Crystal structure and Hirshfeld surface analysis of ethyl 2-(7-chloro-3-methyl-2-oxo-1,2-di­hydro­quinoxalin-1-yl)acetate

Mustaphi, N.E.H.; Aboutofil, F.E.; El Houssni, L.; Saif, E.; Mague, J.T.; Chkirate, K.; Essassi, E.M.

doi:10.1107/S2056989024002664

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ISSN: 2056-9890

Volume 80| Part 4| April 2024| Pages 430-434

https://doi.org/10.1107/S2056989024002664

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Crystal structure and Hirshfeld surface analysis of ethyl 2-(7-chloro-3-methyl-2-oxo-1,2-dihydroquinoxalin-1-yl)acetate

Nour El Hoda Mustaphi,^a,^b Fatima Ezzahra Aboutofil,^a Lamyae El Houssni,^a Eiad Saif,^c Joel T. Mague,^d Karim Chkirate ^a and El Mokhtar Essassi ^a ^*

^aLaboratory of Heterocyclic Organic Chemistry URAC 21, Pharmacochemistry Competence Center, Av. Ibn Battouta, BP 1014, Faculty of Sciences, Mohammed V University in Rabat, Morocco, ^bEcole Nationale Supérieure de Chimie, Université Ibn TofaÏl, Kénitra, Morocco, ^cDepartment of Computer and Electronic Engineering Technology, Sanaa Community College, Sanaa, Yemen, and ^dDepartment of Chemistry, Tulane University, New Orleans, LA 70118, USA
^*Correspondence e-mail: emessassi@yahoo.fr

Edited by L. Van Meervelt, Katholieke Universiteit Leuven, Belgium (Received 11 March 2024; accepted 21 March 2024; online 26 March 2024)

The quinoxaline moiety in the title molecule, C₁₃H₁₃ClN₂O₃, is almost planar (r.m.s. deviation of the fitted atoms = 0.033 Å). In the crystal, C—H⋯O hydrogen bonds plus slipped π-stacking and C—H⋯π(ring) interactions generate chains of molecules extending along the b-axis direction. The chains are connected by additional C—H⋯O hydrogen bonds. Hirshfeld surface analysis indicates that the most important contributions to the crystal packing are from H⋯H (37.6%), H⋯O/O⋯H (22.7%) and H⋯Cl/Cl⋯H (13.1%) interactions.

Keywords: crystal structure; C—H⋯π(ring) interaction; π-stacking; hydrogen bond; quinoxaline.

CCDC reference: 2342203

1. Chemical context

Nitrogen-based structures have attracted more attention in recent years because of their interesting properties in structural and inorganic chemistry (Faraj et al., 2022 ; Chkirate et al., 2022a ,b , 2023 ; Al Ati et al., 2024 ). The family of quinoxalines, particularly those containing the 2-oxoquinoxaline moiety, is important in medicinal chemistry because of their wide range of pharmacological applications such as antibacterial activity (Chkirate et al., 2022c ) and as potential anticancer agents (Abad et al., 2023 ). In particular, 3-methyl-2-oxoquinoxaline is a cytotoxic (Missioui et al., 2022a ) and anticonvulsant agent (Ibrahim et al., 2013 ) and has anti-COVID-19 and anti-Alzheimer's disease (Missioui et al., 2022b ) activities. Given the wide range of therapeutic applications for such compounds, and in a continuation of the work already carried out on the synthesis of compounds from 2-oxoquinoxaline, a similar approach gave the title compound, ethyl 2-(7-chloro-3-methyl-2-oxoquinoxaline-1(2H)-yl)acetate C₁₃H₁₃ClN₂O₃ (I). Besides the synthesis, we also report the molecular and crystalline structures along with a Hirshfeld surface analysis.

2. Structural commentary

The quinoxaline moiety is almost planar (r.m.s. deviation of the fitted atoms = 0.033 Å) with largest deviations being observed for atom C8 [0.072 (5) Å] to one side and atom N2 [−0.072 (5) Å] on the other side of the mean plane. The dihedral angle between the mean planes of the two six-membered rings making up the quinoxaline moiety is 2.1 (2)°. The ester group is rotated well out of the plane of the quinoxaline moiety, as indicated by the C8—N2—C10—C11 torsion angle of −88.2 (5)° (Fig. 1).

Figure 1
The title molecule with labeling scheme and 50% probability ellipsoids.

3. Supramolecular features

In the crystal, C2—H2⋯O2 and C10—H10A⋯O2 hydrogen bonds reinforced by C9—H9A⋯Cg1 interactions (Table 1) and slipped π-stacking interactions between the C1/C6/N1/C7/C8/N2 and C1–C6 rings [centroid–centroid distance = 3.756 (3) Å, dihedral angle = 2.1 (2)°, slippage = 1.39 Å] lead to the formation of chains of molecules extending along the b-axis direction (Fig. 2). The chains are connected by C12—H12A⋯O1 and C13—H13A⋯O1 hydrogen bonds (Table 1), which form the full three-dimensional structure (Fig. 3).

Table 1
Hydrogen-bond geometry (Å, °)

Cg1 is the centroid of the C1/C6/N1/C7/C8/N2 ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C2—H2⋯O2ⁱ	0.95	2.39	3.211 (6)	145
C9—H9A⋯Cg1ⁱⁱ	0.98	2.73	3.591 (6)	147
C10—H10A⋯O2ⁱ	0.99	2.59	3.535 (7)	159
C12—H12A⋯O1ⁱⁱⁱ	0.99	2.49	3.471 (9)	170
C13—H13A⋯O1^iv	0.98	2.49	3.427 (7)	160
Symmetry codes: (i) ; (ii) ; (iii) $[-x+1, -y+2, z-{\script{1\over 2}}]$ ; (iv) $[-x+1, -y+1, z-{\script{1\over 2}}]$ .

Figure 2
A portion of one chain viewed along the a-axis direction with C—H⋯O hydrogen bonds and C—H⋯π(ring) interactions depicted, respectively, by black and light blue dashed lines. Slipped π-stacking interactions are depicted by orange dashed lines and non-interacting hydrogen atoms are omitted for clarity.

Figure 3
Packing viewed along the c-axis direction with C—H⋯O hydrogen bonds and C—H⋯π(ring) interactions depicted, respectively, by black and light-blue dashed lines. Non-interacting hydrogen atoms and π-stacking interactions are omitted for clarity.

4. Hirshfeld surface analysis

CrystalExplorer (Turner et al., 2017 ) was used to investigate and visualize the intermolecular interactions of (I). The Hirshfeld surface plotted over d_norm in the range −0.2466 to 1.0065 a.u. is shown in Fig. 4a. The electrostatic potential using the STO-3G basis set at the Hartree–Fock level of theory and mapped on the Hirshfeld surface over the range ±0.05 a.u. clearly shows the positions of close intermolecular contacts in the compound (Fig. 4b). The positive electrostatic potential (blue region) over the surface indicates hydrogen-donor potential, whereas the hydrogen-bond acceptors are represented by negative electrostatic potential (red region). In the standard d_norm surface (Fig. 5), the C—H⋯O hydrogen bonds to the closest neighboring molecules are depicted by green dashed lines.

Figure 4
(a) View of the three-dimensional Hirshfeld surface of the title compound, plotted over d_norm and (b) view of the three-dimensional Hirshfeld surface of the title compound plotted over electrostatic potential energy using the STO-3 G basis set at the Hartree–Fock level of theory.

Figure 5
(a) Front and (b) back sides of the three-dimensional Hirshfeld surface of the compound mapped over d_norm.

The overall two-dimensional fingerprint plot (McKinnon et al., 2007 ) is shown in Fig. 6a, while those delineated into H⋯H, H⋯O/O⋯H, H⋯Cl/Cl⋯H, H⋯C/C⋯H, H⋯N/N⋯H, C⋯C, Cl⋯C/C⋯Cl and N⋯C/C⋯N contacts are illustrated in Fig. 6b–i, respectively, together with their relative contributions to the Hirshfeld surface (HS). The most important interaction is H⋯H, contributing 37.6% to the overall crystal packing, which is reflected in Fig. 6b as widely scattered points of high density due to the large hydrogen content of the molecule, with the tip at d_e = d_i = 1.16 Å. The H⋯O/O⋯H interactions shown by the pair of characteristic wings in the fingerprint plot delineated into these contacts (22.7% contribution to the HS), Fig. 6c, has the tips at d_e + d_i = 2.25 Å. The pair of scattered points of spikes in the fingerprint plot delineated into H⋯Cl/Cl⋯H, Fig. 6d (13.1%), have the tips at d_e + d_i = 2.84 Å. The H⋯C/C⋯H contacts, Fig. 6e (9.6%), have the tips at d_e + d_i = 2.94 Å. The H⋯N/N⋯H contacts, Fig. 6f, contribute 4.9% to the HS and appear as a pair of scattered points of spikes with the tips at d_e + d_i = 2.53 Å. The C⋯C contacts, Fig. 6g (4%), have the tips at d_e + d_i = 3.46 Å. Finally, the Cl⋯C/C⋯Cl and N⋯C/C⋯N contacts, Fig. 6h–i, contribute only 3.4% and 2.5%, respectively, to the HS and have a low-density distribution of points.

Figure 6
The full two-dimensional fingerprint plots for the title compound, showing (a) all interactions, and delineated into (b) H⋯H, (c) H⋯O/O⋯H, (d) H⋯Cl/Cl⋯H, (e) H⋯C/C⋯H, (f) H⋯N/N⋯H, (g) C⋯C, (h) Cl⋯C/C⋯Cl and (i) N⋯C/C⋯N interactions. The d_i and d_e values are the closest internal and external distances (in Å) from given points on the Hirshfeld surface.

5. Database survey

A search of the Cambridge Structural Database (CSD version 5.42, updated May 2021; Groom et al., 2016 ) with the 2-(3-methyl-2-oxoquinoxalin-1(2H)-yl)acetyl fragment yielded multiple matches. Of these, two had a substituent on C11 comparable to (I) (Fig. 7). The first compound (II) (refcode DEZJAW; Missioui et al., 2018 ) carries a hydroxyl group on C11, while the second one (III) (refcode UGAMEY; Missioui et al., 2023 ) carries a p-tolylazane substituent. The acetic acid part in DEZJAW forms a dihedral angle of −93.62 (11)° with 3-methyl-2-oxoquinoxaline unit. In UGAMEY, the dihedral angles between the mean planes of the N-(p-tolyl)acetylamide (two positions with occupancies 0.50:0.50) and 3-methyl-2-oxoquinoxaline rings are 104.1 (2) and −71.0 (2)°. As previously mentioned, the ethyl acetate group in (I) is also almost perpendicular to the 3-methyl-2-oxoquinoxaline unit [dihedral angle of −88.2 (5)°], which is approximately the same as in DEZJAW, and in between the two values in UGAMEY.

Figure 7
Structures similar to (I)

: (II) (CSD refcode DEZJAW) and (III) (CSD refcode UGAMEY) obtained during the database search. The search fragment is indicated in blue.

6. Synthesis and crystallization

1.00 g (6.24 mmol) of 7-chloro-3-methylquinoxalin-2(1H)-one was dissolved in 25 mL of dimethylformamide and 1.15 g (6.24 mmol) of ethyl 2-chloroacetate were added, followed by 1.0 g (7.5 mmol) of potassium bicarbonate, and a spatula tip of BTBA (benzyltributylammonium chloride) was used as a phase-transfer catalyst. The reaction was stirred for 2 h under reflux at 353 K. When the starting reagents had completely reacted, 500 mL of distilled water were added and a few minutes later the product precipitated. This was filtered off, dried and recrystallized from hot ethanol solution to yield light-yellow plate-like crystals of the title compound. ¹H NMR (300 MHz, CDCl₃) δ ppm: 1.21 (t, 3H, CH₃, J = 6 Hz); 2.07 (s, 3H, CH₃); 4.16 (quin, 2H, CH₂); 4.59 (s, 2H, CH₂); 7.18–7.87 (m, 3H, CH_arom). ¹³C NMR (75 MHz, CDCl₃) δ ppm: 14.1 (CH₃); 21.3 (CH₃); 51.6(CH₂); 61.0 (CH₂); 123.3–125.7 (CH_arom); 131.2–155.6 (C_q); 155.7 (C=O); 167.6 (C=O).

7. Refinement

Crystal data, data collection and structure refinement details are summarized in Table 2. The structure was refined as an inversion twin. Hydrogen atoms were were included as riding contributions in idealized positions and refined isotropically.

Table 2
Experimental details

Crystal data
Chemical formula	C₁₃H₁₃ClN₂O₃
M_r	280.70
Crystal system, space group	Orthorhombic, Pca2₁
Temperature (K)	150
a, b, c (Å)	22.8042 (11), 4.7826 (2), 11.7421 (6)
V (Å³)	1280.63 (10)
Z	4
Radiation type	Cu Kα
μ (mm⁻¹)	2.71
Crystal size (mm)	0.21 × 0.14 × 0.13

Data collection
Diffractometer	Bruker D8 VENTURE PHOTON 3 CPAD
Absorption correction	Multi-scan (SADABS; Krause et al., 2015 )
T_min, T_max	0.60, 0.72
No. of measured, independent and observed [I > 2σ(I)] reflections	22953, 2495, 2468
R_int	0.050
(sin θ/λ)_max (Å⁻¹)	0.619

Refinement
R[F² > 2σ(F²)], wR(F²), S	0.058, 0.160, 1.09
No. of reflections	2495
No. of parameters	175
No. of restraints	1
H-atom treatment	H-atom parameters constrained
Δρ_max, Δρ_min (e Å⁻³)	1.27, −0.32
Absolute structure	Refined as an inversion twin
Absolute structure parameter	0.17 (4)
Computer programs: APEX4 and SAINT (Bruker, 2021 ), SHELXS and SHELXTL (Sheldrick, 2008 ), SHELXL2018/1 (Sheldrick, 2015 ) and DIAMOND (Brandenburg & Putz, 2012 ).

Supporting information

CCDC reference: 2342203

Crystal structure: contains datablocks global, I. DOI: https://doi.org/10.1107/S2056989024002664/vm2299sup1.cif

Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S2056989024002664/vm2299Isup2.hkl

Supporting information file. DOI: https://doi.org/10.1107/S2056989024002664/vm2299Isup3.cml

checkCIF report

Computing details top

Ethyl 2-(7-chloro-3-methyl-2-oxo-1,2-dihydroquinoxalin-1-yl)acetate top

Crystal data top

C₁₃H₁₃ClN₂O₃	D_x = 1.456 Mg m⁻³
M_r = 280.70	Cu Kα radiation, λ = 1.54178 Å
Orthorhombic, Pca2₁	Cell parameters from 9927 reflections
a = 22.8042 (11) Å	θ = 7.8–72.1°
b = 4.7826 (2) Å	µ = 2.71 mm⁻¹
c = 11.7421 (6) Å	T = 150 K
V = 1280.63 (10) Å³	Column, colourless
Z = 4	0.21 × 0.14 × 0.13 mm
F(000) = 584

Data collection top

Bruker D8 VENTURE PHOTON 3 CPAD diffractometer	2495 independent reflections
Radiation source: INCOATEC IµS micro–focus source	2468 reflections with I > 2σ(I)
Mirror monochromator	R_int = 0.050
Detector resolution: 7.3910 pixels mm^-1	θ_max = 72.6°, θ_min = 3.9°
φ and ω scans	h = −28→28
Absorption correction: multi-scan (SADABS; Krause et al., 2015)	k = −5→5
T_min = 0.60, T_max = 0.72	l = −14→14
22953 measured reflections

Refinement top

Refinement on F²	Secondary atom site location: difference Fourier map
Least-squares matrix: full	Hydrogen site location: inferred from neighbouring sites
R[F² > 2σ(F²)] = 0.058	H-atom parameters constrained
wR(F²) = 0.160	w = 1/[σ²(F_o²) + (0.0982P)² + 1.0105P] where P = (F_o² + 2F_c²)/3
S = 1.09	(Δ/σ)_max < 0.001
2495 reflections	Δρ_max = 1.27 e Å⁻³
175 parameters	Δρ_min = −0.32 e Å⁻³
1 restraint	Absolute structure: Refined as an inversion twin
Primary atom site location: dual	Absolute structure parameter: 0.17 (4)

Special details top

Experimental. The diffraction data were obtained from 16 sets of frames, each of width 0.5° in ω or φ, collected with scan parameters determined by the "strategy" routine in APEX4. The scan time was θ-dependent and ranged from 5 to 15 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. H-atoms attached to carbon were placed in calculated positions (C—H = 0.95 - 0.98 Å). All were included as riding contributions with isotropic displacement parameters 1.2 - 1.5 times those of the attached atoms. Refined as a 2-component inversion twin.

Fractional atomic coordinates and isotropic or equivalent isotropic displacement parameters (Å²) top

	x	y	z	U_iso*/U_eq
Cl1	0.22614 (6)	−0.1052 (3)	0.52846 (14)	0.0525 (4)
O1	0.47152 (17)	0.8955 (8)	0.5839 (3)	0.0431 (9)
O2	0.3705 (2)	0.8166 (9)	0.3693 (4)	0.0522 (10)
O3	0.4279 (2)	0.5252 (9)	0.2694 (3)	0.0510 (10)
N1	0.3653 (2)	0.7081 (9)	0.7912 (4)	0.0376 (9)
N2	0.40226 (18)	0.5540 (8)	0.5727 (3)	0.0341 (8)
C1	0.3515 (2)	0.4330 (10)	0.6175 (4)	0.0328 (9)
C2	0.3181 (2)	0.2376 (10)	0.5565 (4)	0.0357 (10)
H2	0.329386	0.182454	0.481938	0.043*
C3	0.2688 (2)	0.1272 (10)	0.6067 (5)	0.0394 (11)
C4	0.2514 (3)	0.1981 (12)	0.7161 (5)	0.0442 (11)
H4	0.217756	0.115043	0.749633	0.053*
C5	0.2844 (3)	0.3931 (11)	0.7754 (5)	0.0444 (12)
H5	0.273074	0.444011	0.850445	0.053*
C6	0.3340 (2)	0.5161 (10)	0.7271 (4)	0.0364 (10)
C7	0.4108 (2)	0.8277 (10)	0.7453 (4)	0.0365 (10)
C8	0.4309 (2)	0.7692 (10)	0.6277 (4)	0.0346 (10)
C9	0.4464 (3)	1.0300 (12)	0.8123 (5)	0.0448 (12)
H9A	0.446634	1.211426	0.773475	0.067*
H9B	0.486658	0.960415	0.819087	0.067*
H9C	0.429315	1.051443	0.888356	0.067*
C10	0.4272 (2)	0.4636 (11)	0.4646 (4)	0.0370 (10)
H10A	0.418454	0.262610	0.453586	0.044*
H10B	0.470335	0.484805	0.467859	0.044*
C11	0.4041 (2)	0.6255 (10)	0.3634 (4)	0.0352 (10)
C12	0.4143 (4)	0.6646 (14)	0.1619 (5)	0.0614 (18)
H12A	0.449004	0.769649	0.134877	0.074*
H12B	0.381753	0.798883	0.173224	0.074*
C13	0.3973 (3)	0.4535 (14)	0.0764 (6)	0.0529 (14)
H13A	0.430353	0.326874	0.062697	0.079*
H13B	0.386631	0.547199	0.005148	0.079*
H13C	0.363703	0.346276	0.104623	0.079*

Atomic displacement parameters (Å²) top

	U¹¹	U²²	U³³	U¹²	U¹³	U²³
Cl1	0.0496 (7)	0.0478 (7)	0.0602 (8)	−0.0075 (5)	0.0026 (6)	−0.0130 (7)
O1	0.0500 (19)	0.042 (2)	0.0375 (17)	0.0019 (15)	0.0010 (15)	−0.0006 (16)
O2	0.073 (3)	0.045 (2)	0.0387 (19)	0.022 (2)	−0.0015 (18)	−0.0020 (17)
O3	0.086 (3)	0.0414 (19)	0.0255 (17)	0.021 (2)	0.0055 (16)	−0.0018 (15)
N1	0.051 (2)	0.0289 (19)	0.0324 (19)	0.0053 (18)	−0.0003 (17)	−0.0023 (16)
N2	0.045 (2)	0.0297 (18)	0.0272 (18)	0.0082 (16)	−0.0025 (16)	−0.0030 (16)
C1	0.041 (2)	0.025 (2)	0.033 (2)	0.0080 (17)	−0.0022 (18)	0.0004 (17)
C2	0.046 (2)	0.031 (2)	0.031 (2)	0.0069 (19)	−0.0023 (17)	−0.0051 (18)
C3	0.045 (3)	0.028 (2)	0.045 (3)	0.0014 (18)	−0.004 (2)	−0.001 (2)
C4	0.049 (3)	0.040 (3)	0.044 (3)	−0.004 (2)	0.004 (2)	−0.003 (2)
C5	0.058 (3)	0.040 (3)	0.036 (3)	0.002 (2)	0.008 (2)	0.000 (2)
C6	0.049 (3)	0.030 (2)	0.030 (2)	0.007 (2)	−0.0062 (18)	−0.0018 (18)
C7	0.049 (3)	0.032 (2)	0.028 (2)	0.010 (2)	−0.008 (2)	−0.0016 (19)
C8	0.042 (2)	0.029 (2)	0.032 (2)	0.004 (2)	0.0002 (18)	0.0014 (18)
C9	0.061 (3)	0.037 (3)	0.036 (3)	−0.001 (2)	−0.004 (2)	−0.006 (2)
C10	0.045 (2)	0.038 (3)	0.028 (2)	0.008 (2)	−0.0005 (19)	−0.003 (2)
C11	0.045 (2)	0.030 (2)	0.030 (2)	−0.0013 (19)	−0.0002 (19)	−0.0033 (18)
C12	0.109 (6)	0.043 (3)	0.032 (3)	0.008 (3)	0.001 (3)	0.003 (2)
C13	0.056 (3)	0.054 (3)	0.049 (3)	0.008 (3)	−0.012 (3)	0.000 (3)

Geometric parameters (Å, º) top

Cl1—C3	1.739 (5)	C5—C6	1.395 (8)
O1—C8	1.220 (6)	C5—H5	0.9500
O2—C11	1.194 (7)	C7—C8	1.482 (6)
O3—C11	1.320 (6)	C7—C9	1.487 (7)
O3—C12	1.460 (7)	C9—H9A	0.9800
N1—C7	1.302 (7)	C9—H9B	0.9800
N1—C6	1.385 (7)	C9—H9C	0.9800
N2—C8	1.379 (6)	C10—C11	1.514 (7)
N2—C1	1.397 (7)	C10—H10A	0.9900
N2—C10	1.456 (6)	C10—H10B	0.9900
C1—C2	1.402 (7)	C12—C13	1.475 (9)
C1—C6	1.405 (7)	C12—H12A	0.9900
C2—C3	1.375 (7)	C12—H12B	0.9900
C2—H2	0.9500	C13—H13A	0.9800
C3—C4	1.387 (8)	C13—H13B	0.9800
C4—C5	1.386 (8)	C13—H13C	0.9800
C4—H4	0.9500

C11—O3—C12	118.0 (4)	N2—C8—C7	115.5 (4)
C7—N1—C6	118.5 (4)	C7—C9—H9A	109.5
C8—N2—C1	121.7 (4)	C7—C9—H9B	109.5
C8—N2—C10	116.4 (4)	H9A—C9—H9B	109.5
C1—N2—C10	121.9 (4)	C7—C9—H9C	109.5
N2—C1—C2	122.3 (4)	H9A—C9—H9C	109.5
N2—C1—C6	117.6 (4)	H9B—C9—H9C	109.5
C2—C1—C6	120.1 (5)	N2—C10—C11	113.4 (4)
C3—C2—C1	118.8 (4)	N2—C10—H10A	108.9
C3—C2—H2	120.6	C11—C10—H10A	108.9
C1—C2—H2	120.6	N2—C10—H10B	108.9
C2—C3—C4	122.4 (5)	C11—C10—H10B	108.9
C2—C3—Cl1	118.5 (4)	H10A—C10—H10B	107.7
C4—C3—Cl1	119.1 (4)	O2—C11—O3	126.2 (5)
C5—C4—C3	118.4 (5)	O2—C11—C10	124.6 (5)
C5—C4—H4	120.8	O3—C11—C10	109.1 (4)
C3—C4—H4	120.8	O3—C12—C13	109.3 (5)
C4—C5—C6	121.3 (5)	O3—C12—H12A	109.8
C4—C5—H5	119.3	C13—C12—H12A	109.8
C6—C5—H5	119.3	O3—C12—H12B	109.8
N1—C6—C5	118.4 (4)	C13—C12—H12B	109.8
N1—C6—C1	122.6 (5)	H12A—C12—H12B	108.3
C5—C6—C1	118.9 (5)	C12—C13—H13A	109.5
N1—C7—C8	123.3 (4)	C12—C13—H13B	109.5
N1—C7—C9	120.1 (4)	H13A—C13—H13B	109.5
C8—C7—C9	116.6 (5)	C12—C13—H13C	109.5
O1—C8—N2	122.1 (4)	H13A—C13—H13C	109.5
O1—C8—C7	122.3 (5)	H13B—C13—H13C	109.5

C8—N2—C1—C2	172.3 (4)	C2—C1—C6—C5	2.5 (7)
C10—N2—C1—C2	−6.5 (7)	C6—N1—C7—C8	0.1 (7)
C8—N2—C1—C6	−7.0 (6)	C6—N1—C7—C9	−178.6 (4)
C10—N2—C1—C6	174.2 (4)	C1—N2—C8—O1	−172.2 (4)
N2—C1—C2—C3	179.8 (4)	C10—N2—C8—O1	6.7 (7)
C6—C1—C2—C3	−0.9 (7)	C1—N2—C8—C7	10.5 (6)
C1—C2—C3—C4	−1.2 (8)	C10—N2—C8—C7	−170.6 (4)
C1—C2—C3—Cl1	177.7 (3)	N1—C7—C8—O1	175.5 (5)
C2—C3—C4—C5	1.7 (8)	C9—C7—C8—O1	−5.8 (7)
Cl1—C3—C4—C5	−177.1 (4)	N1—C7—C8—N2	−7.2 (7)
C3—C4—C5—C6	−0.1 (9)	C9—C7—C8—N2	171.5 (4)
C7—N1—C6—C5	−178.5 (4)	C8—N2—C10—C11	−88.2 (5)
C7—N1—C6—C1	4.0 (7)	C1—N2—C10—C11	90.7 (5)
C4—C5—C6—N1	−179.6 (5)	C12—O3—C11—O2	2.6 (9)
C4—C5—C6—C1	−2.0 (8)	C12—O3—C11—C10	−176.1 (5)
N2—C1—C6—N1	−0.7 (6)	N2—C10—C11—O2	2.8 (7)
C2—C1—C6—N1	180.0 (4)	N2—C10—C11—O3	−178.5 (4)
N2—C1—C6—C5	−178.2 (4)	C11—O3—C12—C13	−131.7 (6)

Hydrogen-bond geometry (Å, º) top

Cg1 is the centroid of the C1/C6/N1/C7/C8/N2 ring.

D—H···A	D—H	H···A	D···A	D—H···A
C2—H2···O2ⁱ	0.95	2.39	3.211 (6)	145
C9—H9A···Cg1ⁱⁱ	0.98	2.73	3.591 (6)	147
C10—H10A···O2ⁱ	0.99	2.59	3.535 (7)	159
C12—H12A···O1ⁱⁱⁱ	0.99	2.49	3.471 (9)	170
C13—H13A···O1^iv	0.98	2.49	3.427 (7)	160

Symmetry codes: (i) x, y−1, z; (ii) x, y+1, z; (iii) −x+1, −y+2, z−1/2; (iv) −x+1, −y+1, z−1/2.

Funding information

The support of NSF-MRI grant No. 1228232 for the purchase of the diffractometer and Tulane University for support of the Tulane Crystallography Laboratory are gratefully acknowledged.

References

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research communications\(\def\hfill{\hskip 5em}\def\hfil{\hskip 3em}\def\eqno#1{\hfil {#1}}\)

Crystal structure and Hirshfeld surface analysis of ethyl 2-(7-chloro-3-methyl-2-oxo-1,2-di­hydro­quinoxalin-1-yl)acetate

1. Chemical context

2. Structural commentary

3. Supra­molecular features

4. Hirshfeld surface analysis

5. Database survey

6. Synthesis and crystallization

7. Refinement

Supporting information

Funding information

References

research communications

Crystal structure and Hirshfeld surface analysis of ethyl 2-(7-chloro-3-methyl-2-oxo-1,2-dihydroquinoxalin-1-yl)acetate

3. Supramolecular features