RESUMO
A series of fused and non fused 1,2,4-triazoles with (2,4-dichlorophenoxy) moiety are prepared utilizing 3-((2,4-dichlorophenoxy)methyl)-4-amino-4H-1,2,4-triazole-5-thiol (3). The latter on reaction with carboxylic acids, ethylchloroformate, ethylcyanoacetate and sodium nitrite gives five membered fused triazole derivatives 4a-d, 5, 6, 7 and 10, respectively. The six membered heterocycles 11, 12 and 14 are prepared by cyclization of compound 3 with phenacyl bromide, chloroacetic acid and alpha-bromoketone respectively. Most of the newly synthesized compounds were screened for their anti-inflammatory and molluscicidal activities. The compounds 4b, 4d, 11 and 14 showed potent anti-inflammatory activities in dose dependent manner while compounds 3, 4b, 8 and 10 exhibited promising molluscicidal activities.
Assuntos
Anti-Inflamatórios não Esteroides/síntese química , Biomphalaria/efeitos dos fármacos , Edema/tratamento farmacológico , Moluscocidas/síntese química , Tiadiazinas/síntese química , Tiadiazóis/síntese química , Animais , Anti-Inflamatórios não Esteroides/química , Anti-Inflamatórios não Esteroides/farmacologia , Carragenina , Avaliação Pré-Clínica de Medicamentos , Edema/induzido quimicamente , Estrutura Molecular , Moluscocidas/química , Moluscocidas/farmacologia , Ratos , Tiadiazinas/química , Tiadiazinas/farmacologia , Tiadiazóis/química , Tiadiazóis/farmacologiaRESUMO
Treatment of 6-aminothiouracil (1) with 2,3-dichloroquinoxaline (2) in ethanol/TEA afforded 6-amino-2-(3-chloroquinoxalin-2-ylthio)pyrimidin-4(3H)-one (3), which was refluxed in DMF to give 2-aminopyrimido[2',1':2,3]thiazolo[4,5-b]quinoxaline-4-one (4). Compound 4 was utilized as a key intermediate for the synthesis of a new pyrimido[2',1':2,3]thiazolo[4,5-b]quinoxaline derivatives 5-14via the reaction with 2-chlorobenzaldehyde, 2-chlorocyclohex-1-enecarbaldehyde, 2-chlorobenzoic acid, 2,4-dichlorobenzoic acid, 5-chloro-3-methyl-1-phenyl-1H-pyrazole-4-carbaldehyde, 2-chloro-4,6-dimethylnicotinonitrile, alpha,beta-unsaturated ketones and isonicotinaldehyde, respectively. The chemical structures of the newly synthesized compounds were characterized by IR, NMR and mass spectral analysis. These compounds were also screened for their analgesic and anti-inflammatory activities. Some of these compounds (3, 4, 9, 10 and 12-14) exhibited promising activities.