首页>
外国专利>
Method of synthesis of pyridines, carboxylic or carboxamides orthohalogenees and new pyridines, carboxylic or carboxamides orthofluorees.
Method of synthesis of pyridines, carboxylic or carboxamides orthohalogenees and new pyridines, carboxylic or carboxamides orthofluorees.
展开▼
机译:吡啶,羧酸或羧酰胺邻卤化物和新的吡啶,羧酸或羧酰胺邻氟化合物的合成方法。
展开▼
页面导航
摘要
著录项
相似文献
摘要
The present invention relates to a process for the synthesis of ortho-halogenated pyridinecarboxylic acids or pyridinecarboxamides. ortho-Halogenated pyridinecarboxylic acids are obtained by the reaction, in an organic solvent medium, of a halopyridine with an organolithium derivative, followed by reaction with CO2, then by hydrolysis and by acidification of the reaction medium. It is then possible to obtain the corresponding ortho-halogenated pyridinecarboxamides by the usual known methods. The invention also relates to (x+1)-fluoropyridine-x-carboxylic acid or (x+1)-fluoropyridine-x-carboxamide, x being equal to 2 or 3, and to 3-fluoropyridine-4-carboxylic acid or 3-fluoropyridine-4-carboxamide, which are novel compounds. ortho-Halogenated pyridinecarboxylic acids or pyridinecarboxamides are important intermediates in the synthesis of medicaments or of plant-protection derivatives.
展开▼