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.
描述了一种制备化合物(7)的过程,根据以下反应方案,通过在溶剂中在Lewis酸存在下将化合物(5)与
乙二醇反应,从而获得化合物(6),然后在溶剂中在
金属烷氧化物(R1,R6各代表C1-6烷基或类似物,R5代表H或C1-5烷基)存在下将所得化合物与
碳酸酯二酯反应。所得的化合物(7)可用作一种前体,用于制备作为
抗肿瘤药物的
喜树碱。