1,2,4]Triazolo[5,1-b]-and [1,2,4]triazino [3,2-b] quinazolines have been ribosylated by coupling with 1-O-acetyl-2,3,5-tri-Obenzoyl--D-ribofuranose and by using the silylation method, followed by debenzoylation by methanolic sodium methoxide to afford the corresponding free N-nucleosides. Nucleosides obtained have been identified by their spectral analysis. From the UVvisible and fluorescence studies of some nucleosides synthesized, it is found that they have fluorescence properties. 6 ) 7.20 (d, 2H, aromatic protons, = 8.0 Hz), 7.70 (d, 2H, aromatic protons, = 8.0 Hz), 7.90 (m, 5H, aromatic protons), 11.50 (s, 1H, NH); MS (m/z) = 262 (M + , 70%). Anal. Calcd for C 15 H