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Inprung N, Ho HE, Rossi-Ashton JA, Epton RG, Whitwood AC, Lynam JM, Taylor RJK, James MJ, Unsworth WP. Indole-ynones as Privileged Substrates for Radical Dearomatizing Spirocyclization Cascades. Org Lett 2022; 24:668-674. [PMID: 34985297 DOI: 10.1021/acs.orglett.1c04098] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Indole-ynones have been established as general substrates for radical dearomatizing spirocyclization cascade reactions. Five distinct and varied synthetic protocols have been developed─cyanomethylation, sulfonylation, trifluoromethylation, stannylation and borylation─using a variety of radical generation modes, ranging from photoredox catalysis to traditional AIBN methods. The simple and easily prepared indole-ynones can be used to rapidly generate diverse, densely functionalized spirocycles and have the potential to become routinely used to explore radical reactivity. Experimental and computational investigations support the proposed radical cascade mechanism and suggest that other new methods are now primed for development.
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Affiliation(s)
- Nantachai Inprung
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Hon Eong Ho
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | | | - Ryan G Epton
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Adrian C Whitwood
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Jason M Lynam
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Richard J K Taylor
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - Michael J James
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
| | - William P Unsworth
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, U.K
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2
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Jin T, Suzuki S, Ho HE, Matsuyama H, Kawata M, Terada M. Pd-Catalyzed Indolization/ peri-C-H Annulation/ N-Dealkylation Cascade to Cyclopenta-Fused Acenaphtho[1,2- b]indole Scaffold. Org Lett 2021; 23:9431-9435. [PMID: 34851130 DOI: 10.1021/acs.orglett.1c03575] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel Pd-catalyzed cascade reaction of N,N-dialkyl-substituted o-alkynylanilines involving an indolization/peri-C-H annulation/N-dealkylation sequence has been developed to construct a cyclopenta-fused acenaphtho[1,2-b]indole (ANI) scaffold. A variety of aromatic hydrocarbons having a peri-C-H bond at the alkynyl terminus, such as naphthalene, phenanthrene, pyrene, and fluoranthene, were employed, affording the corresponding π-extended ANI derivatives. The ANI molecules showed relatively narrow energy gaps by increasing HOMOs and lowering LUMOs, implying their potential applications as π-segments in low-band-gap materials.
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Affiliation(s)
- Tienan Jin
- Research and Analytical Center for Giant Molecules, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Shin Suzuki
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Hon Eong Ho
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Hidenori Matsuyama
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Masaki Kawata
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
| | - Masahiro Terada
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai 980-8578, Japan
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3
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Ho HE, Pagano A, Rossi-Ashton JA, Donald JR, Epton RG, Churchill JC, James MJ, O'Brien P, Taylor RJK, Unsworth WP. Visible-light-induced intramolecular charge transfer in the radical spirocyclisation of indole-tethered ynones. Chem Sci 2019; 11:1353-1360. [PMID: 34123259 PMCID: PMC8148050 DOI: 10.1039/c9sc05311e] [Citation(s) in RCA: 64] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Indole-tethered ynones form an intramolecular electron donor–acceptor complex that can undergo visible-light-induced charge transfer to promote thiyl radical generation from thiols. This initiates a novel radical chain sequence, based on dearomatising spirocyclisation with concomitant C–S bond formation. Sulfur-containing spirocycles are formed in high yields using this simple and mild synthetic protocol, in which neither transition metal catalysts nor photocatalysts are required. The proposed mechanism is supported by various mechanistic studies, and the unusual radical initiation mode represents only the second report of the use of an intramolecular electron donor–acceptor complex in synthesis. Indole-tethered ynones form an intramolecular electron donor–acceptor complex that can undergo visible-light-induced charge transfer to promote thiyl radical generation from thiols.![]()
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Affiliation(s)
- Hon Eong Ho
- Department of Chemistry, University of York York YO10 5DD UK
| | - Angela Pagano
- Department of Chemistry and Industrial Chemistry, University of Genova via Dodecaneso, 31 16146 Genova Italy
| | | | - James R Donald
- Department of Chemistry, University of York York YO10 5DD UK
| | - Ryan G Epton
- Department of Chemistry, University of York York YO10 5DD UK
| | | | - Michael J James
- Department of Chemistry, University of York York YO10 5DD UK
| | - Peter O'Brien
- Department of Chemistry, University of York York YO10 5DD UK
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Ho HE, Stephens TC, Payne TJ, O’Brien P, Taylor RJK, Unsworth WP. Merging π-Acid and Pd Catalysis: Dearomatizing Spirocyclization/Cross-Coupling Cascade Reactions of Alkyne-Tethered Aromatics. ACS Catal 2018. [DOI: 10.1021/acscatal.8b03861] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Hon Eong Ho
- Department of Chemistry, University of York, York, U.K., YO10 5DD
| | | | - Thomas J. Payne
- Department of Chemistry, University of York, York, U.K., YO10 5DD
| | - Peter O’Brien
- Department of Chemistry, University of York, York, U.K., YO10 5DD
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Ho HE, James MJ, O’Brien P, Taylor RJK, Unsworth WP. Ag(I)-Catalyzed Synthesis of Azabicyclic Alkaloid Frameworks from Ketimine-Tethered Ynones: Total Synthesis of Indolizidine 209D. Org Lett 2018; 20:1439-1443. [DOI: 10.1021/acs.orglett.8b00225] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hon Eong Ho
- Department of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Michael J. James
- Department of Chemistry, University of York, Heslington, York YO10
5DD, U.K
| | - Peter O’Brien
- Department of Chemistry, University of York, Heslington, York YO10
5DD, U.K
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Zhang S, Ma H, Ho HE, Yamamoto Y, Bao M, Jin T. Pd-Catalyzed cascade cyclization of o-alkynylanilines via C–H/C–N bond cleavage leading to dibenzo[a,c]carbazoles. Org Biomol Chem 2018; 16:5236-5240. [DOI: 10.1039/c8ob01386a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new and efficient Pd-catalyzed cascade cyclization of biaryl-tethered o-alkynylanilines for the formation of dibenzo[a,c]carbazole derivatives has been reported.
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Affiliation(s)
- Sheng Zhang
- State Key Laboratory of Fine Chemicals and School of Chemistry
- Dalian University of Technology
- Dalian 116023
- China
- Department of Chemistry
| | - Hengmin Ma
- State Key Laboratory of Fine Chemicals and School of Chemistry
- Dalian University of Technology
- Dalian 116023
- China
| | - Hon Eong Ho
- Department of Chemistry
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Yoshinori Yamamoto
- State Key Laboratory of Fine Chemicals and School of Chemistry
- Dalian University of Technology
- Dalian 116023
- China
- Department of Chemistry
| | - Ming Bao
- State Key Laboratory of Fine Chemicals and School of Chemistry
- Dalian University of Technology
- Dalian 116023
- China
| | - Tienan Jin
- State Key Laboratory of Fine Chemicals and School of Chemistry
- Dalian University of Technology
- Dalian 116023
- China
- Department of Chemistry
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Abstract
A novel intramolecular oxidative diamination of bis(2-aminophenyl)acetylene for the synthesis of the structurally intriguing π-conjugated polyheterocyclic scaffold, 5,10-dihydroindolo[3,2-b]indole (DHII), has been developed under Cu(hfacac)2/O2 oxidation systems. The structure design of bis(2-aminophenyl)acetylene bearing both N,N-dimethylamine and primary amine groups is crucial for constructing the corresponding DHII scaffold. Notably, an intermolecular N-methyl transfer from the nitrogen atom of N,N-dimethylamine to the primary amine takes place, which is a critical step for the successful implementation of the present annulation process.
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Affiliation(s)
- Hon Eong Ho
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University , Sendai, 980-8577, Japan
| | - Kazuaki Oniwa
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University , Sendai, 980-8577, Japan
| | - Yoshinori Yamamoto
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University , Sendai, 980-8577, Japan.,State Key Laboratory of Fine Chemicals, Dalian University of Technology , Dalian, 116012, China
| | - Tienan Jin
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University , Sendai, 980-8577, Japan
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Ho HE, Ishikawa Y, Asao N, Yamamoto Y, Jin T. Highly efficient heterogeneous aerobic cross-dehydrogenative coupling via C–H functionalization of tertiary amines using a nanoporous gold skeleton catalyst. Chem Commun (Camb) 2015; 51:12764-7. [DOI: 10.1039/c5cc04856g] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We disclosed that zero-valent nanoporous gold (AuNPore) possesses remarkable catalytic activity and reusability for heterogeneous aerobic cross-dehydrogenative coupling (CDC) of various tertiary amines with nucleophiles.
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Affiliation(s)
- Hon Eong Ho
- WPI-Advanced Institute for Materials Research (WPI-AIMR)
- Tohoku University
- Sendai 980-8577
- Japan
| | - Yoshifumi Ishikawa
- WPI-Advanced Institute for Materials Research (WPI-AIMR)
- Tohoku University
- Sendai 980-8577
- Japan
| | - Naoki Asao
- WPI-Advanced Institute for Materials Research (WPI-AIMR)
- Tohoku University
- Sendai 980-8577
- Japan
| | - Yoshinori Yamamoto
- WPI-Advanced Institute for Materials Research (WPI-AIMR)
- Tohoku University
- Sendai 980-8577
- Japan
- State Key Laboratory of Fine Chemicals
| | - Tienan Jin
- WPI-Advanced Institute for Materials Research (WPI-AIMR)
- Tohoku University
- Sendai 980-8577
- Japan
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Ho HE, Asao N, Yamamoto Y, Jin T. Carboxylic Acid-Catalyzed Highly Efficient and Selective Hydroboration of Alkynes with Pinacolborane. Org Lett 2014; 16:4670-3. [DOI: 10.1021/ol502285s] [Citation(s) in RCA: 77] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Hon Eong Ho
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Naoki Asao
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
| | - Yoshinori Yamamoto
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
- State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Tienan Jin
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan
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Yan M, Jin T, Chen Q, Ho HE, Fujita T, Chen LY, Bao M, Chen MW, Asao N, Yamamoto Y. Unsupported Nanoporous Gold Catalyst for Highly Selective Hydrogenation of Quinolines. Org Lett 2013; 15:1484-7. [DOI: 10.1021/ol400229z] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Mei Yan
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Tienan Jin
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Qiang Chen
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Hon Eong Ho
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Takeshi Fujita
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Lu-Yang Chen
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Ming Bao
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Ming-Wei Chen
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Naoki Asao
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
| | - Yoshinori Yamamoto
- WPI-Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, Sendai 980-8577, Japan, and State Key Laboratory of Fine Chemicals, Dalian University of Technology, Dalian 116012, China
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