Total Synthesis and Biological Evaluation of Rakicidin A and Discovery of a Simplified Bioactive Analogue
作者:Michail Tsakos、Lise L. Clement、Eva S. Schaffert、Frank N. Olsen、Sebastiano Rupiani、Rasmus Djurhuus、Wanwan Yu、Kristian M. Jacobsen、Nikolaj L. Villadsen、Thomas B. Poulsen
DOI:10.1002/anie.201509926
日期:2016.1.18
We report a concise asymmetric synthesis of rakicidin A, a macrocyclic depsipeptide that selectively inhibits the growth of hypoxic cancer cells and stem‐like leukemia cells. Key transformations include a diastereoselective organocatalytic cross‐aldol reaction to build the polyketide portion of the molecule, a highly hindered ester fragment coupling reaction, an efficient Helquist‐type Horner—Wadsworth—Emmons
Application of Lithiation–Borylation to the Total Synthesis of (−)-Rakicidin F
作者:Christian P. Bold、Kay Yeung、Felix Pape、Daniel Kaiser、Varinder K. Aggarwal
DOI:10.1021/acs.orglett.2c03716
日期:2022.12.30
F had not been determined until recently. Using our lithiation–borylationmethodology (“assembly line synthesis”) we were able to efficiently prepare the all-syn isomer as well as the C-21 epimer of the side chain, and comparison with the natural product suggested that the natural product had all-syn stereochemistry. Completion of the totalsynthesisusing a macrolactamization of the northern amide
(+)-rakicidin F 亲脂性侧链的立体化学直到最近才确定。使用我们的锂化-硼化方法(“流水线合成”),我们能够有效地制备全顺式异构体以及侧链的 C-21 差向异构体,并且与天然产物的比较表明天然产物具有所有-syn 立体化学。使用北酰胺的大环内酰胺化完成全合成使我们能够证实 Wang 和 Chen 对 (+)-rakicidin F 结构的立体化学发现。
Inhibition of mevalonate 5-pyrophosphate decarboxylase by a proline-containing transition state analog
Mevalonate 5-pyrophosphate decarboxylase is involved in the conversion of MevPP to IPP in the biosynthesis of steroids and terpenoids from mevalonate. Based on a hypothetical model of the transition state of this enzymatic transformation we have synthesized novel hydroxyacetyl proline analogs that are potent inhibitors of the enzyme. Copyright (C) 1996 Elsevier Science Ltd