Reaction of a 2-amino-, 2-alkylamino- or 2-dialkylamino-4-hydroxypyrimidine, preferably also containing a methyl group at the 6 position, with an aldehyde R--CHO in presence of hydrogen and a hydrogenation catalyst introduces an alkyl group R--CH.sub.2 -- into the 5 position. The reaction is preferably carried out under superatmospheric pressure at a temperature between 80.degree. and 180.degree.C and is aided by metal salts, acids, amines, amine salts or basic ion-exchange resins.
当2-
氨基、2-烷基
氨基或2-双烷基
氨基-4-
羟基嘧啶与醛R-CHO在
氢气和加氢催化剂的存在下反应时,将在5位引入烷基R-
CH2-,最好也含有6位的甲基基团。该反应最好在超大气压下,在80°C至180°C之间的温度下进行,并辅以
金属盐、酸、胺、胺盐或碱性离子交换
树脂。