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Journal of the Chilean Chemical Society

versão On-line ISSN 0717-9707

J. Chil. Chem. Soc. vol.58 no.3 Concepción set. 2013 





1 Departamento de Química, Facultad de Ciencias, Universidad Católica del Norte, Av. Angamos 0610, Antofagasta, Chile. * e-mail:
Departamento de Química, Universidad de Antofagasta, Av.Angamos 601, Antofagasta, Chile
Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, 60438 Frankfurt/Main, Germany.
Departamento de Física, Universidad de Antofagasta, Av. Angamos 601, Antofagasta, Chile


In this work, 6-nitroquinazoline-2,4(1H,3H)-dione was obtained in two step with good yields using a facile synthetic method. Its structure was characterized by X-ray single crystal diffraction technique (XRD), IR, 1D-NMR (1H-NMR and 13C-NMR) and 2D-NMR (H-H COSY and H-C HMBC) spectroscopy. All N and O carbonyl atoms are involved in hydrogen bonding, with an average HˑˑˑO distance of 1.89(2) Å and N—HˑˑˑO angles in the range 169.5(2)-177.2(2)°. In the crystal packing the molecules are associated by two strong intermolecular N—H-O hydrogen bonds forming centrosymmetric ring with graph-set motif R22(8), which are linked by N—HˑˑˑO hydrogen bonds.



The quinazolinone nucleus and its derivatives have been extensively studied because of their wide range of pharmacological activities. As medicines, many of them display antifungal1, antimicrobial2, anti-HIV3, antitubercular4, anticancer5, antiinflammatory6, anticonvulsant7, antidepressant8, hypolipidemic9, antiulcer10, analgesic11 or immu-notropic activities12 and are also known to act as thymidyalate synthase13, poly(ADP-ribose) polymerase (PARP)14, and protein tyrosine kinase15 inhibitors. As pesticides, they are used as insecticides16 and fungicides17. In light of the growing number of applications in recent years there has been an enormous increase in the interest among biologists and chemists in their synthesis and bioactivity of quinazoline derivatives. Several methods of synthesis quinazolindiones have been reported such as, from 2-aminobenzonitrile with supercritical CO218, or by direct carbonylation of 2-aminobenzamide19 or starting from anthranilic acid with sodium cyanate, among others20. The structure has been confirmed by X-ray crystallography methods.


Synthesis of 2,4-(1H, 3H)-quinazolindione 3 (Scheme 1), was made it using the Lange y Sheible method20 modified, obtaining a better yield (92%) respect to reported (87%). The nitration was carried out using the procedure described by Mendenhall and Smith21 due they uses low temperatures and most favorable conditions for this type of reaction.

Scheme1. Reagents and reaction conditions in synthesis of 3.


The complete 1H and 13C NMR assignments of compounds 3, based on one- and two-dimensional NMR experiments (e.g. Figure 1a; gives the atom numbering), is shown in Table 1.

Figure 1: a) Numbering Scheme of 6-Nitro-2,4-(1H, 3H)-quinazolindione, b) H-H COSY and c) H-C HMBC principal correlations.


Table 1: 1H and 13C chemical shifts and 2D-NMR correlation data of compound 3.
In ppm from TMS; b H-H COSY and c H-C HMBC interactions.

COSY experiment (Fig. 1b) of 3, we can see the interactions between H1/H3 and H3/H4. HMBC spectrum shows correlations between C3/H1, C5/H1, C9/H1, C9/H3 and C10/H4.

The crystal structure was determined by single crystal X-ray diffraction. The title compound is planar (rms deviation 0.074Å), Figure 2. All N and O carbonyl atoms are involved in hydrogen bonding, with an average HˑˑˑO distance of 1.89(2) Å and N—HˑˑˑO angles in the range 169.5(2)-177.2(2)°, so in the crystal packing the molecules are associated by two strong intermolecular N—HˑˑˑO hydrogen bonds forming centrosymmetric ring with graph-set motif22 R22(8), which are linked by N—HˑˑˑO hydrogen bonds, Figure 3, Table 2. π-π stacking interactions are not observed. The bond length and angles are normal23.

Figure 2. View of the title compound, showing 50% probability displacement ellipsoids and atom-numbering scheme. H atoms are shown as small spheres of arbitrary radii.


Figure 3. A view of the part of the crystal structure of the title compound showing 50% probability displacement ellipsoids illustrating the N—HˑˑˑO interactions. Dashed lines indicate hydrogen bonds. Symmetry codes: (ii) -x, -y+2, -z+1; (i) x, -y+3/2, z+1/2.


Table 2. Hydrogen-bond geometry (A, °).
Symmetry codes: (ii) -x, -y+2, -z+1; (i) x, -y+3/2, z+1/2.


Melting points were determined on a Kofler-type apparatus and are uncorrected. The IR were taken on a Perkin-Elmer 200 spectrophotometer with KBr. NMR spectra were collected in DMSO-d6 or CDCl3 on a Varian Unity Inova 500 MHz spectrometer equipped with a microflow probe from Protasis. Mass spectra were recorded on a Micromass-LCT Premier Time-of-Flight electrospray (ESI) spectrometer with interface system Acquity UPLC (Ultra Performance Liquid Chromatography). TLC was performed on Al Si gel Merck 60 F254 and TLC plates were visualized by spraying with phosphomolybdic acid reagent and heating. Commercially available, laboratory grade reagents were used without further purification.

General Procedure

Synthesis of quinazoline-2,4(1H,3H)-dione, 2

A solution containing 20 g (146 mmol) of anthranilic acid 1 in 0.71 of water and 11 mL (190 mmol) of acetic acid was heated at 35 °C by 30 minutes. While the mixture is maintained stirring, a solution of 12 g (185 mmol) of sodium cyanate in 100 mL of water is dropwise slowly added and allowed to react for 30 minutes. After this time, the mixture was cooled on ice bath and after, 200 g (5 moles) of NaOH in small pieces were added slowly and stirring continued for 12 hours. The precipitate was washed in 1L of water and neutralized with aqueous sulfuric acid (1:1) until pH 7 and filtered under vacuum. The crude product, 21 g (yield 92%) was crystallized in water giving colorless crystals (m.p. 350-351°C).

Spectroscopic data:

IR (cm-1) 3254 (N-H), 3055 (Csp2-H), 1702 (C=O), 1506 (CAr-CAr).

1H-NMR (DMSO-d6, 500 MHz) (ppm): 7.16 (1H, m, H4), 7.62 (1H, t, J=7.7, H1), 7.88 (1H, d, J=7.4, H3), 11.09 (1H, s, H6), 11.22 (1H, s, H8).

13C-NMR (DMSO-d6, 125.70 MHz) (ppm): 114.32 (C10), 115.28 (C2), 122.26 (C4), 126.91 (C1), 134.87 (C3), 140.83 (C5), 150.26 (C7), 162.79 (C9).

HRESIMS: m/z 163.0497 for C8H7N2O2 [M+H]+, calculated: m/z 163.0508.

Synthesis of 6-Nitroquinazoline-2,4(1H,3H)-dione. 3

On an ice bath, 2 g (12,3 mmol) of quinazoline-2,4(1H,3H)-dione 2, were dissolved in 19 mL of sulfuric acid. Maintaining the mixture under agitation, a solution of 0.68 mL of nitric acid (12.3 mmol) and 1.37 mL of sulfuric acid were by dropwise added during 30 minutes and left reacting for 3 hours at 0°C. After this time, the reaction mixture was poured into a beaker containing 70 ml cold water. Subsequently, 70 ml of solution 9.5N of NaOH was dropwise added. The resulting precipitate was filtered at vacuum, dried and purified by chromatographic column using petroleum-ether/ethylacetate (3/7) as eluent. This gave 2.1 g (82% yield) of a yellow product.

Spectroscopic Data:

IR (cm-1) 3338 (N-H), 3018 (Csp2-H), 1683 (C=O), 1533 (CAr-NO2).

1H-NMR (DMSO-d6, 500 MHz) (ppm): 7.32 (1H, d, J= 9, H4), 8.45 (1H, dd, J= 9, H3), 8.59 (1H, d, J=6.6, H1), 11.69 (1H, s, H6), 11.74 (1H, s, H8).

13C-NMR (DMSO-d6, 125.70 MHz) (ppm): 114.51 (C10), 116.64 (C4), 123.06 (C1), 141.84 (C2), 145.61 (C5), 149.93 (C7), 161.57 (C9).

HRESIMS: m/z 206.0193 for C8H4N3O4 [M-H]+, calculated: m/z 206.0202.

X- Ray Crystallography

Single crystal analysis data were collected on a Stoe IPDS-II two-circle Diffractometer with MoKa radiation. Data collection: X-AREA24; cell refinement X-AREA24; data reduction: X-AREA24. Program used to solve structure program(s) used to refine structure: SHELXL9725; molecular graphics: XP in SHELXTL-Plus25 & OLEX226, software used to prepare material for publication: SHELXL9725. Crystal dimension of C8H5N3O4, 0.37x 0.35x0.12 mm3; Mr = 207.15 Dalton; Monoclinic P21/c; a = 10.9071(8) Å; b = 6.5758(6) Å; c = 12.4614(9) Å; α = 90°; β = 112.382(5)°; γ = 90.0°; V = 826.44(11) Å3; Z = 4; m = 0.137 mm-1; T = 173(2) K; absorption correction Semi-empirical from equivalents 27-28; max. and min. transmission 0.9837 and 0.9509. 8995/1898 measured/unique reflection with I>2s(I) [Rint = 0.0556]; R[I>2s(I)] 0.0393, wR2 = 0.1093; S = 1.097; 144 parameters; Drmax= 0.284 eÅ-3and Drmin= -0.209 eA-3. H1 and H2 atoms were freely refined; all H atoms were located in difference maps and their positions and isotropic displacements parameters of 1.2 times those of the attached atoms. Supplementary information: Crystallographic data (excluding structure factors) for the structural analysis have been deposited in the Cambridge Crystallographic Data Centre, CCDC 927348. These data can be obtained free of charge from the Cambridge Crystallographic Data Centre; Postal Address : CCDC, 12 Union Road , Cambridge CB21EZ, UK, Telephone: (44) 01223 762910, Fax: (44) 01223 336033, e-mail:



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(Received: March 14, 2013 - Accepted: May 7, 2013)

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