申请人:DEGUSSA AG
公开号:US20030060628A1
公开(公告)日:2003-03-27
The invention relates to a process for the preparation of 4,6-dihydroxypyrimidine by reaction of malonic ester with formamide and alkali metal alkoxide. The malonic ester is added alone or simultaneously with the total quantity or a portion of the formamide, in portions or continuously with monitoring of the temperature, to the alkali metal alkoxide prepared as a solution or suspension in an alcohol, alone or together with the total quantity or remaining quantity of the formamide. A temperature of from 102 to <120° C. is then set for from 10 to <60 minutes. The work-up after the holding time in said temperature range is then carried out by methods known per se.
本发明涉及一种制备4,6-二羟基嘧啶的方法,通过将丙二酸酯与甲酰胺和碱金属烷氧化物反应。丙二酸酯可以单独加入或同时与甲酰胺的全部或部分分量分批或连续加入,同时监测温度,加入到以醇溶液或悬浮液形式制备的碱金属烷氧化物中,可以单独加入或与甲酰胺的全部或剩余分量一起加入。然后将温度设置在102℃至120℃之间,保持时间为10至60分钟。在保持时间内的该温度范围内的收尾工作是采用已知方法进行的。