1
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Trost BM, Wang Y, Buckl AK, Huang Z, Nguyen MH, Kuzmina O. Total synthesis of bryostatin 3. Science 2020; 368:1007-1011. [PMID: 32467391 DOI: 10.1126/science.abb7271] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2020] [Accepted: 04/22/2020] [Indexed: 12/24/2022]
Abstract
Bryostatins are a family of 21 complex marine natural products with a wide range of potent biological activities. Among all the 21 bryostatins, bryostatin 3 is structurally the most complex. Whereas nine total syntheses of bryostatins have been achieved to date, bryostatin 3 has only been targeted once and required the highest number of steps to synthesize (43 steps in the longest linear sequence and 88 total steps). Here, we report a concise total synthesis of bryostatin 3 using 22 steps in the longest linear sequence and 31 total steps through a highly convergent synthetic plan by the use of highly atom-economical and chemoselective transformations in which alkynes played a major role in reducing step count.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
| | - Youliang Wang
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
| | - Andreas K Buckl
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
| | - Zhongxing Huang
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
| | - Minh H Nguyen
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
| | - Olesya Kuzmina
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA
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2
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Bera S, Chatterjee B, Mondal D. Advances in the Asymmetric Synthesis of Bridged and Fused Bicyclic Acetals. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800904] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Smritilekha Bera
- School of Chemical Sciences; Central University of Gujarat; 382030 Gandhinagar Gujarat India
| | - Bhaskar Chatterjee
- Department of Chemistry, Nabadwip; Vidyasagar College; 741302 Nabadwip West Bengal India
| | - Dhananjoy Mondal
- School of Chemical Sciences; Central University of Gujarat; 382030 Gandhinagar Gujarat India
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3
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Heravi MM, Ahmadi T, Ghavidel M, Heidari B, Hamidi H. Recent applications of the hetero Diels–Alder reaction in the total synthesis of natural products. RSC Adv 2015. [DOI: 10.1039/c5ra17488k] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The synthetic utility and potential power of the Diels–Alder (D–A) reaction in organic chemistry is evident.
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Affiliation(s)
| | | | | | | | - Hoda Hamidi
- Department of Chemistry
- Alzahra University
- Tehran
- Iran
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4
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Gao L, Lu J, Song Z. Recent efforts to construct the B-ring of bryostatins. Chem Commun (Camb) 2014; 49:10211-20. [PMID: 24051556 DOI: 10.1039/c3cc45947k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Among macrocyclic natural products, bryostatins have excellent bioactivities and unique structures that make them highly attractive to synthetic chemists. Particularly challenging for the total synthesis of bryostatins is the B-ring, which features a cis-tetrahydropyran containing a geometrically defined exocyclic Z-methyl enoate. Synthetic chemists have recently displayed great prowess in their efforts to construct this ring, and here we summarize the progress towards this goal.
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Affiliation(s)
- Lu Gao
- Key Laboratory of Drug-Targeting and Drug Delivery System of the Education Ministry, Department of Medicinal Chemistry, West China School of Pharmacy, Sichuan University, Chengdu, 610041, China.
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5
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Wender PA, Donnelly AC, Loy BA, Near KE, Staveness D. Rethinking the Role of Natural Products: Function-Oriented Synthesis, Bryostatin, and Bryologs. METHODS AND PRINCIPLES IN MEDICINAL CHEMISTRY 2014. [DOI: 10.1002/9783527676545.ch14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Yadav J, Aravind S, Mahesh Kumar G, Subba Reddy B. Synthetic studies toward potent cytostatic macrolide bryostatin: an expedient synthesis of C1–C10 fragment. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.07.043] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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8
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Bondalapati S, Gogoi P, Indukuri K, Saikia AK. Diastereoselective Synthesis of Substituted Tetrahydrothiopyrans via (3,5)-Thionium–Ene Cyclization Reaction. J Org Chem 2012; 77:2508-12. [DOI: 10.1021/jo2023944] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Somasekhar Bondalapati
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Paramartha Gogoi
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Kiran Indukuri
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Anil K. Saikia
- Department
of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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9
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Saha P, Bhunia A, Saikia AK. Synthesis of 2,3,5,6-tetrasubstituted tetrahydropyrans via (3,5)-oxonium-ene reaction. Org Biomol Chem 2012; 10:2470-81. [DOI: 10.1039/c2ob06832j] [Citation(s) in RCA: 19] [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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10
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Wender PA, Reuber J. Function Oriented Synthesis: Preparation and Initial Biological Evaluation of New A-Ring-Modified Bryologs. Tetrahedron 2011; 67:9998-10005. [PMID: 22247574 DOI: 10.1016/j.tet.2011.09.058] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The synthesis and biological evaluation of the first members of a new series of designed bryostatin A-ring analogues (bryologs) are described. An advanced intermediate is produced that allows for step economical access to diverse analogs. The first of these analogues, bearing side chains of completely different polarities from alkyl to hydroxyl and carboxyl functionalities, were evaluated. All exhibit potent protein kinase C binding (54.7 to 2.4 nM) with affinities increasing with decreasing side chain polarity. This series of bryostatin analogues demonstrates that A ring surrogates can indeed be used for tuning pharmacophore and ADME characteristics as needed to improve bryolog function.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Department of Chemical and Systems Biology, Stanford University, Stanford, California 94305-5080, USA
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11
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Trost BM, Yang H, Dong G. Total syntheses of bryostatins: synthesis of two ring-expanded bryostatin analogues and the development of a new-generation strategy to access the C7-C27 fragment. Chemistry 2011; 17:9789-805. [PMID: 21780195 PMCID: PMC3517064 DOI: 10.1002/chem.201002932] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 04/26/2011] [Indexed: 11/06/2022]
Abstract
Herein, we report the synthesis of novel ring-expanded bryostatin analogues. By carefully modifying the substrate, a selective and high-yielding Ru-catalyzed tandem enyne coupling/Michael addition was employed to construct the northern fragment. Ring-closing metathesis was utilized to form the 31-membered ring macrocycle of the analogue. These ring-expanded bryostatin analogues possess anticancer activity against several cancer cell lines. Given the difficulty in forming the C16-C17 olefin at a late stage, we also describe our development of a new-generation strategy to access the C7-C27 fragment, containing both the ring B and C subunits.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305, USA.
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12
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Trost BM, Yang H, Brindle CS, Dong G. Atom-economic and stereoselective syntheses of the ring a and B subunits of the bryostatins. Chemistry 2011; 17:9777-88. [PMID: 21774000 DOI: 10.1002/chem.201002930] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2010] [Revised: 04/21/2011] [Indexed: 11/06/2022]
Abstract
This article describes chemoselective and atom-economic methods for the stereoselective assembly of the ring A and B subunits of bryostatins. A Ru-catalyzed tandem alkene-alkyne coupling/Michael addition reaction was developed and applied to the synthesis of bryostatin ring B. We explored an acetylide-mediated epoxide-opening/6-exo-dig cyclization route to access the bryostatin ring A, although ring A was eventually furnished through an acid-catalyzed tandem transketalization/ketalization sequence. In addition, a dinuclear zinc-catalyzed methyl vinyl ketone (MVK) aldol strategy was evaluated for the construction of the polyacetate moiety. Utilization of these methods ultimately led to the rapid assembly of the northern bryostatin fragment containing both the ring A and B subunits.
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
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Abstract
The total synthesis of bryostatin 9 was accomplished using a uniquely step-economical and convergent Prins-driven macrocyclization strategy. At 25 linear and 42 total steps, this is currently the most concise and convergent synthesis of a potent bryostatin.
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Affiliation(s)
- Paul A Wender
- Department of Chemistry, Stanford University, Stanford, California 94305-5080, USA.
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Abstract
We have discovered a photocatalytic intramolecular hetero-Diels-Alder reaction of tethered bis(enones). This transformation involves the intermediacy of an enone radical anion and constitutes the formal coupling of an electron-deficient heterodiene with an electronically mismatched enone dienophile. The diastereoselectivity and regioselectivity of the process are high, and the dihydropyran products are amenable to a variety of synthetically useful transformations.
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15
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Wender PA, Loy BA, Schrier AJ. Translating Nature's Library: The Bryostatins and Function-Oriented Synthesis. Isr J Chem 2011; 51:453-472. [PMID: 22661768 PMCID: PMC3364006 DOI: 10.1002/ijch.201100020] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We review in part our computational, design, synthesis, and biological studies on a remarkable class of compounds and their designed analogs that have led to preclinical candidates for the treatment of cancer, a first-in-class approach to Alzheimer's disease, and a promising strategy to eradicate HIV/AIDS. Because these leads target, in part, protein kinase C (PKC) isozymes, they have therapeutic potential even beyond this striking set of therapeutic indications. This program has given rise to new synthetic methodology and represents an increasingly important direction of synthesis focused on achieving function through synthesis-informed design (function-oriented synthesis).
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Affiliation(s)
- Paul A. Wender
- Department of Chemistry Department of Chemical and Systems Biology Stanford University Stanford, CA 94305, USA
| | - Brian A. Loy
- Department of Chemistry Department of Chemical and Systems Biology Stanford University Stanford, CA 94305, USA
| | - Adam J. Schrier
- Department of Chemistry Department of Chemical and Systems Biology Stanford University Stanford, CA 94305, USA
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16
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Schmidt B, Staude L. Desymmetrization of (R,R)-Hexa-1,5-diene-3,4-diol via Monofunctionalization and Rhodium-Catalyzed Allylic Substitution. J Org Chem 2011; 76:2220-6. [DOI: 10.1021/jo2001337] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Bernd Schmidt
- Institut fuer Chemie (Organische Synthesechemie), Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
| | - Lucia Staude
- Institut fuer Chemie (Organische Synthesechemie), Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Potsdam-Golm, Germany
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17
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Schmidt B, Staude L, Kelling A, Schilde U. A Cross-Metathesis-Conjugate Addition Route to Enantiopure γ-Butyrolactams and γ-Lactones from a C2-Symmetric Precursor. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001528] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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19
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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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20
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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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21
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Zörb A, Brückner R. Conversion of Conjugated Enones into Enantiomerically Pure -Hydroxy Ketones or 1,3-Diols - Samarium(II) Bromide Reductions of Protected ,-Dihydroxy Ketones. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000279] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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22
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Hale KJ, Manaviazar S. New approaches to the total synthesis of the bryostatin antitumor macrolides. Chem Asian J 2010; 5:704-54. [PMID: 20354984 DOI: 10.1002/asia.200900634] [Citation(s) in RCA: 103] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
In this Focus Review, we give an overview of various bryostatin total syntheses. We also discuss the synthesis of various bryostatin analogues and their biological activity. Work reviewed includes that of Masamune, Evans, Nishiyama and Yamamura, Hale and Manaviazar, Trost, Wender, Keck, Burke, Thomas, and Krische. Our coverage is primarily for the period 2001-2009, since detailed reviews already exist on bryostatin total synthesis work and biology up to this time.
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Affiliation(s)
- Karl J Hale
- School of Chemistry & Chemical Engineering, Queen's Universty Belfast, Stranmillis Road, Belfast BT9 5AG, Northern Ireland, UK.
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23
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Affiliation(s)
- Bernd Schmidt
- Institut fuer Chemie, Organische Synthesechemie, Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Golm, Germany
| | - Oliver Kunz
- Institut fuer Chemie, Organische Synthesechemie, Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Golm, Germany
| | - Anne Biernat
- Institut fuer Chemie, Organische Synthesechemie, Universitaet Potsdam, Karl-Liebknecht-Strasse 24-25, D-14476 Golm, Germany
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24
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Fu R, Du Y, Li ZY, Xu WX, Huang PQ. Asymmetric syntheses of 6-deoxyfagomin, d-deoxyrhamnojirimycin, and d-rhamnono-1,5-lactam. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.09.083] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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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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Reddy UC, Bondalapati S, Saikia AK. Stereoselective One-Pot, Three-Component Synthesis of 4-Aryltetrahydropyran via Prins−Friedel−Crafts Reaction. J Org Chem 2009; 74:2605-8. [PMID: 19216514 DOI: 10.1021/jo802531h] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- U. C. Reddy
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - S. Bondalapati
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
| | - Anil K. Saikia
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati 781039, India
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28
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Meng J, Zhao YL, Ren CQ, Li Y, Li Z, Liu Q. Highly Efficient Access to Bi- and Tricyclic Ketals through Gold-Catalyzed Tandem Reactions of 4-Acyl-1,6-diynes. Chemistry 2009; 15:1830-4. [DOI: 10.1002/chem.200802304] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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29
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C. Majumdar K, Muhuri S, Ul Islam R, Chattopadhyay B. Synthesis of Five- and Six-Membered Heterocyclic Compounds by the Application of the Metathesis Reactions. HETEROCYCLES 2009. [DOI: 10.3987/rev-08-646] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Abstract
Drug discovery from marine natural products has enjoyed a renaissance in the past few years. Ziconotide (Prialt; Elan Pharmaceuticals), a peptide originally discovered in a tropical cone snail, was the first marine-derived compound to be approved in the United States in December 2004 for the treatment of pain. Then, in October 2007, trabectedin (Yondelis; PharmaMar) became the first marine anticancer drug to be approved in the European Union. Here, we review the history of drug discovery from marine natural products, and by describing selected examples, we examine the factors that contribute to new discoveries and the difficulties associated with translating marine-derived compounds into clinical trials. Providing an outlook into the future, we also examine the advances that may further expand the promise of drugs from the sea.
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31
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Marvin CC, Voight EA, Suh JM, Paradise CL, Burke SD. Synthesis of (+)-didemniserinolipid B: application of a 2-allyl-4-fluorophenyl auxiliary for relay ring-closing metathesis. J Org Chem 2008; 73:8452-7. [PMID: 18811201 DOI: 10.1021/jo801666t] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis of didemniserinolipid B utilizing a ketalization/ring-closing metathesis (K/RCM) strategy is described. In the course of this work, a novel 2-allyl-4-fluorophenyl auxiliary for relay ring-closing metathesis (RRCM) was developed, which increased the yield of the RCM. The resulting 6,8-dioxabicyclo[3.2.1]octene core was selectively functionalized by complimentary dihydroxylation and epoxidation routes to install the C10 axial alcohol. This bicyclic ketal core was further functionalized by etherification and an alkene cross metathesis with an unsaturated alpha-phenylselenyl ester en route to completing the total synthesis.
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Affiliation(s)
- Christopher C Marvin
- Department of Chemistry, University of Wisconsin-Madison,1101 University Avenue, Madison, Wisconsin 53706-1322, USA
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32
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Marvin CC, Clemens AJL, Burke SD. Synthesis of Thromboxane B2 via Ketalization/Ring-Closing Metathesis. Org Lett 2007; 9:5353-6. [DOI: 10.1021/ol7021214] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher C. Marvin
- Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706-1322
| | - Alexander J. L. Clemens
- Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706-1322
| | - Steven D. Burke
- Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706-1322
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33
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Marvin CC, Voight EA, Burke SD. Synthesis of (+)-Didemniserinolipid B via Ketalization/Ring-Closing Metathesis. Org Lett 2007; 9:5357-9. [DOI: 10.1021/ol702454m] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Christopher C. Marvin
- Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706-1322
| | - Eric A. Voight
- Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706-1322
| | - Steven D. Burke
- Department of Chemistry, University of WisconsinMadison, 1101 University Avenue, Madison, Wisconsin 53706-1322
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Keck GE, Welch DS, Vivian PK. Synthetic studies toward the bryostatins: a substrate-controlled approach to the A-ring. Org Lett 2007; 8:3667-70. [PMID: 16898787 PMCID: PMC2516405 DOI: 10.1021/ol061173h] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The synthesis of a C1-C13 A-ring subunit of bryostatin 1 is detailed. The key features of the approach include the convergent fragment assembly with a highly stereoselective construction of the C7-C8 bond indicated above.
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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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35
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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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36
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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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37
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Cho CW, Krische MJ. Enantioselective reductive coupling of alkynes and alpha-keto aldehydes via rhodium-catalyzed hydrogenation: an approach to bryostatin substructures. Org Lett 2006; 8:891-4. [PMID: 16494467 DOI: 10.1021/ol052976s] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Hydrogen-mediated reductive coupling of glyoxal 2 and 1,3-enyne 3 provides alpha-hydroxy ketone 4 in 70% yield and 91% enantiomeric excess. Notably, the benzylic ether and diene side chain of 4 remain intact under the conditions of hydrogen-mediated coupling. In four steps, alpha-hydroxy ketone 4 is converted to pyrans 8 and 9, which embody key structural features of the bryostatin recognition domain.
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Affiliation(s)
- Chang-Woo Cho
- University of Texas at Austin, Department of Chemistry and Biochemistry, Austin, Texas 78712, USA
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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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Manaviazar S, Frigerio M, Bhatia GS, Hummersone MG, Aliev AE, Hale KJ. Enantioselective Formal Total Synthesis of the Antitumor Macrolide Bryostatin 7. Org Lett 2006; 8:4477-80. [PMID: 16986929 DOI: 10.1021/ol061626i] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A new enantioselective synthesis of Masamune's AB fragment (1) for bryostatin 7 is described. Key steps in the new route include a Meerwein-Ponndorf-Verley reduction to set the O(7) stereocenter and an alkylative union between the dithiane 6 and iodide 5 to construct the C(9)-C(10) bond. Because we have previously published a synthesis of Masamune's C-ring phenyl sulfone 2, our new route to 1 constitutes a formal total synthesis of bryostatin 7; it also corrects the previously reported spectral data for 1 in CDCl3.
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Affiliation(s)
- Soraya Manaviazar
- UCL Center for Chemical Genomics, Christopher Ingold Laboratories, Chemistry Department, University College London, 20 Gordon Street, London WC1H 0AJ, UK.
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41
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2004. Coord Chem Rev 2006. [DOI: 10.1016/j.ccr.2005.10.020] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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42
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Clarke PA, Santos S. Strategies for the Formation of Tetrahydropyran Rings in the Synthesis of Natural Products. European J Org Chem 2006. [DOI: 10.1002/ejoc.200500964] [Citation(s) in RCA: 280] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Paul A. Clarke
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Address from January 1, 2006: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Soraia Santos
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
- Address from January 1, 2006: Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
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43
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Keck GE, Truong AP. Synthetic studies on the bryostatins: preparation of a truncated BC-ring intermediate by pyran annulation. Org Lett 2006; 7:2149-52. [PMID: 15901156 PMCID: PMC1480406 DOI: 10.1021/ol050511w] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
[reaction: see text]. A synthesis of a potential BC-ring subunit (C9-C27) for bryostatin 1, a remarkably potent anticancer agent, has been developed in 16 steps and 18% overall yield. The key features of this route include a BITIP-catalyzed asymmetric allylation reaction, chelation-controlled allylations, a hydroformylation reaction, and a pyran annulation reaction.
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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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44
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Six-membered ring systems: with O and/or S atoms. ACTA ACUST UNITED AC 2005. [DOI: 10.1016/s0959-6380(05)80337-x] [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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