反应详情

温度

2.5 °C

A mixture of concentrated H2SO4 (7.0 mL) and fuming HNO3 (7.0 mL) was cooled to 0-5° C. and 1,3,6-trimethylpyrimidine-2,4(1H,3H)-dione (3.5 g, 22.702 mmol) was gradually added to the reaction mixture. After stirring for 2 h. at the same temperature the reaction mixture was partitioned between ethyl acetate (200 mL) and water (100 mL). The organic layer was washed with brine (2×50 mL), dried (Na2SO4) and evaporated under reduced pressure. Crude product obtained was purified by column chromatography to give 1.30 g of the product as yellow solid; 1H NMR (δ ppm, 300 MHz, DMSO-d6) 2.38 (s, 3H), 3.20 (s, 3H), 3.40 (s, 3H); APCI-MS (m/z) 198.30 (M−H).

1. customwas partitioned between ethyl acetate (200 mL) and water (100 mL)
2. washThe organic layer was washed with brine (2×50 mL)
3. dry with materialdried (Na2SO4)
4. customevaporated under reduced pressure
5. customCrude product obtained
6. customwas purified by column chromatography