A process for the manufacture of 2,4-diamino-5-(substituted benzyl)pyrimidines from the corresponding 6-hydroxy-derivatives or the hydrochloride thereof by (a) chlorinating with phosphoryl chloride in presence of a considerable excess of hydrogen chloride and (b) hydrogenation of the thus easily in practically pure form and with high yields obtained 6-chloro derivatives.
一种从相应的6-羟基衍
生物或其盐酸盐制备2,4-二
氨基-5-(取代苯基)
嘧啶的方法,包括(a)在
磷酰
氯和大量过量
氯化氢存在下进行
氯化反应,以及(b)对因此得到的6-
氯衍
生物进行加氢反应,从而以实际纯度高和收率高的方式轻松制备6-
氯衍
生物。