2,3 -dichloro -5 -(trifluoromethyl)pyridine or 2 -fluoro -3 -Dichloro -5 -(trifluoromethyl)pyridine as raw materials,react with acetamide at 20℃ to get 3-chloro-2-acetamido-5-trifluoromethylpyridine,then hydrolyzed by sodium hydroxide to get 2-amino-3-Chloro-5-(trifluoromethyl)pyridine at 50℃.%以2,3-二氯-5-三氟甲基吡啶或2-氟-3-氯-5-三氟甲基吡啶作为原料,与乙酰胺在20℃进行反应而制得3-氯-2-乙酰胺基-5-三氟甲基吡啶;之后经氢氧化钠50℃下水解而制得2-氨基-3-氯-5-三氟甲基吡啶.
展开▼