1
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Bodinier F, Lannou MI, Sorin G. Low-valent titanium(II) mediated intramolecular and regioselective alkyne/alkoxyallene reductive coupling reactions. Chem Commun (Camb) 2024; 60:1786-1789. [PMID: 38258500 DOI: 10.1039/d3cc06084e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2024]
Abstract
Low-valent titanium(II) complexes turned out to be suitable reagents in the promotion of alkyne/alkoxyallene coupling reactions in an intramolecular fashion. The conditions developed herein led to a broad range of highly functionalized cyclic adducts with excellent regioselectivities toward the central carbon of the alkoxyallene moiety. Good yields (up to 76%) were obtained over 19 examples. One-pot late functionalization by electrophile trapping was also possible and led to excellent diastereoselectivities (up to 95/5 d.r.).
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Affiliation(s)
- Florent Bodinier
- Unité CNRS UMR 8038 Université Paris Cité, Faculté de Pharmacie, Sorbonne Paris Cité, 4 avenue de l'Observatoire, PARIS 75270, cedex 06, France
| | - Marie-Isabelle Lannou
- Unité CNRS UMR 8038 Université Paris Cité, Faculté de Pharmacie, Sorbonne Paris Cité, 4 avenue de l'Observatoire, PARIS 75270, cedex 06, France
| | - Geoffroy Sorin
- Unité CNRS UMR 8038 Université Paris Cité, Faculté de Pharmacie, Sorbonne Paris Cité, 4 avenue de l'Observatoire, PARIS 75270, cedex 06, France
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2
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Renzi P, Azzi E, Bessone E, Ghigo G, Parisotto S, Pellegrino F, Deagostino A. Blue light enhanced Heck arylation at room temperature applied to allenes. Org Chem Front 2022. [DOI: 10.1039/d1qo01631h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
A blue light enhanced synthesis of 2-vinyl pirrolidines and piperidines through a domino Heck arylation–cyclisation applied to allenyl amines is described. Essential is the role of the light in the aryl migration in the carbo-palladation step.
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Affiliation(s)
- Polyssena Renzi
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
| | - Emanuele Azzi
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
| | - Enrico Bessone
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
| | - Giovanni Ghigo
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
| | - Stefano Parisotto
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
| | - Francesco Pellegrino
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
| | - Annamaria Deagostino
- Department of Chemistry, University of Torino, Via Pietro Giuria, 7, 10125 Torino, Italy
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3
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Kamitanaka T, Tsunoda Y, Fujita Y, Dohi T, Kita Y. [3 + 2] Coupling of Quinone Monoacetals with Vinyl Ethers Effected by Tetrabutylammonium Triflate: Regiocontrolled Synthesis of 2-Oxygenated Dihydrobenzofurans. Org Lett 2021; 23:9025-9029. [PMID: 34748356 DOI: 10.1021/acs.orglett.1c02792] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
The synthesis of 2-oxygenated dihydrobenzofurans involving the [3 + 2] coupling of quinone monoacetals with vinyl ethers has been realized by tetrabutylammonium triflate catalysis. The reaction involves a new activation method of the acetal moiety in quinone monoacetals under acid-free conditions affording the highly oxygenated dihydrobenzofurans. This new activation mode was achieved by using the triflate anion catalyst for stabilization of the highly reactive cationic intermediate.
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Affiliation(s)
- Tohru Kamitanaka
- Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Yusuke Tsunoda
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Yuriko Fujita
- College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Toshifumi Dohi
- Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan.,College of Pharmaceutical Sciences, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
| | - Yasuyuki Kita
- Research Organization of Science and Technology, Ritsumeikan University, 1-1-1 Nojihigashi, Kusatsu, Shiga 525-8577, Japan
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4
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Ni HQ, Cooper P, Engle KM. Recent advances in palladium-catalyzed (hetero)annulation of C[double bond, length as m-dash]C bonds with ambiphilic organo(pseudo)halides. Chem Commun (Camb) 2021; 57:7610-7624. [PMID: 34278397 DOI: 10.1039/d1cc02836g] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Palladium has proven to be effective in catalyzing the (hetero)annulation of C[double bond, length as m-dash]C bonds with ambiphilic organo(pseudo)halides. Through the employment of appropriate ambiphilic coupling partners, efficient annulation of a variety of allenes, 1,3-dienes, strained alkenes, styrenes, and other C[double bond, length as m-dash]C bond variants can be achieved to provide direct access to numerous useful hetero- and carbocyclic scaffolds. In this Feature Article, we summarize palladium-catalyzed (hetero)annulation methods reported since 2005 (spanning just over 15 years) and discuss outstanding challenges in this area of study.
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Affiliation(s)
- Hui-Qi Ni
- The Scripps Research Institute, Department of Chemistry, 10550 N. Torrey Pines Rd, La Jolla, California, USA.
| | - Phillippa Cooper
- The Scripps Research Institute, Department of Chemistry, 10550 N. Torrey Pines Rd, La Jolla, California, USA.
| | - Keary M Engle
- The Scripps Research Institute, Department of Chemistry, 10550 N. Torrey Pines Rd, La Jolla, California, USA.
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5
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Tayama E, Ishikawa Y. Brønsted Acid-Catalyzed Aza-Ferrier Reaction of N, O-Allenyl Acetals: Synthesis of β-Amino-α-methylene Aldehydes. J Org Chem 2020; 85:9405-9414. [PMID: 32515196 DOI: 10.1021/acs.joc.0c01047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A Tf2NH-catalyzed aza-Ferrier reaction of N,O-allenyl acetals was reported. This protocol provided various types of β-amino-α-methylene aldehydes as the products. The N,O-allenyl acetal substrates were easily prepared by base-induced isomerization of N,O-propargyl acetals with Triton B. The N,O-propargyl acetals were prepared from the corresponding aldehydes or lactams. Further synthetic applications of the products were also described.
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Affiliation(s)
- Eiji Tayama
- Department of Chemistry, Faculty of Science, Niigata University, Niigata, 950-2181, Japan
| | - Yuki Ishikawa
- Graduate School of Science and Technology, Niigata University, Niigata 950-2181, Japan
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6
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Parisotto S, Deagostino A. Synthesis of Highly Functionalized Allylic Alcohols from Vinyl Oxiranes and N-Tosylhydrazones via a Tsuji–Trost-Like “Palladium–Iodide” Catalyzed Coupling. Org Lett 2018; 20:6891-6895. [DOI: 10.1021/acs.orglett.8b03026] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Stefano Parisotto
- Department of Chemistry, University of Torino, Via Giuria, 7, Torino 10125, Italy
| | - Annamaria Deagostino
- Department of Chemistry, University of Torino, Via Giuria, 7, Torino 10125, Italy
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7
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Parisotto S, Palagi L, Prandi C, Deagostino A. Cooperative Iodide Pd(0)-Catalysed Coupling of Alkoxyallenes and N
-Tosylhydrazones: A Selective Synthesis of Conjugated and Skipped Dienes. Chemistry 2018; 24:5484-5488. [DOI: 10.1002/chem.201800765] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Indexed: 01/02/2023]
Affiliation(s)
- Stefano Parisotto
- Department of Chemistry; University of Torino; Via Giuria 7 Torino 10125 Italy
| | - Lorenzo Palagi
- Department of Chemistry; University of Torino; Via Giuria 7 Torino 10125 Italy
| | - Cristina Prandi
- Department of Chemistry; University of Torino; Via Giuria 7 Torino 10125 Italy
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8
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Abstract
Alkoxyallenes are unusually versatile C3 building blocks in organic synthesis. Hence this tutorial review summarizes the most important transformations, including subsequent reactions and their applications in the synthesis of relevant compounds, e.g. natural products. The reactivity patterns involved and the synthons derived from alkoxyallenes are presented. Often alkoxyallenes can serve as substitutes of acrolein or acrolein acetals, utilisation of which has already led to interesting products. Most important is the use of lithiated alkoxyallenes which smoothly react with a variety of electrophiles and lead to products with unique substitution patterns. The heterocycles or carbocycles formed are intermediates for the stereoselective synthesis of natural products or for the preparation of other structurally relevant compounds. The different synthons being put into practice by the use of lithiated alkoxyallenes in these variations will be discussed.
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Affiliation(s)
- Reinhold Zimmer
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustrasse 3, 14195 Berlin, Germany.
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9
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Toppino A, Arru P, Bianco N, Prandi C, Venturello P, Deagostino A. Synthesis of Highly Functionalised Dihydrobenzofurans and Indolines by Palladium-Catalysed Mizoroki-Heck-Heteroannulation Cascade Reactions of Alkoxy-1,3-dienes. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300972] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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10
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Lechel T, Pfrengle F, Reissig HU, Zimmer R. Three Carbons for Complexity! Recent Developments of Palladium-Catalyzed Reactions of Allenes. ChemCatChem 2013. [DOI: 10.1002/cctc.201200875] [Citation(s) in RCA: 112] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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La Clair JJ, Rheingold AL, Burkart MD. Ganodone, a bioactive benzofuran from the fruiting bodies of Ganoderma tsugae. JOURNAL OF NATURAL PRODUCTS 2011; 74:2045-2051. [PMID: 21939217 DOI: 10.1021/np200361y] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Extracts of Ganoderma tsugae, also known as the Hemlock varnish shelf mushroom, and related Reishi mushrooms are well documented in traditional Chinese medicine. Several Ganoderma sp. are currently cultivated for use in coffee, teas, and dietary supplements. We now report on the isolation and characterization of an unprecedented benzofuran, ganodone (1), from the fruiting bodies of mature growth G. tsugae. This discovery provides a key next step in evaluating the active components in their associated herbal supplements.
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Affiliation(s)
- James J La Clair
- Xenobe Research Institute, P.O. Box 3052, San Diego, California 92163-1052, United States.
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12
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Masters KS, Wallesch M, Bräse S. ortho-Bromo(propa-1,2-dien-1-yl)arenes: Substrates for Domino Reactions. J Org Chem 2011; 76:9060-7. [DOI: 10.1021/jo201679s] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Kye-Simeon Masters
- Institut für Organische
Chemie, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg
6, 76131 Karlsruhe, Germany
| | - Manuela Wallesch
- Institut für Organische
Chemie, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg
6, 76131 Karlsruhe, Germany
| | - Stefan Bräse
- Institut für Organische
Chemie, Karlsruher Institut für Technologie (KIT), Fritz-Haber-Weg
6, 76131 Karlsruhe, Germany
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