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Aziridine Ring Opening as Regio- and Stereoselective Access to C-Glycosyl-Aminoethyl Sulfide Derivatives. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27061764. [PMID: 35335129 PMCID: PMC8952378 DOI: 10.3390/molecules27061764] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 03/01/2022] [Accepted: 03/06/2022] [Indexed: 11/18/2022]
Abstract
A short synthetic route to stereoselective access to C-glycosyl-aminoethyl sulfide derivatives has been developed through the reaction of tributhyltin derivatives of glycals with aziridinecarboaldehyde and the regioselective ring opening of a chiral aziridine with thiophenol. The absolute configurations of the resulting diastereoisomers were determined by 1H NMR spectroscopy.
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2
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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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Chawner SJ, Cases‐Thomas MJ, Bull JA. Divergent Synthesis of Cyclopropane-Containing Lead-Like Compounds, Fragments and Building Blocks through a Cobalt Catalyzed Cyclopropanation of Phenyl Vinyl Sulfide. European J Org Chem 2017; 2017:5015-5024. [PMID: 28983191 PMCID: PMC5601191 DOI: 10.1002/ejoc.201701030] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Indexed: 01/08/2023]
Abstract
Cyclopropanes provide important design elements in medicinal chemistry and are widely present in drug compounds. Here we describe a strategy and extensive synthetic studies for the preparation of a diverse collection of cyclopropane-containing lead-like compounds, fragments and building blocks exploiting a single precursor. The bifunctional cyclopropane (E/Z)-ethyl 2-(phenylsulfanyl)-cyclopropane-1-carboxylate was designed to allow derivatization through the ester and sulfide functionalities to topologically varied compounds designed to fit in desirable chemical space for drug discovery. A cobalt-catalyzed cyclopropanation of phenyl vinyl sulfide affords these scaffolds on multigram scale. Divergent, orthogonal derivatization is achieved through hydrolysis, reduction, amidation and oxidation reactions as well as sulfoxide-magnesium exchange/functionalization. The cyclopropyl Grignard reagent formed from sulfoxide exchange is stable at 0 °C for > 2 h, which enables trapping with various electrophiles and Pd-catalyzed Negishi cross-coupling reactions. The library prepared, as well as a further virtual elaboration, is analyzed against parameters of lipophilicity (ALog P), MW and molecular shape by using the LLAMA (Lead-Likeness and Molecular Analysis) software, to illustrate the success in generating lead-like compounds and fragments.
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Affiliation(s)
- Stephen J. Chawner
- Department of ChemistryImperial College LondonSouth KensingtonSW7 2AZLondonUK
| | - Manuel J. Cases‐Thomas
- Lilly Research CentreEli Lilly and CompanyErl Wood Manor, Sunninghill RoadGU20 6PHWindleshamUK
| | - James A. Bull
- Department of ChemistryImperial College LondonSouth KensingtonSW7 2AZLondonUK
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Boultwood T, Affron DP, Bull JA. Studies on the synthesis of α-iodoaziridines and improved conditions for the synthesis of alkyl-α-iodoaziridines using ClMgCHI2. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.05.098] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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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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Knochel P, M. Barl N, Werner V, Sämann C. The Halogen/Magnesium-Exchange Using iPrMgCl·LiCl and Related Exchange Reagents. HETEROCYCLES 2014. [DOI: 10.3987/rev-13-sr(s)4] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Boultwood T, Affron DP, Trowbridge AD, Bull JA. Synthesis of cis-C-iodo-N-tosyl-aziridines using diiodomethyllithium: reaction optimization, product scope and stability, and a protocol for selection of stationary phase for chromatography. J Org Chem 2013; 78:6632-47. [PMID: 23738857 PMCID: PMC3805312 DOI: 10.1021/jo400956x] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Indexed: 11/29/2022]
Abstract
The preparation of C-iodo-N-Ts-aziridines with excellent cis-diastereoselectivity has been achieved in high yields by the addition of diiodomethyllithium to N-tosylimines and N-tosylimine-HSO2Tol adducts. This addition-cyclization protocol successfully provided a wide range of cis-iodoaziridines, including the first examples of alkyl-substituted iodoaziridines, with the reaction tolerating both aryl imines and alkyl imines. An ortho-chlorophenyl imine afforded a β-amino gem-diiodide under the optimized reaction conditions due to a postulated coordinated intermediate preventing cyclization. An effective protocol to assess the stability of the sensitive iodoaziridine functional group to chromatography was also developed. As a result of the judicious choice of stationary phase, the iodoaziridines could be purified by column chromatography; the use of deactivated basic alumina (activity IV) afforded high yield and purity. Rearrangements of electron-rich aryl-iodoaziridines have been promoted, selectively affording either novel α-iodo-N-Ts-imines or α-iodo-aldehydes in high yield.
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Affiliation(s)
- Tom Boultwood
- Department of Chemistry, Imperial College
London, South Kensington, London SW7 2AZ, United Kingdom
| | - Dominic P. Affron
- Department of Chemistry, Imperial College
London, South Kensington, London SW7 2AZ, United Kingdom
| | - Aaron D. Trowbridge
- Department of Chemistry, Imperial College
London, South Kensington, London SW7 2AZ, United Kingdom
| | - James A. Bull
- Department of Chemistry, Imperial College
London, South Kensington, London SW7 2AZ, United Kingdom
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Bull JA, Boultwood T, Taylor TA. Highly cis-selective synthesis of iodo-aziridines using diiodomethyllithium and in situ generated N-Boc-imines. Chem Commun (Camb) 2013; 48:12246-8. [PMID: 23149421 DOI: 10.1039/c2cc37029h] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The first preparation of iodoaziridines is described. The addition of diiodomethyllithium to N-Boc-imines affords these novel aziridines in high yields. The reaction proceeds in one-pot via a highly diastereoselective cyclisation of an amino gem-diiodide intermediate.
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Affiliation(s)
- James A Bull
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK.
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Hughes M, Boultwood T, Zeppetelli G, Bull JA. Palladium-catalyzed cross-coupling of aziridinylmetal species, generated by sulfinyl-magnesium exchange, with aryl bromides: reaction optimization, scope, and kinetic investigations. J Org Chem 2013; 78:844-54. [PMID: 23311879 DOI: 10.1021/jo3027824] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
A series of novel, highly substituted N-PMP aziridines have been accessed in high yields by palladium-catalyzed cross-coupling of intact aziridines. The cross-coupling employed aryl bromides and tertiary organometallic aziridines, generated from sulfinylaziridines by sulfinyl-magnesium exchange and transmetalation to the aziridinylzinc with zinc chloride. A wide range of electron-rich and electron-poor aryl bromides were utilized to afford the functionalized aziridine products as single diastereoisomers with retention of configuration at the reacting center. Assessment of the reaction kinetics showed zero-order in both the aziridine species and the aryl bromide. This indicated that the rate-determining step was reductive elimination from the palladium(II) species bearing both the aziridine and aryl groups to form the hindered C-C bond. The intermediate aziridinylzinc species underwent a progressive, background degradation that led to a plateau in yield and afforded reduced yields in substrates with ortho-substituted aryl groups, which are less reactive due to the additional steric demands.
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Affiliation(s)
- Matthew Hughes
- Department of Chemistry, Imperial College London, South Kensington, London SW7 2AZ, UK
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Saitoh H, Watanabe T, Kimura T, Kato Y, Satoh T. New synthesis of multisubstituted cyanocyclopropanes by the intramolecular SN2 alkylation and 1,3-CC insertion reaction of magnesium carbenoids as the key reactions. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.01.059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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11
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Synthesis, including asymmetric synthesis, of 3-oxabicyclo[3.1.0]hexanes and bicyclo[3.1.0]hexanes by the 1,5-CH insertion of cyclopropylmagnesium carbenoids as the key reaction. Tetrahedron 2012. [DOI: 10.1016/j.tet.2011.11.085] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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12
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Satoh T, Kashiwamura G, Nagamoto S, Sasaki Y, Sugiyama S. Insertion of cyclopropanes between a carbonyl carbon and an α-carbon of carbonyl compounds with cyclopropylmagnesium carbenoids. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.06.069] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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13
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Momochi H, Noguchi T, Miyagawa T, Ogawa N, Tadokoro M, Satoh T. The first example for the asymmetric synthesis of allenes by the Doering–LaFlamme allene synthesis with enantiopure cyclopropylmagnesium carbenoids. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.03.150] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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14
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Ishida N, Saitoh H, Sugiyama S, Satoh T. Synthesis of conjugated enynes from ketones and aldehydes by 1,2-CC insertion and 1,2-CH insertion of carbenoids as the key reactions. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.02.079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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15
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Satoh T, Awata Y, Kato Y, Ogata S, Ishigaki M, Sugiyama S, Saitoh H. Synthesis, including asymmetric synthesis, of 1-substituted cyclopentenes from cyclobutanones with one-carbon ring-expansion by 1,2-carbon-carbon insertion of magnesium carbenoids. Tetrahedron 2011. [DOI: 10.1016/j.tet.2010.12.023] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Watanabe H, Ogata S, Satoh T. A method for the synthesis of cyclopropanes by regiospecific and regioselective magnesium carbenoid 1,3-CH insertion as the key reactions. Tetrahedron 2010. [DOI: 10.1016/j.tet.2010.05.061] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Florio S, Luisi R. Aziridinyl Anions: Generation, Reactivity, and Use in Modern Synthetic Chemistry. Chem Rev 2010; 110:5128-57. [DOI: 10.1021/cr100032b] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Saverio Florio
- Dipartimento Farmaco-Chimico, Università di Bari, Consorzio Interuniversitario C.I.N.M.P.I.S., Via E. Orabona 4, I-70125 Bari, Italy
| | - Renzo Luisi
- Dipartimento Farmaco-Chimico, Università di Bari, Consorzio Interuniversitario C.I.N.M.P.I.S., Via E. Orabona 4, I-70125 Bari, Italy
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Satoh T, Ikeda S, Miyagawa T, Noguchi T. A short synthesis of 3-oxa- and 3-azabicyclo[3.1.0]hexanes from α,β-unsaturated esters based on the 1,5-CH insertion reaction of cyclopropylmagnesium carbenoids. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.02.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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19
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Asymmetric synthesis of bicyclo[n.1.0]alkanes by the enantioselective 1,3-CH insertion reaction of chiral magnesium carbenoids. ACTA ACUST UNITED AC 2010. [DOI: 10.1016/j.tetasy.2009.12.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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20
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A new synthesis, including asymmetric synthesis, of alkylidenecyclopropanes by 1,2-CC insertion of cyclobutylmagnesium carbenoides as the key reaction. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.04.038] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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21
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Satoh T, Awata Y, Ogata S, Sugiyama S, Tanaka M, Tori M. A synthesis of esters, amides, and sulfones bearing a 1-cyclopentenyl group at the α-position from cyclobutanones with one-carbon ring-expansion. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.02.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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22
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Yamashita H, Satoh T. A synthesis of di- and tri-substituted β,γ-unsaturated esters from aldehydes by the magnesium carbenoid 1,2-CH and 1,2-CC insertion as the key reaction. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.11.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Satoh T. Carbon Elongation of Carbonyl Compounds Utilizing the Rearrangement of Carbenoids-Recent Developments. J SYN ORG CHEM JPN 2009. [DOI: 10.5059/yukigoseikyokaishi.67.381] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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24
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Satoh T, Yamashita H, Musashi J. A new synthesis of β,γ-unsaturated esters from three components, aldehydes, chloromethyl p-tolyl sulfoxide, and tert-butyl acetate, via magnesium carbenoid 1,2-CH and 1,2-CC insertion as the key reaction. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.08.039] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Ogata S, Masaoka S, Sakai K, Satoh T. The first example of regiospecific magnesium carbenoid 1,3-CH insertion: its mechanism and stereochemistry. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.101] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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A short synthesis of highly substituted furans from alkenyl aryl ketones with dichloromethyl phenyl sulfoxide. Tetrahedron Lett 2007. [DOI: 10.1016/j.tetlet.2007.05.049] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Singh GS, D'hooghe M, De Kimpe N. Synthesis and Reactivity ofC-Heteroatom-Substituted Aziridines. Chem Rev 2007; 107:2080-135. [PMID: 17488062 DOI: 10.1021/cr0680033] [Citation(s) in RCA: 360] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Girija S Singh
- Chemistry Department, Faculty of Science, University of Botswana, Private Bag 0022, Gaborone, Botswana
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Sakurada J, Satoh T. Direct N- and C-alkenylation of nitrogen-containing heterocycles with magnesium alkylidene carbenoids. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.02.072] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Ila H, Baron O, Wagner AJ, Knochel P. Functionalized magnesium organometallics as versatile intermediates for the synthesis of polyfunctional heterocycles. Chem Commun (Camb) 2006:583-93. [PMID: 16446819 DOI: 10.1039/b510866g] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the last few years, we have demonstrated that the halogen/magnesium-exchange reaction is a unique method for preparing a variety of new functionalized aryl, alkenyl, heteroaryl magnesium compounds which has considerably extended the range of functionalized Grignard reagents available for synthetic purposes. A variety of functional groups such as an ester, nitrile, iodide, imine and even sensitive groups like nitro, hydroxyl and boronic ester can be tolerated in these organomagnesium compounds. We wish to describe the application of this halogen/magnesium-exchange reaction for the preparation of a broad range of five- and six-membered functionalized heteroaryl magnesium compounds and their reactions with various electrophiles providing a new entry to a range of polyfunctional heterocycles such as thiophene, furan, pyrrole, imidazole, thiazole, antipyrine, pyridine, quinoline and uracil derivatives.
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Affiliation(s)
- Hiriyakkanavar Ila
- Department of Chemistry, Indian Institute of Technology, Kanpur-208016, India
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Hitchcock PB, Rowlands GJ, Parmar R. The synthesis of enantiomerically pure 4-substituted [2.2]paracyclophane derivatives by sulfoxide-metal exchange. Chem Commun (Camb) 2005:4219-21. [PMID: 16100609 DOI: 10.1039/b507394d] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A general strategy for the synthesis of enantiomerically pure 4-substituted [2.2]paracyclophanes from a common sulfoxide precursor is described.
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Affiliation(s)
- Peter B Hitchcock
- Department of Chemistry, University of Sussex, Falmer, Brighton BN1 9QJ, UK
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Satoh T, Sakurada J, Ogino Y. A novel direct N-alkenylation of nitrogen-containing heterocycles with magnesium alkylidene carbenoids. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2005.05.058] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Satoh T, Fukuda Y. A new synthesis of enantiomerically pure α- and β-amino acid derivatives using aziridinyl anions. Tetrahedron 2003. [DOI: 10.1016/j.tet.2003.09.025] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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36
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Hayes JF, Prévost N, Prokes I, Shipman M, Slawin AMZ, Twin H. Aziridinyl anions from a chiral, nonracemic 2-isopropylidineaziridine: surprisingly diastereoselective alkylation reactions. Chem Commun (Camb) 2003:1344-5. [PMID: 12841233 DOI: 10.1039/b303252c] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Lithiation and alkylation of a 2-isopropylidineaziridine bearing an (S)-alpha-methylbenzyl group on nitrogen proceeds with high levels of diastereocontrol (80-90% de).
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Affiliation(s)
- J F Hayes
- GlaxoSmithKline, Old Powder Mills, Tonbridge, Kent, UK TN11 9AN
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Satoh T, Akita K. The first example of alpha-thiomagnesiums generated from dithioacetal monoxides with Grignard reagent; their properties and some synthetic applications. Chem Pharm Bull (Tokyo) 2003; 51:181-6. [PMID: 12576652 DOI: 10.1248/cpb.51.181] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Dithioacetal monoxides were synthesized from aldehydes and cyclohexanone, and reaction of the dithioacetal monoxides with Grignard reagents was investigated. The dithioacetal monoxide synthesized from alkylaldehyde and 4-chlorobenzenethiol reacted with i-PrMgCl to afford the desired alpha-thiomagnesium in high yield. The generated alpha-thiomagnesium was found to be stable at room temperature and to be useful in organic synthesis. In contrast to this, the dithioacetal monoxides derived from benzaldehyde and cyclohexanone did not give satisfactory results.
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Affiliation(s)
- Tsuyoshi Satoh
- Department of Chemistry, Faculty of Science, Tokyo University of Science, Japan
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