[Show abstract][Hide abstract] ABSTRACT: A simple and general method has been developed for the synthesis of various 3,4-dihydro quinazolinone derivatives by the treatment of an aldehydes with excess equivalent of urea in ethanol affords Arylideno-bis-ureas 1 which on condensation with p-amino benzoic acid in acidic medium cyclised to 4-aryl-6-hydroxy-2-oxo-3,4-dihydroquinazolines 2. Reaction of 2 with benzoylchloride in 10% NaOH results in 1-benzoyl 4-aryl-6-hydroxy-2-oxo-3,4-dihydroquinazolin-2(H)-one 3. The structures of the compounds were characterized by elemental analysis, IR, 1H-NMR and 13C-NMR spectra. Compounds 3 have been evaluated for their analgesic and antibacterial activity.
[Show abstract][Hide abstract] ABSTRACT: A series of substituted pyridinyl 1, 3, 4 oxadiazole derivatives were synthesized from Schiff bases of
nicotinic acid derivatives through chlorination followed by reaction with hydrazine hydrate and with the use
various aldehydes. The synthesized compounds were characterized by elemental analysis,H NMR and Mass
Spectra. All the compounds were screened for in vitro antioxidant activity by DPPH and Nitric oxide scavenging assay. Compounds substituted with electron donating groups like methoxy and hydroxyl showed higher antioxidant activity.
Research Journal of Pharmaceutical, Biological and Chemical Sciences 10/2010; 1(4):1083-1090. · 0.35 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Some novel Mannich base isatin derivatives were synthesized by reacting 1-(5-methyl-2-oxoindolin-3-ylidene)-4-(substitutedpyridin-2-yl)thiosemicarbazide with formaldehyde and several secondary amines. Their chemical structure was elucidated by means of spectral (FT-IR, (1)H- and (13)C-NMR and mass) analysis. Investigation of anti-inflammatory activity of synthesized compounds was done by carrageenan induced paw oedema method using diclofenac sodium as standard drug and analgesic activity was done by acetic acid induced writhing method. The synthesized compounds showed significant anti-inflammatory and analgesic activity.
[Show abstract][Hide abstract] ABSTRACT: A series of 1-(5-substituted-2-oxoindolin-3-ylidene)-4-(substituted-pyridin-2-yl)thio semicarbazide derivatives were synthesized by the reaction of 4-(substituted-pyridin-2-yl) thiosemicarbazide and 5-halogenated isatin derivatives. The newly synthesized compounds were characterized on the basis of spectral (FT-IR, 1 H, 13 C NMR and mass) analysis. Investigation of in vitro anti-bacterial and anti-fungal activity of synthesized compounds was done by disc diffusion method against B. subtilis, S. aureus, E. coli, P. aeruginosa, C. albicans, and A. niger. All the compounds exhibited moderate to good anti-bacterial and anti-fungal activity.
[Show abstract][Hide abstract] ABSTRACT: Some novel mannich base isatin derivatives were synthe-sized by reacting 1-(5-chloro-2-oxoindolin-3-ylidene)-4-(pyridine-2-yl)thiosemicarbazide with formaldehyde and several secondary amines. Their chemical structures were elucidated by means of spectral (FT-IR, 1 H NMR and mass) analysis. Investigation of in vitro antibacterial and antifungal activity of synthesized compounds was done by disc diffusion method against B. subtilis, S. aureus, E. coli, P. aeruginosa, C. albicans and A. niger. All the synthesized compounds were screened for anticonvulsant activity by MES method using phenytoin as standard drug. All the compound exhibited moderate to good antibacterial and antifungal activity. All the compounds of the series exhibited significant anticonvulsant activity at 100 mg/kg dose level.