Synthesis of 8-trifluloromethyl-2-thioquinazolin-(1H,3H)-4-one 2. which have been ribosylated by coupling with 1-O-acetyl-2,3,5-tri-O-benzoyl--D-ribofuranose 4 by using the silylation method, afforded β-anomeric of the benzoylated nucleoside derivatives 5. Debenzoylation of 5 by sodium metal in dry methanol to afford the corresponding free nucleosides 6. The structures of the newly synthesis compounds have been confirmed on the basis of elemental analyses, IR, 1 HNMR,
13CNMR and Mass spectral data.