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Huynh NO, Hodík T, Krische MJ. Enantioselective Transfer Hydrogenative Cycloaddition Unlocks the Total Synthesis of SF2446 B3: An Aglycone of Arenimycin and SF2446 Type II Polyketide Antibiotics. J Am Chem Soc 2023; 145:17461-17467. [PMID: 37494281 PMCID: PMC10443208 DOI: 10.1021/jacs.3c06225] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/28/2023]
Abstract
The first total synthesis and structure validation of an arenimycin/SF2446 type II polyketide is described, as represented by de novo construction of SF2446 B3, the aglycone shared by this family of type II polyketides. Ruthenium-catalyzed α-ketol-benzocyclobutenone [4 + 2] cycloaddition, which occurs via successive stereoablation-stereoregeneration, affects a double dynamic kinetic asymmetric transformation wherein two racemic starting materials combine to form the congested angucycline bay region with control of regio-, diastereo-, and enantioselectivity. This work represents the first application of transfer hydrogenative cycloaddition and enantioselective intermolecular metal-catalyzed C-C bond activation in target-oriented synthesis.
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Affiliation(s)
- Nancy O Huynh
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Tomáš Hodík
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
| | - Michael J Krische
- Department of Chemistry, University of Texas at Austin, 105 E 24th Street, Austin, Texas 78712, United States
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Rojas AH, Lafuente L, Echeverría GA, Piro OE, Vetere V, Ponzinibbio A. Structure investigation on a novel 2-halo-2,3-unsaturated-N-galactoside, NMR and X-ray diffraction of a monoclinic multidomain crystal. Carbohydr Res 2021; 510:108457. [PMID: 34638084 DOI: 10.1016/j.carres.2021.108457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 10/04/2021] [Accepted: 10/05/2021] [Indexed: 10/20/2022]
Abstract
Single crystal X-ray and NMR investigations on multidomain structured N-(4,6-di-O-acetyl-2,3-dideoxy-α-D-threo-hex-2-en-2-iodo-pyranosyl)-methylsulfonamide are reported. This is the first crystallographic diffraction data report related to a 2-halo-2,3-unsaturated galactoside derivative. A complete structural study, including conformations and crystal packing, was performed by analyzing the spectroscopic data in solid state (XRD) and in solution (NMR).
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Affiliation(s)
- A H Rojas
- Centro de Estudio de Compuestos Orgánicos, CEDECOR (CIC, UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, 1900, La Plata, Argentina
| | - L Lafuente
- Centro de Estudio de Compuestos Orgánicos, CEDECOR (CIC, UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, 1900, La Plata, Argentina
| | - G A Echeverría
- Instituto de Física La Plata, IFLP (CONICET, UNLP), Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 67, 1900, La Plata, Argentina
| | - O E Piro
- Instituto de Física La Plata, IFLP (CONICET, UNLP), Departamento de Física, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CC 67, 1900, La Plata, Argentina
| | - V Vetere
- Centro de Investigación y Desarrollo en Ciencias Aplicadas "Dr. Jorge J. Ronco", CINDECA (CONICET, UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Calle 47 Nº 257, 1900, La Plata, Argentina.
| | - A Ponzinibbio
- Centro de Estudio de Compuestos Orgánicos, CEDECOR (CIC, UNLP), Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, 47 y 115, 1900, La Plata, Argentina.
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Scheibenzuber S, Hoffmann T, Effenberger I, Schwab W, Asam S, Rychlik M. Enzymatic Synthesis of Modified Alternaria Mycotoxins Using a Whole-Cell Biotransformation System. Toxins (Basel) 2020; 12:toxins12040264. [PMID: 32326012 PMCID: PMC7232528 DOI: 10.3390/toxins12040264] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2020] [Revised: 04/15/2020] [Accepted: 04/17/2020] [Indexed: 02/06/2023] Open
Abstract
Reference standards for Alternaria mycotoxins are rarely available, especially the modified mycotoxins alternariol-3-glucoside (AOH-3-G), alternariol-9-glucoside (AOH-9-G), and alternariol monomethylether-3-glucoside (AME-3-G). To obtain these three glucosides as analytical standards for method development and method validation, alternariol and alternariol monomethylether were enzymatically glycosylated in a whole-cell biotransformation system using a glycosyltransferase from strawberry (Fragaria x ananassa), namely UGT71A44, expressed in Escherichia coli (E. coli). The formed glucosides were isolated, purified, and structurally characterized. The exact amount of the isolated compounds was determined using high-performance liquid chromatography with UV-detection (HPLC-UV) and quantitative nuclear resonance spectroscopy (qNMR). This method has proved to be highly effective with biotransformation rates of 58% for AOH-3-G, 5% for AOH-9-G, and 24% for AME-3-G.
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Affiliation(s)
- Sophie Scheibenzuber
- Chair of Analytical Food Chemistry, Technical University of Munich, Maximus-von-Imhof Forum 2, 85354 Freising, Germany; (S.S.); (S.A.)
| | - Thomas Hoffmann
- Biotechnology of Natural Products, Technical University of Munich, Liesel-Beckmann-Straße 1, 85354 Freising, Germany; (T.H.); (W.S.)
| | | | - Wilfried Schwab
- Biotechnology of Natural Products, Technical University of Munich, Liesel-Beckmann-Straße 1, 85354 Freising, Germany; (T.H.); (W.S.)
| | - Stefan Asam
- Chair of Analytical Food Chemistry, Technical University of Munich, Maximus-von-Imhof Forum 2, 85354 Freising, Germany; (S.S.); (S.A.)
| | - Michael Rychlik
- Chair of Analytical Food Chemistry, Technical University of Munich, Maximus-von-Imhof Forum 2, 85354 Freising, Germany; (S.S.); (S.A.)
- Correspondence:
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Cui CH, Fu Y, Jeon BM, Kim SC, Im WT. Novel enzymatic elimination method for the chromatographic purification of ginsenoside Rb 3 in an isomeric mixture. J Ginseng Res 2019; 44:784-789. [PMID: 33192121 PMCID: PMC7655484 DOI: 10.1016/j.jgr.2019.08.003] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2018] [Revised: 05/22/2019] [Accepted: 08/12/2019] [Indexed: 01/09/2023] Open
Abstract
Background The separation of isomeric compounds from a mixture is a recurring problem in chemistry and phytochemistry research. The purification of pharmacologically active ginsenoside Rb3 from ginseng extracts is limited by the co-existence of its isomer Rb2. The aim of the present study was to develop an enzymatic elimination-combined purification method to obtain pure Rb3 from a mixture of isomers. Methods To isolate Rb3 from the isomeric mixture, a simple enzymatic selective elimination method was used. A ginsenoside-transforming glycoside hydrolase (Bgp2) was employed to selectively hydrolyze Rb2 into ginsenoside Rd. Ginsenoside Rb3 was then efficiently separated from the mixture using a traditional chromatographic method. Results Chromatographic purification of Rb3 was achieved using this novel enzymatic elimination-combined method, with 58.6-times higher yield and 13.1% less time than those of the traditional chromatographic method, with a lower minimum column length for purification. The novelty of this study was the use of a recombinant glycosidase for the selective elimination of the isomer. The isolated ginsenoside Rb3 can be used in further pharmaceutical studies. Conclusions Herein, we demonstrated a novel enzymatic elimination-combined purification method for the chromatographic purification of ginsenoside Rb3. This method can also be applied to purify other isomeric glycoconjugates in mixtures.
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Affiliation(s)
- Chang-Hao Cui
- The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu, China.,Intelligent Synthetic Biology Center, Daejeon, Republic of Korea
| | - Yaoyao Fu
- The Key Laboratory of Biotechnology for Medicinal Plant of Jiangsu Province, Jiangsu Normal University, Xuzhou, Jiangsu, China
| | - Byeong-Min Jeon
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Sun-Chang Kim
- Intelligent Synthetic Biology Center, Daejeon, Republic of Korea.,Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea.,KAIST Institute for Biocentury, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Wan-Taek Im
- Department of Biological Sciences, Hankyong National University, Anseong City, Kyonggi-Do, Republic of Korea
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Szeja W, Grynkiewicz G, Rusin A. Isoflavones, their Glycosides and Glycoconjugates. Synthesis and Biological Activity. CURR ORG CHEM 2016; 21:218-235. [PMID: 28553156 PMCID: PMC5427819 DOI: 10.2174/1385272820666160928120822] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Revised: 07/20/2016] [Accepted: 09/22/2016] [Indexed: 11/22/2022]
Abstract
Glycosylation of small biologically active molecules, either of natural or synthetic origin, has a profound impact on their solubility, stability, and bioactivity, making glycoconjugates attractive compounds as therapeutic agents or nutraceuticals. A large proportion of secondary metabolites, including flavonoids, occur in plants as glycosides, which adds to the molecular diversity that is much valued in medicinal chemistry studies. The subsequent growing market demand for glycosidic natural products has fueled the development of various chemical and biotechnological methods of glycosides preparation. The review gives an extensive overview of the processes of the synthesis of isoflavones and discusses recently developed major routes towards isoflavone-sugar formation processes. Special attention is given to the derivatives of genistein, the main isoflavone recognized as a useful lead in several therapeutic categories, with particular focus on anticancer drug design. The utility of chemical glycosylations as well as glycoconjugates preparation is discussed in some theoretical as well as practical aspects. Since novel approaches to chemical glycosylations and glycoconjugations are abundant and many of them proved suitable for derivatization of polyphenols a new body of evidence has emerged, indicating that sugar moiety can play a much more significant role, when attached to a pharmacophore, then being a mere “solubilizer”. In many cases, it has been demonstrated that semisynthetic glycoconjugates are much more potent cytostatic and cytotoxic agents than reference isoflavones. Moreover, the newly designed glycosides or glycoside mimics can act through different mechanisms than the parent active molecule.
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Affiliation(s)
- Wiesław Szeja
- Silesian Technical University, Department of Chemistry, Krzywoustego 4, 44-100 Gliwice, Poland
| | | | - Aleksandra Rusin
- Maria Sklodowska-Curie Memorial Cancer Center and Institute of Oncology, Gliwice Branch, Wybrzeze AK 15, 44-100 Gliwice, Poland
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Zhang L, Li L, Bai S, Zhou X, Wang P, Li M. Access to Diosgenyl Glycoconjugates via Gold(I)-Catalyzed Etherification of Diosgen-3-yl ortho-Hexynylbenzoate. Org Lett 2016; 18:6030-6033. [DOI: 10.1021/acs.orglett.6b02963] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Li Zhang
- Key
Laboratory of Marine Medicine, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P. R. China
| | - Linfeng Li
- Department
of Pharmaceutical Sciences, Skaggs School of Pharmacy and Pharmaceutical
Sciences, University of Colorda Anschutz Medical Campus, Aurora, Colorado 80045, United States
| | - Shujin Bai
- Key
Laboratory of Marine Medicine, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P. R. China
| | - Xin Zhou
- Key
Laboratory of Marine Medicine, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P. R. China
| | - Peng Wang
- Key
Laboratory of Marine Medicine, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P. R. China
| | - Ming Li
- Key
Laboratory of Marine Medicine, Chinese Ministry of Education, School
of Medicine and Pharmacy, Ocean University of China, Qingdao, Shandong 266003, P. R. China
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