Synthesis of New Camptothecin Analogues with the E-Lactone Ring Replaced by α,β-Cyclohexenone
作者:Valeriy A. Bacherikov、Tsong-Jen Tsai、Jang-Yang Chang、Ting-Chao Chou、Rong-Zau Lee、Tsann-Long Su
DOI:10.1002/ejoc.200600298
日期:2006.10
The total synthesis of racemic camptothecin analogues 12a and 12b, in which the E-lactone ring has been replaced by an α,β-cyclohexenone ring and the ethyl and hydroxy substituents have been retained, was achieved by first preparing the ABCD fragments 31a and 31b, which were then converted into the tetracyclic triol 36a and 36b by osmium-mediated dihydroxylation. Compounds 36a and 36b were oxidized
外消旋喜树碱类似物 12a 和 12b 的全合成是通过首先制备 ABCD 片段 31a 和 31b 来实现的,其中 E-内酯环已被 α,β-环己烯酮环取代并且保留了乙基和羟基取代基,然后通过锇介导的二羟基化将其转化为四环三醇 36a 和 36b。化合物 36a 和 36b 在一锅反应中被氧化,然后分子内羟醛缩合得到所需的五环化合物 12a 和 12b,它们保留了拓扑异构酶 I 抑制活性,并对培养中的肿瘤细胞生长表现出细胞毒性。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2006)