反应详情

Piperazine (20 g) was dissolved in water (100 mL) in a Parr bottle and then solid 4,6-dichloro-5-methoxypyrimidine (5.00 g, 27.9 mmol) was added. The mixture was vigorously stirred for 2 h at room temperature during which the 4,6-dichloro-5-methoxypyrimidine dissolved. The stirring bar was removed, catalyst (10% Pd/C, 1.0 g) was added to the turbid solution, and the mixture was then hydrogenated (60 psi, 3 h) at room temperature. The catalyst was filtered off and the filtrate extracted 3 times with CH2Cl2. The CH2Cl2 extracts were dried over Na2SO4 and concentrated in vacuo to give a clear oil which solidified upon standing (3.34 g, 61.7%). This crude product was Kugelrohr distilled (yield 3.24 g), dissolved in acetonitrile, and concentrated HCl added to precipitate the product as a white powder which was dried in vacuo (4.32 g, 94.0% from crude product, m.p. 219°-221.5° C.).

1. dissolutiondissolved
2. customThe stirring bar was removed
3. additioncatalyst (10% Pd/C, 1.0 g) was added to the turbid solution
4. customhydrogenated (60 psi, 3 h)
5. customat room temperature
6. filtrationThe catalyst was filtered off
7. extractionthe filtrate extracted 3 times with CH2Cl2
8. dry with materialThe CH2Cl2 extracts were dried over Na2SO4
9. concentrationconcentrated in vacuo
10. customto give a clear oil which
11. distillationdistilled (yield 3.24 g)
12. dissolutiondissolved in acetonitrile
13. additionconcentrated HCl added
14. customto precipitate the product as a white powder which
15. customwas dried in vacuo (4.32 g, 94.0% from crude product, m.p. 219°-221.5° C.)