The present disclosure provides a preparation method for m-diamide compounds. The method includes the following steps: 2-fluoro-3-nitrobenzoyl chloride and 4-(perfluoropropane-2-yl)-2-(trifluoromethyl)aniline are subjected to a condensation reaction, followed by a reduction reaction and an alkylation reaction to give 2-fluoro-3-(alkylamino)-N-(4-(perfluoropropane-2-yl)-2-(trifluoromethyl)phenyl)benzamide, which reacts with an acyl chloride compound to give 2-fluoro-3-(alkylbenzamido)-N-(4-(perfluoropropane-2-yl)-2-(trifluoromethyl)phenyl)benzamide, which is finally brominated to obtain the m-diamide compound. The reactions are almost quantitative with few by-products. Cryogenic and high-temperature reactions are not used. The introduction of bromine atoms at specific sites can be achieved in the final step. The preparation method has high yield and is more suitable for industrial production.
本公开提供了一种m-二酰胺化合物的制备方法。该方法包括以下步骤:将2-
氟-
3-硝基
苯甲酰氯和4-(
全氟丙烷-2-基)-
2-(三氟甲基)苯胺进行缩合反应,然后进行还原反应和烷基化反应,得到2-
氟-3-(烷基
氨基)-N-(4-(
全氟丙烷-2-基)-2-(三
氟甲基)苯基)苯甲酰胺,该化合物与酰
氯化合物反应,得到2-
氟-3-(烷基苯甲酰胺基)-N-(4-(
全氟丙烷-2-基)-2-(三
氟甲基)苯基)苯甲酰胺,最后进行
溴化反应,得到m-二酰胺化合物。反应几乎定量,副产物很少,不使用低温和高温反应。在最后一步可以实现在特定位置引入
溴原子。该制备方法产量高,更适合工业生产。