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Maurya JP, Swain SS, Ramasastry SSV. Phosphine-promoted intramolecular Rauhut-Currier/Wittig reaction cascade to access (hetero)arene-fused diquinanes. Org Biomol Chem 2024. [PMID: 38919118 DOI: 10.1039/d4ob00984c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/27/2024]
Abstract
We describe the first phosphine-promoted intramolecular Rauhut-Currier reaction that triggers an intramolecular Wittig process assembling new classes of diquinanes. The one-pot strategy provides ready access to simple diquinanes and various (hetero)arene-fused diquinanes incorporated with up to two contiguous all-carbon quaternary centers under metal-free and neutral conditions. We showcased the generality of the method on a broad range of substrates and demonstrated its synthetic utility in accessing various advanced intermediates relevant to natural product synthesis and material science.
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Affiliation(s)
- Jay Prakash Maurya
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
| | - Subham S Swain
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
| | - S S V Ramasastry
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, S. A. S. Nagar, Punjab 140306, India.
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Jamis-Oliva O, López R, Galdámez A, Gallardo-Fuentes S, Vilches-Herrera M. Non-covalent interactions in the diastereoselective synthesis of cis-2,3-dihydrobenzofurans: experimental and computational studies. Org Biomol Chem 2024; 22:1441-1446. [PMID: 38265299 DOI: 10.1039/d3ob02070c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
The diastereoselective synthesis of 2,3-DHBs has been previously reported via an intramolecular Michael addition reaction using alkali bases such as Cs2CO3 and K2CO3. However, no systematic study has been performed to understand the possible role of bases in the mechanism of the reaction and factors behind the stereoselective outcome of the reaction. Herein, from experimental and theoretical points of view, we disclose the role of the cesium salt in the rate-determining step along the catalytic cycle and the key role of stabilizing non-covalent interactions in the stereoselective outcome of the reaction.
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Affiliation(s)
- Omar Jamis-Oliva
- Faculty of Sciences, University of Chile, Department of Chemistry, Las Palmeras 3425, Ñuñoa, 7750000, Santiago, Chile.
| | - Roger López
- Faculty of Sciences, University of Chile, Department of Chemistry, Las Palmeras 3425, Ñuñoa, 7750000, Santiago, Chile.
| | - Antonio Galdámez
- Faculty of Sciences, University of Chile, Department of Chemistry, Las Palmeras 3425, Ñuñoa, 7750000, Santiago, Chile.
| | - Sebastián Gallardo-Fuentes
- Instituto de Química, Facultad de Ciencias, Pontificia Universidad Católica de Valparaíso, Avenida Universidad 330, Curauma, 2373223, Valparaíso, Chile
| | - Marcelo Vilches-Herrera
- Faculty of Sciences, University of Chile, Department of Chemistry, Las Palmeras 3425, Ñuñoa, 7750000, Santiago, Chile.
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