“…Pyrimidine derivatives have been reported as anti-microbial [3], analgesic, anti-viral, anti-inflammatory [4], anti-HIV [5], anti-tubercular [6], anti-tumour [7], anti-malarial [8], cardiovascular [9] agents. Pyrimidine derivatives have been found to exhibit cytostatic [10][11][12], immune modulating [13,14] and antibacterial properties [15][16][17][18][19][20][21]. In particular, studies concerning the synthesis of pyrimido [4,5-d]-1,3-oxazines [22] showing considerable similarity to quinoline chemotherapeutic agents with an antibacterial effect.…”