草酸单乙酯三尖杉碱酯的合成及其在三尖杉酯类生物碱合成中的应用

The Synthesis of Ethyl Cephalotaxinyl Oxalate and Its Application in the Synthesis of Cephalotaxus Ester Alkaloids

用醇钠催化的酯交换方法合成了草酸单乙酯三尖杉碱酯(4),并用4和格氏试剂反应,得到合成三尖杉酯类生物碱的关键中间体α-酮酰基三尖杉碱(2),简化了已报道的一些三尖杉酯类生物碱的合成方法。

In this wrok, ethyl cephalotaxinyl oxalate was prepared by ester exchange and the synthesis of the key intermediate, α-keto-acetyl-cephalotaxine, was achieved by treating this oxalate with a Grignard reagent. This constitutes an efficient modification of previously reported mathods for the synthesis of cephalotaxus este ralkaloids.