Disclosed are a preparation method for praziquantel and intermediates thereof. The method comprises: a target product praziquantel is obtained by using β-phenethylamine as an initial raw material through the condensation reaction with chloroacetyl chloride, the substitution reaction with ethanolamine, and the acylation reaction with cyclohexanecarbonyl chloride, and then followed by the oxidation reaction and the cyclization reaction. Also disclosed are two key intermediates, namely, a formula IV compound and a formula V compound for preparing the praziquantel. The preparation method is reasonable and simple in technological design, moderate in reaction conditions, economical and environment-friendly; raw materials are inexpensive and easy to get, the key intermediates are easy to prepare, the total reaction yield is high (≥ 60%), and the purity of the obtained target product formula I compound praziquantel is high (the HPLC determined purity ≥ 99.8%), so that the industrialized mass production is easy to realize.
本发明公开了一种
吡喹酮及其中间体的制备方法。该方法包括:以β-苯
乙胺为初始原料,经与
氯乙酰氯的缩合反应、与
乙醇胺的取代反应、与环己基
甲酰氯的酰化反应,再经氧化反应和环化反应得到目标产物
吡喹酮。此外,还公开了制备
吡喹酮的两种关键中间体,即式 IV 化合物和式 V 化合物。该制备方法工艺设计合理简单,反应条件适中,经济环保;原料价廉易得,关键中间体易于制备,反应总收率高(≥60%),得到的目标产物式I化合物
吡喹酮纯度高(HPLC测定纯度≥99.8%),易于实现工业化大规模生产。