organic compounds
2-(5-Methoxy-2-methyl-1H-indol-3-yl)-N′-[(1E,2E)-3-phenylprop-2-en-1-ylidene]acetohydrazide
aDepartment of Physics, Faculty of Sciences, Erciyes University, 38039 Kayseri, Turkey, bDepartment of Chemistry, Tulane University, New Orleans, LA 70118, USA, cChemistry and Environmental Division, Manchester Metropolitan University, Manchester M1 5GD, England, dChemistry Department, Faculty of Science, Minia University, 61519 El-Minia, Egypt, eKirkuk University, College of Science, Department of Chemistry, Kirkuk, Iraq, fDepartment of Organic Chemistry, Faculty of Science, Institute of Biotechnology, Granada University, Granada E-18071, Spain, and gDepartment of Chemistry, Sohag University, 82524 Sohag, Egypt
*Correspondence e-mail: shaabankamel@yahoo.com
The title compound, C21H21N3O2, adopts a J-shaped conformation which appears to be at least partially directed by a weak intramolecular C—H⋯N hydrogen bond. In the crystal, molecules are linked by N—H⋯O hydrogen bonds into R22(8) and R22(14) cyclic dimers, which form a chain running parallel to the b axis.
Related literature
For general background to side-effect toxicity of non-steroidal anti-inflammatory drugs (NSAIDs), see: Agrawal et al. (2010); Champion et al. (1997); Allan & Fletcher (1990). For reduction of GI toxicity attributed to NSAIDs, see: Halen et al. (2009); Schoen & Vender (1989); Mitchell & Warner (1999). For hydrogen-bond motifs, see: Etter et al. (1990).
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: ORTEP-3 for Windows (Farrugia, 2012) and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON.
Supporting information
10.1107/S1600536813023805/qm2100sup1.cif
contains datablocks global, I. DOI:Structure factors: contains datablock I. DOI: 10.1107/S1600536813023805/qm2100Isup2.hkl
Supporting information file. DOI: 10.1107/S1600536813023805/qm2100Isup3.cml
A mixture of 233 mg (1 mmol) 2-(5-methoxy-2-methyl-1H-indole-3-yl)acetohydrazide and 132 mg (1 mmol) of (2E)-3-phenylprop-2-enal in 50 ml of ethanol containing a few drops of glacial acetic acid was refluxed for 6 hrs. The mixture was cooled to room temperature and the excess solvent was evaporated under vacuum. The resulting solid was collected, washed with ethanol and recrystalized from dioxan to give colourless tablets (M.p. 410–413 K) suitable for X-ray analysis.
IR (KBr cm-1): (C=O amide 1661), (NH 3301), (C=N 1606) (C—H, Ar 3021–3072), (C—H aliphatic 2836–2957). 1H-NMR: (DMSO-d6) δ at 3.6(s, 3H, –OCH3), 2.3(s, 3H, CH3), 3.4(s, 2H, –CH2), 6.5(d,1H, –CH= alkene), 6.6(d,1H, –CH= alkene), 8.2(d, 1H, –CH=N), 11.8(s, 1H, –NH amide), the aromatic protons of indole nuclei and benzene ring were appeared in the range of 7.0–7.9. 13C-NMR: 161(C=O amide), 149(–CH=N), 55(–OCH3), 10(1 C, CH3), 136(–C=C alkene), 125(–C=C alkene).
C-bound H atoms were placed in geometrically idealized positions and constrained to ride on their parent atoms with C—H = 0.95–0.99 Å, with Uiso(H) = 1.5 Uiso(C) for methyl H atoms and Uiso(H) = 1.2 Uiso(C) for other H atoms. H atoms bonded to N atoms were located in difference Fourier maps [N1—H1 = 0.891 (18) Å and N2—H2 = 0.903 (16) Å] and refined isotropically.
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: ORTEP-3 for Windows (Farrugia, 2012) and and PLATON (Spek, 2009); software used to prepare material for publication: WinGX (Farrugia, 2012) and PLATON (Spek, 2009).Fig. 1. Perspective view of the title molecule with 50% probability displacement ellipsoids. | |
Fig. 2. Partial view of the R22(8) and R22(14) cyclic dimers, down the a axis. | |
Fig. 3. Packing of the title molecule viewed down a with the hydrogen bonds shown by dotted lines. |
C21H21N3O2 | Z = 2 |
Mr = 347.41 | F(000) = 368 |
Triclinic, P1 | Dx = 1.300 Mg m−3 |
Hall symbol: -P 1 | Mo Kα radiation, λ = 0.71073 Å |
a = 8.2786 (9) Å | Cell parameters from 8428 reflections |
b = 10.1194 (11) Å | θ = 2.6–29.1° |
c = 11.7739 (13) Å | µ = 0.09 mm−1 |
α = 93.001 (2)° | T = 150 K |
β = 108.993 (2)° | Tablet, clear colourless |
γ = 105.578 (2)° | 0.26 × 0.13 × 0.08 mm |
V = 887.76 (17) Å3 |
Bruker SMART APEX CCD diffractometer | 4574 independent reflections |
Radiation source: fine-focus sealed tube | 3675 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.041 |
Detector resolution: 8.3660 pixels mm-1 | θmax = 29.1°, θmin = 1.9° |
ϕ and ω scans | h = −11→10 |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | k = −13→13 |
Tmin = 0.78, Tmax = 0.99 | l = −16→15 |
16303 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)] = 0.045 | H atoms treated by a mixture of independent and constrained refinement |
wR(F2) = 0.126 | W = 1/[Σ2(FO2) + (0.0677P)2 + 0.0983P] WHERE P = (FO2 + 2FC2)/3 |
S = 1.08 | (Δ/σ)max = 0.001 |
4574 reflections | Δρmax = 0.36 e Å−3 |
245 parameters | Δρmin = −0.25 e Å−3 |
0 restraints |
C21H21N3O2 | γ = 105.578 (2)° |
Mr = 347.41 | V = 887.76 (17) Å3 |
Triclinic, P1 | Z = 2 |
a = 8.2786 (9) Å | Mo Kα radiation |
b = 10.1194 (11) Å | µ = 0.09 mm−1 |
c = 11.7739 (13) Å | T = 150 K |
α = 93.001 (2)° | 0.26 × 0.13 × 0.08 mm |
β = 108.993 (2)° |
Bruker SMART APEX CCD diffractometer | 4574 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2013) | 3675 reflections with I > 2σ(I) |
Tmin = 0.78, Tmax = 0.99 | Rint = 0.041 |
16303 measured reflections |
R[F2 > 2σ(F2)] = 0.045 | 0 restraints |
wR(F2) = 0.126 | H atoms treated by a mixture of independent and constrained refinement |
S = 1.08 | Δρmax = 0.36 e Å−3 |
4574 reflections | Δρmin = −0.25 e Å−3 |
245 parameters |
Experimental. The diffraction data were obtained from 3 sets of 400 frames, each of width 0.5° in ω, colllected at ϕ = 0.00, 90.00 and 180.00° and 2 sets of 800 frames, each of width 0.45° in ϕ, collected at ω = -30.00 and 210.00°. The scan time was 15 sec/frame. |
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 | ||
O1 | 0.28193 (13) | 0.03509 (10) | 0.57833 (8) | 0.0383 (3) | |
O2 | 1.01220 (10) | 0.33474 (8) | 1.05582 (8) | 0.0235 (3) | |
N1 | 0.76159 (13) | −0.14643 (9) | 0.92901 (9) | 0.0233 (3) | |
N2 | 0.76767 (12) | 0.39782 (9) | 0.96609 (9) | 0.0198 (3) | |
N3 | 0.58483 (12) | 0.37175 (9) | 0.92778 (9) | 0.0213 (3) | |
C1 | 0.1780 (2) | −0.04316 (16) | 0.46126 (12) | 0.0406 (4) | |
C2 | 0.40353 (16) | −0.01850 (12) | 0.65687 (11) | 0.0261 (3) | |
C3 | 0.44402 (17) | −0.13776 (12) | 0.62313 (11) | 0.0289 (3) | |
C4 | 0.56565 (16) | −0.18727 (11) | 0.70752 (11) | 0.0264 (3) | |
C5 | 0.64546 (14) | −0.11740 (10) | 0.82602 (11) | 0.0210 (3) | |
C6 | 0.61147 (14) | 0.00623 (10) | 0.85962 (10) | 0.0190 (3) | |
C7 | 0.48756 (14) | 0.05444 (11) | 0.77385 (10) | 0.0216 (3) | |
C8 | 0.92662 (16) | −0.04883 (12) | 1.14821 (11) | 0.0266 (3) | |
C9 | 0.80675 (14) | −0.04222 (11) | 1.02468 (11) | 0.0212 (3) | |
C10 | 0.71796 (14) | 0.05319 (10) | 0.98586 (10) | 0.0190 (3) | |
C11 | 0.73269 (15) | 0.18427 (10) | 1.06001 (10) | 0.0203 (3) | |
C12 | 0.84755 (14) | 0.31009 (10) | 1.02798 (10) | 0.0184 (3) | |
C13 | 0.52187 (15) | 0.45707 (11) | 0.86269 (10) | 0.0217 (3) | |
C14 | 0.33089 (15) | 0.43345 (11) | 0.81838 (11) | 0.0235 (3) | |
C15 | 0.24928 (15) | 0.51098 (12) | 0.74611 (11) | 0.0245 (3) | |
C16 | 0.05663 (15) | 0.49356 (11) | 0.70035 (10) | 0.0223 (3) | |
C17 | −0.06817 (16) | 0.38488 (12) | 0.72362 (11) | 0.0257 (3) | |
C18 | −0.24894 (16) | 0.37336 (13) | 0.68079 (11) | 0.0289 (3) | |
C19 | −0.30851 (17) | 0.47052 (15) | 0.61408 (12) | 0.0342 (4) | |
C20 | −0.18776 (18) | 0.57806 (15) | 0.58911 (12) | 0.0350 (4) | |
C21 | −0.00671 (17) | 0.58889 (13) | 0.63135 (11) | 0.0291 (3) | |
H1 | 0.827 (2) | −0.2041 (17) | 0.9322 (15) | 0.044 (4)* | |
H1A | 0.25730 | −0.05190 | 0.41690 | 0.0610* | |
H1B | 0.09370 | 0.00410 | 0.41640 | 0.0610* | |
H1C | 0.11120 | −0.13570 | 0.46960 | 0.0610* | |
H2 | 0.838 (2) | 0.4754 (16) | 0.9519 (13) | 0.032 (4)* | |
H3 | 0.38760 | −0.18480 | 0.54180 | 0.0350* | |
H4 | 0.59380 | −0.26740 | 0.68470 | 0.0320* | |
H7 | 0.46140 | 0.13600 | 0.79550 | 0.0260* | |
H8A | 0.98240 | 0.04490 | 1.19500 | 0.0400* | |
H8B | 1.02000 | −0.08780 | 1.14140 | 0.0400* | |
H8C | 0.85640 | −0.10790 | 1.18960 | 0.0400* | |
H11A | 0.78640 | 0.17950 | 1.14750 | 0.0240* | |
H11B | 0.61160 | 0.19340 | 1.04460 | 0.0240* | |
H13 | 0.59940 | 0.53380 | 0.84430 | 0.0260* | |
H14 | 0.25880 | 0.35810 | 0.84210 | 0.0280* | |
H15 | 0.32320 | 0.58470 | 0.72200 | 0.0290* | |
H17 | −0.02820 | 0.31800 | 0.76950 | 0.0310* | |
H18 | −0.33210 | 0.29880 | 0.69720 | 0.0350* | |
H19 | −0.43240 | 0.46330 | 0.58550 | 0.0410* | |
H20 | −0.22870 | 0.64450 | 0.54300 | 0.0420* | |
H21 | 0.07530 | 0.66240 | 0.61290 | 0.0350* |
U11 | U22 | U33 | U12 | U13 | U23 | |
O1 | 0.0382 (5) | 0.0443 (5) | 0.0258 (5) | 0.0207 (4) | −0.0034 (4) | 0.0015 (4) |
O2 | 0.0174 (4) | 0.0182 (4) | 0.0346 (5) | 0.0081 (3) | 0.0066 (3) | 0.0048 (3) |
N1 | 0.0215 (5) | 0.0171 (4) | 0.0333 (5) | 0.0093 (4) | 0.0093 (4) | 0.0057 (4) |
N2 | 0.0159 (4) | 0.0161 (4) | 0.0280 (5) | 0.0064 (3) | 0.0072 (4) | 0.0047 (4) |
N3 | 0.0161 (4) | 0.0197 (4) | 0.0277 (5) | 0.0069 (3) | 0.0064 (4) | 0.0016 (4) |
C1 | 0.0359 (8) | 0.0526 (8) | 0.0244 (7) | 0.0121 (6) | 0.0006 (6) | 0.0028 (6) |
C2 | 0.0228 (6) | 0.0271 (5) | 0.0261 (6) | 0.0082 (4) | 0.0052 (5) | 0.0048 (5) |
C3 | 0.0302 (6) | 0.0265 (6) | 0.0257 (6) | 0.0048 (5) | 0.0083 (5) | −0.0029 (5) |
C4 | 0.0277 (6) | 0.0190 (5) | 0.0338 (7) | 0.0063 (4) | 0.0138 (5) | 0.0002 (4) |
C5 | 0.0181 (5) | 0.0161 (5) | 0.0297 (6) | 0.0054 (4) | 0.0095 (4) | 0.0040 (4) |
C6 | 0.0162 (5) | 0.0162 (4) | 0.0252 (6) | 0.0045 (4) | 0.0084 (4) | 0.0034 (4) |
C7 | 0.0201 (5) | 0.0191 (5) | 0.0264 (6) | 0.0074 (4) | 0.0078 (5) | 0.0041 (4) |
C8 | 0.0227 (6) | 0.0250 (5) | 0.0329 (6) | 0.0098 (4) | 0.0076 (5) | 0.0126 (5) |
C9 | 0.0174 (5) | 0.0180 (5) | 0.0285 (6) | 0.0057 (4) | 0.0075 (4) | 0.0071 (4) |
C10 | 0.0165 (5) | 0.0163 (4) | 0.0244 (5) | 0.0054 (4) | 0.0068 (4) | 0.0048 (4) |
C11 | 0.0210 (5) | 0.0183 (5) | 0.0227 (5) | 0.0075 (4) | 0.0076 (4) | 0.0044 (4) |
C12 | 0.0190 (5) | 0.0159 (4) | 0.0206 (5) | 0.0075 (4) | 0.0059 (4) | 0.0004 (4) |
C13 | 0.0205 (5) | 0.0191 (5) | 0.0265 (6) | 0.0085 (4) | 0.0076 (5) | 0.0024 (4) |
C14 | 0.0199 (5) | 0.0220 (5) | 0.0278 (6) | 0.0080 (4) | 0.0065 (5) | 0.0021 (4) |
C15 | 0.0204 (5) | 0.0242 (5) | 0.0301 (6) | 0.0088 (4) | 0.0084 (5) | 0.0059 (4) |
C16 | 0.0212 (5) | 0.0248 (5) | 0.0223 (5) | 0.0115 (4) | 0.0059 (4) | 0.0019 (4) |
C17 | 0.0239 (6) | 0.0260 (5) | 0.0281 (6) | 0.0116 (4) | 0.0071 (5) | 0.0043 (5) |
C18 | 0.0230 (6) | 0.0335 (6) | 0.0282 (6) | 0.0074 (5) | 0.0082 (5) | 0.0003 (5) |
C19 | 0.0224 (6) | 0.0487 (8) | 0.0317 (7) | 0.0172 (5) | 0.0049 (5) | 0.0051 (6) |
C20 | 0.0320 (7) | 0.0429 (7) | 0.0341 (7) | 0.0226 (6) | 0.0066 (6) | 0.0131 (6) |
C21 | 0.0272 (6) | 0.0319 (6) | 0.0307 (6) | 0.0136 (5) | 0.0089 (5) | 0.0095 (5) |
O1—C1 | 1.4195 (17) | C16—C17 | 1.3991 (17) |
O1—C2 | 1.3793 (16) | C17—C18 | 1.384 (2) |
O2—C12 | 1.2432 (15) | C18—C19 | 1.3842 (19) |
N1—C5 | 1.3824 (16) | C19—C20 | 1.382 (2) |
N1—C9 | 1.3822 (15) | C20—C21 | 1.388 (2) |
N2—N3 | 1.3758 (15) | C1—H1A | 0.9800 |
N2—C12 | 1.3512 (15) | C1—H1B | 0.9800 |
N3—C13 | 1.2866 (15) | C1—H1C | 0.9800 |
N1—H1 | 0.891 (18) | C3—H3 | 0.9500 |
N2—H2 | 0.903 (16) | C4—H4 | 0.9500 |
C2—C7 | 1.3856 (16) | C7—H7 | 0.9500 |
C2—C3 | 1.4073 (18) | C8—H8A | 0.9800 |
C3—C4 | 1.3871 (18) | C8—H8B | 0.9800 |
C4—C5 | 1.3888 (17) | C8—H8C | 0.9800 |
C5—C6 | 1.4179 (15) | C11—H11A | 0.9900 |
C6—C10 | 1.4354 (16) | C11—H11B | 0.9900 |
C6—C7 | 1.3986 (16) | C13—H13 | 0.9500 |
C8—C9 | 1.4869 (17) | C14—H14 | 0.9500 |
C9—C10 | 1.3748 (16) | C15—H15 | 0.9500 |
C10—C11 | 1.5030 (15) | C17—H17 | 0.9500 |
C11—C12 | 1.5169 (15) | C18—H18 | 0.9500 |
C13—C14 | 1.4409 (19) | C19—H19 | 0.9500 |
C14—C15 | 1.3328 (17) | C20—H20 | 0.9500 |
C15—C16 | 1.4645 (19) | C21—H21 | 0.9500 |
C16—C21 | 1.3936 (17) | ||
C1—O1—C2 | 117.79 (11) | C16—C21—C20 | 121.01 (13) |
C5—N1—C9 | 109.03 (9) | O1—C1—H1A | 109.00 |
N3—N2—C12 | 121.25 (9) | O1—C1—H1B | 109.00 |
N2—N3—C13 | 116.02 (10) | O1—C1—H1C | 109.00 |
C9—N1—H1 | 121.1 (11) | H1A—C1—H1B | 109.00 |
C5—N1—H1 | 127.1 (11) | H1A—C1—H1C | 109.00 |
N3—N2—H2 | 120.7 (11) | H1B—C1—H1C | 109.00 |
C12—N2—H2 | 118.1 (11) | C2—C3—H3 | 120.00 |
O1—C2—C3 | 123.67 (11) | C4—C3—H3 | 120.00 |
O1—C2—C7 | 115.35 (11) | C3—C4—H4 | 121.00 |
C3—C2—C7 | 120.98 (12) | C5—C4—H4 | 121.00 |
C2—C3—C4 | 120.58 (11) | C2—C7—H7 | 121.00 |
C3—C4—C5 | 118.66 (11) | C6—C7—H7 | 120.00 |
C4—C5—C6 | 121.15 (11) | C9—C8—H8A | 109.00 |
N1—C5—C6 | 107.51 (10) | C9—C8—H8B | 109.00 |
N1—C5—C4 | 131.34 (10) | C9—C8—H8C | 109.00 |
C5—C6—C10 | 106.84 (10) | H8A—C8—H8B | 109.00 |
C7—C6—C10 | 133.62 (10) | H8A—C8—H8C | 109.00 |
C5—C6—C7 | 119.50 (10) | H8B—C8—H8C | 109.00 |
C2—C7—C6 | 119.01 (11) | C10—C11—H11A | 109.00 |
N1—C9—C8 | 120.64 (10) | C10—C11—H11B | 109.00 |
N1—C9—C10 | 109.46 (10) | C12—C11—H11A | 109.00 |
C8—C9—C10 | 129.81 (11) | C12—C11—H11B | 109.00 |
C6—C10—C11 | 126.11 (10) | H11A—C11—H11B | 108.00 |
C9—C10—C11 | 126.77 (10) | N3—C13—H13 | 121.00 |
C6—C10—C9 | 107.10 (10) | C14—C13—H13 | 121.00 |
C10—C11—C12 | 110.76 (10) | C13—C14—H14 | 118.00 |
N2—C12—C11 | 118.76 (11) | C15—C14—H14 | 118.00 |
O2—C12—N2 | 118.88 (10) | C14—C15—H15 | 117.00 |
O2—C12—C11 | 122.36 (10) | C16—C15—H15 | 117.00 |
N3—C13—C14 | 118.40 (11) | C16—C17—H17 | 119.00 |
C13—C14—C15 | 123.95 (11) | C18—C17—H17 | 120.00 |
C14—C15—C16 | 126.31 (11) | C17—C18—H18 | 120.00 |
C15—C16—C17 | 122.69 (11) | C19—C18—H18 | 120.00 |
C15—C16—C21 | 119.29 (11) | C18—C19—H19 | 120.00 |
C17—C16—C21 | 118.02 (12) | C20—C19—H19 | 120.00 |
C16—C17—C18 | 121.03 (11) | C19—C20—H20 | 120.00 |
C17—C18—C19 | 119.96 (12) | C21—C20—H20 | 120.00 |
C18—C19—C20 | 119.99 (14) | C16—C21—H21 | 119.00 |
C19—C20—C21 | 119.99 (13) | C20—C21—H21 | 120.00 |
C1—O1—C2—C3 | 7.23 (19) | C5—C6—C10—C11 | 176.91 (11) |
C1—O1—C2—C7 | −173.47 (12) | C7—C6—C10—C9 | 176.05 (13) |
C9—N1—C5—C4 | 178.38 (13) | C7—C6—C10—C11 | −5.5 (2) |
C9—N1—C5—C6 | −2.32 (13) | N1—C9—C10—C6 | 0.16 (14) |
C5—N1—C9—C8 | 178.24 (11) | N1—C9—C10—C11 | −178.30 (11) |
C5—N1—C9—C10 | 1.36 (14) | C8—C9—C10—C6 | −176.35 (12) |
C12—N2—N3—C13 | −175.51 (10) | C8—C9—C10—C11 | 5.2 (2) |
N3—N2—C12—O2 | 176.74 (10) | C6—C10—C11—C12 | −74.62 (15) |
N3—N2—C12—C11 | −2.72 (16) | C9—C10—C11—C12 | 103.55 (13) |
N2—N3—C13—C14 | 179.00 (10) | C10—C11—C12—O2 | −70.23 (14) |
O1—C2—C3—C4 | −178.89 (12) | C10—C11—C12—N2 | 109.21 (12) |
C7—C2—C3—C4 | 1.8 (2) | N3—C13—C14—C15 | −177.08 (12) |
O1—C2—C7—C6 | 179.33 (11) | C13—C14—C15—C16 | −178.72 (11) |
C3—C2—C7—C6 | −1.35 (19) | C14—C15—C16—C17 | −3.5 (2) |
C2—C3—C4—C5 | 0.5 (2) | C14—C15—C16—C21 | 176.09 (12) |
C3—C4—C5—N1 | 175.97 (13) | C15—C16—C17—C18 | 178.73 (11) |
C3—C4—C5—C6 | −3.25 (19) | C21—C16—C17—C18 | −0.85 (18) |
N1—C5—C6—C7 | −175.64 (11) | C15—C16—C21—C20 | −178.26 (12) |
N1—C5—C6—C10 | 2.37 (13) | C17—C16—C21—C20 | 1.33 (18) |
C4—C5—C6—C7 | 3.75 (18) | C16—C17—C18—C19 | −0.17 (19) |
C4—C5—C6—C10 | −178.25 (11) | C17—C18—C19—C20 | 0.7 (2) |
C5—C6—C7—C2 | −1.38 (17) | C18—C19—C20—C21 | −0.3 (2) |
C10—C6—C7—C2 | −178.75 (13) | C19—C20—C21—C16 | −0.8 (2) |
C5—C6—C10—C9 | −1.55 (13) |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O2i | 0.891 (18) | 2.093 (18) | 2.9841 (14) | 178.1 (9) |
N2—H2···O2ii | 0.903 (16) | 2.012 (16) | 2.9055 (13) | 170.0 (14) |
C7—H7···N3 | 0.95 | 2.54 | 3.3609 (15) | 145 |
C11—H11B···N3 | 0.99 | 2.34 | 2.7996 (15) | 107 |
Symmetry codes: (i) −x+2, −y, −z+2; (ii) −x+2, −y+1, −z+2. |
D—H···A | D—H | H···A | D···A | D—H···A |
N1—H1···O2i | 0.891 (18) | 2.093 (18) | 2.9841 (14) | 178.1 (9) |
N2—H2···O2ii | 0.903 (16) | 2.012 (16) | 2.9055 (13) | 170.0 (14) |
C7—H7···N3 | 0.95 | 2.54 | 3.3609 (15) | 145 |
Symmetry codes: (i) −x+2, −y, −z+2; (ii) −x+2, −y+1, −z+2. |
Acknowledgements
Manchester Metropolitan University, Tulane University and Erciyes University are gratefully acknowledged for supporting this study.
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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.
Indomethacin as other common anti-inflammatory drugs (NSAIDs) which are widely employed in the treatment of pain and inflammation has been reported to be associated with a number of undesirable effects, in particular gastrointestinal (GI) toxicity and ulceration (Agrawal et al., 2010; Champion et al., 1997; Allan & Fletcher, 1990) which represent a still unsolved therapeutic problem. Topical irritation by the free carboxylic group of Indomethacin is considered an important factor in establishing superficial stomach erosion (Schoen & Vender, 1989; Mitchell & Warner, 1999). Considerable attention has been focused on the development of bio-reversible derivatives of such pro-drugs to temporarily mask the acidic group as a promising means of reducing or abolishing the GI toxicity due to the local action mechanism (Halen et al., 2009). Based on such facts and continue to our on-going study in functionalization of NSAIDs we herein report the synthesis and crystal structure of the title compound.
The molecular conformation adopted by I in the crystal is "J" shaped (Fig. 1) and appears to be at least partially directed by a weak, intramolecular C7—H7···N3 hydrogen bond. The indole ring system is almostly planar [maximum deviations = -0.046 (1) Å for N1, -0.036 (1) Å for C2 and 0.035 (1) Å for C4] and the dihedral angle between it and the terminal phenyl ring is 79.10 (5)°.
In the crystal structure, the N—H···O hydrogen bonding consists of R22(8) rings (Etter et al., 1990) with 2 N2—H2···O2 contacts and R22(14) rings with 2 N1—H1···O2 contacts which form a chain running parallel to the b axis (Table 1, Figs. 2 & 3).