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Fukuyama Y, Kubo M, Harada K. Neurotrophic Natural Products. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2024; 123:1-473. [PMID: 38340248 DOI: 10.1007/978-3-031-42422-9_1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/12/2024]
Abstract
Neurotrophins (NGF, BDNF, NT3, NT4) can decrease cell death, induce differentiation, as well as sustain the structure and function of neurons, which make them promising therapeutic agents for the treatment of neurodegenerative disorders. However, neurotrophins have not been very effective in clinical trials mostly because they cannot pass through the blood-brain barrier owing to being high-molecular-weight proteins. Thus, neurotrophin-mimic small molecules, which stimulate the synthesis of endogenous neurotrophins or enhance neurotrophic actions, may serve as promising alternatives to neurotrophins. Small-molecular-weight natural products, which have been used in dietary functional foods or in traditional medicines over the course of human history, have a great potential for the development of new therapeutic agents against neurodegenerative diseases such as Alzheimer's disease. In this contribution, a variety of natural products possessing neurotrophic properties such as neurogenesis, neurite outgrowth promotion (neuritogenesis), and neuroprotection are described, and a focus is made on the chemistry and biology of several neurotrophic natural products.
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Affiliation(s)
- Yoshiyasu Fukuyama
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, 770-8514, Japan.
| | - Miwa Kubo
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, 770-8514, Japan
| | - Kenichi Harada
- Faculty of Pharmaceutical Sciences, Tokushima Bunri University, Tokushima, 770-8514, Japan
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2
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Cinnamomeoventrolide - Double Bond Regioisomerism in Frog Semiochemicals. J Chem Ecol 2022; 48:531-545. [PMID: 35804278 PMCID: PMC9375755 DOI: 10.1007/s10886-022-01370-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Revised: 06/02/2022] [Accepted: 06/11/2022] [Indexed: 11/16/2022]
Abstract
Frogs of the families Mantellinae and Hyperoliidae possess male specific femoral or gular glands that are used during courtship. These glands release volatile compounds, e. g. the macrocyclic lactone gephyromantolide A (2,6,10-trimethyl-6-undecen-11-olide) in the case of Gephyromantis boulengeri (Mantellinae). During the analysis of the volatiles of Hyperolius cinnamomeoventris (Hyperoliidae) we detected an unknown compound A, which we called cinnamomeoventrolide, whose mass spectrum showed high similarity with the spectrum of gephyromantolide A. Nevertheless, slight spectral differences led to the proposal of a regioisomer of gephyromantolide A as a structure for A, 2,6,10-trimethyl-5-undecen-11-olide. A versatile synthesis of this compound was developed to allow access to all four stereoisomers from a single chiral starting material, the so-called (S)-Roche ester, using ring-closing metathesis as a key step. With these stereoisomers, the absolute configuration of the natural product was established to have the (2R,10S)-configuration by GC on a chiral phase. The configuration of natural gephyromantolide A is the opposite. Both frogs seem to use a similar biosynthetic pathway to access the target compounds, differing in the stereochemistry of the reduction steps, and requiring an additional isomerization in case of G. boulengeri. This unique regioisomeric differentiation of double bonds in semiochemicals has so far only been observed in insects. The compounds are likely to play a role in species-recognition of the frogs.
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Drescher C, Brückner R. Stereostructure Clarifying Total Synthesis of the (Polyenoyl)tetramic Acid Militarinone B. A Highly Acid-Labile N-Protecting Group for Amides†. Org Lett 2021; 23:6194-6199. [PMID: 34324347 DOI: 10.1021/acs.orglett.1c01652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The 5S, 8'R, and 10'R configurations of militarinone B (3), which is a natural product from Paecilomyces militaris, should equal those in its biosynthetic precursor, militarinone C. The configuration at C-1' emerged from syntheses of the militarinone B candidates 1''S- and 1''R-(5S,8'R,10'R)-3 from the building blocks 9, 11, 14, and 15a while introducing TMB as a more acid-labile N-protecting group for β-ketoamides than DMB. Comparisons of 1''S- and 1''R-(5S,8'R,10'R)-3 with natural militarinone B (3; reisolated from Nature) revealed identity versus distinctness.
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Affiliation(s)
- Christian Drescher
- Institut für Organische Chemie, Albert-Ludwigs-Universität, Albertstr. 21, D-79104 Freiburg, Germany
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert-Ludwigs-Universität, Albertstr. 21, D-79104 Freiburg, Germany
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Beemelmanns C, Roman D, Sauer M. Applications of the Horner–Wadsworth–Emmons Olefination in Modern Natural Product Synthesis. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/a-1493-6331] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
AbstractThe Horner–Wadsworth–Emmons (HWE) reaction is one of the most reliable olefination reaction and can be broadly applied in organic chemistry and natural product synthesis with excellent selectivity. Within the last few years HWE reaction conditions have been optimized and new reagents developed to overcome challenges in the total syntheses of natural products. This review highlights the application of HWE olefinations in total syntheses of structurally different natural products covering 2015 to 2020. Applied HWE reagents and reactions conditions are highlighted to support future synthetic approaches and serve as guideline to find the best HWE conditions for the most complicated natural products.1 Introduction and Historical Background2 Applications of HWE2.1 Cyclization by HWE Reactions2.2.1 Formation of Medium- to Larger-Sized Rings2.2.2 Formation of Small- to Medium-Sized Rings2.3 Synthesis of α,β-Unsaturated Carbonyl Groups2.4 Synthesis of Substituted C=C Bonds2.5 Late-Stage Modifications by HWE Reactions2.6 HWE Reactions on Solid Supports2.7 Synthesis of Poly-Conjugated C=C Bonds2.8 HWE-Mediated Coupling of Larger Building Blocks2.9 Miscellaneous3 Summary and Outlook
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Kamauchi H, Kimura Y, Ushiwatari M, Suzuki M, Seki T, Takao K, Sugita Y. Synthesis and antifungal activity of polycyclic pyridone derivatives with anti-hyphal and biofilm formation activity against Candida albicans. Bioorg Med Chem Lett 2021; 37:127845. [PMID: 33571649 DOI: 10.1016/j.bmcl.2021.127845] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 01/22/2021] [Accepted: 01/29/2021] [Indexed: 10/22/2022]
Abstract
Thirty-five pyridone derivatives were synthesized, with derivatization conducted on polycyclic pyridone scaffolds, including cis- or trans-oxydecalin and other cyclic structures, by domino-Knoevenagel-electrocyclic reactions. The anti-fungal activities of the synthesized compounds were tested against Candida albicans. Ten compounds inhibited hyphal formation without inhibiting growth. Pyridones with anti-hyphal formation activity (4c, 6d, 12a and 12c) were tested for their ability to inhibit biofilm formation. Compound 6d showed both anti-hyphal and biofilm inhibition activity.
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Affiliation(s)
- Hitoshi Kamauchi
- Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan.
| | - Yu Kimura
- Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan
| | - Mikoto Ushiwatari
- Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan
| | - Mitsuaki Suzuki
- Department of Chemistry, Faculty of Science, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan
| | - Taishi Seki
- Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan
| | - Koichi Takao
- Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan
| | - Yoshiaki Sugita
- Department of Pharmaceutical Sciences, Faculty of Pharmacy and Pharmaceutical Sciences, Josai University, 1-1 Keyaki-dai, Sakado, Saitama 350-0295, Japan
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Ilazi A, Huang B, de Almeida Campos V, Gademann K. Synthesis of Colibactin Pyrrolidono[3,4- d]pyridones via Regioselective C(sp 3)-H Activation. Org Lett 2020; 22:6858-6862. [PMID: 32815372 DOI: 10.1021/acs.orglett.0c02385] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The synthesis of pyrrolidono[3,4-d]pyridones of relevance to putative genotoxic colibactin structures featuring a doubly conjugated 1,6-Michael acceptor system is reported. We investigated and implemented a highly selective Pd-catalyzed C(sp3)-H activation reaction as a key step and further functionalized the pyridone core. Evaluating the role of this structural unit of relevance to colibactin, we found that this structure displayed a high degree of stability toward both acidic conditions and nucleophiles.
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Affiliation(s)
- Agron Ilazi
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH 8057 Zürich, Switzerland
| | - Bin Huang
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH 8057 Zürich, Switzerland
| | - Valery de Almeida Campos
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH 8057 Zürich, Switzerland
| | - Karl Gademann
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH 8057 Zürich, Switzerland
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Xiong X, Wu Y, Liu B. Synthesis and Configuration of a p
-Aminoacetophenonic Acid Isolated from Endophyte of the Mangrove Plant Kandel candel. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000837] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Xin Xiong
- School of Materials Science and Engineering and Key Laboratory of Green Chemical Technology of College of Heilongjiang Province; College of Chemical and Environmental Engineering; Harbin University of Science and Technology; 150040 Harbin China
- State Key Laboratory of Bioorganic and Natural Products Chemistry; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road 200032 Shanghai China
| | - Yikang Wu
- State Key Laboratory of Bioorganic and Natural Products Chemistry; Center for Excellence in Molecular Synthesis; Shanghai Institute of Organic Chemistry; Chinese Academy of Sciences; 345 Lingling Road 200032 Shanghai China
| | - Bo Liu
- School of Materials Science and Engineering and Key Laboratory of Green Chemical Technology of College of Heilongjiang Province; College of Chemical and Environmental Engineering; Harbin University of Science and Technology; 150040 Harbin China
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Valeev RF, Sunagatullina GR, Miftakhov MS. Synthesis and Isomerization of the 2-Methyl Enal Fragment of Acyclic Precursors to 9,11-Diene Analogs of Epothilones. RUSSIAN JOURNAL OF ORGANIC CHEMISTRY 2020. [DOI: 10.1134/s1070428020070039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Drescher C, Keller M, Potterat O, Hamburger M, Brückner R. Structure-Elucidating Total Synthesis of the (Polyenoyl)tetramic Acid Militarinone C§. Org Lett 2020; 22:2559-2563. [PMID: 32191484 DOI: 10.1021/acs.orglett.0c00431] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The (polyenoyl)tetramic acid militarinone C (1) heads a family of seven members. Before our work, the configuration of C-5 was unknown whereas the configurations of C-8' and C-10' were either (R,R) or (S,S). We synthesized the four stereoisomers of constitution 1, which conform with these insights. This included cross-coupling both enantiomers of the western building block (8) with both enantiomers of the eastern building block (9). The specific rotations of the resulting 1 isomers suggested that natural 1 is configured like the coupling partners (S)-8 and (R,R)-9. This conclusion was corroborated by degrading natural 1 to alcohol 35 and by proving its configurational identity with synthetic (R,R)-35.
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Affiliation(s)
- Christian Drescher
- Institut für Organische Chemie, Albert-Ludwigs-Universität, Albertstrasse 21, D-79104 Freiburg, Germany
| | - Morris Keller
- Pharmazeutische Biologie, Universität Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Olivier Potterat
- Pharmazeutische Biologie, Universität Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Matthias Hamburger
- Pharmazeutische Biologie, Universität Basel, Klingelbergstrasse 50, 4056 Basel, Switzerland
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert-Ludwigs-Universität, Albertstrasse 21, D-79104 Freiburg, Germany
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Hu Z, Zhang M, Zhou Q, Xu X, Tang B. Domino synthesis of fully substituted pyridines by silver-catalyzed chemoselective hetero-dimerization of isocyanides. Org Chem Front 2020. [DOI: 10.1039/c9qo01333d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A silver-catalyzed hetero-dimerization of various vinyl isocyanides with isocyanoacetamides has been developed for the efficient and practical synthesis of fully substituted pyridines in a single operation.
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Affiliation(s)
- Zhongyan Hu
- College of Chemistry
- Chemical Engineering and Materials Science
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Shandong Normal University
| | - Mingyue Zhang
- College of Chemistry
- Chemical Engineering and Materials Science
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Shandong Normal University
| | - Qinghua Zhou
- College of Chemistry
- Chemical Engineering and Materials Science
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Shandong Normal University
| | - Xianxiu Xu
- College of Chemistry
- Chemical Engineering and Materials Science
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Shandong Normal University
| | - Bo Tang
- College of Chemistry
- Chemical Engineering and Materials Science
- Key Laboratory of Molecular and Nano Probes
- Ministry of Education
- Shandong Normal University
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Bruckner S, Weise M, Schobert R. Synthesis of the Entomopathogenic Fungus Metabolites Militarinone C and Fumosorinone A. J Org Chem 2018; 83:10805-10812. [DOI: 10.1021/acs.joc.8b01530] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Sebastian Bruckner
- Department of Chemistry, University Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
| | - Marie Weise
- Department of Chemistry, University Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
| | - Rainer Schobert
- Department of Chemistry, University Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
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Sengupta S, Bae M, Oh DC, Dash U, Kim HJ, Song WY, Shin I, Sim T. Structural Revision of Baulamycin A and Structure-Activity Relationships of Baulamycin A Derivatives. J Org Chem 2017; 82:12947-12966. [PMID: 28903000 DOI: 10.1021/acs.joc.7b01719] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Total synthesis of the proposed structure of baulamycin A was performed. The spectral properties of the synthetic compound differ from those reported for the natural product. On the basis of comprehensive NMR study, we proposed two other possible structures for natural baulamycin A. Total syntheses of these two substances were performed, which enabled assignment of the correct structure of baulamycin A. Key features of the convergent and fully stereocontrolled route include Evans Aldol and Brown allylation reactions to construct the left fragment, a prolinol amide-derived alkylation/desymmetrization to install the methyl-substituted centers in the right fragment, and finally, a Carreira alkynylation to join both fragments. In addition, we have determined the inhibitory activities of novel baulamycin A derivatives against the enzyme SbnE. This SAR study provides useful insight into the design of novel SbnE inhibitors that overcome the drug resistance of pathogens, which cause life-threatening infections.
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Affiliation(s)
- Sandip Sengupta
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST) , 5 Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | - Munhyung Bae
- Natural Products Research Institute, College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Dong-Chan Oh
- Natural Products Research Institute, College of Pharmacy, Seoul National University , 1 Gwanak-ro, Gwanak-gu, Seoul 08826, Republic of Korea
| | - Uttam Dash
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST) , 5 Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
| | | | | | | | - Taebo Sim
- Chemical Kinomics Research Center, Korea Institute of Science and Technology (KIST) , 5 Hwarangro 14-gil, Seongbuk-gu, Seoul 02792, Republic of Korea
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Affiliation(s)
- Vivek K. Mishra
- Institut für Organische
Chemie, Eberhard Karls Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
| | - P. C. Ravikumar
- Institut für Organische
Chemie, Eberhard Karls Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
| | - Martin E. Maier
- Institut für Organische
Chemie, Eberhard Karls Universität Tübingen, Auf
der Morgenstelle 18, 72076 Tübingen, Germany
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