Preparation method of lorcaserin intermediate

The invention relates to a preparation method of a lorcaserin intermediate 1-[2-(4-chlorphenyl)-ethylamino]-2-propanol, which specifically comprises the following steps: carrying out bromination reaction on p-chlorophenethyl alcohol serving as a starting material to obtain 4-chlorphenyl ethyl bromide, and condensing with isopropanolamine to obtain a target product. Hydrobromic acid is used as a bromination reagent, potassium carbonate is used as a condensation reaction acid-binding agent, potassium iodide is used as a condensation reaction catalyst, the yield of the technological process is high, three wastes are few, the cost is low, the operation is simple, the safety is good, and industrial production requirements are met. 本发明涉及一种氯卡色林中间体1-[2-(4-氯苯基)-乙基氨基]-2-丙醇的制备方法，具体包括，以对氯苯乙醇为起始物料，经溴代反应得到4-氯苯基乙基溴，再与异丙醇胺缩合，得到目标产物。本发明以氢溴酸为溴代试剂，碳酸钾为缩合反应缚酸剂，碘化钾为缩合反应催化剂，工艺过程收率高、三废少、成本低、操作简单、安全性好，适合工业化生产要求。