organic compounds
1-[(2-Chloro-3-quinolyl)methyl]indoline-2,3-dione
aOrganic Chemistry Division, School of Science, VIT University, Vellore 632 014, Tamil Nadu, India, bSolid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore 560 012, Karnataka, India, and cDepartment of Chemistry, Quaid-i-Azam University, Islamabad 45320, Pakistan
*Correspondence e-mail: khawar_rauf@hotmail.com
In the title compound, C18H11ClN2O2, the isatin and 2-chloro-3-methylquinoline units are both almost planar, with r.m.s. deviations of 0.0075 and 0.0086 Å, respectively, and the dihedral angle between the mean planes of the two units is 83.13 (7)°. In the crystal, a weak intermolecular C—H⋯ O interaction links the molecules into chains along the c axis.
Related literature
For background to the use of N-substituted indole-2,3-diones as intermediates and synthetic precursors for the preparation of see: Silaicheva et al. (2009). For the biological activity of N-substituted indole-2,3-diones, see: Vine et al. (2007). For reference bond lengths, see: Allen et al. (1987).
Experimental
Crystal data
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Data collection
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Refinement
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Data collection: CrysAlis PRO (Oxford Diffraction, 2009); cell CrysAlis PRO; data reduction: CrysAlis PRO; program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S1600536810013966/pv2276sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S1600536810013966/pv2276Isup2.hkl
2-Chloro-3-chloromethylquinoline (210 mg, 1 mmol), KOtBu (112 mg, 1 mmol) and isatin (147 mg, 1 mmol) in tetrahydrofuran (10 ml) were taken in a round bottemed flask and the mixture was refluxed at 70 W for 3 min. Ethylacetate (30 ml) was poured into the reaction mixture and filtered off. The filtrate was subjected to
packed with silica and ethyl acetate/petroleum ether was used as the eluant (4:1). Crystals of suitable quality were grown by slow evaporation from a solution of the title compound in dichloromethane.Hydrogen atoms were placed in calculated positions at C—H = 0.93 and 0.97 Å, for aryl and methylene type H atoms, respectively, and were included in the
in riding model approximation, with Uiso(H) set to 1.2Ueq(C).N-substituted indole-2,3-diones have been frequently used as intermediates and synthetic precursors for the preparation of a wide variety of
(Silaicheva et al., 2009). In addition, they possess different biological activities such as cytotoxicity, antiviral activity and selective caspase inhibitions, etc. (Vine et al., 2007). We have synthesized a novel isatin derivative and determined its which is presented in this article.In the title molecule, the atoms (C11—C18/N2/O1/O2) of the isatin moiety and 2-chloro-3-methylquinoline group (C1—C8/N1/Cl1) are individually planar with maximum r.m.s. deviations of 0.0075 and 0.0086 Å, respectively, from their mean-planes. The dihedral angle between the two ring systems is 83.13 (7)°. The bond distances and angles in the title compound are as expected (Allen et al., 1987). There is a weak intermolecular interaction C17—H17··· O2 linking the molecules into chains along the c-axis.
For background to the use of N-substituted indole-2,3-diones as intermediates and synthetic precursors for the preparation of
see: Silaicheva et al. (2009). For the biological activity of N-substituted indole-2,3-diones, see: Vine et al. (2007). For reference bond lengths, see: Allen et al. (1987).Data collection: CrysAlis PRO (Oxford Diffraction, 2009); cell
CrysAlis PRO (Oxford Diffraction, 2009); data reduction: CrysAlis PRO (Oxford Diffraction, 2009); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 for Windows (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).C18H11ClN2O2 | F(000) = 664 |
Mr = 322.74 | Dx = 1.463 Mg m−3 |
Monoclinic, P21/c | Mo Kα radiation, λ = 0.71073 Å |
Hall symbol: -P 2ybc | Cell parameters from 2724 reflections |
a = 21.4984 (8) Å | θ = 2.9–25.5° |
b = 5.3061 (2) Å | µ = 0.27 mm−1 |
c = 13.0356 (4) Å | T = 293 K |
β = 99.718 (3)° | Block, orange |
V = 1465.67 (9) Å3 | 0.33 × 0.30 × 0.27 mm |
Z = 4 |
Oxford Diffraction Excalibur diffractometer | 1731 reflections with I > 2σ(I) |
Radiation source: fine-focus sealed tube | Rint = 0.050 |
Graphite monochromator | θmax = 25.5°, θmin = 2.9° |
Detector resolution: 0 pixels mm-1 | h = −26→26 |
ω scans | k = −6→6 |
17920 measured reflections | l = −15→15 |
2724 independent 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)] = 0.037 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.085 | H-atom parameters constrained |
S = 0.90 | w = 1/[σ2(Fo2) + (0.0447P)2] where P = (Fo2 + 2Fc2)/3 |
2724 reflections | (Δ/σ)max < 0.001 |
208 parameters | Δρmax = 0.21 e Å−3 |
0 restraints | Δρmin = −0.23 e Å−3 |
C18H11ClN2O2 | V = 1465.67 (9) Å3 |
Mr = 322.74 | Z = 4 |
Monoclinic, P21/c | Mo Kα radiation |
a = 21.4984 (8) Å | µ = 0.27 mm−1 |
b = 5.3061 (2) Å | T = 293 K |
c = 13.0356 (4) Å | 0.33 × 0.30 × 0.27 mm |
β = 99.718 (3)° |
Oxford Diffraction Excalibur diffractometer | 1731 reflections with I > 2σ(I) |
17920 measured reflections | Rint = 0.050 |
2724 independent reflections |
R[F2 > 2σ(F2)] = 0.037 | 0 restraints |
wR(F2) = 0.085 | H-atom parameters constrained |
S = 0.90 | Δρmax = 0.21 e Å−3 |
2724 reflections | Δρmin = −0.23 e Å−3 |
208 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 > 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 | ||
Cl1 | 0.32510 (3) | 1.40527 (10) | 0.51979 (4) | 0.0614 (2) | |
N1 | 0.38948 (7) | 1.0493 (3) | 0.45048 (11) | 0.0458 (4) | |
C2 | 0.28707 (8) | 1.1294 (3) | 0.34507 (13) | 0.0360 (4) | |
C3 | 0.29797 (8) | 0.9460 (3) | 0.27719 (13) | 0.0379 (4) | |
H3 | 0.2675 | 0.9121 | 0.2192 | 0.046* | |
N2 | 0.18214 (7) | 1.2157 (3) | 0.24049 (11) | 0.0398 (4) | |
C13 | 0.10081 (8) | 1.0002 (3) | 0.13973 (13) | 0.0376 (4) | |
C1 | 0.33623 (9) | 1.1692 (3) | 0.43088 (13) | 0.0406 (5) | |
C14 | 0.13853 (8) | 1.0147 (3) | 0.23746 (14) | 0.0377 (4) | |
C8 | 0.39988 (8) | 0.8632 (3) | 0.38138 (14) | 0.0407 (5) | |
O1 | 0.20473 (6) | 1.5156 (3) | 0.12348 (11) | 0.0579 (4) | |
C4 | 0.36754 (9) | 0.6131 (3) | 0.22547 (15) | 0.0481 (5) | |
H4 | 0.3382 | 0.5751 | 0.1666 | 0.058* | |
O2 | 0.10171 (7) | 1.2586 (3) | −0.01339 (11) | 0.0635 (4) | |
C10 | 0.22789 (9) | 1.2877 (3) | 0.33140 (14) | 0.0463 (5) | |
H10A | 0.2085 | 1.2717 | 0.3931 | 0.056* | |
H10B | 0.2392 | 1.4632 | 0.3249 | 0.056* | |
C9 | 0.35465 (8) | 0.8066 (3) | 0.29322 (13) | 0.0375 (4) | |
C15 | 0.05482 (9) | 0.8170 (4) | 0.11805 (15) | 0.0477 (5) | |
H15 | 0.0300 | 0.8064 | 0.0525 | 0.057* | |
C12 | 0.12083 (8) | 1.1985 (3) | 0.07592 (15) | 0.0423 (5) | |
C7 | 0.45672 (9) | 0.7252 (4) | 0.39988 (16) | 0.0547 (6) | |
H7 | 0.4871 | 0.7616 | 0.4576 | 0.066* | |
C5 | 0.42260 (10) | 0.4820 (4) | 0.24572 (18) | 0.0587 (6) | |
H5 | 0.4306 | 0.3541 | 0.2010 | 0.070* | |
C11 | 0.17522 (9) | 1.3370 (4) | 0.14680 (15) | 0.0418 (5) | |
C6 | 0.46691 (10) | 0.5389 (4) | 0.33319 (19) | 0.0588 (6) | |
H6 | 0.5043 | 0.4475 | 0.3463 | 0.071* | |
C18 | 0.13105 (9) | 0.8492 (4) | 0.31574 (15) | 0.0476 (5) | |
H18 | 0.1561 | 0.8586 | 0.3812 | 0.057* | |
C16 | 0.04657 (9) | 0.6503 (4) | 0.19561 (18) | 0.0542 (6) | |
H16 | 0.0156 | 0.5264 | 0.1829 | 0.065* | |
C17 | 0.08426 (10) | 0.6670 (4) | 0.29230 (18) | 0.0552 (6) | |
H17 | 0.0781 | 0.5524 | 0.3436 | 0.066* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Cl1 | 0.0765 (4) | 0.0609 (4) | 0.0442 (3) | −0.0082 (3) | 0.0028 (3) | −0.0161 (2) |
N1 | 0.0427 (10) | 0.0504 (10) | 0.0406 (9) | −0.0072 (8) | −0.0039 (8) | 0.0046 (8) |
C2 | 0.0363 (10) | 0.0362 (10) | 0.0346 (10) | −0.0046 (9) | 0.0038 (8) | −0.0006 (8) |
C3 | 0.0337 (10) | 0.0422 (11) | 0.0359 (10) | −0.0036 (9) | 0.0000 (8) | 0.0003 (9) |
N2 | 0.0341 (9) | 0.0400 (9) | 0.0425 (10) | 0.0007 (7) | −0.0016 (7) | −0.0043 (7) |
C13 | 0.0320 (10) | 0.0364 (10) | 0.0436 (12) | 0.0019 (9) | 0.0040 (9) | 0.0000 (9) |
C1 | 0.0460 (12) | 0.0415 (11) | 0.0335 (11) | −0.0096 (10) | 0.0042 (9) | −0.0009 (9) |
C14 | 0.0340 (11) | 0.0335 (10) | 0.0461 (12) | 0.0066 (9) | 0.0078 (9) | −0.0017 (9) |
C8 | 0.0319 (11) | 0.0430 (11) | 0.0457 (12) | −0.0052 (9) | 0.0027 (9) | 0.0079 (9) |
O1 | 0.0489 (9) | 0.0526 (9) | 0.0719 (10) | −0.0123 (7) | 0.0092 (7) | 0.0042 (7) |
C4 | 0.0427 (12) | 0.0496 (12) | 0.0520 (13) | 0.0032 (10) | 0.0078 (10) | −0.0040 (10) |
O2 | 0.0690 (10) | 0.0721 (10) | 0.0457 (9) | −0.0133 (8) | −0.0013 (8) | 0.0077 (7) |
C10 | 0.0439 (12) | 0.0458 (11) | 0.0465 (12) | 0.0017 (10) | 0.0004 (10) | −0.0106 (9) |
C9 | 0.0326 (11) | 0.0405 (10) | 0.0388 (11) | −0.0039 (9) | 0.0045 (9) | 0.0038 (9) |
C15 | 0.0394 (12) | 0.0460 (11) | 0.0554 (13) | −0.0005 (10) | 0.0008 (10) | −0.0040 (10) |
C12 | 0.0402 (12) | 0.0448 (11) | 0.0410 (12) | 0.0026 (9) | 0.0045 (10) | −0.0006 (10) |
C7 | 0.0337 (12) | 0.0623 (14) | 0.0632 (14) | −0.0041 (11) | −0.0062 (10) | 0.0136 (12) |
C5 | 0.0492 (14) | 0.0546 (13) | 0.0741 (16) | 0.0050 (11) | 0.0160 (12) | −0.0028 (11) |
C11 | 0.0330 (11) | 0.0405 (11) | 0.0516 (13) | 0.0026 (10) | 0.0069 (9) | 0.0001 (10) |
C6 | 0.0395 (13) | 0.0548 (14) | 0.0824 (17) | 0.0074 (11) | 0.0107 (12) | 0.0099 (12) |
C18 | 0.0476 (13) | 0.0477 (12) | 0.0477 (12) | 0.0142 (11) | 0.0087 (10) | 0.0045 (10) |
C16 | 0.0413 (13) | 0.0421 (12) | 0.0810 (17) | −0.0023 (10) | 0.0155 (12) | −0.0007 (12) |
C17 | 0.0576 (14) | 0.0415 (12) | 0.0726 (16) | 0.0104 (11) | 0.0282 (13) | 0.0122 (11) |
Cl1—C1 | 1.7503 (18) | C4—C9 | 1.412 (2) |
N1—C1 | 1.297 (2) | C4—H4 | 0.9300 |
N1—C8 | 1.380 (2) | O2—C12 | 1.210 (2) |
C2—C3 | 1.362 (2) | C10—H10A | 0.9700 |
C2—C1 | 1.419 (3) | C10—H10B | 0.9700 |
C2—C10 | 1.510 (2) | C15—C16 | 1.377 (3) |
C3—C9 | 1.411 (2) | C15—H15 | 0.9300 |
C3—H3 | 0.9300 | C12—C11 | 1.548 (3) |
N2—C11 | 1.366 (2) | C7—C6 | 1.358 (3) |
N2—C14 | 1.416 (2) | C7—H7 | 0.9300 |
N2—C10 | 1.457 (2) | C5—C6 | 1.390 (3) |
C13—C15 | 1.381 (2) | C5—H5 | 0.9300 |
C13—C14 | 1.392 (2) | C6—H6 | 0.9300 |
C13—C12 | 1.451 (3) | C18—C17 | 1.391 (3) |
C14—C18 | 1.376 (2) | C18—H18 | 0.9300 |
C8—C9 | 1.407 (2) | C16—C17 | 1.381 (3) |
C8—C7 | 1.410 (3) | C16—H16 | 0.9300 |
O1—C11 | 1.208 (2) | C17—H17 | 0.9300 |
C4—C5 | 1.360 (3) | ||
C1—N1—C8 | 117.22 (16) | C8—C9—C3 | 118.02 (17) |
C3—C2—C1 | 115.56 (17) | C8—C9—C4 | 118.98 (17) |
C3—C2—C10 | 123.70 (16) | C3—C9—C4 | 123.00 (17) |
C1—C2—C10 | 120.73 (16) | C16—C15—C13 | 118.58 (18) |
C2—C3—C9 | 121.17 (17) | C16—C15—H15 | 120.7 |
C2—C3—H3 | 119.4 | C13—C15—H15 | 120.7 |
C9—C3—H3 | 119.4 | O2—C12—C13 | 131.09 (18) |
C11—N2—C14 | 110.98 (15) | O2—C12—C11 | 123.28 (17) |
C11—N2—C10 | 124.07 (15) | C13—C12—C11 | 105.62 (16) |
C14—N2—C10 | 124.94 (15) | C6—C7—C8 | 119.8 (2) |
C15—C13—C14 | 120.82 (16) | C6—C7—H7 | 120.1 |
C15—C13—C12 | 131.64 (17) | C8—C7—H7 | 120.1 |
C14—C13—C12 | 107.54 (16) | C4—C5—C6 | 120.1 (2) |
N1—C1—C2 | 126.69 (17) | C4—C5—H5 | 119.9 |
N1—C1—Cl1 | 115.82 (14) | C6—C5—H5 | 119.9 |
C2—C1—Cl1 | 117.49 (15) | O1—C11—N2 | 127.74 (18) |
C18—C14—C13 | 121.36 (17) | O1—C11—C12 | 126.75 (18) |
C18—C14—N2 | 128.29 (17) | N2—C11—C12 | 105.50 (16) |
C13—C14—N2 | 110.35 (15) | C7—C6—C5 | 121.4 (2) |
N1—C8—C9 | 121.33 (17) | C7—C6—H6 | 119.3 |
N1—C8—C7 | 119.42 (18) | C5—C6—H6 | 119.3 |
C9—C8—C7 | 119.24 (18) | C14—C18—C17 | 116.82 (19) |
C5—C4—C9 | 120.46 (19) | C14—C18—H18 | 121.6 |
C5—C4—H4 | 119.8 | C17—C18—H18 | 121.6 |
C9—C4—H4 | 119.8 | C15—C16—C17 | 120.00 (19) |
N2—C10—C2 | 112.95 (14) | C15—C16—H16 | 120.0 |
N2—C10—H10A | 109.0 | C17—C16—H16 | 120.0 |
C2—C10—H10A | 109.0 | C16—C17—C18 | 122.42 (19) |
N2—C10—H10B | 109.0 | C16—C17—H17 | 118.8 |
C2—C10—H10B | 109.0 | C18—C17—H17 | 118.8 |
H10A—C10—H10B | 107.8 | ||
C1—C2—C3—C9 | 0.3 (2) | C2—C3—C9—C4 | 179.27 (16) |
C10—C2—C3—C9 | 179.03 (16) | C5—C4—C9—C8 | 0.6 (3) |
C8—N1—C1—C2 | −0.1 (3) | C5—C4—C9—C3 | −178.91 (17) |
C8—N1—C1—Cl1 | −179.53 (12) | C14—C13—C15—C16 | 0.7 (3) |
C3—C2—C1—N1 | −0.2 (3) | C12—C13—C15—C16 | 179.68 (17) |
C10—C2—C1—N1 | −178.90 (17) | C15—C13—C12—O2 | 1.3 (3) |
C3—C2—C1—Cl1 | 179.28 (12) | C14—C13—C12—O2 | −179.6 (2) |
C10—C2—C1—Cl1 | 0.5 (2) | C15—C13—C12—C11 | −179.36 (18) |
C15—C13—C14—C18 | −0.5 (3) | C14—C13—C12—C11 | −0.28 (18) |
C12—C13—C14—C18 | −179.71 (16) | N1—C8—C7—C6 | 178.92 (17) |
C15—C13—C14—N2 | 179.64 (15) | C9—C8—C7—C6 | −0.5 (3) |
C12—C13—C14—N2 | 0.45 (19) | C9—C4—C5—C6 | −0.4 (3) |
C11—N2—C14—C18 | 179.71 (17) | C14—N2—C11—O1 | 179.81 (17) |
C10—N2—C14—C18 | −1.1 (3) | C10—N2—C11—O1 | 0.6 (3) |
C11—N2—C14—C13 | −0.46 (19) | C14—N2—C11—C12 | 0.25 (18) |
C10—N2—C14—C13 | 178.72 (15) | C10—N2—C11—C12 | −178.93 (15) |
C1—N1—C8—C9 | 0.2 (3) | O2—C12—C11—O1 | −0.2 (3) |
C1—N1—C8—C7 | −179.23 (16) | C13—C12—C11—O1 | −179.55 (17) |
C11—N2—C10—C2 | −98.40 (18) | O2—C12—C11—N2 | 179.41 (17) |
C14—N2—C10—C2 | 82.5 (2) | C13—C12—C11—N2 | 0.02 (18) |
C3—C2—C10—N2 | 2.8 (2) | C8—C7—C6—C5 | 0.7 (3) |
C1—C2—C10—N2 | −178.58 (16) | C4—C5—C6—C7 | −0.2 (3) |
N1—C8—C9—C3 | 0.0 (3) | C13—C14—C18—C17 | 0.2 (3) |
C7—C8—C9—C3 | 179.40 (16) | N2—C14—C18—C17 | 180.00 (16) |
N1—C8—C9—C4 | −179.55 (15) | C13—C15—C16—C17 | −0.6 (3) |
C7—C8—C9—C4 | −0.2 (3) | C15—C16—C17—C18 | 0.3 (3) |
C2—C3—C9—C8 | −0.3 (2) | C14—C18—C17—C16 | −0.1 (3) |
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···N2 | 0.93 | 2.49 | 2.842 (2) | 102 |
C17—H17···O2i | 0.93 | 2.48 | 3.367 (3) | 160 |
Symmetry code: (i) x, −y+3/2, z+1/2. |
Experimental details
Crystal data | |
Chemical formula | C18H11ClN2O2 |
Mr | 322.74 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 293 |
a, b, c (Å) | 21.4984 (8), 5.3061 (2), 13.0356 (4) |
β (°) | 99.718 (3) |
V (Å3) | 1465.67 (9) |
Z | 4 |
Radiation type | Mo Kα |
µ (mm−1) | 0.27 |
Crystal size (mm) | 0.33 × 0.30 × 0.27 |
Data collection | |
Diffractometer | Oxford Diffraction Excalibur |
Absorption correction | – |
No. of measured, independent and observed [I > 2σ(I)] reflections | 17920, 2724, 1731 |
Rint | 0.050 |
(sin θ/λ)max (Å−1) | 0.606 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.037, 0.085, 0.90 |
No. of reflections | 2724 |
No. of parameters | 208 |
H-atom treatment | H-atom parameters constrained |
Δρmax, Δρmin (e Å−3) | 0.21, −0.23 |
Computer programs: CrysAlis PRO (Oxford Diffraction, 2009), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 for Windows (Farrugia, 1997), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
C3—H3···N2 | 0.93 | 2.49 | 2.842 (2) | 102 |
C17—H17···O2i | 0.93 | 2.48 | 3.367 (3) | 160 |
Symmetry code: (i) x, −y+3/2, z+1/2. |
Acknowledgements
We thank the Department of Science and Technology, India, for use of the CCD facility set up under the FIST–DST program at SSCU, IISc. We also thank Professor T. N. Guru Row, IISc, Bangalore, for his help with the data collection. FNK thanks the DST for Fast Track Proposal funding.
References
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N-substituted indole-2,3-diones have been frequently used as intermediates and synthetic precursors for the preparation of a wide variety of heterocyclic compounds (Silaicheva et al., 2009). In addition, they possess different biological activities such as cytotoxicity, antiviral activity and selective caspase inhibitions, etc. (Vine et al., 2007). We have synthesized a novel isatin derivative and determined its crystal structure which is presented in this article.
In the title molecule, the atoms (C11—C18/N2/O1/O2) of the isatin moiety and 2-chloro-3-methylquinoline group (C1—C8/N1/Cl1) are individually planar with maximum r.m.s. deviations of 0.0075 and 0.0086 Å, respectively, from their mean-planes. The dihedral angle between the two ring systems is 83.13 (7)°. The bond distances and angles in the title compound are as expected (Allen et al., 1987). There is a weak intermolecular interaction C17—H17··· O2 linking the molecules into chains along the c-axis.