Described is a process for the preparation of Compound (7) in accordance with the following reaction scheme by reacting Compound (5) with ethylene glycol in a solvent in the presence of a Lewis acid, thereby obtaining Compound (6), and then reacting the resulting compound with a carbonate diester in a solvent in the presence of a metal alkoxide (R1, R6 each represents a C1-6 alkyl group or the like and R5 represents H or C1-5 alkyl group).
Compound (7) so obtained is useful as an intermediate for camptothecins useful as antitumor agents.
描述了一种按照以下反应方案制备化合物 (7) 的工艺:在
路易斯酸存在下,将化合物 (5) 与
乙二醇在溶剂中反应,从而得到化合物 (6),然后在
金属烷
氧基化合物(R1、R6 分别代表 C1-6 烷基或类似基团,R5 代表 H 或 C1-5 烷基)存在下,将得到的化合物与
碳酸二
酯在溶剂中反应。
这样得到的化合物(7)可用作
抗肿瘤药喜树碱的
中间体。