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Yi X, Long X, Chen Y, Cen X, Tang P, Chen F. Asymmetric total synthesis of prostaglandin C 2 TBS ether. Chem Commun (Camb) 2022; 58:6000-6003. [PMID: 35485419 DOI: 10.1039/d2cc01737g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We disclose an asymmetric total synthesis of prostaglandin C2 TBS ether, a derivative of an extremely sensitive natural prostaglandin C2. The key to the synthesis is a SmI2-mediated ketyl-enoate reaction that leads to the formation of the functionalized cyclopentane ring with high-level stereochemical control. Access to the crucial alkene system is realized late in the synthesis by the implementation of a Grignard addition/dehydration/metathesis sequence.
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Affiliation(s)
- Xiaofen Yi
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China.
| | - Xueyu Long
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China.
| | - Yu Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China.
| | - Xiangling Cen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China.
| | - Pei Tang
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China.
| | - Fener Chen
- Sichuan Research Center for Drug Precision Industrial Technology, West China School of Pharmacy, Sichuan University, Chengdu 610041, China. .,Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University, Shanghai 200433, China.,Shanghai Engineering Center of Industrial Asymmetric Catalysis for Chiral Drugs, Shanghai 200433, China
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2
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Budakoti A, Mondal PK, Verma P, Khamrai J. Prins cyclization-mediated stereoselective synthesis of tetrahydropyrans and dihydropyrans: an inspection of twenty years. Beilstein J Org Chem 2021; 17:932-963. [PMID: 33981366 PMCID: PMC8093554 DOI: 10.3762/bjoc.17.77] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2021] [Accepted: 04/14/2021] [Indexed: 11/25/2022] Open
Abstract
Functionalized tetrahydropyran (THP) rings are important building blocks and ubiquitous scaffolds in many natural products and active pharmaceutical ingredients (API). Among various established methods, the Prins reaction has emerged as a powerful technique in the stereoselective synthesis of the tetrahydropyran skeleton with various substituents, and the strategy has further been successfully applied in the total synthesis of bioactive macrocycles and related natural products. In this context, hundreds of valuable contributions have already been made in this area, and the present review is intended to provide the systematic assortment of diverse Prins cyclization strategies, covering the literature reports of the last twenty years (from 2000 to 2019), with an aim to give an overview on exciting advancements in this area and designing new strategies for the total synthesis of related natural products.
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Affiliation(s)
- Asha Budakoti
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Pradip Kumar Mondal
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Prachi Verma
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
| | - Jagadish Khamrai
- Division of Molecular Synthesis & Drug Discovery, Centre of Biomedical Research (CBMR), SGPGIMS Campus Raebareli Road, Lucknow, 226014 Uttar Pradesh, India
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3
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Highly Diastereoselective Chelation-Controlled 1,3-anti-Allylation of (S)-3-(Methoxymethyl)hexanal Enabled by Hydrate of Scandium Triflate. Symmetry (Basel) 2021. [DOI: 10.3390/sym13030470] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
En route to the total synthesis of (+)-Neopeltolide, we explored Lewis acid-assisted diastereoselective allylation of MOM-protected 3-hydroxylhexanal with β-(2,2-diethoxyethyl)-substituted (allyl)tributylstannane. The hydrated form of scandium triflate was found to be essential for attaining high 1,3-anti-diastereoselectivity (d.r. 94:6), while the use of anhydrous catalyst resulted in a modest diastereocontrol (d.r. 76:24). The preferred 1,3-anti-selectivity in this transformation can be rationalized in the framework of the Reetz chelate model of asymmetric induction. The 1,3-anti-configuration of the product was confirmed by its conversion into the known C7-C16 building block of (+)-Neopeltolide. We also report an improved protocol for the synthesis of β-(2,2-diethoxyethyl)-substituted (allyl)tributylstannane, which can be utilized as a cost-efficient bipolar isoprenoid-type C5-building block in the synthesis of natural compounds.
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Cummins TJ, Kedei N, Czikora A, Lewin NE, Kirk S, Petersen ME, McGowan KM, Chen JQ, Luo X, Johnson RC, Ravichandran S, Blumberg PM, Keck GE. Synthesis and Biological Evaluation of Fluorescent Bryostatin Analogues. Chembiochem 2018; 19:877-889. [PMID: 29424951 DOI: 10.1002/cbic.201700655] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Indexed: 11/10/2022]
Abstract
To investigate the cellular distribution of tumor-promoting vs. non-tumor-promoting bryostatin analogues, we synthesized fluorescently labeled variants of two bryostatin derivatives that have previously shown either phorbol ester-like or bryostatin-like biological activity in U937 leukemia cells. These new fluorescent analogues both displayed high affinity for protein kinase C (PKC) binding and retained the basic properties of the parent unlabeled compounds in U937 assays. The fluorescent compounds showed similar patterns of intracellular distribution in cells, however; this argues against an existing hypothesis that various patterns of intracellular distribution are responsible for differences in biological activity. Upon further characterization, the fluorescent compounds revealed a slow rate of cellular uptake; correspondingly, they showed reduced activity for cellular responses that were only transient upon treatment with phorbol ester or bryostatin 1.
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Affiliation(s)
- Thomas J Cummins
- University of Utah, Department of Chemistry, 315 South 1400 East, Room 2020, Salt Lake City, UT, 84112, USA
| | - Noemi Kedei
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, 37 Convent Drive, Room 4048, Bethesda, MD, 20892, USA
| | - Agnes Czikora
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, 37 Convent Drive, Room 4048, Bethesda, MD, 20892, USA
| | - Nancy E Lewin
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, 37 Convent Drive, Room 4048, Bethesda, MD, 20892, USA
| | - Sharon Kirk
- University of Utah, Department of Chemistry, 315 South 1400 East, Room 2020, Salt Lake City, UT, 84112, USA
| | - Mark E Petersen
- University of Utah, Department of Chemistry, 315 South 1400 East, Room 2020, Salt Lake City, UT, 84112, USA
| | - Kevin M McGowan
- University of Utah, Department of Chemistry, 315 South 1400 East, Room 2020, Salt Lake City, UT, 84112, USA
| | - Jin-Qiu Chen
- Collaborative Protein Technology Resource, Center for Cancer Research, National Cancer Institute, 37 Convent Drive, Room 1044, Bethesda, MD, 20892, USA
| | - Xiaoling Luo
- Collaborative Protein Technology Resource, Center for Cancer Research, National Cancer Institute, 37 Convent Drive, Room 1044, Bethesda, MD, 20892, USA
| | - Randall C Johnson
- Advanced Biomedical and Computational Sciences Biomedical Informatics, and Data Science (BIDS), Directorate Frederick National Laboratory for Cancer Research (FNLCR), Leidos Biomedical Research, Inc., Building 430, Miller Drive, Fort Detrick, Frederick, MD, 21702, USA
| | - Sarangan Ravichandran
- Advanced Biomedical and Computational Sciences Biomedical Informatics, and Data Science (BIDS), Directorate Frederick National Laboratory for Cancer Research (FNLCR), Leidos Biomedical Research, Inc., Building 430, Miller Drive, Fort Detrick, Frederick, MD, 21702, USA
| | - Peter M Blumberg
- Laboratory of Cancer Biology and Genetics, Center for Cancer Research, National Cancer Institute, 37 Convent Drive, Room 4048, Bethesda, MD, 20892, USA
| | - Gary E Keck
- University of Utah, Department of Chemistry, 315 South 1400 East, Room 2020, Salt Lake City, UT, 84112, USA
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6
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Nicolaou KC, Pulukuri KK, Yu R, Rigol S, Heretsch P, Grove CI, Hale CRH, ElMarrouni A. Total Synthesis of Δ12-Prostaglandin J3: Evolution of Synthetic Strategies to a Streamlined Process. Chemistry 2016; 22:8559-70. [DOI: 10.1002/chem.201601449] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2016] [Indexed: 01/12/2023]
Affiliation(s)
- K. C. Nicolaou
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
| | - Kiran Kumar Pulukuri
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
| | - Ruocheng Yu
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
| | - Stephan Rigol
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
| | - Philipp Heretsch
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
| | - Charles I. Grove
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
| | - Christopher R. H. Hale
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
- Department of Chemistry; The Scripps Research Institute; 10550 North Torrey Pines Road La Jolla CA 92037 USA
| | - Abdelatif ElMarrouni
- Department of Chemistry; BioScience Research Collaborative; Rice University; 6100 Main Street Houston TX 77005 USA
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7
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Das S, Kuilya TK, Goswami RK. Asymmetric Total Synthesis of Bioactive Natural Lipid Mycalol. J Org Chem 2015; 80:6467-89. [DOI: 10.1021/acs.joc.5b00972] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Subhendu Das
- Department of Organic Chemistry, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
| | - 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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8
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Shiina I. An Adventurous Synthetic Journey with MNBA from Its Reaction Chemistry to the Total Synthesis of Natural Products. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2014. [DOI: 10.1246/bcsj.20130216] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Isamu Shiina
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science
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9
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Studies in the Synthesis of Biaryl Natural Products. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/b978-0-12-417185-5.00010-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
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11
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Zurwerra D, Glaus F, Betschart L, Schuster J, Gertsch J, Ganci W, Altmann KH. Total Synthesis of (−)-Zampanolide and Structure-Activity Relationship Studies on (−)-Dactylolide Derivatives. Chemistry 2012; 18:16868-83. [DOI: 10.1002/chem.201202553] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2012] [Indexed: 11/07/2022]
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12
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Shiina I, Umezaki Y, Kuroda N, Iizumi T, Nagai S, Katoh T. MNBA-Mediated β-Lactone Formation: Mechanistic Studies and Application for the Asymmetric Total Synthesis of Tetrahydrolipstatin. J Org Chem 2012; 77:4885-901. [DOI: 10.1021/jo300139r] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Isamu Shiina
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku,
Tokyo 162-8601, Japan
| | - Yuma Umezaki
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku,
Tokyo 162-8601, Japan
| | - Nobutaka Kuroda
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku,
Tokyo 162-8601, Japan
| | - Takashi Iizumi
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku,
Tokyo 162-8601, Japan
| | - Shunsuke Nagai
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku,
Tokyo 162-8601, Japan
| | - Takashi Katoh
- Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku,
Tokyo 162-8601, Japan
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13
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Anderl T, Nicolas L, Münkemer J, Muthukumar Y, Baro A, Frey W, Sasse F, Taylor RE, Laschat S. Synthesis and Biological Evaluation of Gephyronic Acid Derivatives: Initial Steps towards the Identification of the Biological Target of Polyketide Inhibitors of Eukaryotic Protein Synthesis. European J Org Chem 2011. [DOI: 10.1002/ejoc.201101129] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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14
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Erver F, Hilt G. Multi-component regio- and diastereoselective cobalt-catalyzed hydrovinylation/allylboration reaction sequence. Org Lett 2011; 13:5700-3. [PMID: 21954907 DOI: 10.1021/ol202481j] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The combination of a regioselective cobalt-catalyzed 1,4-hydrovinylation and the diastereoselective allylboronation reaction leads to a wide scope of functionalized hydroxydienyl esters in a one-pot reaction in excellent yields. With catalytic amounts of base, these products are easily converted either into α,β,γ,δ-unsaturated hydroxyl esters or complex tetrasubstituted tetrahydropyrans in chemo- and diastereoselective fashions. In addition, a high-yielding four-component one-pot reaction involving an acrylate, two different and unsymmetrical 1,3-dienes, and an unsaturated aldehyde is presented.
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Affiliation(s)
- Florian Erver
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35043 Marburg, Germany
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15
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Lu Y, Woo SK, Krische MJ. Total synthesis of bryostatin 7 via C-C bond-forming hydrogenation. J Am Chem Soc 2011; 133:13876-9. [PMID: 21780806 DOI: 10.1021/ja205673e] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The marine macrolide bryostatin 7 is prepared in 20 steps (longest linear sequence) and 36 total steps with five C-C bonds formed using hydrogenative methods. This approach represents the most concise synthesis of any bryostatin reported, to date.
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Affiliation(s)
- Yu Lu
- University of Texas at Austin, Department of Chemistry and Biochemistry, 78712, United States
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16
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Mattivi F, Caputi L, Carlin S, Lanza T, Minozzi M, Nanni D, Valenti L, Vrhovsek U. Effective analysis of rotundone at below-threshold levels in red and white wines using solid-phase microextraction gas chromatography/tandem mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2011; 25:483-488. [PMID: 21259356 DOI: 10.1002/rcm.4881] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Rotundone is an oxygenated sesquiterpene belonging to the family of guaianes, giving the 'peppery' aroma to white and black pepper and to red wines. Here we describe a novel, convenient protocol for the synthesis of rotundone, starting from a commercially available compound and requiring only two reaction steps, and an improved, faster method of GC separation (30 min) with selective quantisation of rotundone using tandem mass spectrometry in multiple reaction monitoring (MRM) mode with d(5)-rotundone as internal standard. With limits of detection (LODs) of 1.5 ng/L in white wine and 2.0 ng/L in red wine, intraday repeatability CV values of 6% and 5% at 50 ng/L and 500 ng/L and interday repeatability CV values of 13% and 6% at 50 ng/L and 500 ng/L, respectively, the improved protocol provides the desired sensitivity and selectivity for routine analysis of rotundone in both white and red wines. Initial application of this method highlighted the presence of unexpectedly high concentrations of rotundone, thus explaining the origin of the distinctive peppery aroma in Schioppettino and Vespolina red wines and in Gruener Veltliner white wines.
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Affiliation(s)
- F Mattivi
- IASMA Research and Innovation Centre, Fondazione Edmund Mach, Via E. Mach 1, 38010 S. Michele all'Adige (TN), Italy.
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Qi Y, Ma S. The medicinal potential of promising marine macrolides with anticancer activity. ChemMedChem 2011; 6:399-409. [PMID: 21302362 DOI: 10.1002/cmdc.201000534] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2010] [Revised: 01/08/2011] [Indexed: 12/12/2022]
Abstract
Marine natural products have become a major source of new chemical entities in the discovery of potential anticancer agents that potently suppress various molecular targets. In particular, the marine macrolides, which include an array of novel biomolecules endowed with outstanding cytotoxic and/or antiproliferative activities, are a prominent class of marine natural products that offer continued promise for breakthroughs in anticancer research. Herein we highlight some recent studies of promising marine macrolides, paying particular attention to their discovery, anticancer activities, mechanisms of action, chemical synthesis, and representative analogues.
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Affiliation(s)
- Yunkun Qi
- Department of Medicinal Chemistry, School of Pharmaceutical Sciences, Shandong University, 44, West Culture Road, Jinan 250012, PR China
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18
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Hajare AK, Ravikumar V, Khaleel S, Bhuniya D, Reddy DS. Synthesis of molluscicidal agent cyanolide a macrolactone from D-(-)-pantolactone. J Org Chem 2010; 76:963-6. [PMID: 21192736 DOI: 10.1021/jo101782q] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
An efficient synthesis of potent molluscicidal agent cyanolide A, a glycosidic 16-membered macrolide, starting from D-(-)-pantolactone is reported. Highly stereoselective aldol, oxa-Michael addition, and Yamaguchi macrolactonization are the key steps in the present synthesis.
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19
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Anderl T, Nicolas L, Münkemer J, Baro A, Sasse F, Steinmetz H, Jansen R, Höfle G, Taylor RE, Laschat S. Gephyronic acid, a missing link between polyketide inhibitors of eukaryotic protein synthesis (part II): Total synthesis of gephyronic acid. Angew Chem Int Ed Engl 2010; 50:942-5. [PMID: 21246697 DOI: 10.1002/anie.201005605] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2010] [Indexed: 11/10/2022]
Affiliation(s)
- Timo Anderl
- Institut für Organische Chemie, Universität Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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Szpilman AM, Carreira EM. Probing the Biology of Natural Products: Molecular Editing by Diverted Total Synthesis. Angew Chem Int Ed Engl 2010; 49:9592-628. [DOI: 10.1002/anie.200904761] [Citation(s) in RCA: 150] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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21
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Szpilman AM, Carreira EM. Untersuchung der Biologie von Naturstoffen: systematische Strukturvariation durch umgelenkte Totalsynthese. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200904761] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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22
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Keck GE, Poudel YB, Rudra A, Stephens JC, Kedei N, Lewin NE, Peach ML, Blumberg PM. Molecular modeling, total synthesis, and biological evaluations of C9-deoxy bryostatin 1. Angew Chem Int Ed Engl 2010; 49:4580-4. [PMID: 20491108 PMCID: PMC3269168 DOI: 10.1002/anie.201001200] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Gary E. Keck
- Department of Chemistry, University of Utah, 315 South 1400 East, Rm 2020, Salt Lake City, UT 84112 (USA), Fax: (+1) 801-585-0024
| | - Yam B. Poudel
- Department of Chemistry, University of Utah, 315 South 1400 East, Rm 2020, Salt Lake City, UT 84112 (USA), Fax: (+1) 801-585-0024
| | - Arnab Rudra
- Department of Chemistry, University of Utah, 315 South 1400 East, Rm 2020, Salt Lake City, UT 84112 (USA), Fax: (+1) 801-585-0024
| | - Jeffrey C. Stephens
- Department of Chemistry, University of Utah, 315 South 1400 East, Rm 2020, Salt Lake City, UT 84112 (USA), Fax: (+1) 801-585-0024
| | - Noemi Kedei
- Laboratory for Cancer Biology and Genetics, CCR, NCI, NIH, Bethesda, MD 20892 (USA)
| | - Nancy E. Lewin
- Laboratory for Cancer Biology and Genetics, CCR, NCI, NIH, Bethesda, MD 20892 (USA)
| | - Megan L. Peach
- Basic Research Program SAIC-Frederick, Inc., NCI-Frederick, Frederick, MD 21702 (USA)
| | - Peter M. Blumberg
- Laboratory for Cancer Biology and Genetics, CCR, NCI, NIH, Bethesda, MD 20892 (USA)
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Keck G, Poudel Y, Rudra A, Stephens J, Kedei N, Lewin N, Peach M, Blumberg P. Molecular Modeling, Total Synthesis, and Biological Evaluations of C9-Deoxy Bryostatin 1. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201001200] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Lu Y, Krische MJ. Concise synthesis of the bryostatin A-ring via consecutive C-C bond forming transfer hydrogenations. Org Lett 2009; 11:3108-11. [PMID: 19586066 DOI: 10.1021/ol901096d] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Under the conditions of C-C bond forming transfer hydrogenation, 1,3-propanediol 1 engages in double asymmetric carbonyl allylation to furnish the C(2)-symmetric diol 2. Double ozonolysis of 2 followed by TBS protection delivers aldehyde 3, which is subject to catalyst directed carbonyl reverse prenylation via transfer hydrogenation to deliver neopentyl alcohol 4 and, ultimately, the bryostatin A-ring 7. Through use of two consecutive C-C bond forming transfer hydrogenations, the Evans' bryostatin A-ring 7 is prepared in less than half the manipulations previously reported.
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Affiliation(s)
- Yu Lu
- University of Texas at Austin, Department of Chemistry and Biochemistry, Austin, Texas 78712, USA
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Keck GE, Poudel YB, Welch DS, Kraft MB, Truong AP, Stephens JC, Kedei N, Lewin NE, Blumberg PM. Substitution on the A-ring confers to bryopyran analogues the unique biological activity characteristic of bryostatins and distinct from that of the phorbol esters. Org Lett 2009; 11:593-6. [PMID: 19113896 DOI: 10.1021/ol8027253] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A close structural analogue of bryostatin 1, which differs from bryostatin 1 only by the absence of the C(30) carbomethoxy group (on the C(13) enoate of the B-ring), has been prepared by total synthesis. Biological assays reveal a crucial role for substitution in the bryostatin 1 A-ring in conferring those responses which are characteristic of bryostatin 1 and distinct from those observed with PMA.
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Affiliation(s)
- Gary E Keck
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah 84112, USA
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Keck GE, Giles RL, Cee VJ, Wager CA, Yu T, Kraft MB. Total synthesis of epothilones B and D: stannane equivalents for beta-keto ester dianions. J Org Chem 2008; 73:9675-91. [PMID: 18991385 PMCID: PMC2736362 DOI: 10.1021/jo802215v] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Studies leading to a total synthesis of epothilones B and D are described. The overall synthetic plan was based on late-stage fragment assembly of two segments representing C(1)-C(9) and C(10)-C(21) of the structure. The C(1)-C(9) fragment was prepared by elaboration of commercially available (2R)-3-hydroxy-2-methylpropanoate at both ends of the three-carbon unit. Introduction of carbons 1-4 containing the gem-dimethyl unit was achieved in a convergent manner using a diastereoselective addition of a stannane equivalent of a beta-keto ester dianion. An enantioselective addition of such a stannane equivalent for a beta-keto ester dianion was also used to fashion one version of the C(10)-C(21) subunit; however, the fragment assembly (using bimolecular esterification followed by ring-closing metathesis) with this subunit failed. Therefore, fragment assembly was achieved using a Wittig reaction; this was followed by macrolactonization to close the macrocycle. The C(10)-C(21) subunit needed for this approach was prepared in an efficient manner using the Corey-Kim reaction as a key element. Other key reactions in the synthesis include a stereoselective SmI(2) reduction of a beta-hydroxy ketone and a critical opening of a valerolactone with aniline which required extensive investigation.
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Affiliation(s)
- Gary E Keck
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah, 84112, USA.
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27
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Keck GE, Kraft MB, Truong AP, Li W, Sanchez CC, Kedei N, Lewin NE, Blumberg PM. Convergent assembly of highly potent analogues of bryostatin 1 via pyran annulation: bryostatin look-alikes that mimic phorbol ester function. J Am Chem Soc 2008; 130:6660-1. [PMID: 18452293 DOI: 10.1021/ja8022169] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Highly potent bryostatin analogues which contain the complete bryostatin core structure have been synthesized using a pyran annulation approach as a key strategic element. The A ring pyran was assembled using a pyran annulation reaction between a C1-C8 hydroxy allylsilane and an aldehyde comprising C9-C13. This pyran was transformed to a new hydroxy allylsilane and then coupled with a preformed C ring aldehyde subunit in a second pyran annulation, with concomitant formation of the B ring. This tricyclic intermediate was elaborated to bryostatin analogues which displayed nanomolar to subnanomolar affinity for PKC, but displayed properties indistinguishable from a phorbol ester in a proliferation/attachment assay.
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Affiliation(s)
- Gary E Keck
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah 84112, USA.
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28
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Tsai AS, Bergman RG, Ellman JA. Asymmetric synthesis of (-)-incarvillateine employing an intramolecular alkylation via Rh-catalyzed olefinic C-H bond activation. J Am Chem Soc 2008; 130:6316-7. [PMID: 18444613 DOI: 10.1021/ja8012159] [Citation(s) in RCA: 92] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An asymmetric total synthesis of (-)-incarvillateine, a natural product having potent analgesic properties, has been achieved in 11 steps and 15.4% overall yield. The key step is a rhodium-catalyzed intramolecular alkylation of an olefinic C-H bond to set two stereocenters. Additionally, this transformation produces an exocyclic, tetrasubstituted alkene through which the bicyclic piperidine moiety can readily be accessed.
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Affiliation(s)
- Andy S Tsai
- Department of Chemistry, University of California, Berkeley, California 94720, USA
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29
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Heumann LV, Keck GE. A new construction of 2-alkoxypyrans by an acylation-reductive cyclization sequence. Org Lett 2007; 9:1951-4. [PMID: 17428064 PMCID: PMC2516373 DOI: 10.1021/ol070573h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new convergent synthetic approach to a pyran motif common to many naturally occurring structures is described. In this approach, two fragments are joined by esterification, and a subsequent intramolecular reductive cyclization affords the 2-hydroxypyran.
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Affiliation(s)
- Lars V Heumann
- Department of Chemistry, University of Utah, Salt Lake City, UT 84112-0850, USA
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30
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Trost BM, Yang H, Thiel OR, Frontier AJ, Brindle CS. Synthesis of a ring-expanded bryostatin analogue. J Am Chem Soc 2007; 129:2206-7. [PMID: 17279751 PMCID: PMC2533160 DOI: 10.1021/ja067305j] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305, USA.
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31
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Keck GE, Welch DS, Poudel YB. Synthetic Studies Toward Bryostatin 1: Preparation of a C(1)-C(16) Fragment by Pyran Annulation. Tetrahedron Lett 2006; 47:8267-8270. [PMID: 17404602 PMCID: PMC1847416 DOI: 10.1016/j.tetlet.2006.09.094] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
An expeditious assembly of a C(1)-C(16) subunit of bryostatin 1 is described. A pyran annulation reaction was utilized to form the B-ring by reaction of a hydroxy-allylsilane with a fully elaborated A-ring subunit. This annulation process proceeded with complete diastereoselectivity and in excellent isolated yield despite the presence of potentially sensitive functionality in the A-ring segment.
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Affiliation(s)
- Gary E Keck
- Department of Chemistry, University of Utah, 315 South 1400 East, RM 2020, Salt Lake City, Utah 84112-0850, USA
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