3-aminocrotonate compounds, e.g. diesters, which are substituted on the C-4 atom by at least two chlorine and/or fluorine atoms, are produced by reacting corresponding acetoacetate compounds with ammonia and primary and secondary amines while simultaneously or subsequently eliminating water. The reaction is carried out in the presence of onium salts formed from primary or secondary amines and carboxylic acids. Preferably, two phases are formed; one phase containing the crotonate compound product with a good degree of purity and the other phase containing the onium salt and water.
将相应的
乙酰乙酸酯化合物与
氨、
伯胺和仲胺反应,同时或随后除去
水,可制得 C-4 原子上至少被两个
氯原子和/或
氟原子取代的 3-
氨基
巴豆酸酯化合物(如二酯)。反应在由
伯胺或仲胺和
羧酸形成的鎓盐存在下进行。最好形成两相;一相含有纯度较高的
巴豆酸盐化合物产物,另一相含有鎓盐和
水。