Rapid and Systematic Exploration of Chemical Space Relevant to Artemisinins: Anti-malarial Activities of Skeletally Diversified Tetracyclic Peroxides and 6-Aza-artemisinins
作者:Karunakar Reddy Bonepally、Norihito Takahashi、Naoya Matsuoka、Hikari Koi、Haruki Mizoguchi、Takahisa Hiruma、Kyohei Ochiai、Shun Suzuki、Yutaka Yamagishi、Hideaki Oikawa、Aki Ishiyama、Rei Hokari、Masato Iwatsuki、Kazuhiko Otoguro、Satoshi O̅mura、Nobutaka Kato、Hiroki Oguri
DOI:10.1021/acs.joc.0c01017
日期:2020.8.7
To achieve both structural changes and rapid synthesis of the tetracyclic scaffold relevant to artemisinins, we explored two kinds of de novo synthetic approaches that generate both skeletally diversified tetracyclic peroxides and 6-aza-artemisinins. The anti-malarial activities of the tetracyclic peroxides with distinct skeletal arrays, however, were moderate and far inferior to artemisinins. Given
为了实现与青蒿素有关的四环支架的结构变化和快速合成,我们探索了两种从头开始生成骨架多样化的四环过氧化物和6-氮杂-青蒿素的合成方法。然而,具有独特骨架排列的四环过氧化物的抗疟疾活性中等,远不及青蒿素。给定青蒿素的特权支架,我们接下来设想在C6位置用氮植入元素,而没有取代基和官能团的修整。这种分子设计允许对迄今未探索的环己烷部分(C环)进行深层次的结构修饰,同时保持青蒿素的三维结构。值得注意的是,这种方法引起了逆向合成转化的剧烈变化,从而可以快速催化不对称合成,并在三个位置(N6,C9,和C3)的6-氮杂青蒿素。这些从头合成方法导致体内活性大大增强的先导发现,这破坏了青蒿素的C环似乎只是结构单元而成为抗疟药效团的功能区域这一普遍观念。此外,我们意外地发现,外消旋6-氮杂-青蒿素(33)在体内的功效要优于手性药物和一线药物青蒿琥酯。