Modular Approaches to Lankacidin Antibiotics.

Modular Approaches to Lankacidin Antibiotics.
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DOI:
10.1021/jacs.0c06648
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发表时间:
2020-09-02
影响因子:
15
通讯作者:
Seiple IB
Seiple IB
中科院分区:
化学1区
文献类型:
--
作者:
Cai L;Yao Y;Yeon SK;Seiple IB

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Lankacidins是一类从链霉菌中分离出来的聚酮类天然产物,具有良好的抗菌活性。由于其复杂的分子结构和化学不稳定性,lankaidins的结构分配和衍生化具有挑战性。在这里,我们描述了三种完全合成的lankacidins方法,使其能够在该类中获得新的结构可变性。我们使用这些途径系统地生成了环和非环乳酸素的立体化学衍生物。此外,我们还获得了一系列新的lankacidins,这些lankacidins在C4位置上有一个甲基,这是一种旨在提高化学稳定性的修饰。在这项工作中,我们发现两种lankacidin类天然产物的报道结构不正确,我们确定了2,18-seco-lankacidinol B和异lankacidinol的正确结构。我们还评估了几种异酸素和仲酸素在体外抑制细菌生长和抑制翻译的能力。这项工作使人们深入了解这类抗生素丰富的化学复杂性,并为进一步的结构衍生化提供了途径。
Lankacidins are a class of polyketide natural products isolated from Streptomyces spp. that show promising antimicrobial activity. Owing to their complex molecular architectures and chemical instability, structural assignment and derivatization of lankacidins is challenging. Herein we describe three fully synthetic approaches to lankacidins that enable access to new structural variability within the class. We use these routes to systematically generate stereochemical derivatives of both cyclic and acyclic lankacidins. Additionally, we access a new series of lankacidins bearing a methyl group at the C4 position, a modification intended to increase chemical stability. In the course of this work, we discovered that the reported structures for two natural products of the lankacidin class were incorrect, and we determine the correct structures of 2,18-seco-lankacidinol B and iso-lankacidinol. We also evaluate the ability of several iso- and seco-lankacidins to inhibit the growth of bacteria and to inhibit translation in vitro. This work grants insight into the rich chemical complexity of this class of antibiotics and provides an avenue for further structural derivatization.
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