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Bhamboo P, Bera S, Mondal D. TiCl
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‐Promoted Asymmetric Aldol Reaction of Oxazolidinones and its Sulphur‐Congeners for Natural Product Synthesis. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100432] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Prateek Bhamboo
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
| | - Smritilekha Bera
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
| | - Dhananjoy Mondal
- School of Chemical Sciences Central University of Gujarat Gandhinagar 382030 Gujarat India
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2
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Fukuda H, Ikeda H, Muromoto R, Hirashima K, Ishimura K, Fujiwara K, Aoki-Saito H, Hisada T, Watanabe M, Ishihara J, Matsuda T, Shuto S. Synthesis of Resolvin E3, a Proresolving Lipid Mediator, and Its Deoxy Derivatives: Identification of 18-Deoxy-resolvin E3 as a Potent Anti-Inflammatory Agent. J Org Chem 2020; 85:14190-14200. [PMID: 32942849 DOI: 10.1021/acs.joc.0c01701] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We synthesized RvE3 and its deoxy derivatives, 17-deoxy-RvE3 and 18-deoxy-RvE3, by a common route via Sonogashira coupling as a key step. The evaluation of their anti-inflammatory activities revealed that 18-deoxy-RvE3 was remarkably more potent than the parent RvE3 and significantly active at a 300 fg dose in mice; additionally, 17-deoxy-RvE3 was significantly less potent than the parent RvE3. For the first time, we found that the 17-hydroxy group of RvE3 is very important for anti-inflammatory activity.
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Affiliation(s)
- Hayato Fukuda
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Hiroyuki Ikeda
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Ryuta Muromoto
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Koki Hirashima
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Kohei Ishimura
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Koichi Fujiwara
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Haruka Aoki-Saito
- Department of Respiratory Medicine, Gunma University Graduate School of Medicine, Showa-machi, Maebashi 371-8511, Japan
| | - Takeshi Hisada
- Department of Respiratory Medicine, Gunma University Graduate School of Medicine, Showa-machi, Maebashi 371-8511, Japan
| | - Mizuki Watanabe
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Jun Ishihara
- Graduate School of Biomedical Sciences, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan
| | - Tadashi Matsuda
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
| | - Satoshi Shuto
- Faculty of Pharmaceutical Sciences, Hokkaido University, Kita-12, Nishi-6, Kita-ku, Sapporo 060-0812, Japan
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3
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Lekky A, Ruengsatra T, Ruchirawat S, Ploypradith P. Stereoselective Convergent Synthesis of Tetrahydro-5 H-benzo[ c]fluorene via Nine-Membered Ring-Closing Metathesis and Transannular Acid-Mediated Cyclization/Nucleophilic Addition. J Org Chem 2019; 84:5277-5291. [PMID: 30870589 DOI: 10.1021/acs.joc.9b00263] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The diene methyl ethers or acetates, constructed from the Li-Br exchange/addition reactions of 2-vinylbenzaldehydes and 2-(but-3-en-1-yl)bromoarenes followed by etherification or acetylation of the corresponding alcohols, smoothly underwent the ring-closing metathesis (RCM) by using Hoveyda-Grubbs II as a catalyst to provide the corresponding benzannulated ( Z)-cyclononenes as single products in good yields (up to 75%). The ensuing one-pot acid-mediated transannular cyclization/nucleophilic addition at C7 furnished the corresponding tetrahydro-5 H-benzo[ c]fluorenes as single stereoisomers with the exclusive cis stereochemistry at the ring junction (C5-C6) and trans at the site of nucleophilic attack (C6-C7) on the three contiguous stereogenic centers in good to excellent yield (up to 94%). The developed strategy was general; the reaction conditions were compatible with hydride, azide, and electron-rich aromatics as nucleophiles. In addition, various methoxylated benzannulated cyclononene acetates could be employed as substrates. Thus, tetrahydro-5 H-benzo[ c]fluorenes could be prepared in four steps from appropriately substituted bromoarenes and benzaldehydes in good yields (up to 56%) with excellent stereo- and regio-control.
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Affiliation(s)
| | | | - Somsak Ruchirawat
- Centre of Excellence on Environmental Health and Toxicology , Commission on Higher Education (CHE), Ministry of Education , Bangkok 10400 , Thailand
| | - Poonsakdi Ploypradith
- Centre of Excellence on Environmental Health and Toxicology , Commission on Higher Education (CHE), Ministry of Education , Bangkok 10400 , Thailand
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Lim C, Ahn J, Sim J, Yun H, Hur J, An H, Jang J, Lee S, Suh YG. Total synthesis of (+)-brasilenyne via concise construction of an oxonane framework containing a 1,3-cis,cis-diene. Chem Commun (Camb) 2018; 54:467-470. [DOI: 10.1039/c7cc08329g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The enantioselective total synthesis of (+)-brasilenyne, which has a unique oxonane framework containing a 1,3-cis,cis-diene, has been accomplished.
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Affiliation(s)
- Changjin Lim
- College of Pharmacy
- CHA University
- Pocheon-si
- Republic of Korea
- College of Pharmacy
| | - Jungmin Ahn
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Jaehoon Sim
- College of Pharmacy
- CHA University
- Pocheon-si
- Republic of Korea
- College of Pharmacy
| | - Hwayoung Yun
- College of Pharmacy
- Pusan National University
- Busan 46241
- Republic of Korea
| | - Joonseong Hur
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Hongchan An
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Jaebong Jang
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Seungbeom Lee
- College of Pharmacy
- Seoul National University
- Gwanak-gu
- Republic of Korea
| | - Young-Ger Suh
- College of Pharmacy
- CHA University
- Pocheon-si
- Republic of Korea
- College of Pharmacy
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Chung WJ, Vanderwal CD. Stereoselective Halogenation in Natural Product Synthesis. Angew Chem Int Ed Engl 2016; 55:4396-434. [PMID: 26833878 PMCID: PMC6028003 DOI: 10.1002/anie.201506388] [Citation(s) in RCA: 197] [Impact Index Per Article: 24.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2015] [Revised: 08/27/2015] [Indexed: 01/23/2023]
Abstract
At last count, nearly 5000 halogenated natural products have been discovered. In approximately half of these compounds, the carbon atom to which the halogen is bound is sp(3) -hybridized; therefore, there are an enormous number of natural products for which stereocontrolled halogenation must be a critical component of any synthesis strategy. In this Review, we critically discuss the methods and strategies used for stereoselective introduction of halogen atoms in the context of natural product synthesis. Using the successes of the past, we also attempt to identify gaps in our synthesis technology that would aid the synthesis of halogenated natural products, as well as existing methods that have not yet seen application in complex molecule synthesis. The chemistry described herein demonstrates yet again how natural products continue to provide the inspiration for critical advances in chemical synthesis.
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Affiliation(s)
- Won-jin Chung
- Department of Chemistry, Gwangju Institute of Science and Technology, Gwangju, South Korea.
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6
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Chung WJ, Vanderwal CD. Stereoselektive Halogenierungen in der Naturstoffsynthese. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201506388] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Won-jin Chung
- Department of Chemistry; Gwangju Institute of Science and Technology; Gwangju Südkorea
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Heravi MM, Zadsirjan V, Farajpour B. Applications of oxazolidinones as chiral auxiliaries in the asymmetric alkylation reaction applied to total synthesis. RSC Adv 2016. [DOI: 10.1039/c6ra00653a] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In this review, a number of applications of chiral oxazolidinones in the asymmetric alkylation reaction applied to total synthesis are described.
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Affiliation(s)
- Majid M. Heravi
- Department of Chemistry
- School of Science
- Alzahra University
- Tehran
- Iran
| | - Vahideh Zadsirjan
- Department of Chemistry
- School of Science
- Alzahra University
- Tehran
- Iran
| | - Behnaz Farajpour
- Department of Chemistry
- School of Science
- Alzahra University
- Tehran
- Iran
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Harizani M, Ioannou E, Roussis V. The Laurencia Paradox: An Endless Source of Chemodiversity. PROGRESS IN THE CHEMISTRY OF ORGANIC NATURAL PRODUCTS 2016; 102:91-252. [PMID: 27380407 DOI: 10.1007/978-3-319-33172-0_2] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Nature, the most prolific source of biological and chemical diversity, has provided mankind with treatments for health problems since ancient times and continues to be the most promising reservoir of bioactive chemicals for the development of modern drugs. In addition to the terrestrial organisms that still remain a promising source of new bioactive metabolites, the marine environment, covering approximately 70% of the Earth's surface and containing a largely unexplored biodiversity, offers an enormous resource for the discovery of novel compounds. According to the MarinLit database, more than 27,000 metabolites from marine macro- and microorganisms have been isolated to date providing material and key structures for the development of new products in the pharmaceutical, food, cosmeceutical, chemical, and agrochemical sectors. Algae, which thrive in the euphotic zone, were among the first marine organisms that were investigated as sources of food, nutritional supplements, soil fertilizers, and bioactive metabolites.Red algae of the genus Laurencia are accepted unanimously as one of the richest sources of new secondary metabolites. Their cosmopolitan distribution, along with the chemical variation influenced to a significant degree by environmental and genetic factors, have resulted in an endless parade of metabolites, often featuring multiple halogenation sites.The present contribution, covering the literature until August 2015, offers a comprehensive view of the chemical wealth and the taxonomic problems currently impeding chemical and biological investigations of the genus Laurencia. Since mollusks feeding on Laurencia are, in many cases, bioaccumulating, and utilize algal metabolites as chemical weaponry against natural enemies, metabolites of postulated dietary origin of sea hares that feed on Laurencia species are also included in the present review. Altogether, 1047 secondary metabolites, often featuring new carbocyclic skeletons, have been included.The chapter addresses: (1) the "Laurencia complex", the botanical description and the growth and population dynamics of the genus, as well as its chemical diversity and ecological relations; (2) the secondary metabolites, which are organized according to their chemical structures and are classified into sesquiterpenes, diterpenes, triterpenes, acetogenins, indoles, aromatic compounds, steroids, and miscellaneous compounds, as well as their sources of isolation which are depicted in tabulated form, and (3) the biological activity organized according to the biological target and the ecological functions of Laurencia metabolites.
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Affiliation(s)
- Maria Harizani
- Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, 15771, Greece
| | - Efstathia Ioannou
- Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, 15771, Greece.
| | - Vassilios Roussis
- Department of Pharmacognosy and Chemistry of Natural Products, Faculty of Pharmacy, National and Kapodistrian University of Athens, Panepistimiopolis Zografou, Athens, 15771, Greece.
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9
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Applications of sodium borohydride procedure for the reductive removal of Evans and other chiral auxiliaries. Tetrahedron 2016. [DOI: 10.1016/j.tet.2015.09.076] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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Li Y, Chen J, Qiu R, Wang X, Long J, Zhu L, Au CT, Xu X. Cesium hydroxide-catalyzed isomerization of terminal alkynes for the synthesis of O-allenes and N-allenes. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.08.016] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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11
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Kriening S, Evagelou A, Claasen B, Baro A, Laschat S. Asymmetric Evanssyn-Aldol Reactions of Terpene-Derived Enals: Scope and Limitations. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402736] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Wang HY, Zhang W, Schienebeck CM, Bennett SR, Tang W. Intermolecular bromoesterification of conjugated enynes: an efficient synthesis of bromoallenes. Org Chem Front 2014. [DOI: 10.1039/c3qo00088e] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly functionalized bromoallenes were prepared by intermolecular 1,4-bromoesterification of conjugated enynes.
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Affiliation(s)
- Hao-Yuan Wang
- School of Pharmacy
- University of Wisconsin
- Madison, USA
| | - Wei Zhang
- School of Pharmacy
- University of Wisconsin
- Madison, USA
| | | | | | - Weiping Tang
- School of Pharmacy
- University of Wisconsin
- Madison, USA
- Department of Chemistry
- University of Wisconsin
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Heravi MM, Zadsirjan V. Oxazolidinones as chiral auxiliaries in asymmetric aldol reactions applied to total synthesis. ACTA ACUST UNITED AC 2013. [DOI: 10.1016/j.tetasy.2013.08.011] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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14
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Wang BG, Gloer JB, Ji NY, Zhao JC. Halogenated Organic Molecules of Rhodomelaceae Origin: Chemistry and Biology. Chem Rev 2013; 113:3632-85. [DOI: 10.1021/cr9002215] [Citation(s) in RCA: 168] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Bin-Gui Wang
- Key Laboratory of Experimental
Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, P. R. China
| | - James B. Gloer
- Department of Chemistry, University of Iowa, Iowa City, Iowa 52242, United States
| | - Nai-Yun Ji
- Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences,
Yantai 264003, P. R. China
| | - Jian-Chun Zhao
- Key Laboratory of Experimental
Marine Biology, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, P. R. China
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15
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Kim MJ, Sohn TI, Kim D, Paton RS. Concise Substrate-Controlled Asymmetric Total Syntheses of Dioxabicyclic Marine Natural Products with 2,10-Dioxabicyclo-[7.3.0]dodecene and 2,9-Dioxabicyclo[6.3.0]undecene Skeletons. J Am Chem Soc 2012. [DOI: 10.1021/ja310249u] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mi Jung Kim
- The Research Institute of Pharmaceutical
Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Te-ik Sohn
- The Research Institute of Pharmaceutical
Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Deukjoon Kim
- The Research Institute of Pharmaceutical
Sciences, College of Pharmacy, Seoul National University, Seoul 151-742, Korea
| | - Robert S. Paton
- Chemistry Research Laboratory,
Department of Chemistry, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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Bonney KJ, Braddock DC. A Unifying Stereochemical Analysis for the Formation of Halogenated C15-Acetogenin Medium-Ring Ethers From Laurencia Species via Intramolecular Bromonium Ion Assisted Epoxide Ring-Opening and Experimental Corroboration with a Model Epoxide. J Org Chem 2012; 77:9574-84. [DOI: 10.1021/jo301580c] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Karl J. Bonney
- Department of Chemistry, Imperial College London, London, SW7 2AZ, U. K
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Abstract
The total syntheses of (+)-vigulariol and (-)-sclerophytin A are reported in 15 steps and 16 steps, respectively, from a known compound. The flexible, readily scalable synthetic strategy allows for rapid construction of a critical tricyclic intermediate and is demonstrated via the synthesis of these two marine natural products. A key reaction in this synthetic protocol is a combination Wittig/intramolecular Diels-Alder cycloaddition.
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Affiliation(s)
- Michael T Crimmins
- Kenan Laboratory of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, USA.
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Hillier IH, Pandian S, Percy JM, Vincent MA. Mapping the potential energy surfaces for ring-closing metathesis reactions of prototypical dienes by electronic structure calculations. Dalton Trans 2011; 40:1061-72. [DOI: 10.1039/c0dt01314e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Abstract
The total synthesis of the originally proposed structure of briarellin J is reported in 15 steps from a known compound and in 23 steps from readily available materials. Key reactions include an exo-selective intramolecular Diels-Alder and a substrate-controlled hydroboration. Discrepancies in the spectroscopic data of the synthetic and natural material led to a revision of the assigned structure.
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Affiliation(s)
- Michael T Crimmins
- Kenan, Caudill, Venable, and Murray Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States.
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Ghosh S, Hossain MF, Malik CK, Maity S. Effect of ring fusion stereochemistry on double bond geometry. Unexpected formation of nine-membered cyclic ether with E-configurated double bond through RCM. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.09.084] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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21
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Jeong W, Kim MJ, Kim H, Kim S, Kim D, Shin KJ. Substrate-controlled asymmetric total synthesis and structure revision of (+)-itomanallene A. Angew Chem Int Ed Engl 2010; 49:752-6. [PMID: 20029867 DOI: 10.1002/anie.200905826] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wonjang Jeong
- The Research Institute of Pharmaceutical Sciences, College of Pharmacy, Seoul National University, San 56-1, Shinrim-Dong, Kwanak-Ku, Seoul 151-742, Korea
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22
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Jeong W, Kim M, Kim H, Kim S, Kim D, Shin K. Substrate-Controlled Asymmetric Total Synthesis and Structure Revision of (+)-Itomanallene A. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200905826] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Ravikumar PC, Yao L, Fleming FF. Allylic and allenic halide synthesis via NbCl(5)- and NbBr(5)-mediated alkoxide rearrangements. J Org Chem 2009; 74:7294-9. [PMID: 19739606 PMCID: PMC2754319 DOI: 10.1021/jo901287f] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Addition of NbCl(5) or NbBr(5) to a series of magnesium, lithium, or potassium allylic or propargylic alkoxides directly provides allylic or allenic halides. Halogenation formally occurs through a metalla-halo-[3,3] rearrangement, although concerted, ionic, and direct displacement mechanisms appear to operate competitively. Transposition of the olefin is equally effective for allylic alkoxides prepared by nucleophilic addition, deprotonation, or reduction. Experimentally, the niobium pentahalide halogenations are rapid, afford essentially pure (E)-allylic or -allenic halides after extraction, and are applicable to a range of aliphatic and aromatic alcohols, aldehydes, and ketones.
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Affiliation(s)
- P. C. Ravikumar
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530
| | - Lihua Yao
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530
| | - Fraser F. Fleming
- Department of Chemistry and Biochemistry, Duquesne University, Pittsburgh, PA 15282-1530
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Ortega N, Martín T, Martín VS. Synthesis of α,α′-Disubstituted Linear Ethers by an Intermolecular Nicholas Reaction - Application to the Synthesis of (+)-cis/(-)-trans-Lauthisan and (+)-cis/(+)-trans-Obtusan. European J Org Chem 2009. [DOI: 10.1002/ejoc.200801063] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Becker J, Bergander K, Fröhlich R, Hoppe D. Asymmetric Total Synthesis and X-Ray Crystal Structure of the Cytotoxic Marine Diterpene (+)-Vigulariol. Angew Chem Int Ed Engl 2008; 47:1654-7. [DOI: 10.1002/anie.200704678] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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27
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Becker J, Bergander K, Fröhlich R, Hoppe D. Asymmetrische Totalsynthese und Festkörperstruktur des marinen cytotoxischen Diterpens (+)-Vigulariol. Angew Chem Int Ed Engl 2008. [DOI: 10.1002/ange.200704678] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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28
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Deb I, John S, Namboothiri IN. Synthesis of benzo-fused medium ring cyclic ethers via a Michael addition–ring closing metathesis strategy involving nitroaliphatic compounds. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.09.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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29
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Crimmins MT, Ellis JM. An Intramolecular Diels−Alder Strategy for the Asbestinins: Enantioselective Total Syntheses of 11-Acetoxy-4-deoxyasbestinin D and Asbestinin-12. J Org Chem 2007; 73:1649-60. [DOI: 10.1021/jo0712695] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Michael T. Crimmins
- Department of Chemistry, Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
| | - J. Michael Ellis
- Department of Chemistry, Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290
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30
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Synthesis of 3-oxooxa- and 3-oxoazacycloalk-4-enes by ring-closing metathesis. Application to the synthesis of an inhibitor of cathepsin K. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.03.066] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chattopadhyay SK, Karmakar S, Biswas T, Majumdar K, Rahaman H, Roy B. Formation of medium-ring heterocycles by diene and enyne metathesis. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.01.063] [Citation(s) in RCA: 120] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Crimmins MT, Zuccarello JL, Cleary PA, Parrish JD. Convergent, stereoselective synthesis of the GHIJ fragment of brevetoxin A. Org Lett 2006; 8:159-62. [PMID: 16381592 DOI: 10.1021/ol0526625] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] A stereoselective synthesis of the GHIJ fragment of brevetoxin A utilizing a convergent assembly strategy is described. Glycolate alkylation, ring-closing metathesis, and Hosomi-Sakurai reactions were central operations in the construction of the G ring and J ring subunits, which were united through a Horner-Wadsworth-Emmons coupling. Subsequent dehydrative cyclization produced an endocyclic enol ether that was further elaborated to the tetracyclic GHIJ fragment of brevetoxin A.
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Affiliation(s)
- Michael T Crimmins
- Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, 27599, USA.
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Jeon SJ, Chen YK, Walsh PJ. Catalytic asymmetric synthesis of hydroxy enol ethers: approach to a two-carbon homologation of aldehydes. Org Lett 2006; 7:1729-32. [PMID: 15844892 DOI: 10.1021/ol050255n] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
[reaction: see text] Hydroboration of ethoxy acetylene, transmetalation to zinc, and addition to aldehydes in the presence of a chiral amino alcohol ligand (MIB) affords hydroxy enol ethers with high ee. The resultant enantiomerically enriched hydroxy enol ethers were converted to protected hydroxy aldehydes, a useful synthetic building block for the construction of a variety of polyoxygenated natural products. In addition, diastereoselective formation of syn- and anti-1,3-diols was studied.
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Affiliation(s)
- Sang-Jin Jeon
- Department of Chemistry, P. Roy and Diana T. Vagelos Laboratories, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
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35
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Crimmins MT, Brown BH, Plake HR. An Intramolecular Diels−Alder Approach to the Eunicellins: Enantioselective Total Syntheses of Ophirin B and Astrogorgin. J Am Chem Soc 2006; 128:1371-8. [PMID: 16433557 DOI: 10.1021/ja056334b] [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: 11/29/2022]
Abstract
The enantioselective syntheses of the eunicellins ophirin B and astrogorgin have been completed. Ring-closing metatheses provide efficient access to the oxonene rings, and highly diastereoselective intramolecular Diels-Alder reactions resulted in the formation of the hydrobenzofuran portion of the molecules.
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Affiliation(s)
- Michael T Crimmins
- Department of Chemistry, University of North Carolina at Chapel Hill, 27599-3290, USA.
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Crimmins MT, Ellis JM. Establishing the absolute configuration of the asbestinins: enantioselective total synthesis of 11-acetoxy-4-deoxyasbestinin D. J Am Chem Soc 2005; 127:17200-1. [PMID: 16332064 PMCID: PMC2546569 DOI: 10.1021/ja056921x] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A highly stereoselective synthesis of 11-acetoxy-4-deoxyasbestinin D (1) has been completed in 26 linear steps. The synthesis hinges on a selective glycolate aldol addition to establish the C-2 stereocenter, a ring-closing metathesis reaction to complete the oxonene, and an intramolecular Diels-Alder cycloaddition to establish the relative configuration at C-1, C-10, and C-14. This initial total synthesis of an asbestinin also serves to confirm the absolute configuration of this subclass of the C-2-C-11-cyclized cembranoid natural products.
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Affiliation(s)
- Michael T Crimmins
- Department of Chemistry, Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, USA.
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Crimmins MT, McDougall PJ, Emmitte KA. A Convergent Coupling Strategy for the Formation of Polycyclic Ethers: Stereoselective Synthesis of the BCDE Fragment of Brevetoxin A. Org Lett 2005; 7:4033-6. [PMID: 16119960 DOI: 10.1021/ol051543m] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A stereoselective synthesis of the BCDE fragment of brevetoxin A has been completed. anti-Glycolate aldol, glycolate alkylation, and ring-closing metathesis reactions were employed as key bond-forming events. A convergent assembly strategy was employed that relied on a Horner-Wadsworth-Emmons union of two complex fragments. Subsequent cyclization and dehydration led to efficient generation of an intermediate endocyclic enol ether, which was advanced to a tetracyclic fragment. [reaction: see text]
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Affiliation(s)
- Michael T Crimmins
- Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
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Efficient metathesis route to the B-ring of eleutherobin and other medium-sized cyclic ethers. Tetrahedron 2005. [DOI: 10.1016/j.tet.2005.05.045] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Enders D, Lenzen A, Raabe G. Asymmetric Synthesis of the 1-epi Aglycon of the Cripowellins A and B. Angew Chem Int Ed Engl 2005; 44:3766-9. [PMID: 15892131 DOI: 10.1002/anie.200500556] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dieter Enders
- Institut für Organische Chemie, RWTH Aachen, Landoltweg 1, 52074 Aachen, Germany.
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Enders D, Lenzen A, Raabe G. Asymmetrische Synthese des Grundgerüsts der Cripowelline A und B - das 1-epi-Aglycon. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500556] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Crimmins MT, Brown BH. An Intramolecular Diels−Alder Approach to the Eunicelins: Enantioselective Total Synthesis of Ophirin B. J Am Chem Soc 2004; 126:10264-6. [PMID: 15315437 DOI: 10.1021/ja046574b] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The enantioselective synthesis of the eunicellin ophirin B has been completed. A ring-closing metathesis provides efficient access to the oxonene ring, and a highly diastereoselective intramolecular Diels-Alder reaction results in the formation of the hydrobenzofuran portion of the molecule.
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Affiliation(s)
- Michael T Crimmins
- Department of Chemistry, Venable and Kenan Laboratories of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599-3290, USA
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Clive DL, Cheng H, Gangopadhyay P, Huang X, Prabhudas B. [2.2.1]-Bicyclic systems relevant to synthetic studies on CP-225,917—use of a new silylated cyclopentadiene. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.03.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Nakamura I, Yamamoto Y. Transition-Metal-Catalyzed Reactions in Heterocyclic Synthesis. Chem Rev 2004; 104:2127-98. [PMID: 15137788 DOI: 10.1021/cr020095i] [Citation(s) in RCA: 1302] [Impact Index Per Article: 65.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Itaru Nakamura
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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Deiters A, Martin SF. Synthesis of Oxygen- and Nitrogen-Containing Heterocycles by Ring-Closing Metathesis. Chem Rev 2004; 104:2199-238. [PMID: 15137789 DOI: 10.1021/cr0200872] [Citation(s) in RCA: 1121] [Impact Index Per Article: 56.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexander Deiters
- Department of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, USA.
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T. Crimmins M, J. Diaz C, A. Emmitte K. A Unified Approach to the Enantioselective Synthesis of 2,6-cis and trans Disubstituted Tetrahydropyranones. HETEROCYCLES 2004. [DOI: 10.3987/com-03-s(p)33] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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50
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The chemistry of the carbon–transition metal double and triple bond: annual survey covering the year 2002. Coord Chem Rev 2004. [DOI: 10.1016/j.cct.2003.11.001] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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