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Le Du E, Ramirez NP, Nicolai S, Scopelliti R, Fadaei‐Tirani F, Wodrich MD, Hari DP, Waser J. X‐Ray and NMR Structural Data of Ethynylbenziodoxolones (EBXs) Reagents and Their Analogues. Helv Chim Acta 2023. [DOI: 10.1002/hlca.202200175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Affiliation(s)
- Eliott Le Du
- Laboratory of Catalysis and Organic Synthesis Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306, CH-1015 Lausanne Switzerland
| | - Nieves P. Ramirez
- Laboratory of Catalysis and Organic Synthesis Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306, CH-1015 Lausanne Switzerland
| | - Stefano Nicolai
- Laboratory of Catalysis and Organic Synthesis Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306, CH-1015 Lausanne Switzerland
| | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC GE BCH 2111, CH-1015 Lausanne Switzerland
| | - Farzaneh Fadaei‐Tirani
- Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC GE BCH 2111, CH-1015 Lausanne Switzerland
| | - Matthew D. Wodrich
- Laboratory of Catalysis and Organic Synthesis Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306, CH-1015 Lausanne Switzerland
| | - Durga Prasad Hari
- Laboratory of Catalysis and Organic Synthesis Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306, CH-1015 Lausanne Switzerland
| | - Jerome Waser
- Laboratory of Catalysis and Organic Synthesis Institut des Sciences et Ingénierie Chimique Ecole Polytechnique Fédérale de Lausanne EPFL SB ISIC LCSO BCH 4306, CH-1015 Lausanne Switzerland
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Svenningsen EB, Ottosen RN, Jørgensen KH, Nisavic M, Larsen CK, Hansen BK, Wang Y, Lindorff-Larsen K, Tørring T, Hacker SM, Palmfeldt J, Poulsen TB. The covalent reactivity of functionalized 5-hydroxy-butyrolactams is the basis for targeting of fatty acid binding protein 5 (FABP5) by the neurotrophic agent MT-21. RSC Chem Biol 2022; 3:1216-1229. [PMID: 36320884 PMCID: PMC9533406 DOI: 10.1039/d2cb00161f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Accepted: 09/02/2022] [Indexed: 11/21/2022] Open
Abstract
Covalently acting compounds experience a strong interest within chemical biology both as molecular probes in studies of fundamental biological mechanisms and/or as novel drug candidates. In this context, the identification of new classes of reactive groups is particularly important as these can expose novel reactivity modes and, consequently, expand the ligandable proteome. Here, we investigated the electrophilic reactivity of the 3-acyl-5-hydroxy-1,5-dihydro-2H-pyrrole-2-one (AHPO) scaffold, a heterocyclic motif that is e.g. present in various bioactive natural products. Our investigations were focused on the compound MT-21 – a simplified structural analogue of the natural product epolactaene – which is known to have both neurotrophic activity and ability to trigger apoptotic cell death. We found that the central N-acyl hemiaminal group of MT-21 can function as an electrophilic centre enabling divergent reactivity with both amine- and thiol-based nucleophiles, which furthermore translated to reactivity with proteins in both cell lysates and live cells. We found that in live cells MT-21 strongly engaged the lipid transport protein fatty acid-binding protein 5 (FABP5) by direct binding to a cysteine residue in the bottom of the ligand binding pocket. Through preparation of a series of MT-21 derivatives, we probed the specificity of this interaction which was found to be strongly dependent on subtle structural changes. Our study suggests that MT-21 may be employed as a tool compound in future studies of the biology of FABP5, which remains incompletely understood. Furthermore, our study has also made clear that other natural products containing the AHPO-motif may likewise possess covalent reactivity and that this property may underlie their biological activity. In this work, it is shown that an N-acyl hemiaminal motif present in many natural products can function as an electrophilic centre, mediating covalent reactivity in biological systems, reacting with both thiols and amines.![]()
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Affiliation(s)
| | - Rasmus N. Ottosen
- Department of Chemistry, Aarhus University, DK-8000, Aarhus C, Denmark
| | | | - Marija Nisavic
- Department of Chemistry, Aarhus University, DK-8000, Aarhus C, Denmark
- Department of Clinical Medicine – Research Unit for Molecular Medicine, Aarhus University Hospital, DK-8200 Aarhus N, Denmark
| | - Camilla K. Larsen
- Department of Engineering – Microbial Biosynthesis, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Bente K. Hansen
- Department of Chemistry, Aarhus University, DK-8000, Aarhus C, Denmark
- Interdisciplinary Nanoscience Center (iNANO), Aarhus University, DK-8000 Aarhus C, Denmark
| | - Yong Wang
- Copenhagen Biocenter, University of Copenhagen, DK-2200 Copenhagen N, Denmark
| | | | - Thomas Tørring
- Department of Engineering – Microbial Biosynthesis, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Stephan M. Hacker
- Leiden Institute of Chemistry, Leiden University, NL-2333 CC Leiden, The Netherlands
| | - Johan Palmfeldt
- Department of Clinical Medicine – Research Unit for Molecular Medicine, Aarhus University Hospital, DK-8200 Aarhus N, Denmark
| | - Thomas B. Poulsen
- Department of Chemistry, Aarhus University, DK-8000, Aarhus C, Denmark
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The [4.3.0] Piperidine Alkaloids: Architectures, Biology, Biosyntheses, and the Complete Details of the Asymmetric Syntheses of Streptazone A and Abikoviromycin. Synlett 2021. [DOI: 10.1055/a-1688-0826] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
AbstractPiperidine alkaloids continue to challenge the synthetic community by featuring densely functionalized scaffolds that often require careful chemical orchestration. Streptazone A and abikoviromycin are small and highly functionalized piperidine alkaloids, both accommodating Michael acceptors and a labile epoxide. These moieties are loaded into a [4.3.0] bicyclic core also present in other structurally related natural products, including the well-known piperidine alkaloid streptazolin. Here, we cover ring-closing strategies employed in earlier streptazolin syntheses; provide a concise overview of structures, biological properties, and biosyntheses of selected [4.3.0] piperidine alkaloids; and, finally, provide complete coverage of our recent asymmetric syntheses of streptazone A and abikoviromycin.1 Introduction2 Streptazolin Syntheses3 Epo-[4.3.0] Piperidine Alkaloids3.1 Streptazones3.2 Abikoviromycin3.3 Strepchazolin A and B3.4 Hatomamicin3.5 Kobutimycin A and B3.6 Camporidines A and B3.7 Epostatin3.8 N-Hydroxydihydroabikoviromycin3.9 Dihydroabikoviromycin3.10 Biosynthesis of Streptazone E and Camporidines4 Syntheses of the Streptazones and Abikoviromycin4.1 Retrosynthesis4.2 Results and Discussion5 Conclusion
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Liu H, Ottosen RN, Jennet KM, Svenningsen EB, Kristensen TF, Biltoft M, Jakobsen MR, Poulsen TB. Macrodiolide Diversification Reveals Broad Immunosuppressive Activity That Impairs the cGAS‐STING Pathway. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202105793] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Han Liu
- Department of Chemistry Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
- Current address: Department of Chemistry The University of Hong Kong Pokfulam Road Hong Kong SAR P. R. China
| | - Rasmus N. Ottosen
- Department of Chemistry Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| | - Kira M. Jennet
- Department of Chemistry Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| | - Esben B. Svenningsen
- Department of Chemistry Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| | - Tobias F. Kristensen
- Department of Chemistry Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
| | - Mette Biltoft
- STipe Therapeutics ApS, c/o The Kitchen Peter Sabroes Gade 7 8000 Aarhus C Denmark
| | - Martin R. Jakobsen
- STipe Therapeutics ApS, c/o The Kitchen Peter Sabroes Gade 7 8000 Aarhus C Denmark
- Department of Biomedicine Aarhus University Høegh-Guldbergs Gade 10 8000 Aarhus C Denmark
| | - Thomas B. Poulsen
- Department of Chemistry Aarhus University Langelandsgade 140 8000 Aarhus C Denmark
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Liu H, Ottosen RN, Jennet KM, Svenningsen EB, Kristensen TF, Biltoft M, Jakobsen MR, Poulsen TB. Macrodiolide Diversification Reveals Broad Immunosuppressive Activity That Impairs the cGAS-STING Pathway. Angew Chem Int Ed Engl 2021; 60:18734-18741. [PMID: 34124819 DOI: 10.1002/anie.202105793] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Indexed: 02/02/2023]
Abstract
The development of new immunomodulatory agents can impact various areas of medicine. In particular, compounds with the ability to modulate innate immunological pathways hold significant unexplored potential. Herein, we report a modular synthetic approach to the macrodiolide natural product (-)-vermiculine, an agent previously shown to possess diverse biological effects, including cytotoxic and immunosuppressive activity. The synthesis allows for a high degree of flexibility in modifying the macrocyclic framework, including the formation of all possible stereoisomers. In total, 18 analogues were prepared. Two analogues with minor structural modifications showed clearly enhanced cancer cell line selectivity and reduced toxicity. Moreover, these compounds possessed broad inhibitory activity against innate immunological pathways in human PBMCs, including the DNA-sensing cGAS-STING pathway. Initial mechanistic characterization suggests a surprising impairment of the STING-TBK1 interaction.
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Affiliation(s)
- Han Liu
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark.,Current address: Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong SAR, P. R. China
| | - Rasmus N Ottosen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Kira M Jennet
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Esben B Svenningsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Tobias F Kristensen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Mette Biltoft
- STipe Therapeutics ApS, c/o The Kitchen, Peter Sabroes Gade 7, 8000, Aarhus C, Denmark
| | - Martin R Jakobsen
- STipe Therapeutics ApS, c/o The Kitchen, Peter Sabroes Gade 7, 8000, Aarhus C, Denmark.,Department of Biomedicine, Aarhus University, Høegh-Guldbergs Gade 10, 8000, Aarhus C, Denmark
| | - Thomas B Poulsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
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Cordon MB, Jacobsen KM, Nielsen CS, Hjerrild P, Poulsen TB. Forward Chemical Genetic Screen for Oxygen-Dependent Cytotoxins Uncovers New Covalent Fragments that Target GPX4. Chembiochem 2021; 23:e202100253. [PMID: 34252249 DOI: 10.1002/cbic.202100253] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 07/09/2021] [Indexed: 11/09/2022]
Abstract
The identification of growth inhibitory compounds with the ability to selectively target the cellular oxygenation state may be of therapeutic interest. Here, a phenotypic screen of a covalent fragment library revealed diverse compounds containing propiolamide warheads with selective toxicity for liver cancer cells in normoxic conditions. Target identification and validation through CETSA and direct pulldown experiments demonstrated that several compounds target glutathione peroxidase 4 (GPX4) and induce ferroptotic cell death. Although being an oxidative cell death mechanism, ferroptosis can be induced also under hypoxic conditions. Prompted by the selective toxicity discovered in the screen, we mapped the oxygen-dependence of several ferroptosis-inducing compounds across three different cell lines. These studies revealed combinations with notable reductions in sensitivity under hypoxic conditions. These observations are mechanistically interesting and may be relevant for the use of ferroptosis-inducers as anti-cancer agents.
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Affiliation(s)
- Marie B Cordon
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Kristian M Jacobsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Cecilie S Nielsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Per Hjerrild
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
| | - Thomas B Poulsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000, Aarhus C, Denmark
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Poulsen TB. Total Synthesis of Natural Products Containing Enamine or Enol Ether Derivatives. Acc Chem Res 2021; 54:1830-1842. [PMID: 33660974 DOI: 10.1021/acs.accounts.0c00851] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Enamine and enol ethers are nucleophilic functional groups that are well known to most chemists. When enamine or enol ethers are present in natural products, they are nearly exclusively found as derivatives having a direct connection to electron-withdrawing groups for stabilization, and the resulting larger entities, such as enamides or enol acylates, can be further extended or modified in the framework of natural products. The restricted conformational space that is associated with even simple enamine and enol ether derivatives can be a strong determinant of the overall molecular structure, and the more polarized derivatives can endow some natural products with electrophilic properties and thus facilitate covalent interactions with biological targets.In this Account, I describe our efforts (published since 2016) to prepare natural products from several different classes that all feature enamine or enol ether derivatives as key functionalities. Our choice of targets has been guided by a desire to illuminate unknown biological mechanisms associated with the compounds or, alternatively, to improve upon known biological activities that appear to be promising from a biomedical perspective. In the present text, however, the exclusive focus will be on the syntheses.First, I will discuss the basic properties of the functional groups and briefly present a small collection of illustrative and inspirational examples from the literature for their construction in different complex settings. Next, I will provide an overview of our work on the macrocyclic APD-CLD natural products, rakicidin A and BE-43547A1, involving the development of an efficient macrocyclization strategy and the development of methods to construct the hallmark APD group: a modified enamide. The synthesis of the meroterpenoid strongylophorine-26 is discussed next, where we developed an oxidative quinone methoxylation to build a vinylogous ester group in the final step of the synthesis and employed FeCl3-mediated cascade reactions for the rapid assembly of the overall scaffold to enable a short semisynthesis from isocupressic acid. An efficient core scaffold assembly was also in focus in our synthesis of the alkaloid streptazone A with the signature enaminone system being assembled through a rhodium-catalyzed Pauson-Khand reaction. Sequential, site-selective redox manipulations were developed to arrive at strepatzone A and additional members of the natural product family. Finally, I discuss our work to prepare analogs of complex polyether ionophores featuring functionalized tetronic acids as cation-binding groups. A method for the construction of a suitably protected chloromethylidene-modified tetronate is presented which enabled its installation in the full structure through a C-acylation reaction. This work exemplifies how components of abundant polyether ionophores can be recycled and used to access new structures which may possess enhanced biological activities.
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Affiliation(s)
- Thomas B. Poulsen
- Department of Chemistry, Aarhus University, Langelandsgade 140, 8000 Aarhus C, Denmark
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Wang Y, Zhao Z, Lv S, Ding L, Wang XN, Chang J. Nonmetal-catalyzed hydroamination of ynamides with amines. Org Chem Front 2021. [DOI: 10.1039/d1qo01052b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A TfOH-catalyzed hydroamination of ynamides with primary and secondary amines under mild reaction conditions is described for the efficient synthesis of N-arylimines and ethene-1,1-diamines.
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Affiliation(s)
- Yanru Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Zhen Zhao
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Songkui Lv
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Lixia Ding
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Xiao-Na Wang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
| | - Junbiao Chang
- Collaborative Innovation Center of New Drug Research and Safety Evaluation, Henan Province, Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou 450001, P. R. China
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