申请人:Bayer Aktiengesellschaft
公开号:US05623076A1
公开(公告)日:1997-04-22
The invention relates to a new process for the preparation of chloromethylpyridines of the general formula (I) ##STR1## in which X.sup.1 represents hydrogen, halogen or alkyl, characterized in that pyridine derivatives of the general formula (II) ##STR2## in which R.sup.1 and X.sup.1 have the meaning given in the description, are reacted by means of a formamide derivative of the general formula (III) ##STR3## in which R.sup.2 and R.sup.3 are identical or different and represent alkyl or cycloalkyl or together represent alkanediyl, and with a chlorinating agent, if appropriate in the presence of a diluent, at temperatures between 20.degree. and 120.degree. C. The invention furthermore relates to new pyridine derivatives of the formula (II) and their preparation.
本发明涉及一种制备一般式为(I)的氯甲基吡啶的新工艺:##STR1## 其中X1代表氢、卤素或烷基。其特征在于,采用一种一般式为(III)的甲酰胺衍生物和氯化剂(必要时在稀释剂存在下)在20℃到120℃的温度下反应,其中R2和R3相同或不同,代表烷基或环烷基,或者一起代表脂肪二烯基,通过一般式(II)的吡啶衍生物进行反应,其中R1和X1的含义如描述所述。本发明还涉及一种新的一般式为(II)的吡啶衍生物及其制备方法。