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Borrmann R, Zetschok D, Wennemers H. Decarboxylative Organocatalyzed Aldol-Type Addition Reaction of Chloroacetate Surrogates. Org Lett 2022; 24:8683-8687. [DOI: 10.1021/acs.orglett.2c03568] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Affiliation(s)
- Rüdiger Borrmann
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog Weg 3, CH-8093 Zurich, Switzerland
| | - Dominik Zetschok
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog Weg 3, CH-8093 Zurich, Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog Weg 3, CH-8093 Zurich, Switzerland
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Zhou L, Zhang H, Li C, De Schutter C, Sari O, Mengshetti S, Zhou S, Kasthuri M, Coats SJ, Schinazi RF, Amblard F. Diastereoselective Synthesis of 2'-Dihalopyrimidine Ribonucleoside Inhibitors of Hepatitis C Virus Replication. ACS OMEGA 2022; 7:1452-1461. [PMID: 35036807 PMCID: PMC8756791 DOI: 10.1021/acsomega.1c06174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/03/2021] [Accepted: 12/08/2021] [Indexed: 06/14/2023]
Abstract
We present a newly developed synthetic route to 2-bromo-2-fluoro ribolactone based on our published 2-chloro-2-fluoro ribolactone synthesis. Stereoselective fluorination is key to controlling the 2-diastereoselectivity. We also report a substantially improved glycosylation reaction with both the 2-bromo-2-fluoro and 2-chloro-2-fluoro sugars. These improvements allowed us to prepare 2'-dihalo nucleosides 13 and 14 in an overall 15-20% yield.
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Sadhukhan S, Santhi J, Baire B. The α,α‐Dihalocarbonyl Building Blocks: An Avenue for New Reaction Development in Organic Synthesis. Chemistry 2020; 26:7145-7175. [DOI: 10.1002/chem.201905475] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2019] [Revised: 01/08/2020] [Indexed: 01/04/2023]
Affiliation(s)
- Santu Sadhukhan
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Jampani Santhi
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
| | - Beeraiah Baire
- Department of ChemistryIndian Institute of Technology Madras Chennai 600036 India
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Thakur N, Patil RA, Talebi M, Readel ER, Armstrong DW. Enantiomeric impurities in chiral catalysts, auxiliaries, and synthons used in enantioselective syntheses. Part 5. Chirality 2019; 31:688-699. [PMID: 31318099 DOI: 10.1002/chir.23086] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2019] [Revised: 05/10/2019] [Accepted: 05/13/2019] [Indexed: 01/02/2023]
Abstract
The enantiomeric excess of chiral starting materials is one of the important factors determining the enantiopurity of products in asymmetric synthesis. Fifty-one commercially available chiral reagents used as building blocks, catalysts, and auxiliaries in various enantioselective syntheses were assayed for their enantiomeric purity. The test results were classified within five impurities level (ie, <0.01%, 0.01%-0.1%, 0.1%-1%, 1%-10%, >10%). Previously from 1998 to 2013, several reports have been published on the enantiomeric composition of more than 300 chiral reagents. This series of papers is necessitated by the fact that new reagents are forthcoming and that the enantiomeric purity of the same reagent can vary from batch to batch and/or from supplier to supplier. This report presents chiral liquid chromatography (LC) and gas chromatography (GC) methods to separate enantiomers of chiral compounds and evaluate their enantiomeric purities. The accurate and efficient LC analysis was done using newly introduced superficially porous particle (SPP 2.7 μm) based chiral stationary phases (TeicoShell, VancoShell, LarihcShell-P, and NicoShell).
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Affiliation(s)
- Nimisha Thakur
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Rahul A Patil
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Mohsen Talebi
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Elizabeth R Readel
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
| | - Daniel W Armstrong
- Department of Chemistry and Biochemistry, University of Texas at Arlington, Arlington, Texas
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Kaaniche F, Hamed A, Abdel-Razek AS, Wibberg D, Abdissa N, El Euch IZ, Allouche N, Mellouli L, Shaaban M, Sewald N. Bioactive secondary metabolites from new endophytic fungus Curvularia. sp isolated from Rauwolfia macrophylla. PLoS One 2019; 14:e0217627. [PMID: 31247016 PMCID: PMC6597039 DOI: 10.1371/journal.pone.0217627] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2018] [Accepted: 05/15/2019] [Indexed: 02/06/2023] Open
Abstract
Over the last decades, endophytic fungi represent a new source of pharmacologically active secondary metabolites based on the underlying assumption that they live symbiotically within their plant host. In the present study, a new endophytic fungus was isolated from Rauwolfia macrophylla, a medicinal plant from Cameroon. The fungus showed a highest homology to Curvularia sp. based on complete nucleotide sequence data generated from the internal transcribed spacer (ITS) of ribosomal DNA region. Large scale fermentation, working-up and separation of the strain extract using different chromatographic techniques afforded three bioactive compounds: 2'-deoxyribolactone (1), hexylitaconic acid (2) and ergosterol (3). The chemical structures of compounds 1–3 were confirmed by 1 and 2D NMR spectroscopy and mass spectrometry, and comparison with corresponding literature data. Biologically, the antimicrobial, antioxidant activities and the acetylcholinesterase inhibitory of the isolated compounds were studied.
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Affiliation(s)
- Fatma Kaaniche
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
- Laboratory of Organic Chemistry, Natural Substances Team, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
- Laboratory of Microorganisms and Biomolecules of the Centre of Biotechnology of Sfax-Tunisia, Sfax, Tunisia
| | - Abdelaaty Hamed
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
- Chemistry Department, Faculty of Science, Al-Azhar University, Nasr City-Cairo, Egypt
| | - Ahmed S. Abdel-Razek
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
- Microbial Chemistry Department, Genetic Engineering and Biotechnology Research Division, National Research Centre, Dokki-Giza, Egypt
| | - Daniel Wibberg
- Center of Biotechnology(CeBiTec), Bielefeld University, Bielefeld, Germany
| | - Negera Abdissa
- Department of Chemistry, Jimma University, Jimma, Ethiopia
| | - Imene Zendah El Euch
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
| | - Noureddine Allouche
- Laboratory of Organic Chemistry, Natural Substances Team, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Lotfi Mellouli
- Laboratory of Microorganisms and Biomolecules of the Centre of Biotechnology of Sfax-Tunisia, Sfax, Tunisia
| | - Mohamed Shaaban
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
- Chemistry of Natural Compounds Department, Pharmaceutical and Drug Industries Research Division, National Research Centre, Dokki-Cairo, Egypt
| | - Nobert Sewald
- Department of Chemistry, Organic and Bioorganic Chemistry, Bielefeld University, Bielefeld, Germany
- * E-mail:
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Ponra S, Rabten W, Yang J, Wu H, Kerdphon S, Andersson PG. Diastereo- and Enantioselective Synthesis of Fluorine Motifs with Two Contiguous Stereogenic Centers. J Am Chem Soc 2018; 140:13878-13883. [DOI: 10.1021/jacs.8b08778] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Sudipta Ponra
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
| | - Wangchuk Rabten
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
| | - Jianping Yang
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
| | - Haibo Wu
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
| | - Sutthichat Kerdphon
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
| | - Pher G. Andersson
- Department of Organic Chemistry, Stockholm University, Svante Arrhenius väg 16C, SE-10691 Stockholm, Sweden
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