The present invention relates to a method for the preparation for camptothecin and camptothecin-like compounds and to novel intermediates used in this preparation. In particular, the invention provides a process for the preparation of the camptothecin derivative of formula (I′) known by the chemical name “7-(4-methylpiperazinomethylene)-10,11-ethylenedioxy-20(R,S)-camptothecin”, which comprises cyclising the compound of formula (II′), wherein X is halogen, particularly chloro, bromo, or iodo; and when the compound of formula (I′) is obtained as a mixture of enantiomers optionally resolving the mixture to obtain the desired enantiomer; and/or if desired, converting the resulting compound of formula (I′) or a salt thereof into a physiologically acceptable salt or solvate thereof.
本发明涉及一种制备
喜树碱和类
喜树碱的方法,以及在该制备中使用的新型中间体。具体而言,本发明提供了一种制备式(I')
喜树碱衍
生物的方法,该衍
生物以
化学名称“7-(4-甲基
哌嗪亚甲基)-10,11-乙二氧基-20(R,S)-
喜树碱”为已知,该方法包括将式(II')化合物环化,其中X为卤素,特别是
氯、
溴或
碘;当式(I')化合物作为对映体混合物获得时,可以选择分离混合物以获得所需的对映体;以及/或者如果需要,将所得的式(I')化合物或其盐转化为其生理上可接受的盐或溶剂。