反应详情

A solution of 26 g of 2,4-diamino-5-(1-benzyl-4-piperidinyl)pyrimidine in 700 ml of ethanol and 20 ml of acetic acid was hydrogenated over 5 g of Pd/C 10% at room temperature and normal pressure up to the standstill of the hydrogen uptake, whereupon it was filtered off from catalyst. The filtrate was concentrated and the crystalline residue was dissolved in 100 ml of water. Chromatography on Dowex 1 (×10 200-400 mesh) (a cation exchange resin) gave 2,4-diamino-5-(4-piperidyl)-pyrimidine of melting point 230°-231° C. (dec.) (from water).

1. filtrationnormal pressure up to the standstill of the hydrogen uptake, whereupon it was filtered off from catalyst
2. concentrationThe filtrate was concentrated
3. dissolutionthe crystalline residue was dissolved in 100 ml of water