Journal of Pharmaceutics

Volume 2013 (2013), Article ID 907525, 7 pages

http://dx.doi.org/10.1155/2013/907525

Research Article

Synthesis, Characterization, and Anti-Inflammatory Activity of Newer Quinazolinone Analogs

Chatrasal Singh Rajput1,2 and Shiwani Singhal¹

¹Medicinal Chemistry Division, Department of Pharmacology, L.L.R.M. Medical College, Meerut 250002, India

²Jubilant Chemsys Ltd. R & D B-34, Sector 58, Noida 201301, India

Received 24 September 2012; Revised 29 October 2012; Accepted 1 November 2012

Academic Editor: Susana Zacchino

Copyright © 2013 Chatrasal Singh Rajput and Shiwani Singhal. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract.

A series of 3-[-(Substitutedbenzylideneamino)phenyl]-2-methyl-6-substituted quinazolin-4-ones (5–10), 3-[-(-chloro--oxo--substitutedphenylazetidin--yl)phenyl]-2-methyl-6-substitutedquinazolin-4-ones (11–16), and 3-[-(-substitutedphenyl--oxo-,-thiazolidin--yl)phentl]-2-methyl-6-substitutedquinazolin-4-ones (17–22) have been synthesized in the present study. The structures of the synthesized compounds were assigned on the basis of elemental analysis, IR, NMR, and mass spectral data. All the newly synthesized compounds were screened for anti-inflammatory and analgesic activities.

1. Introduction

Quinazolinone derivatives represent one of the most active classes of compounds possessing a wide spectrum of biological activity. They are widely used in pharmaceuticals and agrochemicals. Several reports have been published on the biological activities of quinazolinone derivatives, including their anti-inflammatory [1–7], antimalarial [8, 9], antimicrobial, anti-fungal, antibacterial [10–16], anticonvulsant [17–20], and antitumor [21, 22] activities. Moreover, large number of quinazolinone derivatives having substitution at 2 and 3 position by different heterocyclic moieties increases anti-inflammatory potential of quinazolinone derivatives. Similarly, various azetidinones [23–25] and thiazolidinones [26, 27] have been reported to possess potent anti-inflammatory activity. Looking to the medicinal importance of 4(3H)-quinazolinone, 4-thiazolidinone, and azetidinones, we report here the synthesis of a new class of heterocyclic molecules in which all of these moieties are present and try to develop potential bioactive molecules. The structures of the compounds synthesized were assigned on the basis of elemental analysis, IR, ¹H NMR, and Mass spectral data. These compounds were evaluated for their anti-inflammatory and analgesic activities.

2. Materials and Methods

2.1. Chemistry

The synthetic routes of compounds are outlined in Scheme 1. As shown in Scheme 1, compounds 2-methylsubstitued-4H-3,1-benzoxazin-4-ones (1,2) were synthesized by the known procedure of Bogert [28]. Substituted anthranilic acid reacted with acetic anhydride to give 2-methylsubstituted-4H-3,1-benzoxazin-4-ones (1,2), which further reacted with 2-amino phenyl amine in acetic acid to yield 3-(2′-aminophenyl)-2-methyl-6-substituted quinazolin-4-ones (3,4). Compounds (3,4) when treated with different substituted aromatic aldehydes formed various substituted arylidene derivatives (5–10). These arylidene derivatives on treatment with chloroacetylchloride in presence of triethylamine yielded 3-[2′-(3′′-chloro-2′′-oxo-4′′-substituted phenylazetidin-1′′-yl)phenyl]-2-methyl-6-substitutedquinazolin-4-ones (11–16). On the other hand, these arylidene derivatives on reaction with thioglycolic acid and anhydrous ZnCl₂ furnished 3-[2′-(2′′-substitutedphenyl-4′′-oxo-1′′,3′′-thiazolidin-3′′-yl)phenyl]-2-methyl-6-substitutedquinazolin-4-ones. (17–22). The structures of the compounds synthesized were assigned on the basis of elemental analysis, IR, ¹H NMR, and Mass spectral data.

Scheme 1

2.2. Methods

2.2.1. Biological Activity

The experiments were performed with albino rats of the Charles-foster stain of either sex, excluding pregnant females, of 70–95 d. weighting 100–150 g. Food (chaw pallet) and water were given to the animals ad libitum. All the compounds were dissolved in propylene glycol. Phenylbutazone was used as reference drug.

Anti-Inflammatory Activity against Carrageenan-Induced Rat’s Paw Oedema

This study was done with the procedure of Winter et al. [29]. The rats were divided into three groups (control, treated, and standard drug) of six animals each. A freshly prepared suspension of carrageenan (1% in 0.9% saline) 0.05 mn was injected under the planter aponeurosis of the right hind paw of each rat. Test compounds and standard drug were administered orally to the animals of drug-treated groups and the standard drug group, respectively, 1 h before the carrageenan injection. The paw volume of each rat was measured before 1 and after 3 h of carrageenan treatment with the help of a plethysmometer. The percent anti-inflammatory activity was calculated according to the formula given below

where and are the mean increase in paw volume of rats of the treated and the control group, respectively. Results were statistically analyzed.

Analgesic Activity

This activity was assessed following the method of Berkowitz et al. [30]. This method is based on the property of the test compound to antagonize the phenyl quinone-induced pain syndrome in mice. Groups of five mice were injected intraperitoneally with 0.25 mL of a 0.02% solution of phenylquinone in ethanol (5%) 1 h after of oral administration of the test compound. The number of writhes induced in each mouse was counted for 5 min (between 5 and 10 min) after injection of an irritant. The analgesic effect was expressed as percent protection in comparison to control.

2.2.2. Experimental

Melting points were determined in one-end-open capillary tube on Thomas Hoover melting apparatus and are uncorrected. The purities of compounds were checked by thin layer chromatography (TLC) using silica gel-G coated plats. The spots were developed in an iodine chamber and visualized under ultraviolet (UV) lamp. Infrared (IR) absorption spectra were recorded on Perkin-Elmer RX-1 FTIR spectrometer using potassium bromide (KBr) pellet, and wave numbers were given in cm⁻¹. The ¹H NMR spectra were recorded in CDCl₃ on a Bruker Avance II 400 NMR spectrometer (400 MHz). The ¹³C NMR spectra were recorded in CDCl₃ on a Bruker Avance II 400 NMR spectrometer operating at 100 MHz. The chemical shifts are reported in part per million (δ ppm) using trimethylsilane (TMS) as an internal standard. Elemental analysis (C, H, N) was performed on Perkin-Elmer 2400 analyzer, and values were either in ±0.4% of the calculated.

3-(2′-Aminophenyl)-2-Methyl-Quinazolin-4-one ( 3 )

A mixture of 2-methyl-4H-3,1-benzoxazin-4-one (1) (0.01 mole) with 2-aminophenylamine (0.01 mole) in acetic acid (40 mL) was refluxed for 7 hr. in the presence of sodium acetate. The solvent was removed under reduced pressure. The solid thus obtained was filtered off and recrystallized from toluene to give compound 3 (78%). m.p. 99°C. IR (KBr) in cm⁻¹: 3033 (CH aromatic), 2920 (CH aliphatic), 1690 (C=O), 1595 (C=N); ¹HNMR (CDCl₃) δ in ppm: 9.10 (s, 2H, NH₂ exchangeable), 6.89–7.61 (m, 8H, Ar–H), 2.29 (s, 3H, CH₃); Anal. Calcd. for C₁₅H₁₃N₃O: C, 71.71; H, 5.18; N, 16.73: Found: C, 71.85; H, 5.20; N, 16.68: MS [M]⁺ at m/z 251.

The following compound was prepared using a similar procedure described for compound 3.

3-( -Aminophenyl)-2-Methyl-6-Bromoquinazolin-4-one ( 4 )

(75%) (Benzene) m.p. 199°C, IR (KBr) in cm⁻¹: 3030 (CH aromatic), 2925 (CH aliphatic), 1695 (C=O), 1598 (C=N); ¹H NMR (CDCl₃) δ in ppm: 9.06 (s, 2H, NH₂ exchangeable), 6.85–7.51 (m, 7H, Ar–H), 2.24 (s, 3H, CH₃); Anal. Calcd. for C₁₅H₁₂N₃OBr: C, 54.55; H, 3.64; N, 12.73: Found: C, 54.38; H, 3.65; N, 12.76: MS [M]⁺ at m/z 330.

3-[ 2′-(Benzylideneamino)Phenyl]-2-Methyl-Quinazolin-4-one ( 5 )

A solution of compound 3 (0.01 moles) in ethanol (55 mL) was refluxed with benzaldehyde (0.01 moles) separately in the presence of glacial acetic acid (2.5 mL) for 11 hr. The reaction mixture was concentrated, cooled, and then poured into ice water. The separated solid was filtered and recrystallized from methanol to give compound 29 (63%) m.p. 118°C: IR (KBr) in cm⁻¹: 3028 (CH aromatic), 2930CH aliphatic), 1705 (C=O), 1610 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.79–7.63 (m, 13H, Ar–H), 6.35 (s, 1H, N=CH), 2.21 (s, 3H, CH₃); Anal. Caled. for C₂₂H₁₇N₃O: C, 77.88; H, 5.01; N, 12.39: Found: C, 77.96; H, 5.00; N, 12.41: MS [M]⁺ at m/z. 339.

The following compounds were prepared using a similar procedure described for compound 5.

3-[2′-(p-Chlorobenzylideneamino)Phenyl]-2-Methyl-Quinazolin-4-one ( 6 )

(65%). (Benzene) m.p. 134°C: IR (KBr) in cm⁻¹: 3028 (CH aromatic), 2929 (CH aliphatic), 1705 (C=O), 1598 (C=N) 788 (C–Cl); ¹H NMR (CDCl₃) δ in ppm: 6.82–7.65 (m, 12H, Ar–H), 6.38 (s, 1H, N=CH), 2.24 (s, 3H, CH₃); Anal. Caled. for C₂₂H₁₆N₃OCl: C,70.68; H, 4.28; N, 11.24: Found: C, 70.79; H, 4.27; N, 11.26: MS [M]⁺ at m/z. 373.5.

3-[2′-(p-Methoxybenzylideneamino)Phenyl]-2-Methyl-Quinazolin-4-one ( 7 )

(60%). (Methanol) m.p. 148°C: IR (KBr) in cm⁻¹: 3035(CH aromatic), 2932 (CH aliphatic), 1700 (C=O), 1600 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.80–7.61 (m, 12H, Ar–H), 6.40 (s, 1H, N=CH), 3.48 (s, 3H, OCH₃) 2.26 (s, 3H, CH₃); Anal. Caled. for C₂₃H₁₉N₃O₂: C, 74.80; H, 5.15; N, 11.38: Found: C, 74.96; H, 5.17; N, 11.29: MS [M]⁺ at m/z. 369.

3-[ 2′-(Benzylideneamino)Phenyl]-2-Methyl-6-Bromoquinazolin-4-one ( 8 )

(64%). (Ethanol) m.p. 215°C: IR (KBr) in cm⁻¹: 3033 (CH aromatic), 2926 (CH aliphatic), 1698 (C=O), 1606 (C=N); ¹H NMR (CDCl₃) δ in ppm: 6.83–7.60 (m, 12H, Ar–H), 6.43 (s, 1H, N=CH), 2.22 (s, 3H, CH₃); Anal. Caled. for C₂₂H₁₆N₃OBr: C,63.16; H, 3.83; N, 10.05: Found: C, 63.29; H, 3.82; N, 10.07: MS [M]⁺ at m/z. 418.

3-[ 2′-(p-Chlorobenzylideneamino)Phenyl]-2-Methyl-6-Bromoquinazolin-4-one ( 9 )

(65%). (Ethanol) m.p. 234°C: IR (KBr) in cm⁻¹: 3030 (CH aromatic), 2930 (CH aliphatic), 1695 (C=O), 1601 (C=N), 785 (C–Cl); ¹HNMR (CDCl₃) δ in ppm: 6.81–7.59 (m, 11H, Ar–H), 6.41 (s, 1H, N=CH), 2.25 (s, 3H, CH₃); Anal. Caled. for C₂₂H₁₅N₃OBrCl: C, 58.34; H, 3.31; N, 9.28: Found: C, 58.55; H, 3.32; N, 9.30: MS [M]⁺ at m/z. 452.5.

3-[2′-(p-Methoxybenzylideneamino)Phenyl]-2-Methyl-6-Bromoquinazolin-4-one ( 10 )

(60%). (Acetone) m.p. 223°C: IR (KBr) in cm⁻¹: 3033 (CH aromatic), 2926 (CH aliphatic), 1698 (C=O), 1595 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.83–7.61 (m, 11H, Ar–H), 6.44 (s, 1H, N=CH), 3.44 (s, 3H, OCH₃) 2.25 (s, 3H, CH₃); Anal. Caled. for C₂₃H₁₈N₃O₂Br: C, 61.61; H, 4.02; N, 9.38: Found: C, 61.52; H, 4.01; N, 9.36: MS [M]⁺ at m/z. 448

3-[2′-( -Chloro- -Oxo- -Phenylazetidin- -Yl)-Phenyl]-2-Methyl-Quinazol-In-4-one ( 11 )

To a solution of compound 5 (0.01 mole) and triethylamine (0.5 mL) in ethanol (55 mL) was added in monochloroacetylchloride (0.014 mole) at 50°C. The reaction mixture was stirred for 45 min. at room temperature and refluxed for 8 hr. The reaction mixture was filtered to removed triethylamine hydrogen chloride and the resultant solution was poured onto crushed ice with constant stirring. The solid thus obtained was recrystallized from acetone to give desired compound 11 (60%) m.p. 153°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3030 (CH aromatic), 2925 (CH aliphatic), 1700 (C=O), 1595 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.81–7.98 (m, 13H, Ar–H), 6.51 (d,1H, J = 9.0 Hz, CH–Cl), 4.60 (d, 1H, J = 9.3 Hz, N–CH–Ar), 2.21 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₈N₃O₂Cl: C, 69.31; H, 4.33; N, 10.11: Found: C, 69.47; H, 4.32; N, 10.14: MS [M]+ at m/z 415.5.

The following compounds were prepared using a similar procedure described for compound 11.

3-[2′-( -Chloro- -Oxo- -(p-Chlorophenyl)Azetidin- -yl)-Phenyl]-2-Methyl Quinazolin-4-one ( 12 )

(58%) (Methanol) m.p. 198°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3033 (CH aromatic), 2928 (CH aliphatic), 1705 (C=O), 1591 (C=N), 788 (C–Cl); ¹HNMR (CDCl₃) δ in ppm: 6.83–7.95 (m, 12H, Ar–H), 6.56 (d,1H, J = 8.8 Hz, CH–Cl), 4.62 (d, 1H, J = 9.0 Hz, N–CH–Ar), 2.25 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₇N₃O₂Cl₂: C, 64.00; H, 3.78; N, 9.33: Found: C, 64.15; H, 3.80; N, 9.30: MS [M]+ at m/z 450.

3-[2′-( -Chloro- -Oxo- -(p-Methoxyphenyl)Azetidin- -yl)-Phenyl]-2-Methyl Quinazolin-4-one ( 13 )

(56%) (Ethanol)m.p. 212°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹ : 3028 (CH aromatic), 2930 (CH aliphatic), 1700 (C=O), 1595 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.81–7.93 (m, 12H, Ar–H), 6.54 (d,1H, J = 9.0 Hz, CH–Cl), 4.65 (d, 1H, J = 9.3 Hz, N–CH–Ar), 3.47 (s, 3H, OCH₃) 2.23 (s, 3H, CH₃);. Anal. Calcd. for C₂₅H₂₀N₃O₃Cl: C, 67.34; H, 4.49; N, 9.43: Found: C, 67.15; H, 4.50; N, 9.40: MS [M]+ at m/z 445.5.

3-[ 2′-( -Chloro- -Oxo- -Phenylazetidin- -yl)-Phenyl]-2-Methyl-6-Bromo-Quinazolin-4-one ( 14 )

(58%) (Methanol) m.p. 176°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹ : 3030 (CH aromatic), 2925 (CH aliphatic), 1695 (C=O), 1595 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.80–7.92 (m, 12H, Ar–H), 6.54 (d, 1H, J = 9.2 Hz, CH–Cl), 4.64 (d, 1H, J = 9.1 Hz, N–CH–Ar), 2.22 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₇N₃O₂ClBr: C, 58.24; H, 3.44; N, 8.49: Found: C, 58.36; H, 3.43; N, 8.51: MS [M]+ at m/z 494.5.

3-[ 2′-( -Chloro- -Oxo- -(p-Chlorophenyl)Azetidin- -yl)-Phenyl]-2-Methyl-6-Bromo Quinazolin-4-one ( 15 )

(54%) (Ethanol) m.p. 204°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3027 (CH aromatic), 2930 (CH aliphatic), 1710 (C=O), 1598 (C=N), 785 (C–Cl); ¹HNMR (CDCl₃) δ in ppm: 6.79–7.90 (m, 11H, Ar–H), 6.55 (d, 1H, J = 9.3 Hz, CH–Cl), 4.61 (d, 1H, J = 8.8 Hz, N–CH–Ar), 2.20 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₆N₃O₂Cl₂Br: C, 54.44; H, 3.02; N, 7.94: Found: C, 54.61; H, 3.01; N, 7.95: MS [M]+ at m/z 529.

3-[ 2′-( -Chloro- -Oxo- -(P-Methoxyphenyl)Azetidin- -yl)-Phenyl]-2-Methyl Quinazolin-4-one ( 16 )

(60%) (Acetone) m.p. 246°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3030 (CH aromatic), 2930 (CH aliphatic), 1700 (C=O), 1590 (C=N); ¹HNMR (CDCl₃) δ in ppm: 6.80–7.92 (m, 11H, Ar–H), 6.52 (d, 1H, J = 9.2 Hz, CH–Cl), 4.62 (d, 1H, J = 9.0 Hz, N–CH–Ar), 3.49 (s, 3H, OCH₃) 2.25 (s, 3H, CH₃);. Anal. Calcd. for C₂₅H₁₉N₃O₃ClBr: C, 57.20; H, 3.62; N, 8.01: Found: C, 57.31; H, 3.61; N, 8.06: MS [M]+ at m/z 524.5.

3-[ 2′-( -Phenyl- -Oxo- , -Thiazolidin- -yl)Phenyl]-2-Methyl-6-Quinazolin-4-one ( 17 )

A mixture of compound 5(0.01 moles), thioglycolic acid (0.012 moles) in absolute dioxane (75 mL) and in the presence of anhydrous ZnCl₂ was refluxed for 18 hr. The solvent was removed under reduced pressure. The solid thus obtained was filtered and washed with water. The product finally obtained was dried and recrystallized from ethanol to yield compound 17 (55%) m.p. 164°C. IR (KBr): in cm⁻¹: IR (KBr) in cm−1 : 3032 (CH aromatic), 2931 (CH aliphatic), 1705 (C=O), 1595 (C=N),685 (C–S–C); ¹HNMR (CDCl₃) δ in ppm: 6.80–7.97 (m, 13H, Ar–H), 4.55 (s, 1H, N–CH–Ar), 4.25 (s, 2H, CH₂) 2.25 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₉N₃O₂S: C, 69.73; H, 4.60; N, 10.17: Found: C, 69.82; H, 4.61; N, 10.22: MS [M]+ at m/z 413.

3-[ 2′-( -(p-Chlorophenyl)- -Oxo- , -Thiazolidin- -Yl)Phenyl]-2-Methyl-Quinazolin-4-one. ( 18 )

(49%) (Methanol) m.p. 192°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹ : 3030 (CH aromatic), 2930 (CH aliphatic), 1700 (C=O), 1598 (C=N), 784 (C–Cl), 688 (C–S–C); ¹HNMR (CDCl₃) δ in ppm: 6.83–7.96 (m, 12H, Ar–H), 4.58 (s, 1H, N–CH–Ar), 4.21 (s, 2H, CH₂) 2.22 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₈N₃O₂SCl: C, 64.36; H, 4.02; N, 9.39: Found: C,64.41; H, 4.03; N, 9.35: MS [M]+ at m/z 447.5.

3-[2′-( -(p-Methoxyphenyl)- -Oxo- , -Thiazolidin- -yl)Phenyl]-2-Methyl Quinazolin-4-one ( 19 )

(50%) (Acetone) m.p. 204°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹ : 3032 (CH aromatic), 2927 (CH aliphatic), 1700 (C=O), 1600 (C=N), 690 (C–S–C),; ¹HNMR (CDCl₃) δ in ppm: 6.81–7.95 (m, 12H, Ar–H), 4.52 (s, 1H, N–CHvAr), 4.23 (s, 2H, CH₂) 3.51 (s, 3H, OCH₃), 2.20 (s, 3H, CH₃);. Anal. Calcd. for C₂₅H₂₁N₃O₃S: C, 67.72; H, 4.74; N, 9.48: Found: C,67.88; H, 4.73; N, 9.51: MS [M]+ at m/z 443.

3-[ 2′-( -Phenyl- -Oxo-1′′, -Thiazolidin- -Yl)Phenyl]-2-Methyl-6-Bromo Quinazolin-4-one ( 20 )

(55%) (Ethanol) m.p. 236°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3028 (CH aromatic), 2933 (CH aliphatic), 1705 (C=O), 1600 (C=N), 690 (C–S–C); ¹H NMR (CDCl₃) δ in ppm: 6.81–7.94 (m, 12H, Ar–H), 4.56 (s, 1H, N–CH–Ar), 4.22 (s, 2H, CH₂) 2.24 (s, 3H, CH₃). Anal. Calcd. for C₂₄H₁₈N₃O₂SBr: C, 58.54; H, 3.66; N, 8.54: Found: C,58.66; H, 3.67; N, 8.56: MS [M]+ at m/z 492.5.

3-[2′-( -(p-Chlorophenyl)- -Oxo-1′′, -Thiazolidin- -yl)Phenyl]-2-Methyl-6-Bromo Quinazolin-4-one ( 21 )

(48%) (Methanol) m.p. 267°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3033 (CH aromatic), 2925 (CH aliphatic), 1705 (C=O), 1595 (C=N), 784 (C–Cl), 685 (C–S–C); ¹HNMR (CDCl₃) δ in ppm: 6.80–7.93 (m, 11H, Ar–H), 4.52 (s, 1H, N–CH–Ar), 4.24 (s, 2H, CH₂) 2.26 (s, 3H, CH₃);. Anal. Calcd. for C₂₄H₁₇N₃O₂SClBr: C,54.70; H, 3.23; N, 7.98: Found: C, 54.86; H, 3.22; N, 7.97: MS [M]+ at m/z 526.5.

3-[2′-( -(p-Methoxyphenyl)-4′′-Oxo-1′′,3′′-Thiazolidin-3′′-yl)Phenyl]-2-Methyl-6-Bromo Quinazolin-4-one ( 22 )

(55%) (Ethanol) m.p. 254°C. IR (KBr): in cm⁻¹: IR (KBr) in cm⁻¹: 3031 (CH aromatic), 2928 (CH aliphatic), 1710 (C=O), 1605 (C=N), 685 (C–S–C); ¹HNMR (CDCl₃) δ in ppm: 6.81–7.92 (m, 11H, Ar–H), 4.59 (s,1H, N–CH–Ar), 4.25 (s, 2H, CH₂), 3.49 (s, 3H, OCH₃), 2.26 (s, 3H, CH₃);. Anal. Calcd. for C₂₅H₂₀N₃O₃SBr: C, 57.47; H, 3.83; N, 8.05: Found: C, 57.62; H, 3.82; N, 8.03: MS [M]+ at m/z 522.

3. Results and Discussion

3.1. Anti-Inflammatory Activity

The anti-inflammatory activity of newly synthesis compounds is showed in Table 1. All the compounds (5–22) were screened for anti-inflammatory activity at 50 mg/kg p.o. using phenylbutazone as reference drug. All the tested compounds exhibited 15.1 to 32.5% edema inhibition at the dose of 50 mg/kg p.o. When the compounds were substituted with p-chlorophenyl group showed better anti-inflammatory activity than phenyl group. Compounds (5–10) showed anti-inflammatory from 15.1 to 20.4%. Compound 9, which was substituted by 2′-(p-chlorobenzylideneamino)phenyl group at the IIIrd position of quinazolinone moiety showed better anti-inflammatory activity (20.4%) than compounds 5, 6, 7, 8, and 10. Cyclizations of these compounds into azetidinones and thiazolidinones have shown better anti-inflammatory activity than corresponding arylidene derivatives. Azetidinones (11–16) and thiazolidinones (17–22) have shown the anti-inflammatory activity from (24.6–27.3%) and (22.9–32.5%) respectively. In azetidinones, compound 15 showed better anti-inflammatory activity at the dose of 50 mg/kg p.o. than compounds 11, 12, 13, 14, and 16. Compound 11 exhibited lower percentage inhibition of oedema (24.6%) among azetidinones. Thiazolidinones (17–22) generally showed better anti-inflammatory then corresponding azetidinones (11–16). Among all the tested compounds, 3-[2′-(2′′-(p-chlorophenyl)-4′′-oxo-1′′,3′′-thiazolidin-3′′-yl)phenyl]-2-methyl-6-bromo quinazolin-4-one (21) showed better anti-inflammatory activity (32.5%).

Table 1: Anti-inflammatory and analgesic data of compounds 5–22 .

Comp. number
Dose

(mg/kg p.o.)
Anti-inflammatory activity % oedema inhibition
Analgesic activity %

5
50
15.1
11.6

6
50
21.8
16.2

7
50
16.7
14.9

8
50
18.2
17.1

9
50
24.1
19.3

10
50
20.4
18.5

11
50
18.3
14.6

12
50
24.6
18.7

13
50
20.8
16.2

14
50
22.4
20.6

15
50
27.3
25.8

16
50
26.1
22.2

17
50
22.9
16.3

18
50
26.3
19.8

19
50
24.5
22.4

20
50
27.1
25.1

21
50
32.5
29.6

22
50
29.8
28.3

Phenylbutazone
50
38.8
36.5

3.2. Analgesic Activity

Compounds (5–10) have shown moderate analgesic activity (11.6–19.3%). The compound 9 showed good analgesic activity (19.3%) then compounds 5, 6, 7, 8, and 10. The formation of azetidinones (11–16) and thiazolidinones (17–22) from compounds (5–10) showed better analgesic activity than corresponding arylidene derivatives. Among these, compound 21 showed the better analgesic activity (29.6%) than other tested compounds. The results of the biological study are depicted in Table 1.

4. Conclusion

It may be concluded that the compounds having 4-chlorophenyl group of quinazolinone moiety showed better anti-inflammatory activity than phenyl moiety. Azetidinone and thiazolidinone derivatives were found active than corresponding schiff base derivatives. Further, thiazolidinones showed better anti-inflammatory and analgesics activities in comparison to their corresponding azetidinones. Among all the tested compounds, compound 21 showed better anti-inflammatory (32.5%) and analgesics (29.6%) activities than other compounds of series.

Acknowledgment

This paper is dedicated to late Professor Ashok Kumar.

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