organic compounds\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

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ISSN: 2414-3146

Ethyl 5-(4-methyl­phen­yl)-2,4,5,7-tetra­aza­tri­cyclo[6.4.0.02,6]dodeca-1(8),3,6,9,11-penta­ene-3-carboxyl­ate

aNational Center of Energy Sciences and Nuclear Techniques, Rabat, Morocco, bLaboratory of Medicinal Chemistry, Faculty of Medicine and Pharmacy, Mohammed V University Rabat, Morocco, cLaboratoire de Chimie Organique Heterocyclique URAC 21, Av. Ibn Battouta, BP 1014, Faculté des Sciences, Université Mohammed V, Rabat, Morocco, and dDepartment of Chemistry, Tulane University, New Orleans, LA 70118, USA
*Correspondence e-mail: ahmed_moussaif@yahoo.com

Edited by W. T. A. Harrison, University of Aberdeen, Scotland (Received 12 June 2018; accepted 18 June 2018; online 22 June 2018)

In the title compound, C18H16N4O2, the dihedral angle between the fused tricyclic ring system and the pendant benzene ring is 11.03 (4)°. The C—O—C—C torsion angle in the ethyl ester is 102.97 (12)°. The mol­ecular conformation is supported by intra­molecular C—H⋯N and C—H⋯O hydrogen bonds, which close S(6) and S(7) rings, respectively. Aromatic ππ stacking is observed in the crystal [shortest centroid–centroid separation = 3.5274 (7) Å].

3D view (loading...)
[Scheme 3D1]
Chemical scheme
[Scheme 1]

Structure description

As a continuation of our research into benzimidazole derivatives (Moussaif et al. 2016[Moussaif, A., Ramli, Y., Sebbar, N. K., Essassi, E. M. & Mague, J. T. (2016). IUCrData, 1, x161948.], El Bakri et al. 2018[El Bakri, Y., Anouar, E. H., Ramli, Y., Essassi, E. M. & Mague, J. T. (2018). J. Mol. Struct. 1152, 154-162.]), the title compound (Fig. 1[link]) was prepared and characterized by single-crystal X-ray diffraction.

[Figure 1]
Figure 1
The title mol­ecule with 50% probability ellipsoids. The intra­molecular hydrogen bonds are shown as dashed lines.

The fused tricyclic unit deviates slightly from planarity as indicated by the dihedral angle of 3.87 (6)° between the planes of the C1/C6/N1/C7/N4 and the C7/N2/N3/C8/N4 rings and by the dihedral angle of 2.05 (6)° between the planes of the C1/C6/N1/C7/N4 and the C1–C6 rings. The plane of the pendant C12–C17 ring is inclined to that of the C7/N2/N3/C8/N4 ring by 7.70 (5)°, which is likely due to the combination of the intra­molecular C17—H17⋯N1 hydrogen bond (Table 1[link] and Fig. 2[link]) and the π-stacking inter­actions between C7/N2/N3/C8/N4 and C12–C17 rings in inversion-related pairs of mol­ecules [centroid–centroid separation = 3.5274 (7) Å, inter­planar angle = 7.70 (5)°]. The orientation of the carboxyl group of the ester substituent is partially determined by the intra­molecular C2—H2⋯O1 hydrogen bond.

Table 1
Hydrogen-bond geometry (Å, °)

D—H⋯A D—H H⋯A DA D—H⋯A
C2—H2⋯O1 0.941 (14) 2.498 (13) 3.1480 (14) 126.3 (11)
C17—H17⋯N1 0.956 (13) 2.490 (12) 3.1473 (14) 125.8 (10)
[Figure 2]
Figure 2
Packing viewed along the a-axis direction with π-stacking inter­actions shown as dashed lines.

Synthesis and crystallization

6 mmol of methyl­mercaptobenzimidazole was dissolved in 40 ml of THF and 8.1 mmol of di­phenyl­nitrile­imine and 8.1 mmol of TEA were added. The mixture was refluxed for 24 h using a chilled condenser and CaCl2 trap to minimize water ingress. After cooling, the salts were removed by filtration and the solvent was evaporated under reduced pressure. Light-yellow blocks were obtained by recrystallization from ethanol solution.

Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2[link].

Table 2
Experimental details

Crystal data
Chemical formula C18H16N4O2
Mr 320.35
Crystal system, space group Monoclinic, P21/n
Temperature (K) 100
a, b, c (Å) 9.2366 (11), 10.2045 (12), 16.1922 (18)
β (°) 92.144 (2)
V3) 1525.1 (3)
Z 4
Radiation type Mo Kα
μ (mm−1) 0.10
Crystal size (mm) 0.33 × 0.17 × 0.11
 
Data collection
Diffractometer Bruker SMART APEX CCD
Absorption correction Multi-scan (SADABS; Krause et al., 2015[Krause, L., Herbst-Irmer, R., Sheldrick, G. M. & Stalke, D. (2015). J. Appl. Cryst. 48, 3-10.])
Tmin, Tmax 0.88, 0.99
No. of measured, independent and observed [I > 2σ(I)] reflections 28729, 4119, 3269
Rint 0.034
(sin θ/λ)max−1) 0.688
 
Refinement
R[F2 > 2σ(F2)], wR(F2), S 0.044, 0.126, 1.10
No. of reflections 4119
No. of parameters 281
H-atom treatment All H-atom parameters refined
Δρmax, Δρmin (e Å−3) 0.43, −0.19
Computer programs: APEX3 and SAINT (Bruker, 2016[Bruker (2016). APEX3 and SAINT. Bruker AXS Inc., Madison, Wisconsin, USA.]), SHELXT (Sheldrick, 2015a[Sheldrick, G. M. (2015a). Acta Cryst. A71, 3-8.]), SHELXL2018 (Sheldrick, 2015b[Sheldrick, G. M. (2015b). Acta Cryst. C71, 3-8.]), DIAMOND (Brandenburg & Putz, 2012[Brandenburg, K. & Putz, H. (2012). DIAMOND, Crystal Impact GbR, Bonn, Germany.]) and SHELXTL (Sheldrick, 2008[Sheldrick, G. M. (2008). Acta Cryst. A64, 112-122.]).

Structural data


Computing details top

Data collection: APEX3 (Bruker, 2016); cell refinement: SAINT (Bruker, 2016); data reduction: SAINT (Bruker, 2016); program(s) used to solve structure: SHELXT (Sheldrick, 2015a); program(s) used to refine structure: SHELXL2018 (Sheldrick, 2015b); molecular graphics: DIAMOND (Brandenburg & Putz, 2012); software used to prepare material for publication: SHELXTL (Sheldrick, 2008).

Ethyl 5-(4-methylphenyl)-2,4,5,7-tetraazatricyclo[6.4.0.02,6]dodeca-1(8),3,6,9,11-pentaene-3-carboxylate top
Crystal data top
C18H16N4O2F(000) = 672
Mr = 320.35Dx = 1.395 Mg m3
Monoclinic, P21/nMo Kα radiation, λ = 0.71073 Å
a = 9.2366 (11) ÅCell parameters from 9939 reflections
b = 10.2045 (12) Åθ = 2.5–29.2°
c = 16.1922 (18) ŵ = 0.10 mm1
β = 92.144 (2)°T = 100 K
V = 1525.1 (3) Å3Column, light yellow
Z = 40.33 × 0.17 × 0.11 mm
Data collection top
Bruker SMART APEX CCD
diffractometer
4119 independent reflections
Radiation source: fine-focus sealed tube3269 reflections with I > 2σ(I)
Graphite monochromatorRint = 0.034
Detector resolution: 8.3333 pixels mm-1θmax = 29.3°, θmin = 2.4°
φ and ω scansh = 1212
Absorption correction: multi-scan
(SADABS; Krause et al., 2015)
k = 1314
Tmin = 0.88, Tmax = 0.99l = 2221
28729 measured reflections
Refinement top
Refinement on F2Primary atom site location: structure-invariant direct methods
Least-squares matrix: fullSecondary atom site location: difference Fourier map
R[F2 > 2σ(F2)] = 0.044Hydrogen site location: difference Fourier map
wR(F2) = 0.126All H-atom parameters refined
S = 1.10 w = 1/[σ2(Fo2) + (0.0837P)2]
where P = (Fo2 + 2Fc2)/3
4119 reflections(Δ/σ)max < 0.001
281 parametersΔρmax = 0.43 e Å3
0 restraintsΔρmin = 0.19 e Å3
Special details top

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 20 sec/frame.

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.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å2) top
xyzUiso*/Ueq
O10.27907 (9)0.03912 (8)0.51898 (5)0.0305 (2)
O20.22672 (9)0.16022 (8)0.40455 (5)0.0291 (2)
N10.73373 (10)0.31219 (9)0.59612 (5)0.0225 (2)
N20.59679 (9)0.35622 (8)0.46266 (5)0.0204 (2)
N30.47218 (10)0.30038 (8)0.42909 (5)0.0214 (2)
N40.53322 (10)0.20134 (8)0.54708 (5)0.0198 (2)
C10.56736 (11)0.14534 (10)0.62432 (6)0.0207 (2)
C20.50476 (12)0.04636 (10)0.66949 (6)0.0232 (2)
H20.4245 (16)0.0026 (14)0.6496 (8)0.033 (3)*
C30.56831 (12)0.02072 (11)0.74701 (7)0.0260 (2)
H30.5272 (15)0.0462 (12)0.7811 (8)0.029 (3)*
C40.68767 (12)0.09204 (11)0.77778 (7)0.0262 (2)
H40.7286 (15)0.0763 (13)0.8336 (8)0.031 (3)*
C50.75050 (12)0.19019 (11)0.73189 (7)0.0246 (2)
H50.8333 (16)0.2357 (12)0.7552 (8)0.035 (4)*
C60.69074 (11)0.21704 (10)0.65324 (6)0.0212 (2)
C70.63534 (11)0.29777 (10)0.53647 (6)0.0201 (2)
C80.43553 (12)0.20874 (10)0.48072 (6)0.0209 (2)
C90.30540 (12)0.12523 (10)0.47099 (6)0.0231 (2)
C100.09331 (13)0.08760 (12)0.38572 (8)0.0315 (3)
H10A0.0950 (14)0.0742 (12)0.3234 (8)0.029 (3)*
H10B0.1026 (15)0.0018 (15)0.4127 (8)0.041 (4)*
C110.03431 (15)0.16685 (15)0.41023 (9)0.0382 (3)
H11A0.0357 (17)0.1755 (15)0.4712 (10)0.049 (4)*
H11B0.1280 (16)0.1198 (14)0.3897 (8)0.041 (4)*
H11C0.0356 (17)0.2555 (15)0.3833 (9)0.044 (4)*
C120.66049 (11)0.46589 (9)0.42400 (6)0.0192 (2)
C130.58932 (11)0.52255 (10)0.35533 (6)0.0215 (2)
H130.4937 (14)0.4852 (12)0.3339 (7)0.027 (3)*
C140.65297 (12)0.62930 (10)0.31773 (6)0.0233 (2)
H140.5988 (14)0.6704 (13)0.2681 (8)0.034 (3)*
C150.78523 (12)0.68054 (10)0.34691 (6)0.0229 (2)
C160.85299 (12)0.62162 (11)0.41557 (7)0.0248 (2)
H160.9471 (16)0.6601 (13)0.4358 (9)0.038 (4)*
C170.79222 (12)0.51494 (11)0.45474 (7)0.0233 (2)
H170.8409 (14)0.4748 (12)0.5014 (8)0.024 (3)*
C180.85216 (15)0.79542 (12)0.30434 (9)0.0329 (3)
H18A0.881 (2)0.7749 (17)0.2454 (12)0.078 (6)*
H18B0.9384 (18)0.8226 (15)0.3336 (9)0.049 (4)*
H18C0.786 (2)0.870 (2)0.2983 (12)0.082 (6)*
Atomic displacement parameters (Å2) top
U11U22U33U12U13U23
O10.0370 (5)0.0272 (4)0.0273 (4)0.0104 (3)0.0013 (3)0.0036 (3)
O20.0304 (4)0.0284 (4)0.0279 (4)0.0084 (3)0.0064 (3)0.0036 (3)
N10.0221 (5)0.0253 (5)0.0199 (4)0.0003 (4)0.0001 (3)0.0028 (3)
N20.0214 (4)0.0208 (4)0.0188 (4)0.0022 (3)0.0002 (3)0.0005 (3)
N30.0227 (4)0.0208 (4)0.0205 (4)0.0029 (3)0.0003 (3)0.0018 (3)
N40.0227 (4)0.0184 (4)0.0183 (4)0.0001 (3)0.0007 (3)0.0005 (3)
C10.0231 (5)0.0208 (5)0.0185 (5)0.0036 (4)0.0016 (4)0.0002 (4)
C20.0238 (5)0.0207 (5)0.0253 (5)0.0010 (4)0.0031 (4)0.0007 (4)
C30.0295 (6)0.0242 (5)0.0246 (5)0.0033 (4)0.0064 (4)0.0051 (4)
C40.0279 (6)0.0298 (6)0.0211 (5)0.0059 (4)0.0025 (4)0.0038 (4)
C50.0225 (5)0.0279 (6)0.0233 (5)0.0025 (4)0.0010 (4)0.0008 (4)
C60.0213 (5)0.0209 (5)0.0214 (5)0.0018 (4)0.0039 (4)0.0011 (4)
C70.0209 (5)0.0205 (5)0.0191 (5)0.0003 (4)0.0027 (4)0.0001 (4)
C80.0244 (5)0.0185 (5)0.0200 (5)0.0005 (4)0.0014 (4)0.0020 (4)
C90.0263 (5)0.0204 (5)0.0226 (5)0.0029 (4)0.0010 (4)0.0032 (4)
C100.0337 (6)0.0284 (6)0.0317 (6)0.0108 (5)0.0083 (5)0.0022 (5)
C110.0339 (7)0.0448 (8)0.0365 (7)0.0162 (6)0.0078 (5)0.0090 (6)
C120.0213 (5)0.0176 (5)0.0189 (4)0.0003 (4)0.0039 (4)0.0011 (4)
C130.0226 (5)0.0207 (5)0.0211 (5)0.0010 (4)0.0018 (4)0.0007 (4)
C140.0262 (5)0.0214 (5)0.0223 (5)0.0020 (4)0.0031 (4)0.0019 (4)
C150.0238 (5)0.0188 (5)0.0265 (5)0.0008 (4)0.0071 (4)0.0009 (4)
C160.0214 (5)0.0245 (5)0.0285 (5)0.0017 (4)0.0023 (4)0.0016 (4)
C170.0231 (5)0.0234 (5)0.0232 (5)0.0000 (4)0.0001 (4)0.0010 (4)
C180.0297 (6)0.0251 (6)0.0447 (7)0.0028 (5)0.0096 (5)0.0079 (5)
Geometric parameters (Å, º) top
O1—C91.2038 (13)C8—C91.4770 (15)
O2—C91.3246 (13)C10—C111.4953 (19)
O2—C101.4603 (13)C10—H10A1.019 (13)
N1—C71.3094 (13)C10—H10B1.014 (15)
N1—C61.4083 (13)C11—H11A0.992 (16)
N2—C71.3709 (12)C11—H11B1.034 (15)
N2—N31.3777 (12)C11—H11C1.004 (15)
N2—C121.4207 (13)C12—C171.3905 (15)
N3—C81.3072 (13)C12—C131.3957 (14)
N4—C71.3783 (14)C13—C141.3891 (14)
N4—C81.3791 (13)C13—H131.011 (13)
N4—C11.4002 (12)C14—C151.3950 (15)
C1—C21.3860 (14)C14—H141.020 (13)
C1—C61.4190 (14)C15—C161.3918 (15)
C2—C31.3905 (15)C15—C181.5045 (15)
C2—H20.941 (14)C16—C171.3889 (15)
C3—C41.3973 (17)C16—H160.999 (14)
C3—H30.965 (12)C17—H170.956 (13)
C4—C51.3872 (16)C18—H18A1.021 (19)
C4—H40.980 (14)C18—H18B0.952 (17)
C5—C61.3961 (14)C18—H18C0.98 (2)
C5—H50.960 (15)
C9—O2—C10117.77 (9)O2—C10—C11109.73 (10)
C7—N1—C6101.65 (9)O2—C10—H10A103.4 (7)
C7—N2—N3110.48 (8)C11—C10—H10A112.1 (7)
C7—N2—C12128.95 (8)O2—C10—H10B108.0 (8)
N3—N2—C12120.37 (8)C11—C10—H10B115.3 (8)
C8—N3—N2106.03 (8)H10A—C10—H10B107.5 (11)
C7—N4—C8107.14 (8)C10—C11—H11A110.6 (9)
C7—N4—C1105.68 (9)C10—C11—H11B108.8 (8)
C8—N4—C1146.85 (9)H11A—C11—H11B108.6 (12)
C2—C1—N4133.18 (10)C10—C11—H11C111.6 (9)
C2—C1—C6123.18 (9)H11A—C11—H11C110.6 (12)
N4—C1—C6103.63 (9)H11B—C11—H11C106.4 (12)
C1—C2—C3116.31 (10)C17—C12—C13121.06 (9)
C1—C2—H2123.0 (8)C17—C12—N2119.81 (9)
C3—C2—H2120.7 (8)C13—C12—N2119.14 (9)
C2—C3—C4121.64 (10)C14—C13—C12118.66 (10)
C2—C3—H3119.2 (8)C14—C13—H13121.6 (7)
C4—C3—H3119.1 (8)C12—C13—H13119.7 (7)
C5—C4—C3121.70 (10)C13—C14—C15121.67 (10)
C5—C4—H4117.3 (8)C13—C14—H14117.6 (8)
C3—C4—H4121.0 (8)C15—C14—H14120.7 (8)
C4—C5—C6118.12 (10)C16—C15—C14118.07 (10)
C4—C5—H5118.8 (8)C16—C15—C18121.49 (10)
C6—C5—H5123.1 (8)C14—C15—C18120.43 (10)
C5—C6—N1128.52 (10)C17—C16—C15121.74 (10)
C5—C6—C1119.02 (10)C17—C16—H16121.4 (8)
N1—C6—C1112.43 (9)C15—C16—H16116.9 (8)
N1—C7—N2138.13 (10)C16—C17—C12118.80 (10)
N1—C7—N4116.59 (9)C16—C17—H17120.7 (8)
N2—C7—N4105.22 (9)C12—C17—H17120.5 (8)
N3—C8—N4111.10 (9)C15—C18—H18A113.1 (10)
N3—C8—C9125.01 (9)C15—C18—H18B110.4 (9)
N4—C8—C9123.88 (9)H18A—C18—H18B106.6 (14)
O1—C9—O2127.09 (10)C15—C18—H18C112.8 (12)
O1—C9—C8122.38 (10)H18A—C18—H18C104.3 (15)
O2—C9—C8110.53 (9)H18B—C18—H18C109.3 (14)
C7—N2—N3—C80.56 (11)C1—N4—C7—N2177.11 (8)
C12—N2—N3—C8175.94 (8)N2—N3—C8—N40.66 (12)
C7—N4—C1—C2179.09 (11)N2—N3—C8—C9178.15 (9)
C8—N4—C1—C27.4 (2)C7—N4—C8—N31.62 (12)
C7—N4—C1—C60.22 (10)C1—N4—C8—N3173.26 (13)
C8—N4—C1—C6171.48 (14)C7—N4—C8—C9177.21 (9)
N4—C1—C2—C3177.77 (10)C1—N4—C8—C95.6 (2)
C6—C1—C2—C30.92 (15)C10—O2—C9—O10.36 (17)
C1—C2—C3—C40.69 (16)C10—O2—C9—C8179.86 (9)
C2—C3—C4—C51.30 (17)N3—C8—C9—O1177.45 (10)
C3—C4—C5—C60.26 (16)N4—C8—C9—O13.88 (17)
C4—C5—C6—N1179.03 (10)N3—C8—C9—O23.03 (15)
C4—C5—C6—C11.28 (15)N4—C8—C9—O2175.64 (10)
C7—N1—C6—C5176.48 (11)C9—O2—C10—C11102.97 (12)
C7—N1—C6—C11.39 (11)C7—N2—C12—C1710.61 (16)
C2—C1—C6—C51.94 (16)N3—N2—C12—C17174.96 (9)
N4—C1—C6—C5177.08 (9)C7—N2—C12—C13169.52 (9)
C2—C1—C6—N1179.97 (9)N3—N2—C12—C134.91 (14)
N4—C1—C6—N11.02 (11)C17—C12—C13—C140.22 (15)
C6—N1—C7—N2175.57 (12)N2—C12—C13—C14179.65 (9)
C6—N1—C7—N41.28 (12)C12—C13—C14—C150.02 (16)
N3—N2—C7—N1175.57 (12)C13—C14—C15—C160.06 (16)
C12—N2—C7—N10.7 (2)C13—C14—C15—C18179.39 (10)
N3—N2—C7—N41.52 (11)C14—C15—C16—C170.07 (16)
C12—N2—C7—N4176.39 (9)C18—C15—C16—C17179.52 (11)
C8—N4—C7—N1175.98 (9)C15—C16—C17—C120.28 (16)
C1—N4—C7—N10.72 (12)C13—C12—C17—C160.35 (16)
C8—N4—C7—N21.85 (11)N2—C12—C17—C16179.52 (9)
Hydrogen-bond geometry (Å, º) top
D—H···AD—HH···AD···AD—H···A
C2—H2···O10.941 (14)2.498 (13)3.1480 (14)126.3 (11)
C17—H17···N10.956 (13)2.490 (12)3.1473 (14)125.8 (10)
 

Funding information

JTM thanks Tulane University for support of the Tulane Crystallography Laboratory.

References

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