Several bicyclic/tricyclic-fused pyrimidines were synthesized from the reactions of amino esters and bifunctional nucleophiles such as 2-methylthio-thiazoline and 2-methylthio-imidazoline. The synthesized compounds were tested for their in vitro antimicrobial activities that revealed mild to moderate growth inhibitory potentials.
Pyrazolothiazolopyrimidine derivatives represented by the Formula ##STR1## and pharmaceutically acceptable salts thereof are useful as anti-inflammatory, analgesic, immunomodulatory and anti-ulcer agents.