Fused pyrimidines represent an important class of heterocyclic compounds of chemotherapeutic importance. Their antifungal [1], antibacterial [2-5], antiviral [6] and cytotoxic [7] properties are well documented. Thiazolopyrimidines, in particular, are reported to possess various therapeutic properties such as analgesic [8], antiinflammatory [9-12], anti- anxiety [13, 14], antipsychotic [15-18], anti-HIV-1 [19], antidepressant [20], antibacterial [21 ...