.2 (2) |
C15—C16—H16 | 121.3 | C1—S1—C4 | 92.66 (17) |
C17—C16—H16 | 121.3 | ||
C4—C5—C6—N1 | 132.7 (3) | N1—C8—C19—C24 | −136.3 (3) |
C9—C5—C6—N1 | 6.8 (3) | C25—C8—C19—C24 | −8.2 (3) |
C4—C5—C9—C26 | −41.6 (3) | C9—C8—C19—C24 | 106.0 (3) |
C6—C5—C9—C26 | 85.8 (3) | C24—C19—C20—C21 | −2.6 (5) |
C4—C5—C9—C10 | 84.7 (3) | C8—C19—C20—C21 | 176.3 (3) |
C6—C5—C9—C10 | −147.9 (2) | C19—C20—C21—C22 | 1.1 (6) |
C4—C5—C9—C8 | −155.9 (2) | C20—C21—C22—C23 | 1.1 (6) |
C6—C5—C9—C8 | −28.5 (3) | C21—C22—C23—C24 | −1.8 (6) |
N1—C8—C9—C26 | −74.4 (3) | C22—C23—C24—C19 | 0.3 (5) |
C19—C8—C9—C26 | 52.0 (3) | C22—C23—C24—N3 | 177.2 (3) |
C25—C8—C9—C26 | 163.2 (2) | C20—C19—C24—C23 | 1.9 (5) |
N1—C8—C9—C5 | 40.3 (2) | C8—C19—C24—C23 | −177.1 (3) |
C19—C8—C9—C5 | 166.8 (2) | C20—C19—C24—N3 | −175.5 (3) |
C25—C8—C9—C5 | −82.1 (2) | C8—C19—C24—N3 | 5.4 (3) |
N1—C8—C9—C10 | 160.4 (2) | N1—C8—C25—O2 | −44.9 (4) |
C19—C8—C9—C10 | −73.2 (3) | C19—C8—C25—O2 | −172.9 (3) |
C25—C8—C9—C10 | 38.0 (3) | C9—C8—C25—O2 | 66.6 (4) |
C26—C9—C10—O1 | 139.7 (3) | N1—C8—C25—N3 | 136.3 (3) |
C5—C9—C10—O1 | 15.6 (4) | C19—C8—C25—N3 | 8.3 (3) |
C8—C9—C10—O1 | −97.7 (3) | C9—C8—C25—N3 | −112.1 (3) |
C26—C9—C10—C11 | −45.4 (4) | C19—C8—N1—C7 | 65.8 (3) |
C5—C9—C10—C11 | −169.4 (3) | C25—C8—N1—C7 | −54.3 (3) |
C8—C9—C10—C11 | 77.2 (3) | C9—C8—N1—C7 | −169.0 (2) |
O1—C10—C11—C18 | −168.2 (3) | C19—C8—N1—C6 | −163.6 (2) |
C9—C10—C11—C18 | 17.1 (5) | C25—C8—N1—C6 | 76.3 (3) |
O1—C10—C11—C12 | 10.7 (5) | C9—C8—N1—C6 | −38.4 (3) |
C9—C10—C11—C12 | −164.0 (3) | C5—C6—N1—C8 | 20.8 (3) |
C18—C11—C12—C13 | −176.8 (3) | C5—C6—N1—C7 | 151.7 (3) |
C10—C11—C12—C13 | 4.1 (5) | O2—C25—N3—C24 | 175.5 (3) |
C18—C11—C12—C17 | 1.3 (3) | C8—C25—N3—C24 | −5.7 (3) |
C10—C11—C12—C17 | −177.8 (3) | C23—C24—N3—C25 | −176.9 (3) |
C17—C12—C13—C14 | 1.5 (4) | C19—C24—N3—C25 | 0.3 (4) |
C11—C12—C13—C14 | 179.5 (3) | C11—C18—N4—C17 | 0.5 (4) |
C12—C13—C14—C15 | 0.0 (5) | C16—C17—N4—C18 | 179.4 (3) |
C13—C14—C15—C16 | −1.7 (5) | C12—C17—N4—C18 | 0.3 (4) |
C14—C15—C16—C17 | 1.6 (5) | S1—C1—C2—C3 | −1.0 (5) |
C15—C16—C17—N4 | −178.9 (3) | C4—C3—C2—C1 | 1.1 (4) |
C15—C16—C17—C12 | 0.1 (5) | C6—C5—C4—C3 | −7.7 (4) |
C13—C12—C17—N4 | 177.5 (3) | C9—C5—C4—C3 | 113.2 (3) |
C11—C12—C17—N4 | −1.0 (3) | C6—C5—C4—S1 | 173.7 (2) |
C13—C12—C17—C16 | −1.6 (5) | C9—C5—C4—S1 | −65.4 (3) |
C11—C12—C17—C16 | 179.8 (3) | C2—C3—C4—C5 | −179.4 (3) |
C10—C11—C18—N4 | 177.9 (3) | C2—C3—C4—S1 | −0.7 (3) |
C12—C11—C18—N4 | −1.1 (4) | C2—C1—S1—C4 | 0.5 (3) |
N1—C8—C19—C20 | 44.8 (4) | C5—C4—S1—C1 | 179.0 (3) |
C25—C8—C19—C20 | 172.9 (3) | C3—C4—S1—C1 | 0.2 (3) |
C9—C8—C19—C20 | −72.9 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···O2i | 0.84 (4) | 2.12 (5) | 2.828 (3) | 142 (5) |
N4—H4A···O1ii | 0.85 (3) | 1.99 (3) | 2.829 (3) | 177 (3) |
Symmetry codes: (i) −x+1, −y, −z; (ii) x, −y+1/2, z+1/2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N3—H3A···O2i | 0.84 (4) | 2.12 (5) | 2.828 (3) | 142 (5) |
N4—H4A···O1ii | 0.85 (3) | 1.99 (3) | 2.829 (3) | 177 (3) |
Symmetry codes: (i) −x+1, −y, −z; (ii) x, −y+1/2, z+1/2. |
Acknowledgements
The authors are gratefully to Dr Babu Varghese, SAIF, IIT, Chennai, India, for the data collection.
References
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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.
The name indole is portmanteau of the words indigo and oleum, since indole was first isolated by treatment of the indigo dye with oleum. The indole compound is aromatic and solid at room temperature, and it has many applications in the fragrance and pharmaceutical industries. Several natural alkaloids having indole as their basic ring and have been found to be therapeutically active. The biological activities of indole derivatives include antimicrobial, antibiotic, analgesic, anticonvulsant, antimalarial, anticancer, antiulcer and antileishmanial (Srivastava et al., 2011).
In the title compound, fig. 1, the central pyrrolidine ring adopts a twisted conformation on bond C8-C9 with puckering parameters (Cremer and Pople, 1975) of q(2) = 0.407 (3)Å and ϕ(2) = 133.5 (4)°. Atoms C8 and C9 deviate from the mean plane of the other atoms by 0.253 (3)Å and -0.232 (3)Å, respectively. The dihedral angle between the mean plane of the indole and the oxindole unit is 34.22 (11)°. The angles between the mean planes of the pyrrolidine ring and the oxindole and indole units are 78.83 (14)° and 65.91 (15)°, respectively.
The thiophene ring is perpendicular to the indole unit with a dihedral angle of 89.02 (15)°. Due to steric forces caused by the bulky substituents on the pyrrolidine moiety, the N—C and C—C bond lengths are slightly longer than the normal values. The sum of the angle around atom N1 (339.1 (7)°) is in accordance with sp3 hybridization. The indole and oxindole units are planar with maximum deviations of 0.019 (3)Å and -0.090 (3)Å for the atoms C11 and C8 from the mean planes. The thiophene ring is also essentially planar with a maximum deviation of -0.006 (4)Å for C2 atom.
The cyano bond distance C26≡N2 agrees well with the reported value of 1.138 (7) Å (Allen et al., 1987). The small tilts between the planes of the five- and six-membered rings in the indole and oxindole units are 3.87 (16)° and 1.56 (18)°, respectively. Both the indole and oxindole moieties are individually quite planar and the dihedral angle between them is 34.22 (11)°. The title compound exhibits structural similarities with the previously reported related structure (Inglebert et al., 2013).
Atom O1 deviates by 1.4756 (22) Å and 0.3082 (24) Å from the mean plane of the pyrrolidine ring and indole unit, respectively. Atom O2 attached to C25 is coplanar with the indoline ring system as indicated by the torsion angle O2–C25–N3–C24 = 175.5 (3)°.
In the crystal, molecules are linked by pairs of N—H···O hydrogen bonds, forming inversion dimers with an R22(8) ring motifs (Bernstein et al., 1995). The dimers are linked by N—H···O hydrogen bonds forming a two-dimensional network lying parallel to (100) [Table 1 and Fig. 2].