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发明授权
CN103145574B 一种双氯灭痛的制备方法 失效 - 权利终止

一种双氯灭痛的制备方法
摘要：
本发明公开了一种双氯灭痛的制备方法，其特征包括如下步骤：将氯化试剂与N‑(2，6‑二氯苯基)苯乙酰胺(IV)反应得到N‑氯‑N‑(2，6‑二氯苯基)苯乙酰胺(III)；将N‑氯‑N‑(2，6‑二氯苯基)苯乙酰胺(III)与一定量的Lewis酸在有机溶剂中反应得到1‑(2，6‑二氯苯基)‑2‑二氢吲哚酮(II)；最后1‑(2，6‑二氯苯基)‑2‑二氢吲哚酮(II)在氢氧化钠溶液中发生水解反应得到双氯灭痛(I)。发明提供的方法操作简单、试剂易得、价格便宜、条件温和等特点，为双氯灭痛的合成提供了一种新的工艺路线。
摘要（英）：

The invention discloses a method for preparing diclofenac sodium. The method is characterized by comprising the following steps of: obtaining N-chloro-N-(2,6-dichlorophenyl)phenylacetamide (III) through reacting a chloride reagent with N-(2,6-dichlorophenyl)phenylacetamide (IV); obtaining 1-(2,6-dichlorophenyl)-2-indolinone (II) through reacting N-chloro-N-(2,6-dichlorophenyl)phenylacetamide (III) with a certain amount of Lewis acid in an organic solvent; and finally obtaining diclofenac sodium (I) through enabling the 1-(2,6-dichlorophenyl)-2-indolinone (II) to be subjected to hydrolysis reaction in a sodium hydroxide solution. The method disclosed by the invention has the characteristics of simplicity in operation, easily-available reagents, low cost, mild conditions and the like, and provides a novel processing route for the synthesis of diclofenac sodium.

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