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Boultwood T, Bull JA. Synthesis of Selenoaziridines: A Study on Stereochemical Outcomes of the Reaction of Aziridine Radicals and Anions Generated from Iodoaziridines. ACS OMEGA 2019; 4:870-879. [PMID: 31459364 PMCID: PMC6648590 DOI: 10.1021/acsomega.8b03019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/30/2018] [Accepted: 12/26/2018] [Indexed: 06/10/2023]
Abstract
The synthesis of a new functional group in the form of selenyl-substituted aziridines is described. Selenoaziridines are stereoselectively prepared by functionalization of intact aziridine precursors involving radical and anionic intermediates. Radicals are generated from cis-N-Ts iodoaziridines by activation of the C-I bond using alkoxides as a source of single electrons. These form predominantly trans-substituted selenoaziridines dependent on the size of the diselenide. cis-Aziridinyllithiums generated by Li-I exchange also react with diselenides stereospecifically to form a range of cis-selenoaziridines. Proposals for the stereochemical outcome are presented.
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Affiliation(s)
- Tom Boultwood
- Department
of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - James A. Bull
- Department
of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
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Tota A, St John-Campbell S, Briggs EL, Estévez GO, Afonso M, Degennaro L, Luisi R, Bull JA. Highly Chemoselective NH- and O-Transfer to Thiols Using Hypervalent Iodine Reagents: Synthesis of Sulfonimidates and Sulfonamides. Org Lett 2018; 20:2599-2602. [PMID: 29652511 DOI: 10.1021/acs.orglett.8b00788] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Aryl thiols can be selectively converted to sulfonimidates or sulfonamides with three new S-X connections being made selectively in one pot. Using hypervalent iodine reagents in the presence of ammonium carbamate, NH- and O-groups are transferred under mild and practical conditions. Reducing the loading of ammonium carbamate changed the product distribution, converting the sulfonimidate to the sulfonamide. Studies into the possible intermediate species are presented, suggesting that multiple pathways may be possible via sulfinate esters, or related intermediates, with each species forming the same products.
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Affiliation(s)
- Arianna Tota
- Department of Pharmacy-Drug Sciences , University of Bari , "A. Moro" Via E, Orabona 4 , Bari 70125 , Italy
| | - Sahra St John-Campbell
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
| | - Edward L Briggs
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
| | - Gala Ogalla Estévez
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
| | - Michelle Afonso
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
| | - Leonardo Degennaro
- Department of Pharmacy-Drug Sciences , University of Bari , "A. Moro" Via E, Orabona 4 , Bari 70125 , Italy
| | - Renzo Luisi
- Department of Pharmacy-Drug Sciences , University of Bari , "A. Moro" Via E, Orabona 4 , Bari 70125 , Italy
| | - James A Bull
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
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Boultwood T, Bull JA. Stereospecific Functionalization of Iodoaziridines via Unstabilized Aziridinyllithiums Generated by Iodine–Lithium Exchange. Org Lett 2014; 16:2740-3. [DOI: 10.1021/ol501024y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Tom Boultwood
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, U.K
| | - James A. Bull
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, U.K
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