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1
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Yaragorla S, Khan T, Raoof J. Cu-Catalyzed Oxidative C(sp 2)-H Cycloetherification of o-Alkenyl Arenols for the Preparation of Fused Furans. J Org Chem 2024; 89:34-43. [PMID: 38079266 DOI: 10.1021/acs.joc.3c01251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
A practically efficient, copper-catalyzed approach for the synthesis of functionally embellished indeno-naphthofurans is developed from 1-(1H-inden-3-yl)naphthalen-2-ols. This intramolecular cycloetherification proceeds via C(sp2)-H oxygenation (C-H bond breaking and C-O bond forming), which enables the atom-economical synthesis of poly fused furans in high yields with large substrate diversity in the open air.
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Affiliation(s)
- Srinivasarao Yaragorla
- School of Chemistry, University of Hyderabad, P.O. Central University, Gachibowli, Hyderabad 500046, India
| | - Tabassum Khan
- School of Chemistry, University of Hyderabad, P.O. Central University, Gachibowli, Hyderabad 500046, India
| | - Jazeel Raoof
- School of Chemistry, University of Hyderabad, P.O. Central University, Gachibowli, Hyderabad 500046, India
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2
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Khan T, Rajesh P, Praveen D, Jose KVJ, Yaragorla S. Brønsted Acid Promoted Thermal-Ring-Rearrangement of Fluorenopyrans to 2-(1 H
-Inden-3-yl)-9 H
-fluoren-3-ols Bearing Two All-Carbon-Quaternary Centres. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000251] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Tabassum Khan
- School of Chemistry; University of Hyderabad; P.O. Central University, Gachibowli 500046 Hyderabad Telangana State India
| | - P. Rajesh
- School of Chemistry; University of Hyderabad; P.O. Central University, Gachibowli 500046 Hyderabad Telangana State India
| | - Dudam Praveen
- School of Chemistry; University of Hyderabad; P.O. Central University, Gachibowli 500046 Hyderabad Telangana State India
| | - K. V. Jovan Jose
- School of Chemistry; University of Hyderabad; P.O. Central University, Gachibowli 500046 Hyderabad Telangana State India
| | - Srinivasarao Yaragorla
- School of Chemistry; University of Hyderabad; P.O. Central University, Gachibowli 500046 Hyderabad Telangana State India
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Aiken S, de Azevedo ODCC, Chauhan K, Driscoll T, Elliott PI, Gabbutt CD, Heron BM. Base-Mediated Ring-Contraction of Pyran Systems Promoted by Palladium and Phase-Transfer Catalysis. J Org Chem 2020; 85:952-966. [PMID: 31860300 DOI: 10.1021/acs.joc.9b02901] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A study of the ring-contraction of a model 3H-naphtho[2,1-b]pyran is described to elucidate and optimize the ring-contraction of naphthopyrans. Two efficient base-mediated protocols to access multiple naphthofurans, naphthodifurans, and a benzo-fused indole in generally good yields are reported. Furthermore, a protocol to selectively prepare (hetero)aryl-substituted naphthofurans via a Suzuki-coupling-ring-contraction process is presented. An additional protocol that allows Suzuki cross-coupling reactions to be performed on bromo-substituted naphthopyrans without the ring-contraction side reaction is reported.
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Affiliation(s)
- Stuart Aiken
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
| | - Orlando D C C de Azevedo
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
| | - Kieran Chauhan
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
| | - Thomas Driscoll
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
| | - Paul I Elliott
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
| | - Christopher D Gabbutt
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
| | - B Mark Heron
- Department of Chemical Sciences, School of Applied Sciences , University of Huddersfield , Queensgate , Huddersfield HD1 3DH , U.K
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4
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Affiliation(s)
- Antonia Rinaldi
- Dipartimento di Chimica "U. Schiff"; Università degli Studi di Firenze; Via della Lastruccia 13 50019 Sesto F.no Italy
| | - Dina Scarpi
- Dipartimento di Chimica "U. Schiff"; Università degli Studi di Firenze; Via della Lastruccia 13 50019 Sesto F.no Italy
| | - Ernesto G. Occhiato
- Dipartimento di Chimica "U. Schiff"; Università degli Studi di Firenze; Via della Lastruccia 13 50019 Sesto F.no Italy
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