organic compounds
6-(2-Chlorobenzyl)-1-(4-chlorophenyl)-7-hydroxy-2,3-dihydro-1H-imidazo[1,2-a]pyrimidin-5-one
aDepartment of Chemistry, University of Podlasie, ul. 3 Maja 54, 08-110 Siedlce, Poland, bDepartment of Synthesis and Chemical Technology of Pharmaceutical Substances, Medical University, ul. Staszica 6, 20-081 Lublin, Poland, and cInstitute of Organic Chemistry, Polish Academy of Sciences, ul. Kasprzaka 44/52, 01-224 Warsaw 42, POB 58, Poland
*Correspondence e-mail: darek.matosiuk@am.lublin.pl
The title compound, C19H15Cl2N3O2, was obtained by a one-step cyclocondensation of 2-amino-1-(4-chlorophenyl)imidazoline with diethyl (2-chlorobenzyl)malonate under basic conditions. In the crystalline state, the molecule exists as the 7-hydroxy-5-oxo tautomer. The dihedral angles between the fused imidazopyrimidine and aromatic chlorophenyl and chlorobenzyl rings are 14.2 (1) and 70.7 (1)°, respectively. The conformation of the molecule is influenced by the intramolecular C—H⋯O and C—H⋯N hydrogen bonds, giving a nearly planar five-ring fused system [maximum deviation from the mean plane = 0.296 (2) Å]. In the strong intermolecular O—H⋯O hydrogen bonds link the molecules into chains along the c axis. These chains are further stabilized by weak C—H⋯Cl and π–π interactions [centroid–centroid distance = 3.6707 (12) Å].
Related literature
For background to dioxo derivatives of fused imidazoline ring systems, their biological activity and medical applications, see: Matosiuk, Fidecka, Antkiewicz-Michaluk, Dybała et al. (2002); Matosiuk, Fidecka, Antkiewicz-Michaluk, Lipkowski et al. (2002). For the synthesis, see: Rządkowska et al. (2004). For a related structure, see: Wysocki et al. (2006). For structure interpretation tools, see: Allen et al. (1995); Allen (2002); Bruno et al. (2002). For resonance-assisted hydrogen bonds, see: Gilli et al. (1989).
Experimental
Crystal data
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Refinement
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Data collection: APEX2 (Bruker, 2005); cell SAINT (Bruker, 2005); 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 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).
Supporting information
https://doi.org/10.1107/S160053681003919X/fj2343sup1.cif
contains datablocks I, global. DOI:Structure factors: contains datablock I. DOI: https://doi.org/10.1107/S160053681003919X/fj2343Isup2.hkl
The title compound, C19H15Cl2N3O2 (I), was obtained by one-step cyclocondensation of 1-(4-chlorophenyl)-2-aminoimidazoline-2 with diethyl (2-chlorobenzyl)malonate under basic (sodium methoxide) conditions (Rządkowska et al., 2004). Crystals suitable for X-ray
were grown by slow evaporation of a propan-2-ol solution.All H atoms were located in difference Fourier maps and refined freely with Uiso(H) values of 1.5Ueq(N,C, O).
Dioxo derivatives of fused imidazoline ring systems were found to have significant analgesic, opioid-like action but without typical narcotic analgesic side effects (Matosiuk, Fidecka, Antkiewicz-Michaluk, Dybała et al.., 2002; Matosiuk, Fidecka, Antkiewicz-Michaluk, Lipkowski et al., 2002). The X-ray analysis of the title compound, (I), was performed in order to confirm the synthesis pathway and identification of its tautomeric form in the solid state. The bond lengths, angles and planarity of the rings in the bicyclic imidazopyrimidine part of (I) are very similar to those observed in previously reported π-electron system and phenyl ring, belonging to inversion-related molecules overlap with the shortest intermolecular contact C2···C23iii of 3.270 (3) and the angle between overlapping planes of 13.33 (11)° characteristic for π-π interactions [(iii) = 1 - x, 1 - y, 1 - z].
of 6-(benzyl)-7-hydroxy-1-(2-methoxyphenyl)-2,3-dihydro-1H7H- imidazo[1,2-a]-pyrimidin-5-one (Wysocki et al. (2006). In the crystalline state, the molecule exists as 7-hydroxy-5-oxo tautomer, as evidenced by the C7—O10 [1.330 (2) Å], C9—O11 [1.242 (2) Å], C7—N6 [1.361 (2) Å], C2—N6 [1.305 (2) Å], C9—N3 [1.391 (2) Å] C2—N3 [1.358 (2) Å] bond lengths and the position of the H atom in the vicinity of O10 in difference electron-density map. The dihedral angles between the fused imidazopyrimidine and aromatic chlopophenyl and chlobobenzyl rings are 14.2 (1) and 70.7 (1)°, respectively. This conformation is influenced by the intramolecular C12—H122···O10 and C26—H261···N6 hydrogen bonds giving nearly co-planar five-ring fused system. In the strong intermolecular O10—H101···O11 resonance-assisted hydrogen bond (Gilli et al., 1989) links the molecules related by c-glide plane into chains along the c axis. Additionaly, molecules are joined in molecular chains parallel to [101] direction by a C33—H331···Cl27 hydrogen bond. Moreover, the guanidineFor background to dioxo derivatives of fused imidazoline ring systems, their biological activity and medical applications, see: Matosiuk, Fidecka, Antkiewicz-Michaluk, Dybała et al. (2002); Matosiuk, Fidecka, Antkiewicz-Michaluk, Lipkowski et al. (2002). For the synthesis, see: Rządkowska et al. (2004). For a related structure, see: Wysocki et al. (2006). For structure interpretation tools, see: Allen et al. (1995); Allen (2002); Bruno et al. (2002).
For related literature on ?, see: Gilli et al. (1989).
Data collection: APEX2 (Bruker, 2005); cell
SAINT (Bruker, 2005); data reduction: SAINT (Bruker, 2005); program(s) used to solve structure: SHELXS97 (Sheldrick, 2008); program(s) used to refine structure: SHELXL97 (Sheldrick, 2008); molecular graphics: ORTEP-3 (Farrugia, 1997); software used to prepare material for publication: WinGX (Farrugia, 1999).C19H15Cl2N3O2 | F(000) = 800 |
Mr = 388.24 | Dx = 1.506 Mg m−3 |
Monoclinic, P21/c | Cu Kα radiation, λ = 1.54178 Å |
Hall symbol: -P 2ybc | Cell parameters from 3410 reflections |
a = 11.4521 (3) Å | θ = 3.9–66.7° |
b = 12.8287 (4) Å | µ = 3.58 mm−1 |
c = 11.7255 (3) Å | T = 296 K |
β = 96.283 (2)° | Block, colourless |
V = 1712.31 (8) Å3 | 0.26 × 0.25 × 0.11 mm |
Z = 4 |
Bruker APEXII CCD diffractometer | 3040 independent reflections |
Radiation source: fine-focus sealed tube | 2521 reflections with I > 2σ(I) |
Graphite monochromator | Rint = 0.042 |
φ and ω scans | θmax = 67.8°, θmin = 3.9° |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | h = −13→12 |
Tmin = 0.415, Tmax = 0.674 | k = −15→8 |
12489 measured reflections | l = −13→13 |
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)] = 0.039 | Hydrogen site location: difference Fourier map |
wR(F2) = 0.112 | All H-atom parameters refined |
S = 1.05 | w = 1/[σ2(Fo2) + (0.0566P)2 + 0.4965P] where P = (Fo2 + 2Fc2)/3 |
3040 reflections | (Δ/σ)max < 0.001 |
280 parameters | Δρmax = 0.28 e Å−3 |
0 restraints | Δρmin = −0.29 e Å−3 |
C19H15Cl2N3O2 | V = 1712.31 (8) Å3 |
Mr = 388.24 | Z = 4 |
Monoclinic, P21/c | Cu Kα radiation |
a = 11.4521 (3) Å | µ = 3.58 mm−1 |
b = 12.8287 (4) Å | T = 296 K |
c = 11.7255 (3) Å | 0.26 × 0.25 × 0.11 mm |
β = 96.283 (2)° |
Bruker APEXII CCD diffractometer | 3040 independent reflections |
Absorption correction: multi-scan (SADABS; Bruker, 2005) | 2521 reflections with I > 2σ(I) |
Tmin = 0.415, Tmax = 0.674 | Rint = 0.042 |
12489 measured reflections |
R[F2 > 2σ(F2)] = 0.039 | 0 restraints |
wR(F2) = 0.112 | All H-atom parameters refined |
S = 1.05 | Δρmax = 0.28 e Å−3 |
3040 reflections | Δρmin = −0.29 e Å−3 |
280 parameters |
Geometry. All e.s.d.'s (except the e.s.d. in the dihedral angle between two l.s. planes) are estimated using the full covariance matrix. The cell e.s.d.'s are taken into account individually in the estimation of e.s.d.'s in distances, angles and torsion angles; correlations between e.s.d.'s in cell parameters are only used when they are defined by crystal symmetry. An approximate (isotropic) treatment of cell e.s.d.'s is used for estimating e.s.d.'s involving l.s. planes. Weighted least-squares planes through the starred atoms (Nardelli, Musatti, Domiano & Andreetti Ric.Sci.(1965),15(II—A),807). Equation of the plane: m1*X+m2*Y+m3*Z=d Plane 1 m1 = -0.57842(0.00033) m2 = -0.67971(0.00033) m3 = -0.45102(0.00053) D = -11.68389(0.00244) Atom d s d/s (d/s)**2 N1 * -0.0460 0.0016 - 28.384 805.647 C2 * 0.0029 0.0018 1.594 2.541 N3 * 0.0198 0.0015 13.215 174.625 C4 * -0.0357 0.0023 - 15.771 248.720 C5 * 0.0819 0.0023 36.135 1305.707 N6 * 0.0038 0.0015 2.558 6.543 C7 * 0.0139 0.0017 7.983 63.731 C8 * 0.0007 0.0018 0.384 0.147 C9 * -0.0243 0.0018 - 13.656 186.495 ============ Sum((d/s)**2) for starred atoms 2794.157 Chi-squared at 95% for 6 degrees of freedom: 12.60 The group of atoms deviates significantly from planarity Plane 2 m1 = -0.71141(0.00065) m2 = -0.48107(0.00093) m3 = -0.51231(0.00073) D = -11.40891(0.00306) Atom d s d/s (d/s)**2 C21 * 0.0042 0.0018 2.264 5.124 C22 * -0.0048 0.0022 - 2.159 4.661 C23 * -0.0012 0.0023 - 0.496 0.246 C24 * 0.0051 0.0021 2.408 5.797 C25 * -0.0050 0.0024 - 2.037 4.149 C26 * -0.0018 0.0023 - 0.782 0.611 ============ Sum((d/s)**2) for starred atoms 20.589 Chi-squared at 95% for 3 degrees of freedom: 7.81 The group of atoms deviates significantly from planarity Plane 3 m1 = -0.47124(0.00082) m2 = 0.42681(0.00103) m3 = -0.77186(0.00062) D = -3.90575(0.01406) Atom d s d/s (d/s)**2 C31 * -0.0026 0.0019 - 1.391 1.935 C32 * 0.0016 0.0021 0.757 0.573 C33 * 0.0031 0.0027 1.149 1.321 C34 * -0.0079 0.0031 - 2.556 6.533 C35 * 0.0042 0.0031 1.328 1.764 C36 * 0.0021 0.0024 0.859 0.738 ============ Sum((d/s)**2) for starred atoms 12.865 Chi-squared at 95% for 3 degrees of freedom: 7.81 The group of atoms deviates significantly from planarity Dihedral angles formed by LSQ-planes Plane - plane angle (s.u.) angle (s.u.) 1 2 14.18 (0.06) 165.82 (0.06) 1 3 70.69 (0.06) 109.31 (0.06) 2 3 58.31 (0.06) 121.69 (0.06) |
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 | ||
N1 | 0.54690 (14) | 0.58844 (13) | 0.65922 (13) | 0.0405 (4) | |
C2 | 0.45149 (16) | 0.63750 (14) | 0.69364 (15) | 0.0345 (4) | |
N3 | 0.42905 (13) | 0.59910 (12) | 0.79699 (12) | 0.0368 (4) | |
C4 | 0.5131 (2) | 0.51928 (18) | 0.84006 (18) | 0.0470 (5) | |
H41 | 0.560 (2) | 0.547 (2) | 0.910 (2) | 0.070* | |
H42 | 0.473 (2) | 0.454 (2) | 0.860 (2) | 0.070* | |
C5 | 0.5851 (2) | 0.50339 (18) | 0.73916 (18) | 0.0472 (5) | |
H51 | 0.670 (3) | 0.511 (2) | 0.762 (2) | 0.071* | |
H52 | 0.567 (2) | 0.430 (2) | 0.703 (2) | 0.071* | |
N6 | 0.39106 (13) | 0.71171 (12) | 0.63876 (12) | 0.0362 (4) | |
C7 | 0.30136 (15) | 0.75057 (14) | 0.69309 (14) | 0.0329 (4) | |
C8 | 0.27243 (16) | 0.71925 (14) | 0.79896 (15) | 0.0349 (4) | |
C9 | 0.34131 (16) | 0.63956 (14) | 0.85735 (14) | 0.0346 (4) | |
O10 | 0.24079 (12) | 0.82712 (10) | 0.63775 (11) | 0.0402 (3) | |
H101 | 0.268 (2) | 0.844 (2) | 0.576 (2) | 0.060* | |
O11 | 0.33241 (12) | 0.60419 (10) | 0.95466 (10) | 0.0423 (3) | |
C12 | 0.17750 (17) | 0.77055 (15) | 0.85764 (17) | 0.0390 (4) | |
H121 | 0.213 (2) | 0.7977 (18) | 0.933 (2) | 0.059* | |
H122 | 0.150 (2) | 0.832 (2) | 0.814 (2) | 0.059* | |
C21 | 0.59787 (16) | 0.60289 (15) | 0.55615 (15) | 0.0384 (4) | |
C22 | 0.67539 (19) | 0.52838 (18) | 0.52397 (19) | 0.0500 (5) | |
H221 | 0.691 (2) | 0.465 (2) | 0.568 (2) | 0.075* | |
C23 | 0.7284 (2) | 0.53957 (19) | 0.4242 (2) | 0.0534 (6) | |
H231 | 0.777 (3) | 0.490 (2) | 0.404 (2) | 0.080* | |
C24 | 0.70459 (18) | 0.62511 (18) | 0.35695 (18) | 0.0499 (5) | |
C25 | 0.6293 (2) | 0.7008 (2) | 0.3878 (2) | 0.0568 (6) | |
H251 | 0.617 (3) | 0.764 (2) | 0.342 (2) | 0.085* | |
C26 | 0.5754 (2) | 0.69008 (19) | 0.48719 (19) | 0.0511 (5) | |
H261 | 0.529 (2) | 0.742 (2) | 0.507 (2) | 0.077* | |
Cl27 | 0.77155 (6) | 0.63967 (6) | 0.23211 (5) | 0.0784 (2) | |
C31 | 0.07284 (16) | 0.70368 (15) | 0.87807 (16) | 0.0389 (4) | |
C32 | −0.00662 (18) | 0.73742 (19) | 0.95069 (17) | 0.0489 (5) | |
C33 | −0.1022 (2) | 0.6786 (3) | 0.9736 (2) | 0.0669 (7) | |
H331 | −0.152 (3) | 0.706 (3) | 1.024 (3) | 0.100* | |
C34 | −0.1203 (2) | 0.5828 (3) | 0.9241 (3) | 0.0747 (8) | |
H341 | −0.183 (3) | 0.540 (3) | 0.942 (3) | 0.112* | |
C35 | −0.0442 (2) | 0.5470 (2) | 0.8503 (3) | 0.0742 (8) | |
H351 | −0.054 (3) | 0.479 (3) | 0.814 (3) | 0.111* | |
C36 | 0.0516 (2) | 0.60699 (18) | 0.8281 (2) | 0.0541 (5) | |
H361 | 0.103 (3) | 0.581 (2) | 0.779 (2) | 0.081* | |
Cl37 | 0.01144 (6) | 0.85933 (6) | 1.01526 (7) | 0.0825 (3) |
U11 | U22 | U33 | U12 | U13 | U23 | |
N1 | 0.0425 (8) | 0.0461 (9) | 0.0342 (8) | 0.0134 (7) | 0.0110 (7) | 0.0067 (7) |
C2 | 0.0374 (9) | 0.0386 (9) | 0.0281 (8) | 0.0033 (8) | 0.0064 (7) | 0.0001 (7) |
N3 | 0.0419 (8) | 0.0412 (8) | 0.0283 (7) | 0.0055 (7) | 0.0082 (6) | 0.0041 (6) |
C4 | 0.0524 (12) | 0.0506 (12) | 0.0387 (10) | 0.0142 (10) | 0.0088 (9) | 0.0098 (10) |
C5 | 0.0523 (12) | 0.0496 (12) | 0.0405 (11) | 0.0157 (10) | 0.0089 (9) | 0.0103 (9) |
N6 | 0.0395 (8) | 0.0411 (8) | 0.0296 (7) | 0.0070 (7) | 0.0107 (6) | 0.0026 (6) |
C7 | 0.0364 (9) | 0.0338 (9) | 0.0293 (8) | 0.0012 (7) | 0.0071 (7) | 0.0003 (7) |
C8 | 0.0391 (9) | 0.0364 (9) | 0.0305 (9) | 0.0004 (8) | 0.0100 (7) | 0.0008 (8) |
C9 | 0.0397 (9) | 0.0368 (9) | 0.0284 (9) | −0.0036 (8) | 0.0082 (7) | −0.0026 (7) |
O10 | 0.0456 (7) | 0.0434 (7) | 0.0335 (7) | 0.0109 (6) | 0.0129 (6) | 0.0068 (6) |
O11 | 0.0570 (8) | 0.0452 (7) | 0.0265 (6) | 0.0006 (6) | 0.0127 (6) | 0.0035 (6) |
C12 | 0.0436 (10) | 0.0387 (10) | 0.0370 (10) | 0.0016 (8) | 0.0145 (8) | −0.0005 (9) |
C21 | 0.0363 (9) | 0.0467 (10) | 0.0334 (9) | 0.0055 (8) | 0.0092 (7) | −0.0008 (8) |
C22 | 0.0525 (12) | 0.0496 (12) | 0.0506 (12) | 0.0134 (10) | 0.0173 (10) | 0.0013 (10) |
C23 | 0.0525 (12) | 0.0555 (13) | 0.0557 (13) | 0.0110 (11) | 0.0212 (10) | −0.0078 (11) |
C24 | 0.0458 (11) | 0.0655 (14) | 0.0408 (11) | 0.0029 (10) | 0.0162 (9) | −0.0037 (10) |
C25 | 0.0606 (14) | 0.0656 (14) | 0.0476 (12) | 0.0159 (12) | 0.0211 (10) | 0.0134 (11) |
C26 | 0.0538 (12) | 0.0584 (13) | 0.0447 (11) | 0.0178 (11) | 0.0210 (9) | 0.0086 (10) |
Cl27 | 0.0858 (5) | 0.1015 (5) | 0.0555 (4) | 0.0106 (4) | 0.0425 (3) | 0.0026 (3) |
C31 | 0.0380 (9) | 0.0458 (10) | 0.0335 (9) | 0.0007 (8) | 0.0067 (7) | 0.0036 (8) |
C32 | 0.0413 (10) | 0.0673 (14) | 0.0395 (10) | 0.0036 (10) | 0.0105 (8) | 0.0005 (10) |
C33 | 0.0432 (12) | 0.104 (2) | 0.0555 (14) | −0.0044 (13) | 0.0165 (10) | 0.0133 (15) |
C34 | 0.0489 (13) | 0.092 (2) | 0.0832 (19) | −0.0194 (14) | 0.0082 (13) | 0.0247 (17) |
C35 | 0.0642 (16) | 0.0622 (15) | 0.094 (2) | −0.0200 (13) | −0.0012 (15) | −0.0006 (15) |
C36 | 0.0501 (12) | 0.0532 (13) | 0.0597 (14) | −0.0049 (10) | 0.0091 (10) | −0.0086 (11) |
Cl37 | 0.0628 (4) | 0.0959 (5) | 0.0929 (5) | 0.0075 (3) | 0.0269 (3) | −0.0442 (4) |
N1—C2 | 1.360 (2) | C21—C22 | 1.385 (3) |
N1—C21 | 1.411 (2) | C21—C26 | 1.388 (3) |
N1—C5 | 1.473 (2) | C22—C23 | 1.383 (3) |
C2—N6 | 1.305 (2) | C22—H221 | 0.97 (3) |
C2—N3 | 1.358 (2) | C23—C24 | 1.362 (3) |
N3—C9 | 1.391 (2) | C23—H231 | 0.90 (3) |
N3—C4 | 1.458 (2) | C24—C25 | 1.373 (3) |
C4—C5 | 1.528 (3) | C24—Cl27 | 1.735 (2) |
C4—H41 | 0.99 (3) | C25—C26 | 1.384 (3) |
C4—H42 | 0.99 (3) | C25—H251 | 0.97 (3) |
C5—H51 | 0.99 (3) | C26—H261 | 0.90 (3) |
C5—H52 | 1.04 (3) | C31—C36 | 1.382 (3) |
N6—C7 | 1.361 (2) | C31—C32 | 1.382 (3) |
C7—O10 | 1.330 (2) | C32—C33 | 1.381 (3) |
C7—C8 | 1.379 (2) | C32—Cl37 | 1.740 (2) |
C8—C9 | 1.421 (3) | C33—C34 | 1.364 (4) |
C8—C12 | 1.501 (2) | C33—H331 | 0.93 (3) |
C9—O11 | 1.242 (2) | C34—C35 | 1.374 (4) |
O10—H101 | 0.85 (3) | C34—H341 | 0.95 (4) |
C12—C31 | 1.514 (3) | C35—C36 | 1.388 (3) |
C12—H121 | 1.00 (3) | C35—H351 | 0.97 (4) |
C12—H122 | 0.97 (3) | C36—H361 | 0.93 (3) |
C2—N1—C21 | 127.93 (15) | H121—C12—H122 | 105.4 (19) |
C2—N1—C5 | 110.25 (15) | C22—C21—C26 | 118.77 (18) |
C21—N1—C5 | 121.37 (15) | C22—C21—N1 | 118.71 (18) |
N6—C2—N3 | 124.25 (16) | C26—C21—N1 | 122.50 (17) |
N6—C2—N1 | 126.25 (16) | C23—C22—C21 | 120.8 (2) |
N3—C2—N1 | 109.48 (15) | C23—C22—H221 | 117.5 (16) |
C2—N3—C9 | 122.42 (15) | C21—C22—H221 | 121.6 (16) |
C2—N3—C4 | 112.43 (15) | C24—C23—C22 | 119.7 (2) |
C9—N3—C4 | 124.92 (15) | C24—C23—H231 | 120.6 (19) |
N3—C4—C5 | 102.55 (15) | C22—C23—H231 | 119.7 (19) |
N3—C4—H41 | 108.5 (15) | C23—C24—C25 | 120.6 (2) |
C5—C4—H41 | 113.2 (15) | C23—C24—Cl27 | 119.78 (17) |
N3—C4—H42 | 111.4 (15) | C25—C24—Cl27 | 119.62 (18) |
C5—C4—H42 | 112.2 (15) | C24—C25—C26 | 120.2 (2) |
H41—C4—H42 | 109 (2) | C24—C25—H251 | 120.1 (17) |
N1—C5—C4 | 104.26 (16) | C26—C25—H251 | 119.6 (17) |
N1—C5—H51 | 108.7 (16) | C25—C26—C21 | 120.0 (2) |
C4—C5—H51 | 112.1 (16) | C25—C26—H261 | 118.3 (18) |
N1—C5—H52 | 111.8 (14) | C21—C26—H261 | 121.7 (18) |
C4—C5—H52 | 109.6 (14) | C36—C31—C32 | 116.41 (19) |
H51—C5—H52 | 110 (2) | C36—C31—C12 | 123.18 (17) |
C2—N6—C7 | 115.03 (15) | C32—C31—C12 | 120.40 (18) |
O10—C7—N6 | 114.97 (15) | C33—C32—C31 | 122.6 (2) |
O10—C7—C8 | 119.37 (16) | C33—C32—Cl37 | 117.77 (19) |
N6—C7—C8 | 125.63 (16) | C31—C32—Cl37 | 119.65 (16) |
C7—C8—C9 | 117.90 (16) | C34—C33—C32 | 119.8 (2) |
C7—C8—C12 | 122.85 (17) | C34—C33—H331 | 122 (2) |
C9—C8—C12 | 119.12 (15) | C32—C33—H331 | 118 (2) |
O11—C9—N3 | 117.86 (16) | C33—C34—C35 | 119.5 (2) |
O11—C9—C8 | 127.47 (16) | C33—C34—H341 | 121 (2) |
N3—C9—C8 | 114.66 (15) | C35—C34—H341 | 120 (2) |
C7—O10—H101 | 113.1 (17) | C34—C35—C36 | 120.1 (3) |
C8—C12—C31 | 116.73 (16) | C34—C35—H351 | 122 (2) |
C8—C12—H121 | 108.5 (14) | C36—C35—H351 | 118 (2) |
C31—C12—H121 | 107.9 (14) | C31—C36—C35 | 121.7 (2) |
C8—C12—H122 | 109.0 (14) | C31—C36—H361 | 119.5 (19) |
C31—C12—H122 | 108.6 (14) | C35—C36—H361 | 118.8 (19) |
C21—N1—C2—N6 | −3.2 (3) | C7—C8—C12—C31 | 116.6 (2) |
C5—N1—C2—N6 | −175.39 (19) | C9—C8—C12—C31 | −67.8 (2) |
C21—N1—C2—N3 | 178.28 (17) | C2—N1—C21—C22 | −164.0 (2) |
C5—N1—C2—N3 | 6.0 (2) | C5—N1—C21—C22 | 7.5 (3) |
N6—C2—N3—C9 | −3.1 (3) | C2—N1—C21—C26 | 17.6 (3) |
N1—C2—N3—C9 | 175.46 (16) | C5—N1—C21—C26 | −171.0 (2) |
N6—C2—N3—C4 | −177.88 (19) | C26—C21—C22—C23 | −0.9 (3) |
N1—C2—N3—C4 | 0.7 (2) | N1—C21—C22—C23 | −179.4 (2) |
C2—N3—C4—C5 | −6.7 (2) | C21—C22—C23—C24 | 0.3 (4) |
C9—N3—C4—C5 | 178.73 (18) | C22—C23—C24—C25 | 0.6 (4) |
C2—N1—C5—C4 | −9.9 (2) | C22—C23—C24—Cl27 | 179.68 (18) |
C21—N1—C5—C4 | 177.28 (18) | C23—C24—C25—C26 | −0.9 (4) |
N3—C4—C5—N1 | 9.5 (2) | Cl27—C24—C25—C26 | 180.0 (2) |
N3—C2—N6—C7 | 0.4 (3) | C24—C25—C26—C21 | 0.4 (4) |
N1—C2—N6—C7 | −177.92 (18) | C22—C21—C26—C25 | 0.6 (3) |
C2—N6—C7—O10 | 179.17 (15) | N1—C21—C26—C25 | 179.0 (2) |
C2—N6—C7—C8 | 1.1 (3) | C8—C12—C31—C36 | −12.0 (3) |
O10—C7—C8—C9 | −178.03 (16) | C8—C12—C31—C32 | 167.16 (18) |
N6—C7—C8—C9 | −0.1 (3) | C36—C31—C32—C33 | 0.3 (3) |
O10—C7—C8—C12 | −2.3 (3) | C12—C31—C32—C33 | −178.9 (2) |
N6—C7—C8—C12 | 175.65 (17) | C36—C31—C32—Cl37 | −178.73 (17) |
C2—N3—C9—O11 | −175.20 (17) | C12—C31—C32—Cl37 | 2.1 (3) |
C4—N3—C9—O11 | −1.1 (3) | C31—C32—C33—C34 | 0.4 (4) |
C2—N3—C9—C8 | 3.9 (2) | Cl37—C32—C33—C34 | 179.5 (2) |
C4—N3—C9—C8 | 178.01 (19) | C32—C33—C34—C35 | −1.2 (4) |
C7—C8—C9—O11 | 176.67 (18) | C33—C34—C35—C36 | 1.2 (4) |
C12—C8—C9—O11 | 0.8 (3) | C32—C31—C36—C35 | −0.3 (3) |
C7—C8—C9—N3 | −2.4 (2) | C12—C31—C36—C35 | 178.9 (2) |
C12—C8—C9—N3 | −178.25 (16) | C34—C35—C36—C31 | −0.5 (4) |
D—H···A | D—H | H···A | D···A | D—H···A |
C12—H122···O10 | 0.97 (2) | 2.41 (2) | 2.848 (2) | 106.5 (17) |
C26—H261···N6 | 0.90 (2) | 2.36 (2) | 2.918 (3) | 120.3 (19) |
O10—H101···O11i | 0.85 (2) | 1.80 (2) | 2.6418 (18) | 172 (3) |
C33—H331···Cl27ii | 0.93 (4) | 2.81 (4) | 3.534 (2) | 135 (3) |
Symmetry codes: (i) x, −y+3/2, z−1/2; (ii) x−1, y, z+1. |
Experimental details
Crystal data | |
Chemical formula | C19H15Cl2N3O2 |
Mr | 388.24 |
Crystal system, space group | Monoclinic, P21/c |
Temperature (K) | 296 |
a, b, c (Å) | 11.4521 (3), 12.8287 (4), 11.7255 (3) |
β (°) | 96.283 (2) |
V (Å3) | 1712.31 (8) |
Z | 4 |
Radiation type | Cu Kα |
µ (mm−1) | 3.58 |
Crystal size (mm) | 0.26 × 0.25 × 0.11 |
Data collection | |
Diffractometer | Bruker APEXII CCD |
Absorption correction | Multi-scan (SADABS; Bruker, 2005) |
Tmin, Tmax | 0.415, 0.674 |
No. of measured, independent and observed [I > 2σ(I)] reflections | 12489, 3040, 2521 |
Rint | 0.042 |
(sin θ/λ)max (Å−1) | 0.600 |
Refinement | |
R[F2 > 2σ(F2)], wR(F2), S | 0.039, 0.112, 1.05 |
No. of reflections | 3040 |
No. of parameters | 280 |
H-atom treatment | All H-atom parameters refined |
Δρmax, Δρmin (e Å−3) | 0.28, −0.29 |
Computer programs: APEX2 (Bruker, 2005), SAINT (Bruker, 2005), SHELXS97 (Sheldrick, 2008), SHELXL97 (Sheldrick, 2008), ORTEP-3 (Farrugia, 1997), WinGX (Farrugia, 1999).
D—H···A | D—H | H···A | D···A | D—H···A |
C12—H122···O10 | 0.97 (2) | 2.41 (2) | 2.848 (2) | 106.5 (17) |
C26—H261···N6 | 0.90 (2) | 2.36 (2) | 2.918 (3) | 120.3 (19) |
O10—H101···O11i | 0.85 (2) | 1.80 (2) | 2.6418 (18) | 172 (3) |
C33—H331···Cl27ii | 0.93 (4) | 2.81 (4) | 3.534 (2) | 135 (3) |
Symmetry codes: (i) x, −y+3/2, z−1/2; (ii) x−1, y, z+1. |
References
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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.
Dioxo derivatives of fused imidazoline ring systems were found to have significant analgesic, opioid-like action but without typical narcotic analgesic side effects (Matosiuk, Fidecka, Antkiewicz-Michaluk, Dybała et al.., 2002; Matosiuk, Fidecka, Antkiewicz-Michaluk, Lipkowski et al., 2002). The X-ray analysis of the title compound, (I), was performed in order to confirm the synthesis pathway and identification of its tautomeric form in the solid state. The bond lengths, angles and planarity of the rings in the bicyclic imidazopyrimidine part of (I) are very similar to those observed in previously reported crystal structure of 6-(benzyl)-7-hydroxy-1-(2-methoxyphenyl)-2,3-dihydro-1H7H- imidazo[1,2-a]-pyrimidin-5-one (Wysocki et al. (2006). In the crystalline state, the molecule exists as 7-hydroxy-5-oxo tautomer, as evidenced by the C7—O10 [1.330 (2) Å], C9—O11 [1.242 (2) Å], C7—N6 [1.361 (2) Å], C2—N6 [1.305 (2) Å], C9—N3 [1.391 (2) Å] C2—N3 [1.358 (2) Å] bond lengths and the position of the H atom in the vicinity of O10 in difference electron-density map. The dihedral angles between the fused imidazopyrimidine and aromatic chlopophenyl and chlobobenzyl rings are 14.2 (1) and 70.7 (1)°, respectively. This conformation is influenced by the intramolecular C12—H122···O10 and C26—H261···N6 hydrogen bonds giving nearly co-planar five-ring fused system. In the crystal structure, strong intermolecular O10—H101···O11 resonance-assisted hydrogen bond (Gilli et al., 1989) links the molecules related by c-glide plane into chains along the c axis. Additionaly, molecules are joined in molecular chains parallel to [101] direction by a C33—H331···Cl27 hydrogen bond. Moreover, the guanidine π-electron system and phenyl ring, belonging to inversion-related molecules overlap with the shortest intermolecular contact C2···C23iii of 3.270 (3) and the angle between overlapping planes of 13.33 (11)° characteristic for π-π interactions [(iii) = 1 - x, 1 - y, 1 - z].