反应详情

Piperazine (20 g, 0.233 mol, 8.33 eq) is dissolved in water (100 ml), and to this solution is added 4,6-dichloro-5-methoxypyrimidine (5.00 g, 41.9 mmol, 1.0 eq). The mixture is stirred vigorously at room temperature for 2.0 h, during which 4,6-dichloro-5-methoxypyrimidine is gradually dissolved. The reaction solution is loaded into hydrogenation reactor and added with 10% Pd/C (0.66 g), and the mixture is stirred under 60 psi (0.4 Mpa) hydrogen atmosphere for 3.0 h. The mixture is filtered, extracted with CH2Cl2 (60 ml*3) for the products in the aqueous phase. Extracts are combined, dried over anhydrous sodium sulfate and filtered by vacuum filtration, and concentrated to give a crude product (5.0 g). The crude product is left to precipitate a white solid (yield: 92.6%).

1. dissolutionis gradually dissolved
2. customThe reaction solution is loaded into hydrogenation reactor
3. filtrationThe mixture is filtered
4. extractionextracted with CH2Cl2 (60 ml*3) for the products in the aqueous phase
5. dry with materialdried over anhydrous sodium sulfate
6. filtrationfiltered by vacuum filtration
7. concentrationconcentrated