申请人:Bayer Aktiengesellschaft
公开号:US04713456A1
公开(公告)日:1987-12-15
A process for the preparation of a 5-acylpyrimidine of the formula ##STR1## in which R is an organic radical comprising reacting a methyl ketone of the formula R--CO--CH.sub.3 in a first stage with a formylating reagent in the presence of a base to form an enolketone of the formula R--CO--CH.dbd.CH--OR.sup.10 in which R.sup.10 represents hydrogen or a base radical, thereafter reacting the enolketone in 2nd and 3rd stages with formamidine or a formamidine salt, and with an amino-formylating agent, and, in a 4th stage heating to cyclize the compound formed. The end products, some of which are new, are intermediates for making herbicides.
制备式为 ##STR1## 的5-酰基嘧啶的过程,其中R为有机基团,包括以下步骤:第一阶段,在碱存在下,用甲基酮R-CO-CH.sub.3与甲酰化试剂反应,形成烯酮R-CO-CH.dbd.CH-OR.sup.10,其中R.sup.10代表氢或碱基团;第二和第三阶段,将烯酮与甲酰胺或甲酰胺盐以及氨基甲酰化试剂反应;第四阶段,在加热条件下环化所形成的化合物。其中一些最终产物是制造除草剂的中间体,其中一些是新的。