organic compounds
E)-2-phenylethenyl]quinoline-4-carboxylate
of ethyl 6-bromo-2-[(aDepartment of Chemistry, Kuvempu University, Jnanasahyadri, Shankaraghatta 577 451, India, bInstitution of Excellence, University of Mysore, Manasagangotri, Mysuru 570 006, India, cDepartment of Chemistry, Yuvaraja's College, University of Mysore, Mysuru 570 005, India, dDepartment of Chemistry, Kuvempu University, Jnanasahyadri, Shankaraghatta 577451, India, and eDepartment of Studies in Physics, University of Mysore, Manasagangotri, Mysuru 570 006, India
*Correspondence e-mail: lokanath@physics.uni-mysore.ac.in
In the title compound, C20H16BrNO2, the dihedral angle between the quinolone ring system mean plane (r.m.s. deviation = 0.018 Å) and the phenyl ring bridged by the ethynyl group, is 25.44 (14)°. There is an intramolecular C—H⋯O hydrogen bond forming an S(6) ring motif. In the crystal, molecules are linked via C—H⋯O hydrogen bonds forming chains propagating along the b-axis direction.
Keywords: crystal structure; quinoline; quinoline-4-carboxylate; hydrogen bonding.
CCDC reference: 1041593
1. Related literature
For pharmaceutical and pharmacological activities of quinolines, see: Beagley et al. (2003). The title compound was synthesized in a continuation of our work on new quinoline-based therapeutic agents, see: Pradeep et al. (2014).
2. Experimental
2.1. Crystal data
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2.3. Refinement
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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., 2008); software used to prepare material for publication: SHELXL97.
Supporting information
CCDC reference: 1041593
10.1107/S2056989014028266/su5042sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S2056989014028266/su5042Isup2.hkl
Supporting information file. DOI: 10.1107/S2056989014028266/su5042Isup3.cml
A mixture of 2-aryl-6-chloro/bromo quinoline-4-carboxylic acid (1.0 g) and absolute EtOH (15 ml) was stirred at 273 - 278 K. The concentrated sulfuric acid (2 - 3 ml) was added drop wise into the flask until the powdered 2-aryl-6-chloroquinoline-4-carboxylic acid was completely dissolved. The solution was then refluxed for 15–17 h. The completion of the reaction was monitored by thin layer
[hexane and ethyl acetate (9:1 v/v)]. The reaction mixture was poured into a crushed ice (100 ml), the precipitate was collected by filtration, washed with water and EtOH, dried under vacuum to afford crude product. The crude product was purified by using silica gel (60–120 mesh, petroleum ether: ethyl acetate, 9:1 v/v). Green block-shaped crystals were obtained by slow evaporation of the solvent.1H-NMR(400 MHz, CDCl3): δ = 8.95 (d, J = 2.00 Hz, 1H), 8.17 (s, 1H), 7.99 (d, J = 4.40 Hz, 1H), 7.82 (d, J = 2.40 Hz, 1H), 7.81 (t, J = 2.00 Hz, 1H), 7.75 (s, 1H), 7.65 (d, J = 7.20 Hz, 1H), 7.35–7.35 (m, 4H), 4.54 (q, J = 7.20 Hz, 2H), 1.46–1.49 (m, 3H) p.p.m.. MS (70 eV) m/z (%): 382.0 (M+).
All the H atoms were fixed geometrically (C—H = 0.93–0.96 Å and allowed to ride on their parent atoms with Uiso(H) = 1.5Ueq(C) for methyl H atoms and = 1.2Ueq(C) for other H atoms.
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., 2008); software used to prepare material for publication: SHELXL97 (Sheldrick, 2008).C20H16BrNO2 | F(000) = 1552 |
Mr = 382.24 | Dx = 1.539 Mg m−3 |
Orthorhombic, Pbca | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: -P 2ac 2ab | Cell parameters from 2722 reflections |
a = 14.0819 (7) Å | θ = 5.8–64.5° |
b = 9.7470 (5) Å | µ = 3.49 mm−1 |
c = 24.0399 (12) Å | T = 293 K |
V = 3299.6 (3) Å3 | Block, green |
Z = 8 | 0.30 × 0.27 × 0.25 mm |
Bruker X8 Proteum diffractometer | 2722 independent reflections |
Radiation source: Bruker MicroStar microfocus rotating anode | 2213 reflections with I > 2σ(I) |
Helios multilayer optics monochromator | Rint = 0.071 |
Detector resolution: 18.4 pixels mm-1 | θmax = 64.5°, θmin = 5.8° |
ϕ and ω scans | h = −16→15 |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | k = −11→11 |
Tmin = 0.421, Tmax = 0.476 | l = −28→27 |
12970 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)] = 0.046 | Hydrogen site location: inferred from neighbouring sites |
wR(F2) = 0.134 | H-atom parameters constrained |
S = 1.04 | w = 1/[σ2(Fo2) + (0.0857P)2] where P = (Fo2 + 2Fc2)/3 |
2722 reflections | (Δ/σ)max = 0.001 |
218 parameters | Δρmax = 0.78 e Å−3 |
0 restraints | Δρmin = −0.92 e Å−3 |
C20H16BrNO2 | V = 3299.6 (3) Å3 |
Mr = 382.24 | Z = 8 |
Orthorhombic, Pbca | Cu Kα radiation |
a = 14.0819 (7) Å | µ = 3.49 mm−1 |
b = 9.7470 (5) Å | T = 293 K |
c = 24.0399 (12) Å | 0.30 × 0.27 × 0.25 mm |
Bruker X8 Proteum diffractometer | 2722 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | 2213 reflections with I > 2σ(I) |
Tmin = 0.421, Tmax = 0.476 | Rint = 0.071 |
12970 measured reflections |
R[F2 > 2σ(F2)] = 0.046 | 0 restraints |
wR(F2) = 0.134 | H-atom parameters constrained |
S = 1.04 | Δρmax = 0.78 e Å−3 |
2722 reflections | Δρmin = −0.92 e Å−3 |
218 parameters |
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 | ||
Br11 | 0.40232 (3) | 0.12926 (3) | 0.45926 (2) | 0.0260 (2) | |
O13 | 0.3502 (2) | 0.6096 (2) | 0.39081 (10) | 0.0299 (8) | |
O14 | 0.32650 (17) | 0.8275 (2) | 0.41637 (9) | 0.0225 (7) | |
N1 | 0.3740 (2) | 0.6330 (3) | 0.60400 (12) | 0.0194 (9) | |
C2 | 0.3819 (2) | 0.5243 (3) | 0.56849 (15) | 0.0186 (9) | |
C3 | 0.4009 (2) | 0.3948 (4) | 0.59271 (17) | 0.0235 (11) | |
C4 | 0.4086 (2) | 0.2801 (4) | 0.56073 (17) | 0.0252 (11) | |
C5 | 0.3971 (2) | 0.2916 (3) | 0.50306 (16) | 0.0212 (10) | |
C6 | 0.3799 (2) | 0.4140 (3) | 0.47707 (15) | 0.0186 (10) | |
C7 | 0.3720 (2) | 0.5345 (3) | 0.50974 (14) | 0.0169 (9) | |
C8 | 0.3536 (2) | 0.6688 (3) | 0.48784 (14) | 0.0170 (9) | |
C9 | 0.3445 (2) | 0.7753 (3) | 0.52462 (14) | 0.0194 (10) | |
C10 | 0.3557 (2) | 0.7552 (3) | 0.58248 (14) | 0.0183 (9) | |
C12 | 0.3436 (2) | 0.6941 (3) | 0.42679 (14) | 0.0191 (10) | |
C15 | 0.3129 (3) | 0.8638 (3) | 0.35775 (15) | 0.0256 (11) | |
C16 | 0.4064 (3) | 0.8926 (4) | 0.33011 (17) | 0.0305 (11) | |
C17 | 0.3493 (2) | 0.8754 (3) | 0.61965 (15) | 0.0208 (10) | |
C18 | 0.3704 (3) | 0.8739 (3) | 0.67333 (15) | 0.0208 (11) | |
C19 | 0.3718 (2) | 0.9924 (3) | 0.71107 (14) | 0.0189 (9) | |
C20 | 0.3281 (3) | 1.1179 (3) | 0.69823 (15) | 0.0237 (11) | |
C21 | 0.3389 (3) | 1.2296 (3) | 0.73304 (16) | 0.0251 (10) | |
C22 | 0.3913 (2) | 1.2187 (4) | 0.78153 (15) | 0.0237 (11) | |
C23 | 0.4324 (3) | 1.0941 (4) | 0.79619 (15) | 0.0246 (10) | |
C24 | 0.4218 (3) | 0.9823 (3) | 0.76129 (14) | 0.0216 (10) | |
H3 | 0.40820 | 0.38790 | 0.63110 | 0.0280* | |
H4 | 0.42130 | 0.19540 | 0.57690 | 0.0300* | |
H6 | 0.37340 | 0.41800 | 0.43860 | 0.0220* | |
H9 | 0.33080 | 0.86260 | 0.51130 | 0.0230* | |
H15A | 0.27260 | 0.94430 | 0.35520 | 0.0310* | |
H15B | 0.28130 | 0.78890 | 0.33870 | 0.0310* | |
H16A | 0.43890 | 0.96390 | 0.35000 | 0.0460* | |
H16B | 0.39560 | 0.92140 | 0.29240 | 0.0460* | |
H16C | 0.44440 | 0.81090 | 0.33020 | 0.0460* | |
H17 | 0.32900 | 0.95800 | 0.60430 | 0.0250* | |
H18 | 0.38580 | 0.78920 | 0.68870 | 0.0250* | |
H20 | 0.29170 | 1.12590 | 0.66610 | 0.0280* | |
H21 | 0.31060 | 1.31280 | 0.72380 | 0.0300* | |
H22 | 0.39920 | 1.29490 | 0.80430 | 0.0290* | |
H23 | 0.46650 | 1.08590 | 0.82910 | 0.0300* | |
H24 | 0.44850 | 0.89860 | 0.77140 | 0.0260* |
U11 | U22 | U33 | U12 | U13 | U23 | |
Br11 | 0.0262 (3) | 0.0137 (3) | 0.0382 (3) | 0.0007 (1) | −0.0011 (2) | −0.0051 (1) |
O13 | 0.0497 (17) | 0.0187 (12) | 0.0212 (14) | −0.0009 (11) | 0.0006 (12) | −0.0020 (10) |
O14 | 0.0314 (13) | 0.0173 (11) | 0.0189 (12) | 0.0030 (10) | 0.0002 (10) | 0.0021 (10) |
N1 | 0.0182 (14) | 0.0181 (15) | 0.0218 (16) | −0.0046 (10) | 0.0005 (12) | −0.0002 (11) |
C2 | 0.0163 (15) | 0.0166 (16) | 0.0229 (18) | −0.0042 (13) | 0.0002 (14) | 0.0001 (14) |
C3 | 0.026 (2) | 0.0204 (18) | 0.024 (2) | −0.0024 (13) | −0.0019 (14) | 0.0032 (15) |
C4 | 0.0229 (19) | 0.0166 (18) | 0.036 (2) | −0.0019 (13) | −0.0029 (15) | 0.0059 (16) |
C5 | 0.0158 (17) | 0.0159 (17) | 0.032 (2) | −0.0005 (12) | 0.0000 (13) | −0.0022 (15) |
C6 | 0.0162 (16) | 0.0160 (16) | 0.0236 (18) | −0.0038 (13) | 0.0008 (14) | −0.0003 (14) |
C7 | 0.0136 (15) | 0.0133 (16) | 0.0239 (18) | −0.0019 (13) | 0.0010 (13) | −0.0003 (13) |
C8 | 0.0140 (15) | 0.0157 (15) | 0.0213 (18) | −0.0035 (13) | −0.0005 (13) | −0.0023 (13) |
C9 | 0.0208 (17) | 0.0154 (16) | 0.0220 (18) | −0.0019 (13) | −0.0015 (14) | −0.0006 (13) |
C10 | 0.0157 (16) | 0.0182 (16) | 0.0211 (17) | −0.0029 (13) | −0.0004 (13) | 0.0018 (13) |
C12 | 0.0202 (17) | 0.0158 (15) | 0.0212 (18) | −0.0003 (13) | 0.0009 (13) | −0.0006 (14) |
C15 | 0.032 (2) | 0.0246 (18) | 0.0201 (19) | 0.0066 (14) | −0.0022 (15) | 0.0029 (14) |
C16 | 0.043 (2) | 0.0216 (18) | 0.027 (2) | −0.0002 (15) | 0.0061 (16) | 0.0010 (16) |
C17 | 0.0218 (17) | 0.0154 (16) | 0.0253 (19) | −0.0014 (13) | 0.0009 (14) | −0.0010 (13) |
C18 | 0.0209 (18) | 0.0174 (17) | 0.024 (2) | −0.0010 (13) | 0.0021 (14) | 0.0001 (13) |
C19 | 0.0180 (15) | 0.0179 (15) | 0.0207 (17) | −0.0031 (13) | 0.0030 (14) | −0.0007 (14) |
C20 | 0.0236 (19) | 0.0276 (18) | 0.0200 (19) | 0.0020 (14) | −0.0020 (14) | −0.0011 (14) |
C21 | 0.0296 (19) | 0.0190 (16) | 0.0267 (19) | 0.0063 (14) | 0.0016 (15) | 0.0004 (15) |
C22 | 0.0267 (19) | 0.0232 (17) | 0.0213 (19) | −0.0062 (14) | 0.0043 (14) | −0.0063 (14) |
C23 | 0.0257 (18) | 0.0279 (17) | 0.0203 (18) | −0.0015 (15) | −0.0031 (15) | 0.0007 (15) |
C24 | 0.0264 (18) | 0.0189 (16) | 0.0194 (17) | 0.0016 (14) | 0.0007 (14) | 0.0039 (14) |
Br11—C5 | 1.902 (3) | C19—C24 | 1.401 (5) |
O13—C12 | 1.198 (4) | C20—C21 | 1.382 (5) |
O14—C12 | 1.346 (4) | C21—C22 | 1.384 (5) |
O14—C15 | 1.466 (4) | C22—C23 | 1.391 (5) |
N1—C2 | 1.365 (4) | C23—C24 | 1.383 (5) |
N1—C10 | 1.324 (4) | C3—H3 | 0.9300 |
C2—C3 | 1.416 (5) | C4—H4 | 0.9300 |
C2—C7 | 1.423 (5) | C6—H6 | 0.9300 |
C3—C4 | 1.361 (6) | C9—H9 | 0.9300 |
C4—C5 | 1.400 (6) | C15—H15A | 0.9700 |
C5—C6 | 1.368 (4) | C15—H15B | 0.9700 |
C6—C7 | 1.417 (4) | C16—H16A | 0.9600 |
C7—C8 | 1.435 (4) | C16—H16B | 0.9600 |
C8—C9 | 1.370 (4) | C16—H16C | 0.9600 |
C8—C12 | 1.495 (5) | C17—H17 | 0.9300 |
C9—C10 | 1.414 (5) | C18—H18 | 0.9300 |
C10—C17 | 1.476 (4) | C20—H20 | 0.9300 |
C15—C16 | 1.501 (6) | C21—H21 | 0.9300 |
C17—C18 | 1.324 (5) | C22—H22 | 0.9300 |
C18—C19 | 1.469 (4) | C23—H23 | 0.9300 |
C19—C20 | 1.404 (4) | C24—H24 | 0.9300 |
C12—O14—C15 | 115.8 (2) | C19—C24—C23 | 121.4 (3) |
C2—N1—C10 | 118.0 (3) | C2—C3—H3 | 120.00 |
N1—C2—C3 | 116.8 (3) | C4—C3—H3 | 119.00 |
N1—C2—C7 | 124.0 (3) | C3—C4—H4 | 121.00 |
C3—C2—C7 | 119.3 (3) | C5—C4—H4 | 120.00 |
C2—C3—C4 | 121.0 (4) | C5—C6—H6 | 121.00 |
C3—C4—C5 | 119.0 (3) | C7—C6—H6 | 121.00 |
Br11—C5—C4 | 118.5 (2) | C8—C9—H9 | 119.00 |
Br11—C5—C6 | 118.6 (3) | C10—C9—H9 | 119.00 |
C4—C5—C6 | 122.8 (3) | O14—C15—H15A | 109.00 |
C5—C6—C7 | 118.9 (3) | O14—C15—H15B | 109.00 |
C2—C7—C6 | 119.0 (3) | C16—C15—H15A | 109.00 |
C2—C7—C8 | 116.5 (3) | C16—C15—H15B | 110.00 |
C6—C7—C8 | 124.5 (3) | H15A—C15—H15B | 108.00 |
C7—C8—C9 | 118.1 (3) | C15—C16—H16A | 109.00 |
C7—C8—C12 | 121.9 (3) | C15—C16—H16B | 109.00 |
C9—C8—C12 | 120.0 (3) | C15—C16—H16C | 109.00 |
C8—C9—C10 | 121.3 (3) | H16A—C16—H16B | 110.00 |
N1—C10—C9 | 122.1 (3) | H16A—C16—H16C | 110.00 |
N1—C10—C17 | 119.3 (3) | H16B—C16—H16C | 109.00 |
C9—C10—C17 | 118.6 (3) | C10—C17—H17 | 118.00 |
O13—C12—O14 | 122.9 (3) | C18—C17—H17 | 118.00 |
O13—C12—C8 | 126.0 (3) | C17—C18—H18 | 117.00 |
O14—C12—C8 | 111.0 (3) | C19—C18—H18 | 117.00 |
O14—C15—C16 | 110.9 (3) | C19—C20—H20 | 120.00 |
C10—C17—C18 | 124.6 (3) | C21—C20—H20 | 120.00 |
C17—C18—C19 | 126.6 (3) | C20—C21—H21 | 120.00 |
C18—C19—C20 | 122.9 (3) | C22—C21—H21 | 120.00 |
C18—C19—C24 | 118.9 (3) | C21—C22—H22 | 120.00 |
C20—C19—C24 | 118.1 (3) | C23—C22—H22 | 120.00 |
C19—C20—C21 | 120.4 (3) | C22—C23—H23 | 120.00 |
C20—C21—C22 | 120.6 (3) | C24—C23—H23 | 120.00 |
C21—C22—C23 | 120.2 (3) | C19—C24—H24 | 119.00 |
C22—C23—C24 | 119.3 (3) | C23—C24—H24 | 119.00 |
C15—O14—C12—O13 | 2.1 (4) | C2—C7—C8—C12 | 178.8 (3) |
C15—O14—C12—C8 | −178.5 (3) | C7—C8—C9—C10 | 1.9 (4) |
C12—O14—C15—C16 | −86.7 (3) | C12—C8—C9—C10 | −178.6 (3) |
C2—N1—C10—C17 | −178.4 (3) | C7—C8—C12—O13 | −0.6 (5) |
C2—N1—C10—C9 | −0.1 (4) | C9—C8—C12—O14 | 0.4 (4) |
C10—N1—C2—C3 | −179.6 (3) | C7—C8—C12—O14 | 179.9 (3) |
C10—N1—C2—C7 | 0.2 (4) | C9—C8—C12—O13 | 179.9 (3) |
C7—C2—C3—C4 | −0.8 (4) | C8—C9—C10—N1 | −1.0 (4) |
C3—C2—C7—C6 | 1.0 (4) | C8—C9—C10—C17 | 177.3 (3) |
N1—C2—C7—C6 | −178.8 (3) | N1—C10—C17—C18 | 7.5 (5) |
N1—C2—C7—C8 | 0.7 (4) | C9—C10—C17—C18 | −170.9 (3) |
N1—C2—C3—C4 | 179.0 (3) | C10—C17—C18—C19 | 175.3 (3) |
C3—C2—C7—C8 | −179.5 (3) | C17—C18—C19—C20 | 16.4 (6) |
C2—C3—C4—C5 | −0.2 (4) | C17—C18—C19—C24 | −161.1 (4) |
C3—C4—C5—C6 | 1.1 (4) | C18—C19—C20—C21 | −174.2 (4) |
C3—C4—C5—Br11 | −177.2 (2) | C24—C19—C20—C21 | 3.4 (5) |
Br11—C5—C6—C7 | 177.4 (2) | C18—C19—C24—C23 | 174.4 (4) |
C4—C5—C6—C7 | −0.9 (4) | C20—C19—C24—C23 | −3.3 (5) |
C5—C6—C7—C2 | −0.2 (4) | C19—C20—C21—C22 | −1.3 (6) |
C5—C6—C7—C8 | −179.6 (3) | C20—C21—C22—C23 | −1.1 (6) |
C6—C7—C8—C9 | 177.8 (3) | C21—C22—C23—C24 | 1.2 (6) |
C6—C7—C8—C12 | −1.8 (4) | C22—C23—C24—C19 | 1.0 (6) |
C2—C7—C8—C9 | −1.7 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
C6—H6···O13 | 0.93 | 2.22 | 2.848 (4) | 124 |
C15—H15A···O13i | 0.97 | 2.51 | 3.413 (4) | 154 |
Symmetry code: (i) −x+1/2, y+1/2, z. |
D—H···A | D—H | H···A | D···A | D—H···A |
C6—H6···O13 | 0.93 | 2.22 | 2.848 (4) | 124 |
C15—H15A···O13i | 0.97 | 2.51 | 3.413 (4) | 154 |
Symmetry code: (i) −x+1/2, y+1/2, z. |
Acknowledgements
The authors are grateful to the Institution of Excellence, Vijnana Bhavana, University of Mysore, Mysuru, for providing the single-crystal X-ray diffractometer facility.
References
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Quinolines have been considered as the most prevalent N-hetero aromatic compounds that exhibit a wide spectrum of pharmaceutical and pharmacological activities (Beagley et al., 2003). Some of the quinoline-4-carboxylates were reported to possess potent 5HT3 antagonizing activity and anti-emetic activity. In view of their broad spectrum of medicinal properties and in continuation of our work on new quinoline based therapeutic agents (Pradeep et al., 2014), the title compound was synthesized, and we report herein on its crystal structure.
The molecular structure of the title molecule is shown in Fig. 1. The quinoline ring system (N1/C2-C10) is planar with the maximum deviations from the mean plane being for atoms C8 and C5 viz. 0.018 (2) Å. The dihedral angle between the quinoline ring and the phenyl ring (C19–C24) bridged by the ethynyl group is 25.44 (14)°. The two rings of the quinolyl moiety are fused in an axial fashion and form a dihedral angle of 1.15 (13)°.
In the crystal, molecules are linked via C–H···O hydrogen bonds forming chains propagating along the b axis direction (Table 1 and Fig. 2).