A highly pure hydroquinone dietser derivative can be produced from the reaction product of ketoisophorone with an acylating agent in a high yield by a simple and easy operation. In the presence of an acid catalyst, a cyclohex-2-ene-1,4-dione derivative shown by the following formula (3) was allowed to react with an acylating agent (e.g., acetic anhydride), and the reaction product was purified by crystallization to obtain a hydroquinone diester derivative shown by the following formula (1). The compound (1) contains about 0 to 4% by weight of a catechol diester derivative represented by the following formula (2), being highly pure. As a solvent for crystallization, a mixed solvent of an organic carboxylic acid (e.g., acetic acid) corresponding to the acylating agent and water may be used.
1
In the formulae, R
1
and R
2
each represents an alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group.
可以从ketoisophorone和酰化剂的反应产物中以高产率简单易操作的方式生产高纯度的羟基
喹啉醚衍
生物。在酸催化剂的存在下,通过以下公式(3)所示的环己-2-烯-1,4-二酮衍
生物与酰化剂(例如
醋酸酐)发生反应,反应产物经结晶纯化即可获得以下公式(1)所示的羟基
喹啉醚衍
生物。化合物(1)含有约0至4%重量的由以下公式(2)表示的
间苯二酚酯衍
生物,具有高纯度。作为结晶溶剂,可以使用与酰化剂对应的有机
羧酸(例如
醋酸)和
水的混合溶剂。在上述公式中,R1和R2分别表示烷基、环烷基、芳基或杂环基。