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Labyad SA, Mekkaoui AA, Laayati M, Orfi H, El Firdoussi L, El Houssame S. Selective catalytic synthesis of new terpenic chlorides using NaDCC as an eco-friendly and highly stable FAC agent. RSC Adv 2023; 13:30548-30561. [PMID: 37860172 PMCID: PMC10582686 DOI: 10.1039/d3ra05792e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Accepted: 10/09/2023] [Indexed: 10/21/2023] Open
Abstract
A simple, mild and efficient scope pathway for a selective catalytic chlorination of terpenic olefins is investigated in the presence of a highly efficient chlorination agent and a readily available Lewis acid catalyst. The sodium dichloroisocyanurate (NaDCC) used in the present work as an easy handling, sustainable and cost-effective chlorine donor due to its high free available chlorine (FAC), exhibits a high efficiency for selective catalytic chlorination. Herein, we report for the first-time the FeCl2/NaDCC combination system for the selective catalytic chlorination towards new functionalized terpenic olefins. In order to examine the general features of this catalytic reaction, the effects of pH, solvent, dilution, chlorination agent nature, stoichiometry and reaction kinetics are optimized using carvone as a model substrate. Among the studied parameters, catalyst stoichiometry was found to be determinant for highly controllable chlorination selectivity towards new allylic and vinylic chlorides. Indeed, the oxidation state, ligand and metal effects of the catalyst are examined using various Lewis acids, where the chlorinated ones (MClx), such as FeCl2, FeCl3 and SnCl2, exhibit a comprehensive approach for a controllable chlorination reaction. In addition, the homogeneous catalytic system shows good reusability with significant catalytic conversion depending on the FAC content in the reaction medium. The reaction proceeds under mild conditions with shorter reaction time and high selectivity towards new high added value allylic and vinylic chlorinated derivatives of naturally occurring terpenic olefins in good to excellent yields.
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Affiliation(s)
- Salim Adam Labyad
- Laboratoire des Sciences des Matériaux, Mathématiques et Environnement, Université Sultan Moulay Slimane, Faculté Polydisciplinaire de Khouribga Khouribga 25000 BP 145 Morocco
| | - Ayoub Abdelkader Mekkaoui
- Laboratoire de Chimie Moléculaire, Equipe de Chimie de Coordination et de Catalyse, Département de Chimie, Faculté des Sciences Semlalia Marrakech 40001 BP 2390 Morocco
| | - Mouhsine Laayati
- Laboratoire des Sciences des Matériaux, Mathématiques et Environnement, Université Sultan Moulay Slimane, Faculté Polydisciplinaire de Khouribga Khouribga 25000 BP 145 Morocco
- Laboratoire de Chimie Moléculaire, Equipe de Chimie de Coordination et de Catalyse, Département de Chimie, Faculté des Sciences Semlalia Marrakech 40001 BP 2390 Morocco
| | - Hamza Orfi
- Laboratoire des Sciences des Matériaux, Mathématiques et Environnement, Université Sultan Moulay Slimane, Faculté Polydisciplinaire de Khouribga Khouribga 25000 BP 145 Morocco
| | - Larbi El Firdoussi
- Laboratoire de Chimie Moléculaire, Equipe de Chimie de Coordination et de Catalyse, Département de Chimie, Faculté des Sciences Semlalia Marrakech 40001 BP 2390 Morocco
| | - Soufiane El Houssame
- Laboratoire des Sciences des Matériaux, Mathématiques et Environnement, Université Sultan Moulay Slimane, Faculté Polydisciplinaire de Khouribga Khouribga 25000 BP 145 Morocco
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Jin J, Zhao Y, Kyne SH, Farshadfar K, Ariafard A, Chan PWH. Copper(I)-catalysed site-selective C(sp 3)-H bond chlorination of ketones, (E)-enones and alkylbenzenes by dichloramine-T. Nat Commun 2021; 12:4065. [PMID: 34210971 PMCID: PMC8249392 DOI: 10.1038/s41467-021-23988-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2020] [Accepted: 05/20/2021] [Indexed: 12/12/2022] Open
Abstract
Strategies that enable intermolecular site-selective C-H bond functionalisation of organic molecules provide one of the cornerstones of modern chemical synthesis. In chloroalkane synthesis, such methods for intermolecular site-selective aliphatic C-H bond chlorination have, however, remained conspicuously rare. Here, we present a copper(I)-catalysed synthetic method for the efficient site-selective C(sp3)-H bond chlorination of ketones, (E)-enones and alkylbenzenes by dichloramine-T at room temperature. A key feature of the broad substrate scope is tolerance to unsaturation, which would normally pose an immense challenge in chemoselective aliphatic C-H bond functionalisation. By unlocking dichloramine-T's potential as a chlorine radical atom source, the product site-selectivities achieved are among the most selective in alkane functionalisation and should find widespread utility in chemical synthesis. This is exemplified by the late-stage site-selective modification of a number of natural products and bioactive compounds, and gram-scale preparation and formal synthesis of two drug molecules.
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Affiliation(s)
- Jianwen Jin
- School of Chemistry, Monash University, Clayton, Victoria, Australia
| | - Yichao Zhao
- School of Chemistry, Monash University, Clayton, Victoria, Australia
| | - Sara Helen Kyne
- School of Chemistry, Monash University, Clayton, Victoria, Australia
| | - Kaveh Farshadfar
- Department of Chemistry, Islamic Azad University, Poonak, Tehran, Iran
| | - Alireza Ariafard
- Department of Chemistry, Islamic Azad University, Poonak, Tehran, Iran.
- School of Natural Sciences-Chemistry, University of Tasmania, Hobart, Tasmania, Australia.
| | - Philip Wai Hong Chan
- School of Chemistry, Monash University, Clayton, Victoria, Australia.
- Department of Chemistry, University of Warwick, Coventry, UK.
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3
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Catalytic Allylic Chlorination of Natural Terpenic Olefins Using Supported and Nonsupported Lewis Acid Catalysts. J CHEM-NY 2020. [DOI: 10.1155/2020/2563634] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
A mild and convenient method for the allylic chlorination of naturally occurring terpenic olefins was investigated in the presence of different supported and non-supported Lewis acid catalysts. The reaction has been tested on carvone as a model substrate in the presence of sodium hypochlorite as chlorine donor. The scope and limitations of transition metal-based Lewis acid catalysts, stoichiometry, and substrate structure were evaluated. Among the iron precursors used, FeCl3 and FeCl2 provide the promise of a general approach to allylic or vinylic chlorination reaction. Various terpenic olefins were examined in the presence of FeCl3/NaOCl combination system. The catalytic chlorination proceeds under mild conditions with short reaction time and shows a high selectivity affording the corresponding chlorides in good to excellent yields.
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4
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Demertzidou VP, Pappa S, Sarli V, Zografos AL. Regioselective Ene-Type Allylic Chlorination of Electron-Rich Alkenes by Activated DMSO. J Org Chem 2017; 82:8710-8715. [PMID: 28753300 DOI: 10.1021/acs.joc.7b01103] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
A simple protocol involving the activation of DMSO by chlorotrimethysilane is described for the chemoselective chlorination of polyprenoids. The proposed protocol provides a versatile and scalable alternative to existing routes for accessing useful synthetic synthons for the synthesis of complex terpenoids.
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Affiliation(s)
- Vera P Demertzidou
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| | - Stavroula Pappa
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| | - Vasiliki Sarli
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
| | - Alexandros L Zografos
- Laboratory of Organic Chemistry, Department of Chemistry, Aristotle University of Thessaloniki , Main University Campus, 54124 Thessaloniki, Greece
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5
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Saikia I, Borah AJ, Phukan P. Use of Bromine and Bromo-Organic Compounds in Organic Synthesis. Chem Rev 2016; 116:6837-7042. [PMID: 27199233 DOI: 10.1021/acs.chemrev.5b00400] [Citation(s) in RCA: 287] [Impact Index Per Article: 35.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Bromination is one of the most important transformations in organic synthesis and can be carried out using bromine and many other bromo compounds. Use of molecular bromine in organic synthesis is well-known. However, due to the hazardous nature of bromine, enormous growth has been witnessed in the past several decades for the development of solid bromine carriers. This review outlines the use of bromine and different bromo-organic compounds in organic synthesis. The applications of bromine, a total of 107 bromo-organic compounds, 11 other brominating agents, and a few natural bromine sources were incorporated. The scope of these reagents for various organic transformations such as bromination, cohalogenation, oxidation, cyclization, ring-opening reactions, substitution, rearrangement, hydrolysis, catalysis, etc. has been described briefly to highlight important aspects of the bromo-organic compounds in organic synthesis.
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Affiliation(s)
| | - Arun Jyoti Borah
- Department of Chemistry, Gauahti University , Guwahati-781014, Assam, India
| | - Prodeep Phukan
- Department of Chemistry, Gauahti University , Guwahati-781014, Assam, India
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Pratsch G, Overman LE. Synthesis of 2,5-Diaryl-1,5-dienes from Allylic Bromides Using Visible-Light Photoredox Catalysis. J Org Chem 2015; 80:11388-97. [PMID: 26514061 PMCID: PMC4697828 DOI: 10.1021/acs.joc.5b01962] [Citation(s) in RCA: 16] [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
Visible-light photoreductive coupling of 2-arylallyl bromides in the presence of the photocatalyst Ru(bpy)3(PF6)2, a Hantzsch ester, and i-Pr2NEt gives 2,5-diaryl-1,5-dienes in high yield. This method avoids the use of stoichiometric metal reductants and is compatible with the presence of halogen, alkyl, electron-donating, and electron-withdrawing substituents on the aromatic ring.
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Affiliation(s)
- Gerald Pratsch
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
| | - Larry E. Overman
- Department of Chemistry, 1102 Natural Sciences II, University of California, Irvine, California 92697-2025
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7
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Zheng Y, Mao J, Rong G, Xu X. A NCS mediated oxidative C-H bond functionalization: direct esterification between a C(sp(3))-H bond and carboxylic acids. Chem Commun (Camb) 2015; 51:8837-40. [PMID: 25921733 DOI: 10.1039/c5cc02424b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A transition metal free oxidative C-H bond functionalization/esterification of α-alkoxy alkanes with acids is described in this report. This method is effectively mediated by NCS instead of traditional oxidants, like TBHP or its derivatives, and directly generates the esterification products in moderate to high yield under mild conditions. This tranformation constitutes a practical and general approach toward various α-acyloxy ethers with broad substrate generality; alkyl-, aryl-, alkenyl- and alkynyl-carboxylic acids are all well tolerated.
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Affiliation(s)
- Yang Zheng
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.
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8
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Huleatt PB, Khoo ML, Chua YY, Tan TW, Liew RS, Balogh B, Deme R, Gölöncsér F, Magyar K, Sheela DP, Ho HK, Sperlágh B, Mátyus P, Chai CLL. Novel Arylalkenylpropargylamines as Neuroprotective, Potent, and Selective Monoamine Oxidase B Inhibitors for the Treatment of Parkinson’s Disease. J Med Chem 2015; 58:1400-19. [DOI: 10.1021/jm501722s] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Paul B. Huleatt
- Institute of Chemical and Engineering Sciences, A* STAR (Agency of Science, Technology and Research), 8 Biomedical Grove, Neuros #07-01, Singapore 138665, Singapore
| | - Mui Ling Khoo
- Institute of Chemical and Engineering Sciences, A* STAR (Agency of Science, Technology and Research), 8 Biomedical Grove, Neuros #07-01, Singapore 138665, Singapore
| | - Yi Yuan Chua
- Institute of Chemical and Engineering Sciences, A* STAR (Agency of Science, Technology and Research), 8 Biomedical Grove, Neuros #07-01, Singapore 138665, Singapore
| | - Tiong Wei Tan
- Institute of Chemical and Engineering Sciences, A* STAR (Agency of Science, Technology and Research), 8 Biomedical Grove, Neuros #07-01, Singapore 138665, Singapore
| | - Rou Shen Liew
- Institute of Chemical and Engineering Sciences, A* STAR (Agency of Science, Technology and Research), 8 Biomedical Grove, Neuros #07-01, Singapore 138665, Singapore
| | - Balázs Balogh
- Department
of Organic Chemistry, Semmelweis University, Hőgyes Endre utca 7, H-1092, Budapest, Hungary
| | - Ruth Deme
- Department
of Organic Chemistry, Semmelweis University, Hőgyes Endre utca 7, H-1092, Budapest, Hungary
| | - Flóra Gölöncsér
- Department
of Pharmacology, Institute of Experimental Medicine, Hungarian Academy of Sciences, H 1083, Budapest, Hungary
| | - Kalman Magyar
- Department
of Pharmacodynamics, Semmelweis University, Nagyvárad tér 4, H-1089, Budapest, Hungary
| | - David P. Sheela
- Department
of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Han Kiat Ho
- Department
of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
| | - Beáta Sperlágh
- Department
of Pharmacology, Institute of Experimental Medicine, Hungarian Academy of Sciences, H 1083, Budapest, Hungary
| | - Péter Mátyus
- Department
of Organic Chemistry, Semmelweis University, Hőgyes Endre utca 7, H-1092, Budapest, Hungary
| | - Christina L. L. Chai
- Institute of Chemical and Engineering Sciences, A* STAR (Agency of Science, Technology and Research), 8 Biomedical Grove, Neuros #07-01, Singapore 138665, Singapore
- Department
of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore 117543, Singapore
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9
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Rong M, Li D, Huang R, Huang Y, Han X, Weng Z. Synthesis of Allylic and Propargylic Trifluoromethyl Thioethers by Copper(I)-Catalyzed Trifluoromethylthiolation of Allylic Bromides and Propargylic Chlorides. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402480] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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10
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Chittiboyina AG, Peddikotla P, Avery MA, Khan IA. Directed hydrogenation of acyclic homoallylic alcohols: enantioselective syntheses of (+)- and (-)-laurenditerpenol. J Org Chem 2013; 78:9223-32. [PMID: 23985032 DOI: 10.1021/jo401461x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Laurenditerpenol is the first marine natural product shown to inhibit hypoxia-inducible factor 1 (HIF-1) activation. Preclinical studies support that the inhibition of HIF-1 is one of the molecular targets for antitumor drug discovery. The synthetically challenging molecular architecture of laurenditerpenol, its absolute stereostructure, and the biological activity of several diastereoisomers were accomplished by our group in 2007 by diastereoselective synthesis. Herein, we report enantioselective syntheses of both enantiomers of laurenditerpenol involving sequential Michael addition and remote homoallylic hydroxyl group-directed asymmetric hydrogenation at ambient temperature and pressure as key reaction steps. The current approach is elegant and overall more efficient than the ones previously reported in the literature.
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Affiliation(s)
- Amar G Chittiboyina
- National Center for Natural Products Research, ‡Department of Medicinal Chemistry, and §Department of Pharmacognosy, School of Pharmacy, University of Mississippi , University, Mississippi 38677, United States
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11
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Liang T, Neumann CN, Ritter T. Introduction of fluorine and fluorine-containing functional groups. Angew Chem Int Ed Engl 2013; 52:8214-64. [PMID: 23873766 DOI: 10.1002/anie.201206566] [Citation(s) in RCA: 1965] [Impact Index Per Article: 178.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2012] [Indexed: 01/20/2023]
Abstract
Over the past decade, the most significant, conceptual advances in the field of fluorination were enabled most prominently by organo- and transition-metal catalysis. The most challenging transformation remains the formation of the parent C-F bond, primarily as a consequence of the high hydration energy of fluoride, strong metal-fluorine bonds, and highly polarized bonds to fluorine. Most fluorination reactions still lack generality, predictability, and cost-efficiency. Despite all current limitations, modern fluorination methods have made fluorinated molecules more readily available than ever before and have begun to have an impact on research areas that do not require large amounts of material, such as drug discovery and positron emission tomography. This Review gives a brief summary of conventional fluorination reactions, including those reactions that introduce fluorinated functional groups, and focuses on modern developments in the field.
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Affiliation(s)
- Theresa Liang
- Department of Chemistry and Chemical Biology, Harvard University, 12 Oxford Street, Cambridge, MA 02138, USA
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12
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13
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Yemets SV, Shubina TE, Krasutsky PA. Electrophilic monoiodination of terminal alkenes. Org Biomol Chem 2013; 11:2891-7. [DOI: 10.1039/c3ob27348b] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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14
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Fix-Stenzel SR, Hayes ME, Zhang X, Wallace GA, Grongsaard P, Schaffter LM, Hannick SM, Franczyk TS, Stoffel RH, Cusack KP. A stereoselective and scalable synthesis of a conformationally constrained S1P1 agonist. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.04.099] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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15
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Luo HQ, Loh TP. Synthesis of aryl allylic fluorides by direct electrophilic fluorination of alkenes. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.01.052] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Affiliation(s)
- Konrad Tiefenbacher
- Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, 1090 Vienna, Austria
| | - Johann Mulzer
- Institute of Organic Chemistry, University of Vienna, Währingerstrasse 38, 1090 Vienna, Austria
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17
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Viso A, Fernández de la Pradilla R, Flores A, del Águila M. Highly diastereoselective Barbier allylation and iminium cyclization: a simple entry to bicyclic and tricyclic piperazinones. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.10.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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18
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Pacheco MC, Purser S, Gouverneur V. The chemistry of propargylic and allylic fluorides. Chem Rev 2008; 108:1943-81. [PMID: 18543877 DOI: 10.1021/cr068410e] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- M Carmen Pacheco
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, OX1 3TA Oxford, UK
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19
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Chittiboyina AG, Kumar GM, Carvalho PB, Liu Y, Zhou YD, Nagle DG, Avery MA. Total synthesis and absolute configuration of laurenditerpenol: a hypoxia inducible factor-1 activation inhibitor. J Med Chem 2007; 50:6299-302. [PMID: 18004798 DOI: 10.1021/jm7011062] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The absolute stereo structure of the natural product laurenditerpenol (1S, 6R, 7S, 10R, 11R, 14S, 15R) has been accomplished from eight plausible stereoisomers by its first asymmetric total synthesis in a highly convergent and flexible synthetic pathway. Six stereoisomers of laurenditerpenol were synthesized and evaluated for their biological activity.
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Abstract
Ene-chlorination of olefins by N-chlorosuccinimide is catalyzed by phenylselenenyl chloride. This reaction demonstrates the catalytic conversion of C-H bonds into more reactive C-Cl bonds. [reaction: see text]
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Affiliation(s)
- Jon A Tunge
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS 66045-7582, USA.
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21
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Bettadaiah BK, Srinivas P. An Expedient Synthesis of Allylic/Secondary Bromides from Dehydration of Tertiary-β-bromo Alcohols. SYNTHETIC COMMUN 2003. [DOI: 10.1081/scc-120024749] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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22
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Yamanaka M, Nishida A, Nakagawa M. Imino ene reaction catalyzed by ytterbium(III) triflate and TMSCl or TMSOTf. J Org Chem 2003; 68:3112-20. [PMID: 12688780 DOI: 10.1021/jo0268153] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel combined system of Yb(OTf)(3) with TMSCl or TMSOTf catalyzed an imino ene reaction. The reaction of N-tosylbenzaldimine (1) with alpha-methylstyrene (2) proceeded smoothly to give homoallylic amine 3 in the presence of a catalytic amount of Yb(OTf)(3) and TMSCl. This catalytic system was successfully applied to the imino ene reactions of various aldimines with alkenes. This new imino ene reaction provides a unique method for the three-component coupling reaction of an aldehyde, tosylamide, and alpha-methylstyrene in the presence of Yb(OTf)(3) and TMSOTf, to give the corresponding homoallylic amine.
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Affiliation(s)
- Masamichi Yamanaka
- Graduate School of Pharmaceutical Sciences, Chiba University, Yayoi-cho 1-33, Inage-ku, Chiba 263-8522, Japan
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Nakagawa M. [Synthetic study of biologically important nitrogen containing natural products: development of new methodology and design of leading compounds for new pharmaceuticals]. YAKUGAKU ZASSHI 2003; 123:225-48. [PMID: 12704863 DOI: 10.1248/yakushi.123.225] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Synthetic study of biologically important nitrogen-containing natural products and development of new methodologies and design of leading compounds for new pharmaceuticals are described. The first total synthesis of eudistomines, manzamine C, martefragin A, cerebroside B1b, and symbioramide was accomplished and the absolute configurations of the stereogenic centers were determined. A novel methodology useful for the synthesis of alkaloids that have perhydroisoquinoline ring system such as manzamine A and B, and related alkaloids, nakadomarin A and dynemicin A, is presented. Sphingolipids, 4-stereoisomers of 1-phenyl-2-palmitoylamino-3-morpholino-1-propanol, were synthesized and antimalaria activity was investigated. Inhibition of DNA primase by sphingosine and its analogues is described. A new synthetic methodology for alkylation and reduction of imines has been developed, and the first example of a reagent-controlled enantioselective Pictet-Spengler reaction is described. Also novel and convenient methods using transition metal and rare earth metals including alkene metathesis, asymmetric Diels-Alder reaction, imino ene reaction, selective allylic halogenation, enantioselective Pictet-Spengler reaction, and enantioselective physostigmine synthesis are described.
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Affiliation(s)
- Masako Nakagawa
- Faculty of Pharmaceutical Sciences, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba City 263-8522, Japan.
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