1
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Jeon H, Kim JH, Kim S. Recent asymmetric synthesis of natural products bearing an α-tertiary amine moiety via temporary chirality induction strategies. Nat Prod Rep 2024; 41:228-250. [PMID: 37846620 DOI: 10.1039/d3np00032j] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2023]
Abstract
Covering: 2013 to 2023The α-tertiary amine moiety is a common structural motif in natural alkaloids and is frequently associated with intriguing biological activities and inherent synthetic challenges. A major hurdle in the total synthesis of these alkaloids is the asymmetric construction of the α-tertiary amine moiety. Temporary chirality inductions have been effective strategies employed to address this issue, particularly in natural product synthesis. The temporary chirality induction strategies in α-tertiary amine synthesis can be broadly classified into three categories based on the types of temporary chirality involved: Seebach's self-regeneration of stereocenters (SRS), C-to-N-to-C chirality transfer, and memory of chirality (MOC). This review highlights the recent advancements in temporary chirality induction strategies for the total synthesis of α-tertiary amine-containing natural products between 2013 and 2023.
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Affiliation(s)
- Hongjun Jeon
- Therapeutics & Biotechnology Division, Korea Research Institute of Chemical Technology (KRICT), Daejeon 34114, Republic of Korea
| | - Jae Hyun Kim
- College of Pharmacy, Chung-Ang University, Seoul 06974, Republic of Korea
| | - Sanghee Kim
- College of Pharmacy, Seoul National University, Seoul 08826, Republic of Korea.
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2
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Saney L, Christensen KE, Li X, Genov M, Pretsch A, Pretsch D, Moloney MG. Tetramate Derivatives by Chemoselective Dieckmann Ring Closure of threo-Phenylserines and Their Antibacterial Activity. J Org Chem 2022; 87:12240-12249. [PMID: 36052923 PMCID: PMC9486951 DOI: 10.1021/acs.joc.2c01382] [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] [Indexed: 11/28/2022]
Abstract
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A general route, which provides direct access to substituted
bicyclic
tetramates, making use of Dieckmann cyclization of oxazolidines derived
from threo-arylserines, is reported; the latter were
found to be available by an efficient aldol-like reaction of glycine
with some substituted benzaldehydes under alkaline conditions. The
tetramates were found to release chelated metal cations acquired during
chromatographic purification by mild acid wash. Some compounds in
the library showed good antibacterial activity against Gram-positive
bacteria. Cheminformatic analysis demonstrates that the most active
compounds were Ro5-compliant and occupy a narrow region of chemical
space, distinct from that occupied by other known antibiotics, with
the most potent compounds having 399 < Mw < 530 Da;
3.5 < cLogP < 6.6; 594 < MSA <818 Å2; 9.6 < rel. PSA <13.3%. MIC values were shifted to
higher concentrations when tested in the presence of HSA or blood,
but was not completely abolished, consistent with a plasma protein
binding (PPB) effect.
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Affiliation(s)
- Liban Saney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Kirsten E Christensen
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Xiang Li
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Department of Pharmaceutical Engineering, China Pharmaceutical University, Nanjing 211198, P. R. China
| | - Miroslav Genov
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre, Oxford OX4 4GA, U.K
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K.,Oxford Suzhou Centre for Advanced Research, Suzhou Industrial Park, Building A, 388 Ruo Shui Road, Jiangsu 215123, P.R. China
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3
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Nelli MR, Heitmeier KN, Looper RE. Dissecting the Nucleoside Antibiotics as Universal Translation Inhibitors. Acc Chem Res 2021; 54:2798-2811. [PMID: 34152729 DOI: 10.1021/acs.accounts.1c00221] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Without question, natural products have provided the lion share of leads, if not drugs themselves, for the treatment of bacterial infections. The bacterial arms race, fueled by selection and survival pressures has delivered a natural arsenal of small molecules targeting the most essential of life processes. Antibiotics that target these critical intracellular processes face the formidable defense of both penetrating a bacterial cell membrane and avoiding efflux to exert their effect. These challenges are especially effective in Gram-negative (Gram-(-)) bacteria, which have a double membrane structure and efficient efflux systems from the combination of outer-membrane porins and inner membrane proton pumps. In this landscape of offense and defense, our clinically used antibiotics have only successfully targeted three intracellular processes for therapeutic intervention in Gram-(-) bacteria: dihydrofolate biosynthesis, transcription, and translation. Not surprisingly, such critical survival machinery is a popular target for bacterial warfare, and eight of our 14 classes of commonly used antibiotics target translation with the bacterial ribosome remaining one the most vetted targets for antimicrobial therapy. On the plus side, its anionic character attracts cationic inhibitors, which are generally more capable of penetrating the bacterial cell wall, and clinical resistance rates are usually manageable as mutation of such a highly evolved machine is difficult. On the down side, this highly evolved machine renders it difficult to inhibit selectively, and the inhibition of prokaryotic translation versus both eukaryotic cellular and mitochondrial translation is critical for clinical development and minimization of undesired toxicities.A class of natural products known as the "nucleoside antibiotics" have historically been recognized as universal inhibitors of the ribosome and can inhibit translation in prokaryotes, eukaryotes, and archaea. While they have served an essential role in dissecting the biochemical underpinnings of the enzymatic functions of the ribosome, they have not proven therapeutically useful as they target the highly conserved rRNA in the P-site and are toxic to mammalian cells. In this Account, we describe our studies on the natural product amicetin, a nucleoside antibiotic that we have demonstrated to break the rule of being a universal translation inhibitor. While the cytosine of amicetin mimics C75 of the 3'-CCA tail of the P-site tRNA akin to other nucleoside antibiotics, we advance a hypothesis that amicetin's unique interaction with the ribosomal protein uL16 exploits an untapped mechanism for selectively targeting the bacterial ribosome. A complex molecule comprised of a nucleoside, carbohydrates and amino acids, amicetin is also chemically unstable. Our initial attempts to stabilize and simplify this scaffold are presented with the ultimate goal of rebuilding the compound with improved penetrance to bacterial cells. If successful, this scaffold would demonstrate a path forward for a new class of antibiotics capable of selectively targeting the ribosomal P-site.
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Affiliation(s)
- Matthew R. Nelli
- Department of Chemistry, University of Utah, Salt Lake City Utah 84103, United States
| | - Kendall N. Heitmeier
- Department of Chemistry, University of Utah, Salt Lake City Utah 84103, United States
| | - Ryan E. Looper
- Department of Chemistry, University of Utah, Salt Lake City Utah 84103, United States
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4
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Inuki S, Ohno H. Total Syntheses of Myriocin, Mycestericins and Sphingofungin E: Sphingosine Analogues Containing a β, β′-Dihydroxy α-Amino Acid Framework. CHEM LETT 2021. [DOI: 10.1246/cl.210133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Shinsuke Inuki
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Hiroaki Ohno
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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5
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Takeuchi H, Inuki S, Nakagawa K, Kawabe T, Ichimura A, Oishi S, Ohno H. Total Synthesis of Zephycarinatines via Photocatalytic Reductive Radical ipso-Cyclization. Angew Chem Int Ed Engl 2020; 59:21210-21215. [PMID: 32770565 DOI: 10.1002/anie.202009399] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Indexed: 12/13/2022]
Abstract
We report herein a nonbiomimetic strategy for the total synthesis of the plicamine-type alkaloids zephycarinatines C and D. The key feature of the synthesis is a stereoselective reductive radical ipso-cyclization using visible-light-mediated photoredox catalysis. This cyclization enabled the construction of a 6,6-spirocyclic core structure through the addition of a carbon-centered radical onto the aromatic ring. Biological evaluation of zephycarinatines and their derivatives revealed that the synthetic derivative with a keto group displays moderate inhibitory activity against LPS-induced NO production. This approach could offer future opportunities to expand the chemical diversity of plicamine-type alkaloids as well as providing useful intermediates for their syntheses.
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Affiliation(s)
- Haruka Takeuchi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Shinsuke Inuki
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Kohei Nakagawa
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Takaaki Kawabe
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Atsuhiko Ichimura
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Shinya Oishi
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Hiroaki Ohno
- Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
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6
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Takeuchi H, Inuki S, Nakagawa K, Kawabe T, Ichimura A, Oishi S, Ohno H. Total Synthesis of Zephycarinatines via Photocatalytic Reductive Radical
ipso
‐Cyclization. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009399] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Haruka Takeuchi
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Shinsuke Inuki
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Kohei Nakagawa
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Takaaki Kawabe
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Atsuhiko Ichimura
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Shinya Oishi
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
| | - Hiroaki Ohno
- Graduate School of Pharmaceutical Sciences Kyoto University Sakyo-ku Kyoto 606-8501 Japan
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7
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Moloney MG, Bagum H, Shire BR, Christensen KE, Genov M, Pretsch A, Pretsch D. Bicyclic Lactams Derived from Serine or Cysteine and 2-Methylpropanal. Synlett 2020. [DOI: 10.1055/s-0039-1691569] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
Bicyclic lactams may be prepared from serine or cysteine and 2-methylpropanal; the resulting S,N-heterocycles are more stable than the corresponding O,N-heterocycles but both are synthetic intermediates capable of further elaboration.
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Affiliation(s)
- Mark G. Moloney
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford
- Oxford Suzhou Centre for Advanced Research
| | - Halima Bagum
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford
| | - Bethany R. Shire
- The Department of Chemistry, Chemistry Research Laboratory, University of Oxford
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8
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Narczyk A, Stecko S. The synthesis of unnatural α-alkyl- and α-aryl-substituted serine derivatives. Org Biomol Chem 2020; 18:1204-1213. [PMID: 31995087 DOI: 10.1039/c9ob02472g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of α-aryl- and α-alkyl-substituted serine derivatives via [3,3]-sigmatropic rearrangement of allyl carbamates as a key step is reported. Allyl carbamates were obtained from the corresponding allyl alcohols. The former were prepared through three approaches. Aryl-substituted ones were synthesized via the Stille coupling reaction of aryl iodides with enantiomerically enriched vinyl stannanes. Conversely, alkyl-substituted allyl alcohols were prepared by an analogous strategy involving the Negishi coupling reaction of enantiomerically enriched vinyl iodides or by enzymatic kineric resolution of the corresponding racemic alcohols.
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Affiliation(s)
- Aleksandra Narczyk
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
| | - Sebastian Stecko
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland.
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9
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Bagum H, Christensen KE, Genov M, Pretsch A, Pretsch D, Moloney MG. Synthetic access to 3,4-disubstituted pyroglutamates from tetramate derivatives from serine, allo-threonine and cysteine. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130561] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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10
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Bagum H, Christensen KE, Genov M, Pretsch A, Pretsch D, Moloney MG. Synthetic Access to 3-Substituted Pyroglutamic Acids from Tetramate Derivatives of Serine, Threonine, allo-Threonine, and Cysteine. J Org Chem 2019; 84:10257-10279. [PMID: 31287955 DOI: 10.1021/acs.joc.9b01432] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general route which provides direct access to pyroglutamates from tetramates, making use of Suzuki coupling on an enol mesylate, followed by reduction, is reported. This work permits direct scaffold hopping from tetramate to substituted pyroglutamates. Some compounds in the library showed modest antibacterial activity against Gram-positive bacteria.
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Affiliation(s)
- Halima Bagum
- The Department of Chemistry, Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , U.K
| | - Kirsten E Christensen
- The Department of Chemistry, Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , U.K
| | - Miroslav Genov
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre , Oxford OX4 4GA , U.K
| | - Alexander Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre , Oxford OX4 4GA , U.K
| | - Dagmar Pretsch
- Oxford Antibiotic Group, The Oxford Science Park, Magdalen Centre , Oxford OX4 4GA , U.K
| | - Mark G Moloney
- The Department of Chemistry, Chemistry Research Laboratory , University of Oxford , 12 Mansfield Road , Oxford OX1 3TA , U.K.,Oxford Suzhou Centre for Advanced Research , Building A, 388 Ruo Shui Road, Suzhou Industrial Park , Suzhou , Jiangsu 215123 , P. R. China
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11
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Seebach D. Preparation of Enantiomerically Pure Compounds Employing Anodic Oxidations of Carboxylic Acids – A Late Review of Research Done in the 1980ies. Helv Chim Acta 2019. [DOI: 10.1002/hlca.201900072] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Dieter Seebach
- Laboratorium für Organische Chemie, Department Chemie und Angewandte BiowissenschaftenETH-Zürich, Hönggerberg HCI Vladimir-Prelog-Weg 3 CH-8093 Zürich Switzerland
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12
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Yamamoto K, Ishimaru S, Oyama T, Tanigawa S, Kuriyama M, Onomura O. Enantioselective Synthesis of α-Substituted Serine Derivatives via Cu-Catalyzed Oxidative Desymmetrization of 2-Amino-1,3-diols. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.8b00407] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kosuke Yamamoto
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Shota Ishimaru
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Tatsuya Oyama
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Satoko Tanigawa
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Masami Kuriyama
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Osamu Onomura
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
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13
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Ruysbergh E, Van Hecke K, Stevens CV, De Kimpe N, Mangelinckx S. Synthesis of 1,4-Oxazepane-2,5-diones via Cyclization of Rotationally Restricted Amino Acid Precursors and Structural Reassignment of Serratin. J Org Chem 2017; 82:6210-6222. [DOI: 10.1021/acs.joc.7b00790] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ewout Ruysbergh
- Department
of Sustainable Organic Chemistry and Technology, Faculty of Bioscience
Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Kristof Van Hecke
- XStruct,
Department of Inorganic and Physical Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, S3, B-9000 Ghent, Belgium
| | - Christian V. Stevens
- Department
of Sustainable Organic Chemistry and Technology, Faculty of Bioscience
Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Norbert De Kimpe
- Department
of Sustainable Organic Chemistry and Technology, Faculty of Bioscience
Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Sven Mangelinckx
- Department
of Sustainable Organic Chemistry and Technology, Faculty of Bioscience
Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
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14
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James E, Pertusati F, Brancale A, McGuigan C. Kinase-independent phosphoramidate S1P 1 receptor agonist benzyl ether derivatives. Bioorg Med Chem Lett 2017; 27:1371-1378. [PMID: 28236593 DOI: 10.1016/j.bmcl.2017.02.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Revised: 02/03/2017] [Accepted: 02/05/2017] [Indexed: 02/01/2023]
Abstract
Previously published S1P receptor modulator benzyl ether derivatives have shown potential as being viable therapeutics for the treatment of neurodegenerative diseases, however, two of the most S1P1-selective compounds are reported as being poorly phosphorylated by kinases in vivo. Phosphoramidates of BED compounds (2a, 2b) were synthesised with the aim of producing kinase-independent S1P receptor modulators. Carboxypeptidase, human serum and cell lysate processing experiments were conducted. ProTide BED analogues were found to have an acceptable level of stability in acidic and basic conditions and in vitro metabolic processing experiments showed that they are processed to the desired pharmacologically active monophosphate. The research describes the development of an entirely novel family of therapeutic agents.
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Affiliation(s)
- Edward James
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK.
| | - Fabrizio Pertusati
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Andrea Brancale
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
| | - Chris McGuigan
- School of Pharmacy and Pharmaceutical Sciences, Cardiff University, King Edward VII Avenue, Cardiff CF10 3NB, UK
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15
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Inuki S, Sato K, Fukuyama T, Ryu I, Fujimoto Y. Formal Total Synthesis of l-Ossamine via Decarboxylative Functionalization Using Visible-Light-Mediated Photoredox Catalysis in a Flow System. J Org Chem 2017; 82:1248-1253. [DOI: 10.1021/acs.joc.6b02531] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Shinsuke Inuki
- Graduate
School of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan
| | - Keisuke Sato
- Graduate
School of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan
| | - Takahide Fukuyama
- Graduate
School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Ilhyong Ryu
- Graduate
School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan
| | - Yukari Fujimoto
- Graduate
School of Science and Technology, Keio University, Yokohama, Kanagawa 223-8522, Japan
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16
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Patre RE, Mal S, Nilkanth PR, Ghorai SK, Deshpande SH, El Qacemi M, Smejkal T, Pal S, Manjunath BN. First report on bio-catalytic N-formylation of amines using ethyl formate. Chem Commun (Camb) 2017; 53:2382-2385. [DOI: 10.1039/c6cc07679c] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A bio-catalyzed N-formylation reaction of different amines has been developed using ethyl formate as a formylating agent.
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Affiliation(s)
| | - Sanjib Mal
- Syngenta Biosciences Pvt. Ltd
- Santa Monica Works
- India
| | | | | | | | | | - Tomas Smejkal
- Syngenta Crop Protection Muenchwilen AG
- CH-4332 Stein
- Switzerland
| | - Sitaram Pal
- Syngenta Biosciences Pvt. Ltd
- Santa Monica Works
- India
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17
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18
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Panduwawala TD, Josa-Culleré L, Kuprov I, Odell B, Moloney MG, Claridge TDW. Scalar Cross-Relaxation Detected in the NOESY Spectra of Oxazolidines and Thiazolidines. J Org Chem 2016; 81:4142-8. [DOI: 10.1021/acs.joc.6b00458] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tharindi D. Panduwawala
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Laia Josa-Culleré
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Ilya Kuprov
- School
of Chemistry, University of Southampton, Highfield Campus, Southampton SO17 1BJ, U.K
| | - Barbara Odell
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Mark G. Moloney
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
| | - Timothy D. W. Claridge
- Department
of Chemistry, Chemistry Research Laboratory, University of Oxford, Mansfield Road, Oxford OX1 3TA, U.K
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19
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Wang T, Yu Z, Hoon DL, Phee CY, Lan Y, Lu Y. Regiodivergent Enantioselective γ-Additions of Oxazolones to 2,3-Butadienoates Catalyzed by Phosphines: Synthesis of α,α-Disubstituted α-Amino Acids and N,O-Acetal Derivatives. J Am Chem Soc 2015; 138:265-71. [DOI: 10.1021/jacs.5b10524] [Citation(s) in RCA: 135] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Tianli Wang
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Zhaoyuan Yu
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P. R. China
| | - Ding Long Hoon
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Claire Yan Phee
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Yu Lan
- School
of Chemistry and Chemical Engineering, Chongqing University, Chongqing 400030, P. R. China
| | - Yixin Lu
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
- National University of Singapore (Suzhou) Research Institute, 377 Lin Quan Street, Suzhou Industrial Park, Suzhou, Jiangsu P. R. China, 215123
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20
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Inuki S, Sato K, Fujimoto Y. Visible-light-mediated decarboxylative benzoyloxylation of β-hydroxy amino acids and its application to synthesis of functional 1,2-amino alcohol derivatives. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.09.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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21
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Nagatomo M, Nishiyama H, Fujino H, Inoue M. Decarbonylative Radical Coupling of α-Aminoacyl Tellurides: Single-Step Preparation of γ-Amino and α,β-Diamino Acids and Rapid Synthesis of Gabapentin and Manzacidin A. Angew Chem Int Ed Engl 2014; 54:1537-41. [DOI: 10.1002/anie.201410186] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Indexed: 11/09/2022]
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22
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Nagatomo M, Nishiyama H, Fujino H, Inoue M. Decarbonylative Radical Coupling of α-Aminoacyl Tellurides: Single-Step Preparation of γ-Amino and α,β-Diamino Acids and Rapid Synthesis of Gabapentin and Manzacidin A. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201410186] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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23
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Nishi T, Nakamura T, Nakamura Y. Exploratory and Process Research on S1P1 Receptor Agonist CS-0777. J SYN ORG CHEM JPN 2014. [DOI: 10.5059/yukigoseikyokaishi.72.808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Anwar M, Moloney MG. Chiral Bicyclic Tetramates as Non-Planar Templates for Chemical Library Synthesis. Chem Biol Drug Des 2013; 81:645-9. [DOI: 10.1111/cbdd.12110] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2012] [Accepted: 01/15/2013] [Indexed: 11/26/2022]
Affiliation(s)
- Muhammad Anwar
- Department of Chemistry; Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road; Oxford; OX1 3TA; UK
| | - Mark G. Moloney
- Department of Chemistry; Chemistry Research Laboratory; The University of Oxford; 12 Mansfield Road; Oxford; OX1 3TA; UK
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25
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Angelov P, Chau YKS, Fryer PJ, Moloney MG, Thompson AL, Trippier PC. Biomimetic synthesis, antibacterial activity and structure-activity properties of the pyroglutamate core of oxazolomycin. Org Biomol Chem 2012; 10:3472-85. [PMID: 22437843 DOI: 10.1039/c2ob00042c] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Biomimetic intramolecular aldol reactions on oxazolidine templates derived from serine may be used to generate densely functionalised pyroglutamates, which are simpler mimics of the right hand side of oxazolomycin. Some of the compounds from this sequence exhibit in vivo activity against S. aureus and E. coli, suggesting that pyroglutamate scaffolds may be useful templates for the development of novel antibacterials, and cheminformatic analysis has been used to provide some structure-activity data.
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Affiliation(s)
- Plamen Angelov
- Department of Chemistry, Chemistry Research Laboratory, The University of Oxford, 12 Mansfield Road, Oxford, OX1 3TA, UK
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26
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Remote Stereocontrol in [3,3]-Sigmatropic Rearrangements: Application to the Total Synthesis of the Immunosuppressant Mycestericin G. Org Lett 2012; 14:756-9. [DOI: 10.1021/ol203300k] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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27
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Serrano CM, Looper RE. Synthesis of Cytimidine through a One-Pot Copper-Mediated Amidation Cascade. Org Lett 2011; 13:5000-3. [DOI: 10.1021/ol2018196] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Catherine M. Serrano
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
| | - Ryan E. Looper
- Department of Chemistry, University of Utah, 315 South 1400 East, Salt Lake City, Utah 84112, United States
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28
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Anson MS, Graham JP, Roberts AJ. Development of a Fully Telescoped Synthesis of the S1P1 Agonist GSK1842799. Org Process Res Dev 2011. [DOI: 10.1021/op2000095] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael S. Anson
- Chemical Development, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Jonathan P. Graham
- Chemical Development, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Alastair J. Roberts
- Chemical Development, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
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29
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Iio Y, Yamaoka M, Jin M, Nakamura Y, Nishi T. Asymmetric synthesis of α,α-disubstituted α-amino alcohol derivatives. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.tetasy.2011.02.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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30
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Anson MS, Clark HF, Evans P, Fox ME, Graham JP, Griffiths NN, Meek G, Ramsden JA, Roberts AJ, Simmonds S, Walker MD, Willets M. Complementary Syntheses of N,O-Protected-(S)-2-methylserine on a Multikilogram Scale. Org Process Res Dev 2011. [DOI: 10.1021/op100299d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael S. Anson
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Hugh F. Clark
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Paul Evans
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Martin E. Fox
- Chirotech Technology Ltd., A subsidiary of Dr. Reddy’s Laboratories (EU) Ltd., Unit 162 Cambridge Science Park, Milton Road, Cambridge CB4 0GH, U.K
| | - Jonathan P. Graham
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Natalie N. Griffiths
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Graham Meek
- Chirotech Technology Ltd., A subsidiary of Dr. Reddy’s Laboratories (EU) Ltd., Unit 162 Cambridge Science Park, Milton Road, Cambridge CB4 0GH, U.K
| | - James A. Ramsden
- Chirotech Technology Ltd., A subsidiary of Dr. Reddy’s Laboratories (EU) Ltd., Unit 162 Cambridge Science Park, Milton Road, Cambridge CB4 0GH, U.K
| | - Alastair J. Roberts
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Shaun Simmonds
- Chirotech Technology Ltd., A subsidiary of Dr. Reddy’s Laboratories (EU) Ltd., Unit 162 Cambridge Science Park, Milton Road, Cambridge CB4 0GH, U.K
| | - Matthew D. Walker
- Chemical Development Division, GlaxoSmithKline Research and Development Ltd., Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Matthew Willets
- Chirotech Technology Ltd., A subsidiary of Dr. Reddy’s Laboratories (EU) Ltd., PO Box 6 Steanard Lane, Mirfield, West Yorkshire WF14 8QB, U.K
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31
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Jeong YC, Anwar M, Nguyen TM, Tan BSW, Chai CLL, Moloney MG. Control of chemoselectivity in Dieckmann ring closures leading to tetramic acids. Org Biomol Chem 2011; 9:6663-9. [DOI: 10.1039/c1ob05816a] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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32
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Anwar M, Cowley AR, Moloney MG. Novel chiral pyrrolidinone scaffolds derived from threonine with antibacterial activity. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2010.04.064] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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33
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Aizpurua JM, Palomo C, Fratila RM, Ferrón P, Miranda JI. Stereomodulating effect of remote groups on the NADH-mimetic reduction of alkyl aroylformates with 1,4-dihydronicotinamide-β-lactam amides. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.02.085] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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34
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Jiang H, Paixão MW, Monge D, Jørgensen KA. Acyl Phosphonates: Good Hydrogen Bond Acceptors and Ester/Amide Equivalents in Asymmetric Organocatalysis. J Am Chem Soc 2010; 132:2775-83. [DOI: 10.1021/ja9097803] [Citation(s) in RCA: 197] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hao Jiang
- Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Márcio W. Paixão
- Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - David Monge
- Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
| | - Karl Anker Jørgensen
- Center for Catalysis, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark
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35
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36
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Wang B, Lin GQ. A Flexible Common Approach to α-Substituted Serines and Alanines: Diastereoconvergent Syntheses of Sphingofungins E and F. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900772] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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37
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PAVONE V, BLASIO B, LOMBARDI A, MAGLIO O, ISERNIAI C, PEDONE C, BENEDETTI E, ALTMANN E, MUTTER M. Non coded Cα,α-disubstituted amino acids. ACTA ACUST UNITED AC 2009. [DOI: 10.1111/j.1399-3011.1993.tb00110.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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38
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Seebach D, Grošelj U, Badine D, Schweizer W, Beck A. Isolation and X-Ray Structures of Reactive Intermediates of Organocatalysis with Diphenylprolinol Ethers and with Imidazolidinones. Helv Chim Acta 2008. [DOI: 10.1002/hlca.200890216] [Citation(s) in RCA: 155] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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39
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Nakayama K, Maruoka K. Practical asymmetric synthesis of α-methylserine derivatives under mild phase-transfer conditions. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.07.013] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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40
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Moriyama K, Sakai H, Kawabata T. Direct Asymmetric Intramolecular Alkylation of β-Alkoxy-α-amino Esters via Memory of Chirality. Org Lett 2008; 10:3883-6. [DOI: 10.1021/ol801213c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Katsuhiko Moriyama
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Hiroki Sakai
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
| | - Takeo Kawabata
- Institute for Chemical Research, Kyoto University, Uji, Kyoto 611-0011, Japan
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41
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Nakano K, Kotsuki H, Ichikawa Y. SYNTHESIS OF CONAGENIN AND α-METHYLSERINE. A REVIEW. ORG PREP PROCED INT 2008. [DOI: 10.1080/00304940809356641] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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42
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Crich D, Banerjee A. Expedient synthesis of threo-beta-hydroxy-alpha-amino acid derivatives: phenylalanine, tyrosine, histidine, and tryptophan. J Org Chem 2007; 71:7106-9. [PMID: 16930077 PMCID: PMC2621330 DOI: 10.1021/jo061159i] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An expedient synthesis of enantiomerically pure threo-beta-hydroxy-alpha-amino acid derivatives of phenylalanine, tyrosine, histidine, and tryptophan is described. The NBS-mediated radical bromination of the N,N-di-tert-butoxycarbonyl protected alpha-amino acids and subsequent treatment with silver nitrate in acetone provided the trans-oxazolidinones predominantly. Cesium carbonate catalyzed hydrolysis then generated the beta-hydroxy amino acid derivatives in excellent overall yield.
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Affiliation(s)
- David Crich
- Department of Chemistry, University of Illinois at Chicago, 845 West Taylor Street, Chicago, IL 60607-7061, USA.
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43
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Edwards DJ, House D, Sheldrake HM, Stone SJ, Wallace TW. Kinetic and thermodynamic control of axial chirality in biaryl-derived fused oxazolidine lactams exploiting a centre-axis relay of unit efficiency. Org Biomol Chem 2007; 5:2658-69. [DOI: 10.1039/b706336a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Efficient enantioselective synthesis of orthogonally protected (R)-α-alkylserines compatible with the solid phase peptide synthesis. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.08.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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45
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Fielder S, Rowan DD, Reay PF. The synthesis of 4-2H-α-farnesene and 1-2H-α-farnesene. J Labelled Comp Radiopharm 2006. [DOI: 10.1002/jlcr.2580331011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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46
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Hussaini SR, Moloney MG. 2,5-Disubstituted pyrrolidines: synthesis by enamine reduction and subsequent regioselective and diastereoselective alkylations. Org Biomol Chem 2006; 4:2600-15. [PMID: 16791325 DOI: 10.1039/b604183c] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Methodology for the diastereoselective synthesis of 2,5-disubstituted pyrrolidines by reduction of enamines derived from pyroglutamic acid is reported; the nature of nitrogen protection was found to be critical for the stereochemical control of the reaction outcome. Regioselective manipulation of the C-2 and C-5 substituents is possible, providing access to differently substituted pyrrolidines for a limited number of cases.
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47
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Wood ME, Penny MJ, Steere JS, Horton PN, Light ME, Hursthouse MB. A general route to protected quaternary α-amino acids from β-amino alcohols via a stereocontrolled radical approach. Chem Commun (Camb) 2006:2983-5. [PMID: 16832511 DOI: 10.1039/b604123j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A radical-based approach facilitates the highly stereocontrolled functionalisation of beta-amino alcohols, opening up a new, generally applicable methodology for the preparation of quaternary alpha-amino acids.
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Affiliation(s)
- Mark E Wood
- School of Biosciences (originally Department of Chemistry), University of Exeter, Geoffrey Pope Building, Stocker Road, Exeter, UKEX4 4QD.
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48
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Brunner M, Nissinen M, Rissanen K, Straub T, Koskinen AM. Diastereoselective formation of highly functionalised α-substituted amino acid derivatives via aldol addition. J Mol Struct 2005. [DOI: 10.1016/j.molstruc.2004.09.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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49
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Kündig EP, Cunningham AF, Paglia P, Simmons DP, Bernardinelli G. trans-Disubstituted CyclohexadienesviaSequential Addition of a Carbon Nucleophile and an Electrophile to (η6-Benzene)tricarbonylchromium: Scope of Carbon Electrophiles. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19900730218] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Obrecht D, Spiegler C, Schönholzer P, Müller K, Heimgartner H, Stierli F. A New General Approach to Enantiomerically Pure Cyclic and Open-Chain (R)- and (S)-α,α-Disubstituted α-Amino Acids. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19920750522] [Citation(s) in RCA: 80] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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