1
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Xu ZJ, Liu XY, Zhu MZ, Xu YL, Yu Y, Xu HR, Cheng AX, Lou HX. Photoredox-Catalyzed Cascade Reactions Involving Aryl Radical: Total Synthesis of (±)-Norascyronone A and (±)-Eudesmol. Org Lett 2021; 23:9073-9077. [PMID: 34797080 DOI: 10.1021/acs.orglett.1c03319] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Herein, we have developed two types of photoredox-catalyzed cascade reactions using diaryliodonium salts for the concise synthesis of norascyronone A and β-eudesmol. A rationally designed photoredox-catalyzed arylation/cyclization/Friedel-Crafts cascade reaction of enone was exploited to generate the norascyronone polycyclic skeleton. A visible-light-induced radical cyclization/acyloxy-migration reaction was explored to forge the decalin skeleton of eudesmol, and mechanistic studies indicated the reaction was initiated by one-electron oxidation of the enol ester.
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Affiliation(s)
- Ze-Jun Xu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China.,State Key Laboratory of Bioorganic and Natural Products Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Jinan 2000325, China
| | - Xu-Yuan Liu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Ming-Zhu Zhu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Yu-Liang Xu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Yue Yu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Hai-Ruo Xu
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Ai-Xia Cheng
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
| | - Hong-Xiang Lou
- Department of Natural Products Chemistry, Key Lab of Chemical Biology, School of Pharmaceutical Sciences, Shandong University, Jinan 250012, China
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2
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Pyrrolidine‐Catalyzed Annulations of Quinone Monoacetals with Naphthols: Synthesis of 2‐Oxabicyclo[3.3.1]nonane Skeletons, Transformations and Reaction Mechanism. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101166] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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3
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Zhao Y, Zhu Y, Ma G, Wei Q, Yang S, Zeng X, Zhang H, Chen J. Short, enantioselective, gram-scale synthesis of (-)-zephyranthine. Chem Sci 2021; 12:9452-9457. [PMID: 34349919 PMCID: PMC8278928 DOI: 10.1039/d1sc03147c] [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: 06/10/2021] [Accepted: 06/11/2021] [Indexed: 11/21/2022] Open
Abstract
A reasonable synthesis design by strategically integrating functional group manipulation into the ring system construction resulted in a short, enantioselective, gram-scale total synthesis of (−)-zephyranthine. The concise route includes a catalytic Michael/Michael cascade for the asymmetric synthesis of a penta-substituted cyclohexane with three contiguous stereogenic centers, a remarkable 8-step one-pot operation to easily assemble the zephyranthine tetracyclic skeleton, the regioselective construction of a double bond in the C ring and an asymmetric dihydroxylation. This synthesis is also flexible and paves a potential path to a variety of cyclohexylamine-fused tricyclic or polycyclic alkaloids. A reasonable synthesis design by strategically integrating functional group manipulation into the ring system construction resulted in a short, enantioselective, gram-scale total synthesis of (−)-zephyranthine.![]()
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Affiliation(s)
- Yuxiang Zhao
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Yanren Zhu
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Guolan Ma
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Qi Wei
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Shaoxiong Yang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Xiaoyu Zeng
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Hongbin Zhang
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
| | - Jingbo Chen
- Key Laboratory of Medicinal Chemistry for Natural Resource, Ministry of Education, Yunnan Provincial Center for Research & Development of Natural Products, School of Chemical Science and Technology, Yunnan University Kunming 650091 P. R. China
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4
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Wang X, Li G, Li X, Zhu D, Shen R. One-pot three-component reaction of p-quinone monoacetals, l-proline and naphthols to afford N-aryl-2-arylpyrrolidines. Org Chem Front 2021. [DOI: 10.1039/d0qo01294g] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A one-pot three-component reaction of p-quinone monoacetals (or p-quinol ethers), l-proline and naphthols is developed for the synthesis of N-aryl-2-arylpyrrolidines under mild conditions with high chemo- and regioselectivity.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Gang Li
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Xiaojie Li
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Dunru Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
| | - Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering
- College of Chemistry and Chemical Engineering
- Nanjing Tech University
- Nanjing 210009
- China
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5
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Wang X, Zhang C, Shen R, Han LB. Three-Component Reactions of α-Amino Acids, p-Quinone Monoacetals, and Diarylphosphine Oxides to Selectively Afford 3-(Diarylphosphinyl)anilides and N-Aryl-2-diarylphosphinylpyrrolidines. J Org Chem 2020; 85:14753-14762. [PMID: 32223168 DOI: 10.1021/acs.joc.9b03426] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The three-component reactions of α-amino acids, p-quinone monoacetals (or p-quinol ethers), and diarylphosphine oxides have been developed for the synthesis of 3-(diarylphosphinyl) anilides and N-aryl-2-diarylphosphinylpyrrolidines. The transformations may involve the in situ generation of conjugated azomethine ylides or 2-azaallyl anion species from the reaction of α-amino acids and p-quinone monoacetals, which are further trapped by diarylphosphine oxides.
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Affiliation(s)
- Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Can Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical Engineering, Nanjing Tech University, Nanjing 211816, China
| | - Li-Biao Han
- National Institute of Advanced Industrial Science & Technology (AIST), Tsukuba, Ibaraki 305-8565, Japan
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6
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Shen R, Wang X, Zhang S, Dong C, Zhu D, Han L. Three‐Component Reaction of
p
‐Quinone Monoacetals, Amines and Diarylphosphine Oxides to Afford
m‐
(Phosphinyl)anilides. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201901421] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Ruwei Shen
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Xin Wang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Shunlin Zhang
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Chao Dong
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Dunru Zhu
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Chemical EngineeringNanjing Tech University Nanjing 211800 People's Republic of China
| | - Li‐Biao Han
- National Institute of Advanced Industrial Science & Technology (AIST), Tsukuba Ibaraki 305-8565 Japan
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7
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Kreibich M, Petrović D, Brückner R. Mechanistic Studies of the Deslongchamps Annulation. J Org Chem 2018; 83:1116-1133. [PMID: 29131961 DOI: 10.1021/acs.joc.7b02341] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The Cs2CO3-mediated annulations ("Deslongchamps annulations") of three spirocyclic benzoquinone monoketals 5b-d with an ester or acyl substituent at C-2 to two tert-butyl esters of γ,δ-unsaturated β-ketocarboxyl acids ("Nazarov reagents"; 2a,b) were monitored 1H NMR spectroscopically. This revealed that a primary product, by all likelihood the Michael adduct, forms fast and prior to the appearance of the Deslongchamps adduct. These primary products form reversibly. This was proved by two crossover and four scavenging experiments. Therein, components already incorporated in one of the mentioned primary products ended up in Deslongchamps adducts different from the one, which would have resulted if the respective primary product had reacted alone. However, these experiments leave open whether our primary products are intermediates en route to Deslongchamps products or whether they represent dead ends.
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Affiliation(s)
- Michael Kreibich
- Institut für Organische Chemie, Albert-Ludwigs-Universität , Albertstraße 21, D-79104 Freiburg im Breisgau, Germany
| | - Denis Petrović
- Institut für Organische Chemie, Albert-Ludwigs-Universität , Albertstraße 21, D-79104 Freiburg im Breisgau, Germany.,Noramco GmbH , Badische Bahnhofstrasse 16, CH-8212 Neuhausen, Switzerland
| | - Reinhard Brückner
- Institut für Organische Chemie, Albert-Ludwigs-Universität , Albertstraße 21, D-79104 Freiburg im Breisgau, Germany
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8
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Berkes B, Ozsváth K, Molnár L, Gáti T, Holczbauer T, Kardos G, Soós T. Expedient and Diastereodivergent Assembly of Terpenoid Decalin Subunits having Quaternary Stereocenters through Organocatalytic Robinson Annulation of Nazarov Reagent. Chemistry 2016; 22:18101-18106. [DOI: 10.1002/chem.201604541] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Indexed: 12/18/2022]
Affiliation(s)
- Barbara Berkes
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Kristóf Ozsváth
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Laura Molnár
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Tamás Gáti
- Servier Research Institute of Medicinal Chemistry; Záhony Street 7 1031 Budapest Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - György Kardos
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
| | - Tibor Soós
- Institute of Organic Chemistry; Hungarian Academy of Sciences; 1519 Budapest, P.O. Box 286 Hungary
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9
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Camelio AM, Liang Y, Eliasen AM, Johnson TC, Yuan C, Schuppe AW, Houk KN, Siegel D. Computational and Experimental Studies of Phthaloyl Peroxide-Mediated Hydroxylation of Arenes Yield a More Reactive Derivative, 4,5-Dichlorophthaloyl Peroxide. J Org Chem 2015. [PMID: 26200205 DOI: 10.1021/acs.joc.5b01079] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The oxidation of arenes by the reagent phthaloyl peroxide provides a new method for the synthesis of phenols. A new, more reactive arene oxidizing reagent, 4,5-dichlorophthaloyl peroxide, computationally predicted and experimentally determined to possess enhanced reactivity, has expanded the scope of the reaction while maintaining a high level of tolerance for diverse functional groups. The reaction proceeds through a novel "reverse-rebound" mechanism with diradical intermediates. Mechanistic insight was achieved through isolation and characterization of minor byproducts, determination of linear free energy correlations, and computational analysis of substituent effects of arenes, each of which provided additional support for the reaction proceeding through the diradical pathway.
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Affiliation(s)
- Andrew M Camelio
- †Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | | | - Anders M Eliasen
- †Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.,§Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92037, United States
| | - Trevor C Johnson
- †Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.,§Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92037, United States
| | - Changxia Yuan
- †Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | - Alex W Schuppe
- †Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States
| | | | - Dionicio Siegel
- †Department of Chemistry, The University of Texas at Austin, Austin, Texas 78712, United States.,§Skaggs School of Pharmacy and Pharmaceutical Sciences, University of California, San Diego, La Jolla, California 92037, United States
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10
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Fujiwara S, Cadou R, Yamaoka Y, Takasu K, Yamada KI. Hydrostannylation-Cross-Coupling Strategy for the Stereoselective Synthesis of Alkylidenemalonates and Related α,β-Unsaturated Esters. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403429] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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11
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Ravindar K, Caron PY, Deslongchamps P. Anionic Polycyclization Entry to Tricycles Related to Quassinoids and Terpenoids: A Stereocontrolled Total Synthesis of (+)-Cassaine. J Org Chem 2014; 79:7979-99. [DOI: 10.1021/jo501122k] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kontham Ravindar
- Département
de Chimie, Faculté des Sciences et de Génie, Pavillon
Alexandre-Vachon, Université Laval, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, Canada
| | - Pierre-Yves Caron
- Département
de Chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
| | - Pierre Deslongchamps
- Département
de Chimie, Faculté des Sciences et de Génie, Pavillon
Alexandre-Vachon, Université Laval, 1045 avenue de la Médecine, Québec, Québec G1V 0A6, Canada
- Département
de Chimie, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada
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12
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Fuse S, Yoshida H, Oosumi K, Takahashi T. Rapid and Structurally Diverse Synthesis of Multi-Substituted β-Keto Amide Derivatives Based on a Dioxinone Scaffold. European J Org Chem 2014. [DOI: 10.1002/ejoc.201402478] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Morcillo SP, Miguel D, Resa S, Martín-Lasanta A, Millán A, Choquesillo-Lazarte D, García-Ruiz JM, Mota AJ, Justicia J, Cuerva JM. Ti(III)-catalyzed cyclizations of ketoepoxypolyprenes: control over the number of rings and unexpected stereoselectivities. J Am Chem Soc 2014; 136:6943-51. [PMID: 24766517 DOI: 10.1021/ja411942h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We describe a new strategy to control the number of cyclization steps in bioinspired radical (poly)cyclizations involving epoxypolyenes containing keto units positioned along the polyene chain. This approach provides an unprecedentedly straightforward access to natural terpenoids with pendant unsaturated side chains. Additionally, in the case of bi- and tricyclizations, decalins with cis stereochemistry have been obtained as a consequence of the presence of the ketone. The preferential formation of cis-fused adducts was rationalized using DFT calculations. This result is completely unprecedented in biomimetic cyclizations and permits the access to natural terpenoids with this stereochemistry, as well as to non-natural analogues.
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Affiliation(s)
- Sara P Morcillo
- Department of Organic Chemistry and ‡Department of Inorganic Chemistry, Faculty of Sciences, University of Granada , C. U. Fuentenueva s/n, 18071 Granada, Spain
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14
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Ravindar K, Caron PY, Deslongchamps P. Total Synthesis of (+)-Cassaine Utilizing an Anionic Polycyclization Strategy. Org Lett 2013; 15:6270-3. [DOI: 10.1021/ol4030937] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kontham Ravindar
- Département de Chimie, Faculté des Sciences et de Génie, Pavillon Alexandre-Vachon, Université Laval, 1045, avenue de la Médecine, Québec City, QC G1V 0A6, Canada, and Département de Chimie, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1 Canada
| | - Pierre-Yves Caron
- Département de Chimie, Faculté des Sciences et de Génie, Pavillon Alexandre-Vachon, Université Laval, 1045, avenue de la Médecine, Québec City, QC G1V 0A6, Canada, and Département de Chimie, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1 Canada
| | - Pierre Deslongchamps
- Département de Chimie, Faculté des Sciences et de Génie, Pavillon Alexandre-Vachon, Université Laval, 1045, avenue de la Médecine, Québec City, QC G1V 0A6, Canada, and Département de Chimie, Université de Sherbrooke, Sherbrooke, QC, J1K 2R1 Canada
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15
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16
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Meister AC, Lang M, Nieger M, Bräse S. 4-(2-Hydroxyethoxy)phenol. Acta Crystallogr Sect E Struct Rep Online 2013; 69:o1303-4. [PMID: 24109380 PMCID: PMC3793793 DOI: 10.1107/s1600536813019818] [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: 06/27/2013] [Accepted: 07/17/2013] [Indexed: 12/03/2022]
Abstract
The asymmetric unit of the title compound, C8H10O3, contains four molecules, which differ in the orientation of the hydroxyethyl group [O—C—C—O torsion angles = −168.89 (17), 72.9 (2), −65.8 (2) and 71.8 (2)°], as well as the orientation of the hydroxy H atoms. Furthermore, the crystal structure displays two different types of strong hydrogen bond. The first is between an alcohol O—H and another alcohol O atom, and the second between an alcohol O—H group and an ether O atom. Additional weak hydrogen bonds between C—H groups and ether O atoms stabilize the structure.
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17
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Xiao Q, Young K, Zakarian A. An efficient synthesis of the fully elaborated isoindolinone unit of muironolide A. Org Lett 2013; 15:3314-7. [PMID: 23826676 DOI: 10.1021/ol401354a] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
An efficient stereocontrolled construction of the fully substituted isoindolone subunit of muironolide A is described. The approach is centered on the intramolecular Diels-Alder reaction between the enol form of the β-keto amide and an α,β,γ,δ-unsaturated ester, followed by the installation of the cyclohexene double bond.
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Affiliation(s)
- Qing Xiao
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106-9510, USA
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18
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Hu Y, Kamitanaka T, Mishima Y, Dohi T, Kita Y. Brønsted Acid-Controlled [3 + 2] Coupling Reaction of Quinone Monoacetals with Alkene Nucleophiles: A Catalytic System of Perfluorinated Acids and Hydrogen Bond Donor for the Construction of Benzofurans. J Org Chem 2013; 78:5530-43. [DOI: 10.1021/jo400613z] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yinjun Hu
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577,
Japan
| | - Tohru Kamitanaka
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577,
Japan
| | - Yusuke Mishima
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577,
Japan
| | - Toshifumi Dohi
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577,
Japan
| | - Yasuyuki Kita
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577,
Japan
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19
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Tin Tetrachloride-Catalyzed Regiospecific Allylic Substitution of Quinone Monoketals: An Easy Entry to Benzofurans and Coumestans. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201200344] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Chassaing S, Specklin S, Weibel JM, Pale P. Vinyl triflates derived from 1,3-dicarbonyl compounds and analogs: access and applications to organic synthesis. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.05.107] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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21
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Heasley B. Chemical synthesis of the cardiotonic steroid glycosides and related natural products. Chemistry 2012; 18:3092-120. [PMID: 22354477 DOI: 10.1002/chem.201103733] [Citation(s) in RCA: 67] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The active components from the extracts of Digitalis, cardiotonic steroid glycosides, have been ingested by humans for more than 200 years as a medicinal therapy for heart failure and abnormal heart rhythms. The positive inotropic activity of the cardiotonic steroids that mediates clinically useful physiological effects in patients has been attributed largely to a high affinity inhibitory interaction with the extracellular surface of the membrane-bound sodium pump (Na(+)/K(+)-ATPase). However, previously unrecognized intracellular signaling pathways continue to be uncovered. This Review examines both partial and de novo synthetic approaches to the medicinally important and structurally captivating cardenolide and bufadienolide steroid families, with an emphasis on the stereocontrolled construction of the pharmacophoric aglycone (genin) framework.
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Affiliation(s)
- Brian Heasley
- Scynexis, Inc. P. O. Box 12878, Research Triangle Park, NC 27709-2878, USA.
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