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Ghosh S, Zheng Y, Maccarone D, Korsaye FA, Ciofini I, Miesch L. Triton B-promoted regioselective intramolecular addition of enolates to tethered ynamides for the construction of 8-membered O-heterocycles. Org Chem Front 2022. [DOI: 10.1039/d2qo00873d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Benzo-1,5 dioxocines have been synthesized via unique ynamides tethered to propargylic ethers. Triton B allowed a proximal enol addition on the N-allenamide creating shelf-stable 8-membered-O-heterocycles with a broad functional group tolerance.
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Affiliation(s)
- Santanu Ghosh
- Equipe Synthèse Organique et Phytochimie, Institut de Chimie, CNRS-UdS, UMR 7177, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg, France
| | - Yongxiang Zheng
- Equipe Synthèse Organique et Phytochimie, Institut de Chimie, CNRS-UdS, UMR 7177, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg, France
| | - Daniele Maccarone
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Chemical Theory and Modelling Group, F-75005 Paris, France
| | - Feven-Alemu Korsaye
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Chemical Theory and Modelling Group, F-75005 Paris, France
| | - Ilaria Ciofini
- Chimie ParisTech, PSL University, CNRS, Institute of Chemistry for Life and Health Sciences, Chemical Theory and Modelling Group, F-75005 Paris, France
| | - Laurence Miesch
- Equipe Synthèse Organique et Phytochimie, Institut de Chimie, CNRS-UdS, UMR 7177, 4 rue Blaise Pascal, CS 90032, 67081, Strasbourg, France
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Javorskis T, Karpavičienė I, Jurys A, Snarskis G, Bukšnaitienė R, Orentas E. An Enolate‐Structure‐Enabled Anionic Cascade Cyclization Reaction: Easy Access to Complex Scaffolds with Contiguous Six‐, Five‐, and Four‐Membered Rings. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202008317] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Tomas Javorskis
- Department of Organic Chemistry Vilnius University Naugarduko 24 03225 Vilnius Lithuania
- Center for Physical Sciences and Technology Saulėtekio av. 3 10257 Vilnius Lithuania
| | - Ieva Karpavičienė
- Department of Organic Chemistry Vilnius University Naugarduko 24 03225 Vilnius Lithuania
| | - Arminas Jurys
- Department of Organic Chemistry Vilnius University Naugarduko 24 03225 Vilnius Lithuania
| | - Gustautas Snarskis
- Center for Physical Sciences and Technology Saulėtekio av. 3 10257 Vilnius Lithuania
| | - Rita Bukšnaitienė
- Department of Organic Chemistry Vilnius University Naugarduko 24 03225 Vilnius Lithuania
| | - Edvinas Orentas
- Department of Organic Chemistry Vilnius University Naugarduko 24 03225 Vilnius Lithuania
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3
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Javorskis T, Karpavičienė I, Jurys A, Snarskis G, Bukšnaitienė R, Orentas E. An Enolate-Structure-Enabled Anionic Cascade Cyclization Reaction: Easy Access to Complex Scaffolds with Contiguous Six-, Five-, and Four-Membered Rings. Angew Chem Int Ed Engl 2020; 59:20120-20128. [PMID: 32697013 DOI: 10.1002/anie.202008317] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2020] [Revised: 07/12/2020] [Indexed: 01/07/2023]
Abstract
Catalyst-free addition of ketone enolate to non-activated multiple C-C bonds involves non-complementary reaction partners and typically requires super-basic conditions. On the other hand, highly aggregated or solvated enolates are not reactive enough to undergo direct addition to alkenes or alkynes. Herein, we report a new anionic cascade reaction for one-step assembly of intriguing molecular scaffolds possessing contiguous six-, five-, and four-membered rings, representing a formal [2+2] enol-allene cycloaddition. Reaction proceeds under very mild conditions and with excellent diastereoselectivity. Deeper mechanistic and computational studies revealed unusually slow proton transfer phenomenon in cyclic ketone intermediate and explained peculiar stereochemical outcome.
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Affiliation(s)
- Tomas Javorskis
- Department of Organic Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania.,Center for Physical Sciences and Technology, Saulėtekio av. 3, 10257, Vilnius, Lithuania
| | - Ieva Karpavičienė
- Department of Organic Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania
| | - Arminas Jurys
- Department of Organic Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania
| | - Gustautas Snarskis
- Center for Physical Sciences and Technology, Saulėtekio av. 3, 10257, Vilnius, Lithuania
| | - Rita Bukšnaitienė
- Department of Organic Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania
| | - Edvinas Orentas
- Department of Organic Chemistry, Vilnius University, Naugarduko 24, 03225, Vilnius, Lithuania
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Zhan XY, Zhang H, Dong Y, Yang J, He S, Shi ZC, Tang L, Wang JY. Chemoselective Hydrosilylation of the α,β-Site Double Bond in α,β- and α,β,γ,δ-Unsaturated Ketones Catalyzed by Macrosteric Borane Promoted by Hexafluoro-2-propanol. J Org Chem 2020; 85:6578-6592. [PMID: 32316729 DOI: 10.1021/acs.joc.0c00568] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The B(C6F5)3-catalyzed chemoselective hydrosilylation of α,β- and α,β,γ,δ-unsaturated ketones into the corresponding non-symmetric ketones in mild reaction conditions is developed. Nearly 55 substrates including those bearing reducible functional groups such as alkynyl, alkenyl, cyano, and aromatic heterocycles are chemoselectively hydrosilylated in good to excellent yields. Isotope-labeling studies revealed that hexafluoro-2-propanol also served as a hydrogen source in the process.
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Affiliation(s)
- Xiao-Yu Zhan
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Hua Zhang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Yu Dong
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Jian Yang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China.,University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Shuai He
- Southwest Minzu University, Chengdu 610041, P. R. China
| | - Zhi-Chuan Shi
- Southwest Minzu University, Chengdu 610041, P. R. China
| | - Lei Tang
- Laboratory of Anaesthesia & Critical Care Medicine, Translational Neuroscience Center and Department of Anaesthesiology, West China Hospital, Sichuan University, Chengdu 610041, P. R. China
| | - Ji-Yu Wang
- Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, PR China
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5
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Scherrer V, Jackson-Mülly M, Zsindely J, Schmid H. Basenkatalysierte Cyclisierungen von 2-(2-Propinyl)oxybenzamiden. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19780610220] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Alder AC, Rüedi P, Eugster CH. Plectranthone A, B, C und D. Diterpenoide Phenanthren-1,4-dione aus Blattdrüsen einerPlectranthuus sp.(Labiatae). Helv Chim Acta 2004. [DOI: 10.1002/hlca.19840670412] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kaliakoudas D, Eugster CH, Rüedi P. Synthese von Plectranthonen, diterpenoiden Phenanthren-1,4-chinonen. Helv Chim Acta 2004. [DOI: 10.1002/hlca.19900730105] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Shafizadeh F, Furneaux RH, Pang D, Stevenson TT. Base-catalyzed oligomerization of levoglucosenone. Carbohydr Res 1982. [DOI: 10.1016/s0008-6215(00)81044-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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