申请人:Lonza AG
公开号:US05869667A1
公开(公告)日:1999-02-09
A process for preparing 2-pyrimidinecarboxylates of the general formula: ##STR1## wherein R is C.sub.1-6 -alkyl, C.sub.3-6 -cycloalkyl, aryl or arylalkyl, and R.sup.1 to R.sup.3 are, independently of one another, hydrogen, C.sub.1-6 -alkyl, fluorinated C.sub.1-6 -alkyl, C.sub.1-6 -alkoxy, (C.sub.1-6 -alkoxy)-C.sub.1-6 -alkyl or (C.sub.1-6 -alkoxy)carbonyl. These are obtained from the corresponding 2-halopyrimidine, the corresponding alcohol ROH and carbon monoxide in the presence of a palladium/phosphine complex and a base. 2-pyrimidinecarboxylates are intermediates for preparing herbicides.
一种制备通式为:##STR1## 其中R为C.sub.1-6烷基,C.sub.3-6环烷基,芳基或芳基烷基,而R.sup.1至R.sup.3独立地为氢,C.sub.1-6烷基,氟化C.sub.1-6烷基,C.sub.1-6烷氧基,(C.sub.1-6烷氧基)-C.sub.1-6烷基或(C.sub.1-6烷氧基)羰基。这些化合物可以从相应的2-卤代嘧啶、相应的醇ROH和一种钯/膦配合物和碱的存在下,通过一种过程得到。2-嘧啶羧酸盐是制备除草剂的中间体。