Startseite Naturwissenschaften The crystal structure of ethyl 2-methyl-5-oxo-4-(2-methoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, C20H23N2O4
Artikel Open Access

The crystal structure of ethyl 2-methyl-5-oxo-4-(2-methoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, C20H23N2O4

  • Di Fan , Zhiheng Li , Na Xu und Shoude Jin ORCID logo EMAIL logo
Veröffentlicht/Copyright: 31. Juli 2025

Abstract

C20H23N2O4, triclinic, P 1 (no. 2), a = 7.519(5) Å, b = 9.445(7) Å, c = 13.385(10) Å, α = 80.837(11)°, β = 82.430(12)°, γ = 69.438(11)°, V = 875.8(11) Å3, Z = 2, Rgt (F) = 0.0445, wRref (F2) = 0.1382, T = 296(1) K.

CCDC no.: 2475884

The molecular structure is shown in the figure. Table 1 contains the crystallographic data and the list of the atoms including atomic coordinates and displacement parameters can be found in the cif-file attached to this article.

Table 1:

Data collection and handling.

Crystal: Colorless block
Size: 0.29 × 0.24 × 0.21 mm
Wavelength:

μ:
Mo Kα radiation (0.71073 Å)

0.09 mm−1
Diffractometer, scan mode:

θmax, completeness:
Bruker APEX-II, φ and ω scans

25.2°, 99 %
N(hkl)measured, N(hkl)unique, Rint: 4,498, 3,113, 0.014
Criterion for Iobs, N(hkl)gt: Iobs > 2 σ(Iobs), 2,534
N(param)refined: 229
Programs: Bruker, 1 Olex2, 2 SHELX 3 , 4

1 Source of materials

All reagents were purchased from commercial reagent companies and used directly without further purification. The title compound was prepared by a modified literature method with minor optimizations. 5 A solution containing 2-methoxybenzaldehyde (0.272 g, 2 mmol), cyclohexane-1,3-dione (0.224 g, 2 mmol), ammonium acetate (0.154 g, 20 mmol), and ethyl acetoacetate (0.260 g, 2 mmol) in ethanol (50 mL) was refluxed for 5 h followed by ambient temperature cooling. Slow solvent evaporation at room temperature afforded colorless crystalline product, achieving a 65.3 % isolated yield based on 2-methoxybenzaldehyde.

2 Experimental details

The structure was solved by Direct Methods with the SHELXS-2018 program. All H-atoms from C and N atoms were positioned with idealized geometry and refined isotropically (Uiso (H) = 1.2 Ueq(C) or Ueq(N)) using a riding model with C–H = 0.930, 0.960, 0.970 and 0.980 Å, and C–H = 0860 Å, respectively.

3 Comment

To date, some ethyl 2-methyl-5-oxo-4-(aryl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate based 4-arylpolyhydroquinoline derivatives have been reported for their biological activity, including ethyl 2-methyl-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, 5 ethyl 2-methyl-4-(1-naphthyl)-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, 6 ethyl 2-methyl-5-oxo-4-phenyl-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, 7 ethyl 2-methyl-5-oxo-4-(2,3,4-trimethoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, 8 ethyl 2-methyl-4-(2-methylphenyl)-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, 9 and ethyl 2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate. 10 Herein we reported the crystal structure of the title compound, ethyl 2-methyl-5-oxo-4-(2-methoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, C20H23N2O4.

The asymmetric unit contains only one molecule of the title compound. The adjacent ketone ring adopts a flattened chair conformation with the aryl group and the six-membered nitrogen heterocyclic ring are nearly planar, respectively. A one-dimensional chain structure is formed by connecting a classical hydrogen bond N1–H1⋯O3 and a non-classical hydrogen bond C10–H10A⋯O3. All bond lengths are normal and consistent with similar structures reported in the literature. 5 , 6 , 7 , 8 , 9 , 10 , 11


Corresponding author: Shoude Jin, Respiratory and Critical Care Medicine Ward 2, Harbin Medical University Affiliated Fourth Hospital, Harbin 150001, China, E-mail:

References

1. Bruker, SAINT v7.60A; Bruker AXS Inc: Madison, Wisconsin, USA, 2009.Suche in Google Scholar

2. Dolomanov, O. V.; Bourhis, L. J.; Gildea, R. J.; Howard, J. A. K.; Puschmann, H. Olex2: a Complete Structure Solution, Refinement and Analysis Program. J. Appl. Crystallogr. 2009, 42, 339–341; https://doi.org/10.1107/s0021889808042726.Suche in Google Scholar

3. Sheldrick, G. M. Crystal Structure Refinement with Shelxl. Acta Crystallogr. 2015, C71, 3–8; https://doi.org/10.1107/s2053229614024218.Suche in Google Scholar

4. Sheldrick, G. Using Phases to Determine the Space Group. Acta Crystallogr. 2018, A74, A353; https://doi.org/10.1107/s0108767318096472.Suche in Google Scholar

5. Meng, J.; Dai, Y.; Sui, F. Crystal Structure of 4-(3,4-dimethyl-phenyl)-2-methyl-5-oxo-1,4,5,6,7,8-hexahydro-quinoline-3-carboxylic Acid Ethyl Ester, C21H25NO3. Z. Kristallogr. – N. Cryst. Struct. 2017, 232, 111–112; https://doi.org/10.1515/ncrs-2016-0173.Suche in Google Scholar

6. Kidwai, M.; Chauhan, R.; Bhatnagar, D.; Singh, A. K.; Mishra, B.; Dey, S. Nafion-H-catalyzed Synthesis of Polyhydroquinolines via the Hantzsch Multicomponent Reaction. Monatsh. Chem. 2012, 143, 1675–1680; https://doi.org/10.1007/s00706-012-0742-4.Suche in Google Scholar

7. Huang, H.; Zhao, Y.-L.; Wei, H.; Wei, P.-F.; Liu, J.-P. Synthesis of 4-arylpolyhydroquinoline Derivatives and Evaluation of their Antitumor Activities. Chin. J. Struct. Chem. 2016, 35, 1553–1557.Suche in Google Scholar

8. Bhaskaruni, S. V. H. S.; Maddila, S.; van Zyl, W. E.; Jonnalagadda, S. B. Four-Component Fusion Protocol with NiO/ZrO2 as a Robust Recyclable Catalyst for Novel 1,4-dihydropyridines. ACS Omega 2019, 4, 21187–21196; https://doi.org/10.1021/acsomega.9b02608.Suche in Google Scholar PubMed PubMed Central

9. Natarajan, S.; Indumathi, P.; Reddy, B. P.; Vijayakumar, V.; Lakshman, P. L. N. Ethyl 2-methyl-5-oxo-4-(3,4,5-trimethoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate. Acta Crystallogr. E. 2010, 66, o2240; https://doi.org/10.1107/s1600536810030333.Suche in Google Scholar

10. Wang, X.-K.; Li, P.-W.; Yan, B.; Wang, B.-J. 1,4-Dihydropyridine Derivatives: Synthesis and Anti-hepatoma Cancer Activity. Lat. Am. J. Pharm. 2016, 35, 1692–1695.10.15199/62.2017.4.34Suche in Google Scholar

11. Ma, J.; Dai, W.; Feng, W.; Lin, T.; Zhou, L.; Qin, W.; Wang, X. Crystal Structure of Methyl 2-methyl-4-(3-methoxyphenyl)-5-oxo-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, C19H21NO4. Z. Kristallogr. – N. Cryst. Struct. 2018, 233, 945; https://doi.org/10.1515/ncrs-2018-0130.Suche in Google Scholar

Received: 2025-06-22
Accepted: 2025-07-25
Published Online: 2025-07-31
Published in Print: 2025-10-27

© 2025 the author(s), published by De Gruyter, Berlin/Boston

This work is licensed under the Creative Commons Attribution 4.0 International License.

Artikel in diesem Heft

  1. Frontmatter
  2. New Crystal Structures
  3. Crystal structure of (S)-N-(10-((2,2-dimethoxyethyl)amino)-1,2,3-trimethoxy-9-oxo-5,6,7,9-tetrahydrobenzo[a]heptalen-7-yl)acetamide, C25H32N2O7
  4. The crystal structure of 6,6′-difluoro-3,3′-dimethyl-5,5′-di(10H-phenoxazin-10-yl)- [1,1′-biphenyl]-2,2′-dicarbonitrile, C40H24F2N4O2
  5. Crystal structure of poly[(di-ethylenediamine-κ2N,N′)cadmium(II) tetradedocyloxidohexavanadate] (V4+/V5+ = 2/1), C4H16CdN4O14V6
  6. The crystal structure of poly[bis(dimethylformamide-κ1N)-(μ4-2′,3,3″,5′-tetrakis(trifluoromethyl)-[1,1′:4′,1″-terphenyl]-4,4″-dicarboxylato-κ4 O,O′: O″,O‴)dicadmium(II)], C27H15CdF12NO5
  7. Crystal structure of bis(μ2-ferrocenylcarboxylato-O,O′)-(μ3-oxido-κ3O:O:O)-bis(μ2-salicyladoximato-κ2N,O,O′)-(μ2-isopropoxo)-tris(isopropoxy-κ1O trititanium(IV)), C48H55N2O13Fe2Ti3
  8. Crystal structure of 3-(diethylamino)-7,9,11-trimethyl-8-phenyl-6H,13H-12λ4,13λ4-chromeno[3′,4′:4,5]pyrrolo[1,2-c]pyrrolo[2,1-f][1,3,2]diazaborinin-6-one, C28H26BF2N3O2
  9. The crystal structure of catena-poly[aqua-μ2-2-nitro-benzene-1,3-dicarboxylato-κ2O,O′)-(1,10-phenanthroline-κ2N,N′)-zinc(II)], C20H13N3O7Zn
  10. Crystal structure of poly[diaqua-{μ3-1-(3-carboxylatophenyl)-4-oxo-1,4-dihydropyridazine-3-carboxylato-κ4O,O′:O′′:O′′′′}manganese(II)] hydrate
  11. Crystal structure of N′-((1-hydroxycyclohexyl)(phenyl)methyl)-2-methoxybenzohydrazide methanol solvate, C22H28N2O4
  12. The cocrystal of caffeic acid — progesterone — water (1/2/1), C51H70O9
  13. Crystal structure of (((oxido(quinolin-6-yl)methoxy)triphenyl-λ5-stibanyl)oxy)(quinolin-7-yl)methanolate
  14. Crystal structure of [(E)-6′-(diethylamino)-2-(2-(((E)-pyren-1-ylmethylene)amino)ethyl)-4′-(2-((E)-1,3,3-trimethylindolin-2-ylidene)ethylidene)-1′,2′,3′,4′-tetrahydrospiro[isoindoline-1,9′-xanthen]-3-one]-methanol, solvate C57H56N4O3
  15. The crystal structure of 1-(acridin-9-yl)pyrrolidine-2,5-dione, C17H22N2O2
  16. Crystal structure of N-(4-acetylphenyl)-2-(6-methoxynaphthalen-2-yl)propanamide, C22H21NO3
  17. The crystal structure of 5,10,15,20-tetrakis(4-(1H-1,2,4-triazol-1-yl)phenyl)porphyrin, C52H34N16
  18. Crystal structure of hexacarbonyl-μ2-[phenylmethanedithiolato-κ4S:S,S′:S′]diiron (Fe–Fe) C13H6Fe2O6S2
  19. Crystal structure of diiodo-bis(1-((2-propyl-1H-benzo[d]imidazol-1-yl)methyl)-1H-benzo[d][1,2,3]triazole-κ1N)cadmium(II), C34H34CdI2N10
  20. Crystal structure of (E)-(3-(3-bromophenyl)acryloyl)ferrocene, C19H15BrFeO
  21. Crystal structure of catena-poly(μ2-6-chloropyridine-2-carboxylato-κ3N,O:O′)(6-chloropyridine-2-carboxylato-κ2O,N)copper(II), C12H6Cl2N2O4Cu
  22. Crystal structure of poly[diaqua-μ 3-(5-(3,5-dicarboxy-2,4,6-trimethylbenzyl)-2,4,6-trimethylisophthalato)-κ 6O,O′:O″,O‴:O‴′,O‴″) terbium(III)-monohydrate], C23H28TbO12
  23. Crystal structure of (E)-2-(((5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)methylene)amino)-3′,6′-dihydroxyspiro[isoindoline-1,9′-xanthen]-3-one – ethanol (1/2), C35H33ClN4O6
  24. The crystal structure of 3-(5-amino-3-phenylisoxazol-4-yl)-4-chloro-3-hydroxyindolin-2-one, C17H12ClN3O3
  25. The crystal structure of dimethylammonium 4-[2-(4-fluorophenyl)-4, 5-diphenyl-1H-imidazol-1-yl]benzenesulfonate, C29H26FN3O3S
  26. Crystal structure of (R)-2-ammonio-3-((5-carboxypentyl)thio)propanoate
  27. Crystal structure of 4-cyclohexyl-5-(thiophen-2-yl)-2,4-dihydro-3H-1,2,4-triazole-3-thione, C12H15N3S2
  28. The crystal structure of 4,6-bis(dimethylamino)-2-fluoroisophthalonitrile, C12H13FN4
  29. Hydrogen bonding in the crystal structure of nicotin-1,1′-dium tetrabromidomanganate(II)
  30. The crystal structure of bis(2-bromobenzyl)(2-((2-oxybenzylidene)amino)-4-methylpentanoato-κ3N, O,O′)tin(IV), C27H27Br2NO3Sn
  31. Crystal structure of (E)-(3-(p-tolyl)acryloyl)ferrocene, C20H18FeO
  32. Crystal structure of (E)-7-fluoro-2-((5-(4-methylpiperazin-1-yl)pyridin-2-yl)methylene)-3,4-dihydronaphthalen-1(2H)-one, C21H22FN3O
  33. Crystal structure of (E)-7-methoxy-2-((5-(4-methylpiperazin-1-yl)pyridin-2-yl)methylene)-3,4-dihydronaphthalen-1(2H)-one, C22H25N3O2
  34. The crystal structure of poly(bis(μ2-1,3,5-tri(1H-imidazol-1-yl)benzene-κ2N:N′)-(μ2-2,3,5,6-tetrafluoroterephthalato-κ2O:O′)-manganese(II), C38H24F4N12O4Mn
  35. Crystal structure of (3,4-dimethoxybenzyl)triphenylphosphonium bromide ethanol solvate, C29H32BrO3P
  36. Crystal structure of tetraethylammonium hydrogencarbonate – (diaminomethylene)thiourea – water (2/1/3)
  37. Crystal structure of N, N-Dimethyl-N′-tosylformimidamide, C10H14N2O2S
  38. The crystal structure of ethyl 2-methyl-5-oxo-4-(2-methoxyphenyl)-1,4,5,6,7,8-hexahydroquinoline-3-carboxylate, C20H23N2O4
  39. Crystal structure of bis(μ2-1,5-bis[(E)-1-(2-hydroxyphenyl)ethylidene] thiocarbonohydrazide)-bis(dimethylformamide)-dizinc(II) dimethylformamide solvate, C40H46N10O6S2Zn2⋅C3H7NO
  40. Crystal structure of azido-κ1N{hydridotris(3-tert-butyl-5-methylpyrazol-1-yl)borato-κ3N,N′,N″}copper(II), C24H40BCuN9
  41. The crystal structure of fac-tricarbonyl(1,10-phenanthroline-κ2N,N′)-(azido-κ1N)rhenium(I), C15H8N5O3Re
  42. Crystal structure of 4-((triphenylphosphonio)methyl)pyridin-1-ium tetrachloridozincate(II), C24H22Cl4NPZn
Heruntergeladen am 31.1.2026 von https://www.degruyterbrill.com/document/doi/10.1515/ncrs-2025-0281/html?lang=de
Button zum nach oben scrollen