申请人:EISAI CHEMICAL CO., LTD.
公开号:EP0670300A2
公开(公告)日:1995-09-06
A process for the industrial preparation of the quinone derivative represented by the following general formula:
which is a preparation intermediate for chroman derivatives useful as a blood suger lowering agent, and novel intermediates, are provided.
A preparation process for preparing the above quinone derivative encompasses the following:
(1) Oxidation of the corresponding hydroquinone derivative, and
(2) Hydrolysis of the corresponding acyl hydroquinone derivative with a Claisen alkali, followed by the oxidation of resulting hydrolyzate.
本发明提供了一种工业制备由以下通式表示的醌衍
生物的工艺:
的醌衍
生物的工业制备工艺以及新型中间体。
制备上述醌衍
生物的制备工艺包括以下内容:
(1) 氧化相应的
对苯二酚衍
生物,以及
(2) 用克莱森碱
水解相应的酰基
对苯二酚衍
生物,然后氧化生成的
水解物。