Synthesis of (+)-cortistatin A.

Synthesis of (+)-cortistatin A.
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DOI:
10.1021/ja8023466
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发表时间:
2008-06-11
影响因子:
15
通讯作者:
Baran PS
Baran PS
中科院分区:
化学1区
文献类型:
--
作者:
Shenvi RA;Guerrero CA;Shi J;Li CC;Baran PS

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皮质抑素A是一种海洋类固醇,具有高度选择性,可能是机制上独特的抗血管生成活性。在这里,我们报告了合成这种天然产物的方式“corticostatinone”,中间体非常适合调查的关键药效团的corticostatinone家族。合成从一种陆地类固醇开始,通过发现独特的化学反应性,穿过一条通往皮质抑素A的路线。具体来说,我们展示了第一个例子的定向,偕C-H双氧化,一个新的碎片级联访问扩展的B环类固醇系统,化学选择性环化安装的标志oxabicycline的皮质抑素家族,和一个显着的选择性氢化反应,这应该找到广泛的应用在未来的合成的皮质抑素和设计的类似物。该合成显示出一定程度的简洁性,效率和实用性,这将是至关重要的,在评估这类迷人的海洋类固醇的药用潜力。
Cortistatin A is a marine steroid with highly selective and perhaps mechanistically unique antiangiogenic activity. Herein we report a synthesis of this natural product by way of “cortistatinone”, an intermediate ideally suited for investigating the key pharmacophore of the cortistatin family. The synthesis begins with a terrestrial steroid and traverses a route to cortistatin A through the discovery of unique chemical reactivity. Specifically, we demonstrate the first example of a directed, geminal C−H bisoxidation, a new fragmentation cascade to access expanded B-ring steroid systems, a chemoselective cyclization to install the hallmark oxabicycle of the cortistatin family, and a remarkably selective hydrogenation reaction, which should find extensive use in future syntheses of the cortistatins and designed analogues. The synthesis displays a level of brevity, efficiency, and practicality that will be crucial in evaluating the medicinal potential of this fascinating class of marine steroids.
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