Synthesis and antimicrobial and anti-inflammatory activities of substituted 2-mercapto-3-(N-aryl)pyrimido[5,4-c]cinnolin-4-(3H)-ones.

Ten new substituted 2-mercapto-3-(N-aryl)pyrimido[5,4-c]cinnolin-4- (3H)-ones (4) were prepared by refluxing substituted 4-aminocinnolin-3-carboxylic acid (3) with substituted arylisothiocyanate in anhydrous pyridine. These derivatives were evaluated for their antimicrobial and anti-inflammatory activities. Some of the title compounds possess potent antimicrobial activity.