1
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Tsukamoto T, Takahashi K, Murase N, Someya K, Sakata F, Yue T, Kusakabe T, Kato K. Synthesis of (-)-Monanchoradin A and (-)-Crambescin A2 392 Based on a Cyclization-Carbonylation-Cyclization Cascade. Org Lett 2024. [PMID: 39400067 DOI: 10.1021/acs.orglett.4c03158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2024]
Abstract
Syntheses of guanidino alkaloids (-)-monanchoradin A and (-)-crambescin A2 392 are described. The key feature of the syntheses is the cyclization-carbonylation-cyclization cascade of the optically active propargyl guanidine. The bicyclic guanidino cores bearing an asymmetric center and ester or carboxylic acid functionality were constructed in a single step. The carboxylic acid was then converted to (-)-monanchoradin A and (-)-crambescin A2 392.
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Affiliation(s)
- Takuya Tsukamoto
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Keisuke Takahashi
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Natsuki Murase
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Kyoka Someya
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Fujino Sakata
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Tianci Yue
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Taichi Kusakabe
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Keisuke Kato
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
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2
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Gillsch F, Mbui F, Bilitewski U, Schobert R. Syntheses and Antibacterial Evaluation of New Penicillium Metabolites Gregatins G and Thiocarboxylics C. Chem Biodivers 2023; 20:e202300181. [PMID: 36891992 DOI: 10.1002/cbdv.202300181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 03/08/2023] [Accepted: 03/08/2023] [Indexed: 03/10/2023]
Abstract
Two pairs of side-chain epimeric 3-methoxycarbonyl-dihydrofuran-4-ones with structures purported for thiocarboxylics C1/2 and gregatins G1/2 , isolated from Penicillium sp. Sb62, were synthesised for the first time in five steps and 17-25 % yield. Key steps were a Suzuki cross-coupling, a Yamaguchi esterification, and a base-induced Knoevenagel-type condensation. The optimum protecting group for the 10-OH group in the dienyl side-chain, orthogonal to necessary protecting groups on O-10 of the furanone, was found to be t-butyldiphenylsilyl (TBDPS). The specific rotations of our synthetic products deviated markedly from those reported for the natural isolates. In contrast to the isolates, the synthetic products were not active against Escherichia coli and Staphylococcus aureus bacteria.
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Affiliation(s)
- Franziska Gillsch
- Organic Chemistry Laboratory, University Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany
| | - Fredrick Mbui
- Department of Compound Profiling and Screening, Helmholtz Center for Infection Research GmbH, Inhoffenstrasse 7, 38124, Braunschweig, Germany
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P.O. Box 52428 -, 00200, Nairob, Kenya
| | - Ursula Bilitewski
- Department of Compound Profiling and Screening, Helmholtz Center for Infection Research GmbH, Inhoffenstrasse 7, 38124, Braunschweig, Germany
| | - Rainer Schobert
- Organic Chemistry Laboratory, University Bayreuth, Universitätsstrasse 30, 95440, Bayreuth, Germany
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3
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Gillsch F, Mbui F, Bilitewski U, Schobert R. Synthesis and Bioactivity of Thiocarboxylic A and Derivatives. JOURNAL OF NATURAL PRODUCTS 2022; 85:2828-2835. [PMID: 36416745 DOI: 10.1021/acs.jnatprod.2c00870] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The Penicillium metabolite thiocarboxylic A (1a) and three close analogues were synthesized in 14 steps. The stereogenic elements were installed via stereoselective Sharpless epoxidation, (E)-selective reduction of a dibromide, and a Suzuki cross coupling. Thiocarboxylic A (1a) was obtained in 6% overall yield. The synthetic product and the natural isolate differed markedly in their specific rotations and antibiotic activities against Escherichia coli and Staphylococcus aureus. This modular synthetic route should be flexible enough to allow the synthesis of other natural and non-natural 3-methoxycarbonyldihydrofuran-4-ones for biological studies.
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Affiliation(s)
- Franziska Gillsch
- Organic Chemistry Laboratory, University Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
| | - Fredrick Mbui
- Department of Compound Profiling and Screening, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany
- Department of Biochemistry and Biotechnology, Technical University of Kenya, P.O. Box 52428, 00200 Nairobi, Kenya
| | - Ursula Bilitewski
- Department of Compound Profiling and Screening, Helmholtz Centre for Infection Research GmbH, Inhoffenstrasse 7, 38124 Braunschweig, Germany
| | - Rainer Schobert
- Organic Chemistry Laboratory, University Bayreuth, Universitaetsstrasse 30, 95440 Bayreuth, Germany
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Takahashi K, Kudo S, Kawamura K, Kusakabe T, Kikkawa S, Azumaya I, Kato K. Synthesis of the Proposed Structure of Mohangic Acid C. Org Lett 2022; 24:3416-3420. [DOI: 10.1021/acs.orglett.2c01285] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Keisuke Takahashi
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Shunya Kudo
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Kiharu Kawamura
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Taichi Kusakabe
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Shoko Kikkawa
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Isao Azumaya
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
| | - Keisuke Kato
- Faculty of Pharmaceutical Sciences, Toho University, 2-2-1 Miyama, Funabashi, Chiba 274-8510, Japan
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Gillsch F, Zeng H, Bär SI, Schrey H, Schobert R. Synthesis and Bioactivity of Ophiofuranones A and B. J Org Chem 2022; 87:6520-6523. [PMID: 35471021 DOI: 10.1021/acs.joc.2c00521] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ophiofuranones A and B, metabolites of the fungus Ophiosphaerella korrae, were synthesized in 16 steps and 12%/22% yield. The stereogenic centers were established by Sharpless dihydroxylations and epoxidation, the 1,3-dienes via Wittig or HWE olefinations. The rings were closed through Knoevenagel-type condensation and lactonization. The ophiofuranones proved nontoxic at relevant concentrations against tumor cells, fibroblasts, and various bacteria and fungi. Ophiofuranone A and the monocyclic precursors 4 were weakly active against microbial biofilms.
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Affiliation(s)
- Franziska Gillsch
- Organic Chemistry Laboratory, University Bayreuth, Universitaetsstraße 30, 95440 Bayreuth, Germany
| | - Haoxuan Zeng
- Department of Microbial Drugs, Helmholtz Centre for Infection Research GmbH, Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Sofia I Bär
- Organic Chemistry Laboratory, University Bayreuth, Universitaetsstraße 30, 95440 Bayreuth, Germany
| | - Hedda Schrey
- Department of Microbial Drugs, Helmholtz Centre for Infection Research GmbH, Inhoffenstraße 7, 38124 Braunschweig, Germany
| | - Rainer Schobert
- Organic Chemistry Laboratory, University Bayreuth, Universitaetsstraße 30, 95440 Bayreuth, Germany
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6
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Ito Y, Kusakabe T, Dhage YD, Takahashi K, Sakata K, Sasai H, Kato K. Total Synthesis of (-)-Graminin A Based on Asymmetric Cyclization Carbonylation of Propargyl Acetate. J Org Chem 2019; 84:16268-16277. [PMID: 31789031 DOI: 10.1021/acs.joc.9b02886] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The first total synthesis of (-)-graminin A is described. Key features of our synthetic approach involve a palladium-catalyzed asymmetric cyclization carbonylation of prochiral propargylic acetate, conversion of the orthoester product into methyl 4-oxo-3-furancarboxylate, and copper complex-mediated aldol condensation of (+)-gregatin B bearing a diene moiety. A new synthesis of (+)-gregatin B and the first synthesis of (-)-graminin A were achieved.
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Affiliation(s)
- Yoichi Ito
- Faculty of Pharmaceutical Sciences , Toho University , 2-2-1 Miyama , Funabashi , Chiba 274-8510 , Japan
| | - Taichi Kusakabe
- Faculty of Pharmaceutical Sciences , Toho University , 2-2-1 Miyama , Funabashi , Chiba 274-8510 , Japan
| | - Yogesh Daulat Dhage
- Faculty of Pharmaceutical Sciences , Toho University , 2-2-1 Miyama , Funabashi , Chiba 274-8510 , Japan
| | - Keisuke Takahashi
- Faculty of Pharmaceutical Sciences , Toho University , 2-2-1 Miyama , Funabashi , Chiba 274-8510 , Japan
| | - Ken Sakata
- Faculty of Pharmaceutical Sciences , Toho University , 2-2-1 Miyama , Funabashi , Chiba 274-8510 , Japan
| | - Hiroaki Sasai
- The Institute of Scientific and Industrial Research (ISIR) , Osaka University , Mihogaoka, Ibaraki-shi , Osaka 567-0047 , Japan
| | - Keisuke Kato
- Faculty of Pharmaceutical Sciences , Toho University , 2-2-1 Miyama , Funabashi , Chiba 274-8510 , Japan
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7
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Yao G, Joswig J, Keller BG, Süssmuth RD. Total Synthesis of the Death Cap Toxin Phalloidin: Atropoisomer Selectivity Explained by Molecular‐Dynamics Simulations. Chemistry 2019; 25:8030-8034. [DOI: 10.1002/chem.201901888] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Indexed: 12/22/2022]
Affiliation(s)
- Guiyang Yao
- Institut für ChemieTechnische Universität Berlin Strasse des 17. Juni 124 10623 Berlin Germany
| | - Jan‐Oliver Joswig
- Department of Biology, Chemistry, PharmacyFreie Universität Berlin Takustrasse 3 14195 Berlin Germany
| | - Bettina G. Keller
- Department of Biology, Chemistry, PharmacyFreie Universität Berlin Takustrasse 3 14195 Berlin Germany
| | - Roderich D. Süssmuth
- Institut für ChemieTechnische Universität Berlin Strasse des 17. Juni 124 10623 Berlin Germany
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8
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Saito T, Kutsumura N, Numata K, Mosaki S. Total Synthesis of Haplacutines B and C. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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9
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Heravi MM, Mohammadkhani L. Recent applications of Stille reaction in total synthesis of natural products: An update. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.05.018] [Citation(s) in RCA: 48] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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10
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Affiliation(s)
- Lei Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Zhuang Chen
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Xiwu Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
| | - Yanxing Jia
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, 38 Xueyuan Road, Beijing 100191, China
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11
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Taheri Kal Koshvandi A, Heravi MM, Momeni T. Current Applications of Suzuki–Miyaura Coupling Reaction in The Total Synthesis of Natural Products: An update. Appl Organomet Chem 2018. [DOI: 10.10.1002/aoc.4210] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
| | | | - Tayebeh Momeni
- Department of ChemistryAlzahra University Vanak Tehran Iran
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12
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Taheri Kal Koshvandi A, Heravi MM, Momeni T. Current Applications of Suzuki–Miyaura Coupling Reaction in The Total Synthesis of Natural Products: An update. Appl Organomet Chem 2018. [DOI: 10.1002/aoc.4210] [Citation(s) in RCA: 99] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
| | | | - Tayebeh Momeni
- Department of ChemistryAlzahra University Vanak Tehran Iran
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13
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Ivanov KL, Vatsouro IM, Bezzubov SI, Melnikov MY, Budynina EM. Domino construction of a bullataketal core via double bond cleavage in activated dihydrofurans. Org Chem Front 2018. [DOI: 10.1039/c8qo00132d] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
A new rapid approach to structurally challenging and biologically relevant methanobenzodioxepines was developed via a Brønsted acid-triggered domino transformation of 3-carbonyl-4,5-dihydrofurans, substituted with MOM-protected o-hydroxyaryls at the C4 atom.
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Affiliation(s)
| | - Ivan M. Vatsouro
- Department of Chemistry
- Lomonosov Moscow State University
- Moscow 119991
- Russia
| | - Stanislav I. Bezzubov
- Kurnakov Institute of General and Inorganic Chemistry
- Russian Academy of Sciences
- Moscow 119991
- Russia
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14
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Inagaki S, Sato A, Sato H, Tamura S, Kawano T. Synthesis of 2-substituted 4,5-dihydro-4-oxo-3-furancarboxylates using acylative intramolecular cyclization of sulfonium salts. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.11.035] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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15
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Kim SY, Roh HJ, Seo DY, Ryu JY, Lee J, Kim JN. Base-catalyzed one-pot synthesis of dispiro-1,3-dioxolane bisoxindoles from N-methylisatin and methyl propiolate. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.01.055] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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16
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17
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Kuilya TK, Goswami RK. Total synthesis of cananginone C and structural revision of debilisone A. Org Biomol Chem 2016; 14:8789-8799. [PMID: 27714187 DOI: 10.1039/c6ob01671e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A short, convergent and general strategy for stereoselective total synthesis of biologically active α-substituted γ-hydroxymethyl γ-lactone based natural products cananginone C and debilisone A has been developed. The salient features of this synthesis include Cadiot-Chodkiewicz coupling, Evans allylation, Sharpless asymmetric dihydroxylation and γ-lactonization. The originally proposed structure of debilisone A has been revised.
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Affiliation(s)
- Tapan Kumar Kuilya
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
| | - Rajib Kumar Goswami
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata-700032, India.
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18
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Guerrero-Vásquez GA, Galarza FAD, Molinillo JMG, Andrade CKZ, Macías FA. Enantioselective Total Syntheses of ( R)- and ( S)-Naphthotectone, and Stereochemical Assignment of the Natural Product. European J Org Chem 2016. [DOI: 10.1002/ejoc.201501479] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Wang WG, Li A, Yan BC, Niu SB, Tang JW, Li XN, Du X, Challis GL, Che Y, Sun HD, Pu JX. LC-MS-Guided Isolation of Penicilfuranone A: A New Antifibrotic Furancarboxylic Acid from the Plant Endophytic Fungus Penicillium sp. sh18. JOURNAL OF NATURAL PRODUCTS 2016; 79:149-155. [PMID: 26677752 DOI: 10.1021/acs.jnatprod.5b00814] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Penicilfuranone A (1), a novel furancarboxylic acid, and its proposed biosynthetic precursor, gregatin A (2), were isolated from the cultures of the fungus Penicillium sp. sh18 endophytic to the stems of Isodon eriocalyx var. laxiflora guided by HPLC-MS. X-ray crystallography was applied to the structure determination of furancarboxylic acid for the first time, allowing unambiguous assignment of 1. Penicilfuranone A displays a significant antifibrotic effect in activated hepatic stellate cells via negative regulation of transforming growth factor-β (TGF-β)/Smad signaling.
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Affiliation(s)
- Wei-Guang Wang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
| | - Ao Li
- College of Pharmacy and Bioengineering, Chongqing University of Technology , Chongqing 400054, People's Republic of China
| | - Bing-Chao Yan
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Shu-Bin Niu
- State Key Laboratory of Toxicology & Medical Countermeasures, Beijing Institute of Pharmacology & Toxicology , Beijing 100850, People's Republic of China
| | - Jian-Wei Tang
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
- University of Chinese Academy of Sciences , Beijing 100049, People's Republic of China
| | - Xiao-Nian Li
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
| | - Xue Du
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
| | - Gregory L Challis
- Department of Chemistry, University of Warwick , Coventry CV4 7AL, United Kingdom
| | - Yongsheng Che
- State Key Laboratory of Toxicology & Medical Countermeasures, Beijing Institute of Pharmacology & Toxicology , Beijing 100850, People's Republic of China
| | - Han-Dong Sun
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
| | - Jian-Xin Pu
- State Key Laboratory of Phytochemistry and Plant Resources in West China, Kunming Institute of Botany, Chinese Academy of Sciences , Kunming 650201, Yunnan, People's Republic of China
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20
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Sánchez-Díez E, Fernández M, Uria U, Reyes E, Carrillo L, Vicario JL. Enantioselective Synthesis of Tertiary Propargylic Alcohols under N-Heterocyclic Carbene Catalysis. Chemistry 2015; 21:8384-8. [PMID: 25907587 DOI: 10.1002/chem.201501044] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2015] [Indexed: 11/08/2022]
Abstract
A straightforward procedure to carry out the enantioselective benzoin reaction between aldehydes and ynones by employing a chiral N-heterocyclic carbene (NHC) as catalyst was developed. Under the optimized reaction conditions, these ynones undergo a clean and selective 1,2-addition with the catalytically generated Breslow intermediate, not observing any byproduct arising from competitive Stetter-type reactivity. This procedure allows the preparation of tertiary alkynyl carbinols as highly enantioenriched materials, which have the remarkable potential to be used as chiral building blocks in organic synthesis.
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Affiliation(s)
- Eduardo Sánchez-Díez
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao (Spain), Fax: (+34) 94-601-2748
| | - Maitane Fernández
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao (Spain), Fax: (+34) 94-601-2748
| | - Uxue Uria
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao (Spain), Fax: (+34) 94-601-2748
| | - Efraim Reyes
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao (Spain), Fax: (+34) 94-601-2748.
| | - Luisa Carrillo
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao (Spain), Fax: (+34) 94-601-2748
| | - Jose L Vicario
- Department of Organic Chemistry II, University of the Basque Country (UPV/EHU), P.O. Box 644, 48080 Bilbao (Spain), Fax: (+34) 94-601-2748.
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21
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Weber F, Brückner R. Asymmetric Dihydroxylation of Esters and Amides of Methacrylic, Tiglic, and Angelic Acid: No Exception to the Sharpless Mnemonic! European J Org Chem 2015. [DOI: 10.1002/ejoc.201403622] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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22
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Weber F, Brückner R. Total Syntheses of the Dihydrofuranonecarboxylate Natural Products Gregatin B and E: Gram-Scale Synthesis of (+)-Gregatin B and Unambiguous Assignment of the Stereostructure of (+)-Gregatin E. Org Lett 2014; 16:6428-31. [DOI: 10.1021/ol5032602] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Fabian Weber
- Institut für Organische
Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg im Breisgau, Germany
| | - Reinhard Brückner
- Institut für Organische
Chemie, Albert-Ludwigs-Universität, Albertstraße 21, 79104 Freiburg im Breisgau, Germany
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