A process for preparing a compound of the formula ##STR1## wherein R.sub.1 and R.sub.2 are lower alkoxy or taken together are METHYLENEDIOXY; R.sub.3 is lower alkyl or hydrogen, which comprises the step of reacting an aromatic compound of the formula ##STR2## wherein R.sub.1, R.sub.2 and R.sub.3 are as previously described, with a diamino-pyrimidine of the formula ##STR3## wherein R.sub.4 is lower alkoxy, benzyloxy, hydroxy or halogen, in the presence of an inorganic or organic acid selected from the group consisting of ortho-phosphoric acid, poly-phosphoric acid, hydrohalic acids and tri-haloacetic acids, at a temperature in the range of from about 50.degree. C. to about 110.degree. C., is described.
一种制备化合物的方法,该化合物的结构式为##STR1##其中R.sub.1和R.sub.2为较低的烷氧基或者结合在一起为亚甲二氧基;R.sub.3为较低的烷基或氢,包括以下步骤:将结构式为##STR2##其中R.sub.1、R.sub.2和R.sub.3如前所述,与结构式为##STR3##其中R.sub.4为较低的烷氧基、苄氧基、羟基或卤素,反应,在选择自正
磷酸、聚
磷酸、氢卤酸和三卤
乙酸的无机或有机酸的情况下,在温度范围从约50摄氏度到约110摄氏度进行。