反应详情

Compound 4,6-Dichloro-pyrimidine-5-carbaldehyde (8.6 g, 0.049 mmol), anhydrous ethylene glycol (8.2 ml) and p-Toluene-sulfonic acid (150 mg) were mixture in benzene (200 mL) and heated under reflux for 3 hours. Concentrate under high vacuum, worked up with chloroform, water, sodium bicarbonate and sodium chloride, concentrate. The reaction mixture was purified on silica (CH2Cl2) to give 4,6-Dichloro-5-[1,3]dioxolan-2-yl-pyrimidine (8.86 g, 82.5%). 1H NMR 400 MHz CDCl3 δ(ppm): 8.8 (s, 1H), 6.3 (s, 1H), 4.3 (m, 2H), 4.1 (m, 2H).

1. temperatureheated
2. temperatureunder reflux for 3 hours
3. concentrationConcentrate under high vacuum
4. concentrationconcentrate
5. customThe reaction mixture was purified on silica (CH2Cl2)