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Cui M, Li J, Tian R, Duan Z. Tandem [5 + 1]/[8 + 2] cycloaddition reactions involving phosphiranes and tropones: facile access to 6,5,7-fused tricyclic skeletons. Org Chem Front 2022. [DOI: 10.1039/d2qo00386d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Tandem [5 + 1] carbonyl cyclization/[8 + 2] cycloaddition reactions of phosphiranes and tropones were developed as a straightforward method to access 6,5,7-fused tricyclic scaffolds.
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Affiliation(s)
- Mingyue Cui
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, China
| | - Juan Li
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, China
| | - Rongqiang Tian
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, China
| | - Zheng Duan
- College of Chemistry, Green Catalysis Center, International Phosphorus Laboratory, International Joint Research Laboratory for Functional Organophosphorus Materials of Henan Province, Zhengzhou University, No. 100 Science Avenue, Zhengzhou, Henan, 450001, China
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Karas LJ, Campbell AT, Alabugin IV, Wu JI. Antiaromaticity Gain Activates Tropone and Nonbenzenoid Aromatics as Normal-Electron-Demand Diels-Alder Dienes. Org Lett 2020; 22:7083-7087. [PMID: 32856925 PMCID: PMC8124018 DOI: 10.1021/acs.orglett.0c02343] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We propose a carbonyl umpolung strategy for activating tropone as a normal-electron-demand Diels-Alder diene. Tropone has low reactivity for Diels-Alder reactions because of its [4n+2] π-aromaticity. Conversion of the carbonyl group into a hydrazone ion (═N-NR-) reverses the polarity of the exocyclic double bond, increases the [4n] ring π-antiaromaticity, and raises the HOMO energy. Computed gas-phase activation free energies for a Diels-Alder reaction with maleimide suggest a billion-fold rate increase when the tropone C═O is replaced by ═N-NR- (R = H or SO2CH3). Other nonbenzenoid aromatics can be activated as normal-electron-demand Diels-Alder dienes in the same way.
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Affiliation(s)
- Lucas J Karas
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
| | - Adam T Campbell
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Igor V Alabugin
- Department of Chemistry and Biochemistry, Florida State University, Tallahassee, Florida 32306, United States
| | - Judy I Wu
- Department of Chemistry, University of Houston, Houston, Texas 77204, United States
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Gritsch PJ, Gimenez-Nueno I, Wonilowicz L, Sarpong R. Copper-Catalyzed [4+2] Cycloaddition of 9 H-Cyclohepta[ b]pyridine-9-one and Electron-Rich Alkenes. J Org Chem 2019; 84:8717-8723. [PMID: 31244151 DOI: 10.1021/acs.joc.9b00899] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
9 H-Cyclohepta[ b]pyridin-9-one was used as a diene cycloaddition partner to construct [3.2.2] bicycles in a copper-catalyzed [4+2] cycloaddition. Oxygen- and nitrogen-substituted terminal, disubstituted, trisubstituted, and cyclic alkenes reacted to afford the cycloadducts as single constitutional isomers in 48-80% yields and diastereomeric ratios up to 5.6:1.
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Affiliation(s)
- Philipp J Gritsch
- Department of Chemistry , University of California, Berkeley , California 94720 , United States
| | - Irene Gimenez-Nueno
- Department of Chemistry , University of California, Berkeley , California 94720 , United States
| | - Laura Wonilowicz
- Department of Chemistry , University of California, Berkeley , California 94720 , United States
| | - Richmond Sarpong
- Department of Chemistry , University of California, Berkeley , California 94720 , United States
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Hammer N, Erickson JD, Lauridsen VH, Jakobsen JB, Hansen BK, Jacobsen KM, Poulsen TB, Jørgensen KA. Catalytic Asymmetric [4+2]‐Cycloadditions Using Tropolones: Developments, Scope, Transformations, and Bioactivity. Angew Chem Int Ed Engl 2018; 57:13216-13220. [DOI: 10.1002/anie.201808221] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2018] [Revised: 08/13/2018] [Indexed: 11/09/2022]
Affiliation(s)
- Niels Hammer
- Department of ChemistryAarhus University 8000 Aarhus C Denmark
| | | | | | | | - Bente K. Hansen
- Department of ChemistryAarhus University 8000 Aarhus C Denmark
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Hammer N, Erickson JD, Lauridsen VH, Jakobsen JB, Hansen BK, Jacobsen KM, Poulsen TB, Jørgensen KA. Catalytic Asymmetric [4+2]‐Cycloadditions Using Tropolones: Developments, Scope, Transformations, and Bioactivity. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201808221] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Niels Hammer
- Department of ChemistryAarhus University 8000 Aarhus C Denmark
| | | | | | | | - Bente K. Hansen
- Department of ChemistryAarhus University 8000 Aarhus C Denmark
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Okamura H, Iiji H, Hamada T, Iwagawa T, Furuno H. Diels–Alder reaction of α-tropolone and electron-deficient dienophiles prompted by Et3N or silica gel: a new synthetic method of highly functionalized homobarrelenone derivatives. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.036] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Matsumoto K, Hamana H, Iida H. Compendium of Cycloaddition Reactions under High Pressure. Helv Chim Acta 2005. [DOI: 10.1002/hlca.200590156] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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