Divergent Asymmetric Synthesis of Panowamycins, TM-135, and Veramycin F Using C-H Insertion with Donor/Donor Carbenes.

Divergent Asymmetric Synthesis of Panowamycins, TM-135, and Veramycin F Using C-H Insertion with Donor/Donor Carbenes.
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DOI:
10.1002/anie.202203072
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发表时间:
2022-06-20
影响因子:
16.6
通讯作者:
Shaw, Jared T.
Shaw, Jared T.
中科院分区:
化学1区
文献类型:
--
作者:
Bergstrom, Benjamin D.;Merrill, Amy T.;Fettinger, James C.;Tantillo, Dean J.;Shaw, Jared T.

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Panowamycins是一组基于异色满的天然产物,2012年首次由Satoshi Atommura及其同事从链霉菌K 07 -0010中分离出来,具有适度的抗锥虫活性。在这里,我们展示了这些天然产物的第一个合成,它们的差向异构体。在关键的成键步骤中,与供体/供体卡宾的立体选择性二铑催化的C-H插入反应构建了取代的异色满核心。该合成是在不使用保护基团的情况下完成的,并且具有后期Wacker氧化的特征。天然和合成样品之间的不一致NMR光谱显示帕诺瓦霉素A和维拉霉素F的结构错误分配。计算NMR研究表明帕诺瓦霉素A是一种替代非对映异构体,通过合成该异构体证实了这一点。在这项工作的同时,Mahmud及其同事于2021年通过更新帕诺瓦霉素A的NMR分析得出了相同的结论。在一个发散的不对称序列中,我们报告了帕诺瓦霉素A、帕诺瓦霉素B、TM-135和维拉霉素F的合成。Total Synthesis Shell游戏:帕诺瓦霉素A、帕诺瓦霉素B、TM-135、维拉霉素F和两种非天然异构体以立体选择性方式的不对称第一合成,其特征在于在构建异色满核心的关键步骤中与供体/供体卡宾发生二铑催化的C-H插入反应。这些合成揭示了帕诺瓦霉素A的结构错误分配,计算NMR研究揭示了天然异构体的正确构型,也是合成的。
Panowamycins are a group of isochroman-based natural products first isolated from Streptomyces sp. K07–0010 in 2012 by Satoshi Ōmura and coworkers that exhibit modest anti-trypanosomal activity. Herein we demonstrate the first syntheses of these natural products, their epimers. Stereoselective dirhodium-catalyzed C–H insertion reactions with a donor/donor carbene construct the substituted isochroman core in the key bond-forming step. The syntheses are completed without the use of protecting groups and feature a late-stage Wacker oxidation. Incongruent NMR spectra between natural and synthetic samples revealed the structural misassignment of panowamycin A and veramycin F. Computational NMR studies suggested panowamycin A to be an alternate diastereomer, which was confirmed by synthesizing this isomer. Concurrent with this work, in 2021 Mahmud and coworkers came to the same conclusion with an updated NMR analysis of panowamycin A. In a divergent, asymmetric sequence, we report the synthesis of panowamycin A, panowamycin B, TM-135, and veramycin F. Total Synthesis Shell Game: the asymmetric first synthesis of panowamycin A, panowamycin B, TM-135, veramycin F, and two unnatural isomers in a stereoselective fashion, featuring a dirhodium-catalyzed C–H insertion reaction with donor/donor carbenes in the key step to construct the isochroman core. These syntheses reveal a structural misassignment for panowamycin A and computational NMR studies unveil the correct configuration of the natural isomer, which was also synthesized.
DOI: 10.1038/ja.2011.139
发表时间: 2012-04-01
影响因子: 3.3
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影响因子: 4.4
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