多环四氢氧杂蒽酮包括一大类细胞毒性天然产物。没有描述任何家族成员的作用机制。我们报告了 kibdelone C 和几种简化类似物的合成。kibdeleone C 的两种对映异构体对多种人类癌细胞系都显示出低纳摩尔的细胞毒性。此外,一些具有改进化学稳定性的简化衍生物显示出比天然产物本身更高的活性。体外研究排除了与 DNA 的相互作用或拓扑异构酶的抑制,这两者都是多环芳族化合物的常见作用方式。然而,细胞研究表明,kibdelone C 及其简化的衍生物会破坏肌动蛋白 cytoseketon,而不直接结合肌动蛋白或影响其体外聚合。
The synthesis of kibdelone C, a polycyclic natural xanthone isolated from a soil actinomycete, was achieved through a convergent approach. A 6π-electrocyclization was applied to construct the highly substituted dihydrophenanthrenol fragment (B–C–D ring). InBr3-promoted lactonization was employed to build the isocoumarin ring, which served as a common precursor for the formation of isoquinolinone ring
Enantioselective Total Synthesis of (−)-Kibdelone C
作者:John R. Butler、Chao Wang、Jianwei Bian、Joseph M. Ready
DOI:10.1021/ja204040k
日期:2011.7.6
The kibdelones are aromatic polyketide natural products featuring isoquinolinone and tetrahydroxanthone ring systems. They display potent cytotoxicity toward a range of human cancer cell lines. Here, we present an enantioselective total synthesis of kibdelone C that utilizes a Shi epoxidation to establish the absolute and relative stereochemistry, an acid-catalyzedcyclization to form the tetrahydroxanthone
Kibdelones 是芳香族聚酮化合物天然产物,具有异喹啉酮和四氢氧杂蒽酮环系。它们对一系列人类癌细胞系显示出强大的细胞毒性。在这里,我们提出了 kibdelone C 的对映选择性全合成,它利用 Shi 环氧化来建立绝对和相对立体化学,酸催化环化以形成四氢氧杂蒽酮,并通过 CH 芳基化来完成六环骨架。
Total Synthesis of Terprenin, a Highly Potent and Novel Immunoglobulin E Antibody Suppressant
Regioselective halogenations and Suzuki reactions ensure proper linkage of the aromatic rings in two total syntheses of terprenin (1). Both routes make it possible to prepare 1 efficiently and in large quantity.
US7220783B2
申请人:——
公开号:US7220783B2
公开(公告)日:2007-05-22
Total Synthesis of Terprenin, a Novel Immunosuppressive <i>p</i>-Terphenyl Derivative
We achieved a total synthesis of terprenin, a novel potent immunoglobulin E antibody suppressant which was obtained from the fermentation broth of Aspergillus candidus RF-5672 and has a highlyoxygenated p-terphenyl skeleton with a prenyloxy side chain. The key steps relied on the Suzuki reaction to construct the terphenyl skeleton and on regioselective halogenations to selectively combine the aromatic