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To a solution of thymine (1) in THF was added pyridine and the reaction was cooled to 0° C. Benzoyl chloride was added carefully at 0° C. and the reaction was stirred overnight at room temperature. The reaction mass was evaporated to give the crude solid which was purified by SiO2 flash chromatography to give the N3-benzoyl thymine (4) as a white solid. NMR (600 MHz, CD3OD): δ 7.94 (m, 2H), 7.71 (t, 1H, J=7.3 Hz), 7.57 (m, 2H), 7.38 (s, 1H), 1.90 (s, 3H); Mass (ESI-MS): 231.22 (M+H); m.p: 178-180° C.

1. customThe reaction mass was evaporated
2. customto give the crude solid which
3. customwas purified by SiO2 flash chromatography