Stereoselective Synthesis of 1-Tuberculosinyl Adenosine; a Virulence Factor of Mycobacterium tuberculosis.

Stereoselective Synthesis of 1-Tuberculosinyl Adenosine; a Virulence Factor of Mycobacterium tuberculosis.
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DOI:
10.1021/acs.joc.6b01332
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发表时间:
2016-08-05
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Minnaard AJ
Minnaard AJ
中科院分区:
其他
文献类型:
--
作者:
Buter J;Heijnen D;Wan IC;Bickelhaupt FM;Young DC;Otten E;Moody DB;Minnaard AJ

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尽管结核分枝杆菌 (Mtb) 感染是世界上最流行和最致命的细菌病原体之一,但它通常无法通过快速且高度可靠的检测来诊断。一项发现 Mtb 特异性生物标志物的计划最近发现了两种天然化合物:1-结核菌素腺苷 (1-TbAd) 和 N6-结核菌素腺苷 (N6-TbAd)。基于它们与毒力的关联、自然界中缺乏类似化合物、存在多个立体中心以及需要丰富的产品来开发诊断测试,这些化合物的合成被认为具有高价值但具有挑战性。在这里,描述了 1-TbAd 和 N6-TbAd 的多克规模立体选择性合成。作为关键步骤,开发了手性辅助介导的狄尔斯-阿尔德环加成反应,引入了具有高外切比(10:1)和出色的对映选择性(> 98% ee)的三个立构中心。这是首次利用卤烷骨架立体选择性合成二萜。计算研究解释了观察到的立体化学结果。
Despite its status as one of the world’s most prevalent and deadly bacterial pathogens, Mycobacterium tuberculosis (Mtb) infection is not routinely diagnosed by rapid and highly reliable tests. A program to discover Mtb-specific biomarkers recently identified two natural compounds, 1-tuberculosinyl adenosine (1-TbAd) and N6-tuberculosinyl adenosine (N6-TbAd). Based on their association with virulence, the lack of similar compounds in nature, the presence of multiple stereocenters, and the need for abundant products to develop diagnostic tests, synthesis of these compounds was considered to be of high value but challenging. Here, a multigram-scale stereoselective synthesis of 1-TbAd and N6-TbAd is described. As a key-step, a chiral auxiliary-mediated Diels–Alder cycloaddition was developed, introducing the three stereocenters with a high exo endo ratio (10:1) and excellent enantioselectivity (>98% ee). This constitutes the first entry into the stereoselective synthesis of diterpenes with the halimane skeleton. Computational studies explain the observed stereochemical outcome.
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