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Anderson JM, Poole DL, Cook GC, Murphy JA, Measom ND. Organometallic Bridge Diversification of Bicyclo[1.1.1]pentanes. Chemistry 2024; 30:e202304070. [PMID: 38117748 DOI: 10.1002/chem.202304070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 12/19/2023] [Accepted: 12/19/2023] [Indexed: 12/22/2023]
Abstract
Bicyclo[1.1.1]pentane (BCP) derivatives have attracted significant recent interest in drug discovery as alkyne, tert-butyl and arene bioisosteres, where their incorporation is frequently associated with increased compound solubility and metabolic stability. While strategies for functionalisation of the bridgehead (1,3) positions are extensively developed, platforms allowing divergent substitution at the bridge (2,4,5) positions remain limited. Recent reports have introduced 1-electron strategies for arylation and incorporation of a small range of other substituents, but are limited in terms of scope, yields or practical complexity. Herein, we show the synthesis of diverse 1,2,3-trifunctionalised BCPs through lithium-halogen exchange of a readily accessible BCP bromide. When coupled with medicinally relevant product derivatisations, our developed 2-electron "late stage" approach provides rapid and straightforward access to unprecedented BCP structural diversity (>20 hitherto-unknown motifs reported). Additionally, we describe a method for the synthesis of enantioenriched "chiral-at-BCP" bicyclo[1.1.1]pentanes through a novel stereoselective bridgehead desymmetrisation.
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Affiliation(s)
- Joseph M Anderson
- Medicinal Chemistry, GSK, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, UK, SG1 2NY
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, UK, G1 1XL
| | - Darren L Poole
- Medicinal Chemistry, GSK, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, UK, SG1 2NY
| | - Gemma C Cook
- Medicinal Chemistry, GSK, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, UK, SG1 2NY
| | - John A Murphy
- Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow, UK, G1 1XL
| | - Nicholas D Measom
- Medicinal Chemistry, GSK, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, UK, SG1 2NY
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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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3
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Ielo L, Touqeer S, Roller A, Langer T, Holzer W, Pace V. Telescoped, Divergent, Chemoselective C1 and C1-C1 Homologation of Imine Surrogates: Access to Quaternary Chloro- and Halomethyl-Trifluoromethyl Aziridines. Angew Chem Int Ed Engl 2019; 58:2479-2484. [PMID: 30548145 PMCID: PMC6582437 DOI: 10.1002/anie.201812525] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Indexed: 12/30/2022]
Abstract
A conceptually novel, high‐yielding, mono‐ or bis‐homologation was realized with lithium halocarbenoids and enables the one‐step, fully chemocontrolled assembly of a new class of quaternary trifluoromethyl aziridines. Trifluoroacetimidoyl chlorides (TFAICs) act as convenient electrophilic platforms, enabling the addition of either one or two homologating elements by simply controlling the stoichiometry of the process. Mechanistic studies highlighted that the homologation event, carried out with two different carbenoids (LiCH2Cl and LiCH2F), leads to fluoromethyl analogues in which the first nucleophile is employed for constructing the cycle and the second for decorating the resulting molecular architecture.
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Affiliation(s)
- Laura Ielo
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria
| | - Saad Touqeer
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria
| | - Alexander Roller
- University of Vienna, X-Ray Structure Analysis Center, Waehringerstrasse 42, 1090, Vienna, Austria
| | - Thierry Langer
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria
| | - Wolfgang Holzer
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria
| | - Vittorio Pace
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, 1090, Vienna, Austria
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4
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Marcantoni E, Palmieri A, Petrini M. Recent synthetic applications of α-amido sulfones as precursors of N-acylimino derivatives. Org Chem Front 2019. [DOI: 10.1039/c9qo00196d] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
α-Amido sulfones can be directly used as N-acylimine or N-acyliminium ion precursors in several synthetic processes aimed at the preparation of nitrogen containing compounds. This review collects the most relevant and practical utilizations of α-amido sulfones appeared in the literature after 2005.
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Affiliation(s)
- Enrico Marcantoni
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Alessandro Palmieri
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
| | - Marino Petrini
- School of Science and Technology
- Chemistry Division
- University of Camerino
- 1 I-62032 Camerino
- Italy
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5
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Singh GS. Advances in synthesis and chemistry of aziridines. ADVANCES IN HETEROCYCLIC CHEMISTRY 2019. [DOI: 10.1016/bs.aihch.2018.12.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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6
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Aghahosseini H, Ramazani A, Jalayer NS, Ranjdoost Z, Souldozi A, Ślepokura K, Lis T. Vinylphosphonium Salt-Mediated Reactions: A One-Pot Condensation Approach for the Highly cis-Selective Synthesis of N-Benzoylaziridines and the Green Synthesis of 1,4,2-Dioxazoles as Two Important Classes of Heterocyclic Compounds. Org Lett 2018; 21:22-26. [PMID: 30565459 DOI: 10.1021/acs.orglett.8b03388] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
An efficient, one-pot, and convenient approach for the reaction of the same precursors, trialkyl(aryl) phosphines, acetylene diesters, and benzhydroxamic acids has been developed to produce two important classes of heterocyclic compounds: N-benzoylaziridines and 1,4,2-dioxazoles. The strategy utilizes the intermediate solvation as a key step in product selectivity. The usefulness of the developed approach has been confirmed in the unprecedented highly cis-selective formation of the N-benzoylaziridines. In addition, the procedure provides a green alternative method for the synthesis of 1,4,2-dioxazoles employing a β-cyclodextrin nanoreactor in aqueous media.
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Affiliation(s)
- Hamideh Aghahosseini
- Department of Chemistry , University of Zanjan , P.O. Box 45195-313, Zanjan , Iran
| | - Ali Ramazani
- Department of Chemistry , University of Zanjan , P.O. Box 45195-313, Zanjan , Iran
| | | | - Zahra Ranjdoost
- Department of Chemistry , University of Zanjan , P.O. Box 45195-313, Zanjan , Iran
| | - Ali Souldozi
- Department of Chemistry, Urmia Branch , Islamic Azad University , Urmia , Iran
| | - Katarzyna Ślepokura
- Faculty of Chemistry , University of Wrocław , 14 Joliot-Curie St ., 50-383 Wrocław , Poland
| | - Tadeusz Lis
- Faculty of Chemistry , University of Wrocław , 14 Joliot-Curie St ., 50-383 Wrocław , Poland
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7
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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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8
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Pace V, Monticelli S, de la Vega-Hernández K, Castoldi L. Isocyanates and isothiocyanates as versatile platforms for accessing (thio)amide-type compounds. Org Biomol Chem 2018; 14:7848-54. [PMID: 27461156 DOI: 10.1039/c6ob00766j] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The addition of carbon (Grignard and organolithium reagents) and hydride nucleophiles (Schwartz reagent) to isocyanates and isothiocyanates constitutes a versatile, direct and high yielding approach to the synthesis of functionalized (thio)amide derivatives including haloamides and formamides. The chemoselective delivery of a nucleophilic (eventually configurationally stable) organometallic species to a given iso(thio)cyanate is the crucial parameter for the success of the strategy. Thus, the influence of the factors governing classical methodologies (e.g. dehydrative condensation) such as steric hindrance and electronic properties of the reactants become practically negligible.
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Affiliation(s)
- Vittorio Pace
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Serena Monticelli
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Karen de la Vega-Hernández
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
| | - Laura Castoldi
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse, 14, A-1090, Vienna, Austria.
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9
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Affiliation(s)
- Shekh Sabir
- Department of Applied Chemistry; BabaSaheb Bhimrao Ambedkar University (A Central University) Vidya Vihar; Raebareli Road Lucknow 226025 India
| | | | - Jawahar L. Jat
- Department of Applied Chemistry; BabaSaheb Bhimrao Ambedkar University (A Central University) Vidya Vihar; Raebareli Road Lucknow 226025 India
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10
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Pace V, Holzer W, De Kimpe N. Lithium Halomethylcarbenoids: Preparation and Use in the Homologation of Carbon Electrophiles. CHEM REC 2016; 16:2061-76. [PMID: 27381551 DOI: 10.1002/tcr.201600011] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Indexed: 11/06/2022]
Abstract
α-Halomethyllithium carbenoids are useful homologating reagents which - reacting under proper reaction conditions as carbanions - enable the installation via nucleophilic addition of a reactive halomethyl fragment onto a preformed carbon-heteroatom bond. The pronounced thermolability represented - since seminal studies by Köbrich - the Achilles' heel of these reagents: the use of Barbier-type methodologies (i.e., the electrophile should be present in the reaction mixture prior to the formation of the carbenoid) was pivotal in order to suppress decomposition through α-elimination processes. Nowadays, the use of low temperatures (-78 °C) guarantees reliable procedures and, significantly, the employment of microreactor technologies allows external trapping to be performed even at higher temperatures as reported by Luisi. We will discuss the α-halomethyllithium-mediated homologations of a series of carbon electrophiles such as carbonyl compounds, imines, esters, Weinreb amides, and isocyanates.
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Affiliation(s)
- Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - Wolfgang Holzer
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090, Vienna, Austria
| | - Norbert De Kimpe
- Department of Sustainable Organic Chemistry and Technology, Faculty of Bioscience Engineering Ghent University, Coupure Links 653, B-9000, Ghent, Belgium
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11
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Pace V, Castoldi L, Mamuye AD, Langer T, Holzer W. Chemoselective Addition of Halomethyllithiums to Functionalized Isatins:A Straightforward Access to Spiro‐Epoxyoxindoles. Adv Synth Catal 2016. [DOI: 10.1002/adsc.201500840] [Citation(s) in RCA: 43] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Vittorio Pace
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse 14, A‐1090 Vienna, Austria
| | - Laura Castoldi
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse 14, A‐1090 Vienna, Austria
| | - Ashenafi Damtew Mamuye
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse 14, A‐1090 Vienna, Austria
- University of Sassari, Department of Chemistry and Pharmacy, Via Vienna 2, I‐07100 Sassari, Italy
| | - Thierry Langer
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse 14, A‐1090 Vienna, Austria
| | - Wolfgang Holzer
- University of Vienna, Department of Pharmaceutical Chemistry, Althanstrasse 14, A‐1090 Vienna, Austria
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12
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Huang ZA, Liu H, Lu CD, Xu YJ. Stereoselective Synthesis of Enantioenriched 2-Chloro-2-aroylaziridines by Cascade Reaction between Aryl Nitriles, Silyldichloromethanes, and tert-Butanesulfinylimines. Org Lett 2015; 17:4042-5. [PMID: 26226516 DOI: 10.1021/acs.orglett.5b01954] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The cascade coupling of aryl nitriles, silyldichloromethanes, and tert-butanesulfinylimines is described, in which silyldichloromethyllithiums, generated from silyldichloromethanes in the presence of lithium diisopropylamide, undergo nucleophilic addition with aryl nitriles and subsequent [1,3]-aza-Brook rearrangement to give dichlorocarbanions bearing α-N-silyl imine (or their 1-azaenolate equivalents), which are then trapped by tert-butanesulfinylimines via an aza-Darzens-type transformation, affording enantioenriched 2-chloro-2-aroylaziridines after acidic hydrolysis of the N-silyl imine group. The stereochemistry of this cascade reaction can be tuned by selecting appropriate silyl groups on the silyldichloromethanes and altering the order of addition of the imines and the hexamethylphosphoramide additive.
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Affiliation(s)
| | | | - Chong-Dao Lu
- ‡Department of Chemistry and Applied Chemistry, Changji University, Changji 831100, China
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13
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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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14
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Morgan KF, Hollingsworth IA, Bull JA. Studies on the synthesis, stability and conformation of 2-sulfonyl-oxetane fragments. Org Biomol Chem 2015; 13:5265-72. [DOI: 10.1039/c5ob00549c] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A library of 2-sulfonyl oxetane fragments has been synthesised and elaborated into lead-like compounds. The oxetane derivatives were stable to acidic and basic conditions and have 3-preferred conformations.
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Affiliation(s)
- K. F. Morgan
- Department of Chemistry Imperial College London
- London SW7 2AZ
- UK
| | | | - J. A. Bull
- Department of Chemistry Imperial College London
- London SW7 2AZ
- UK
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15
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Degennaro L, Fanelli F, Giovine A, Luisi R. External Trapping of Halomethyllithium Enabled by Flow Microreactors. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400747] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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16
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Boyer A. Rhodium(II)-Catalyzed Stereocontrolled Synthesis of 2-Tetrasubstituted Saturated Heterocycles from 1-Sulfonyl-1,2,3-triazoles. Org Lett 2014; 16:5878-81. [DOI: 10.1021/ol5028267] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alistair Boyer
- School of Chemistry, University of Glasgow, Joseph Black
Building, University Avenue, Glasgow G12 8QQ, U.K
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17
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Boultwood T, Affron DP, Bull JA. Synthesis and purification of iodoaziridines involving quantitative selection of the optimal stationary phase for chromatography. J Vis Exp 2014. [PMID: 24893769 DOI: 10.3791/51633] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
The highly diastereoselective preparation of cis-N-Ts-iodoaziridines through reaction of diiodomethyllithium with N-Ts aldimines is described. Diiodomethyllithium is prepared by the deprotonation of diiodomethane with LiHMDS, in a THF/diethyl ether mixture, at -78 °C in the dark. These conditions are essential for the stability of the LiCHI2 reagent generated. The subsequent dropwise addition of N-Ts aldimines to the preformed diiodomethyllithium solution affords an amino-diiodide intermediate, which is not isolated. Rapid warming of the reaction mixture to 0 °C promotes cyclization to afford iodoaziridines with exclusive cis-diastereoselectivity. The addition and cyclization stages of the reaction are mediated in one reaction flask by careful temperature control. Due to the sensitivity of the iodoaziridines to purification, assessment of suitable methods of purification is required. A protocol to assess the stability of sensitive compounds to stationary phases for column chromatography is described. This method is suitable to apply to new iodoaziridines, or other potentially sensitive novel compounds. Consequently this method may find application in range of synthetic projects. The procedure involves firstly the assessment of the reaction yield, prior to purification, by (1)H NMR spectroscopy with comparison to an internal standard. Portions of impure product mixture are then exposed to slurries of various stationary phases appropriate for chromatography, in a solvent system suitable as the eluent in flash chromatography. After stirring for 30 min to mimic chromatography, followed by filtering, the samples are analyzed by (1)H NMR spectroscopy. Calculated yields for each stationary phase are then compared to that initially obtained from the crude reaction mixture. The results obtained provide a quantitative assessment of the stability of the compound to the different stationary phases; hence the optimal can be selected. The choice of basic alumina, modified to activity IV, as a suitable stationary phase has allowed isolation of certain iodoaziridines in excellent yield and purity.
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Affiliation(s)
| | | | - James A Bull
- Department of Chemistry, Imperial College London;
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18
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Degennaro L, Trinchera P, Luisi R. Recent advances in the stereoselective synthesis of aziridines. Chem Rev 2014; 114:7881-929. [PMID: 24823261 DOI: 10.1021/cr400553c] [Citation(s) in RCA: 326] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Leonardo Degennaro
- Department of Pharmacy-Drug Sciences, University of Bari "A. Moro" , Via Edoardo Orabona 4, Bari 70125, Italy
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19
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Gopi E, Namboothiri INN. Synthesis of α-tribromomethylamines via Mg-mediated addition of bromoform to imines. Org Biomol Chem 2014; 12:2769-77. [PMID: 24668340 DOI: 10.1039/c4ob00259h] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Mg-mediated addition of bromoform to electron deficient imines such as N-sulfonylimines affords α-tribromomethylated N-sulfonylamines in good to excellent yields. The procedure could be further simplified by transforming the imine precursors, α-sulfonyl-N-tosyl- and Boc-amines, in one pot to the corresponding α-tribromomethyl derivatives. Facile removal of the Boc protecting group in nearly quantitative yield and a silver carbonate mediated monodebromination have also been demonstrated.
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Affiliation(s)
- Elumalai Gopi
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai 400 076, India.
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20
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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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21
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Boyer A. Rhodium(II)-Catalyzed Stereocontrolled Synthesis of Dihydrofuran-3-imines from 1-Tosyl-1,2,3-triazoles. Org Lett 2014; 16:1660-3. [DOI: 10.1021/ol500309x] [Citation(s) in RCA: 83] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Alistair Boyer
- School of Chemistry, University of Glasgow, Joseph Black
Building, University Avenue, Glasgow G12 8QQ, U.K
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22
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Li D, Li Y, Chen Z, Shang H, Li H, Ren X. Stereoselective synthesis of α-(dichloromethyl)-amines, α-(chloromethyl)amines, and α-chloro-aziridines. RSC Adv 2014. [DOI: 10.1039/c4ra00471j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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