反应详情

6-Chloro-5-isopropyl-1H-pyrimidine-2,4-dione (18.8 g, 100 mmol) was stirred with anhydrous powdered potassium carbonate (16.56 g, 120 mmol) in DMF (200 mL) at room temperature. After 40 min., iodoethane (8 mL, 100 mmol) was added and the mixture was stirred overnight. The mixture was evaporated in vacuo and the residue was purified by silica gel column chromatography (eluent, ethyl acetate:hexane (from 1:4 to 1:2)) to give 13.8 (63%) of 6-chloro-1-ethyl-5-isopropyl-1H-pyrimidine-2,4-dione as a white solid. m.p. 160-161° C.; 1H-NMR (200 MHz, CDCl3) δ 1.28-1.35 (9H, m), 3.22 (1H, m), 4.15 (2H, q, J=7.2 Hz); m/z (EI) 216 (M+).

1. customThe mixture was evaporated in vacuo
2. customthe residue was purified by silica gel column chromatography (eluent, ethyl acetate:hexane (from 1:4 to 1:2))