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Higham JI, Ma TK, Bull JA. When is an Imine Directing Group a Transient Imine Directing Group in C-H Functionalization? Chemistry 2024; 30:e202400345. [PMID: 38375941 DOI: 10.1002/chem.202400345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 02/19/2024] [Accepted: 02/20/2024] [Indexed: 02/21/2024]
Abstract
'Transient' C-H functionalization has emerged in recent years to describe the use of a dynamic linkage, often an imine, to direct cyclometallation and subsequent functionalization. As the field continues to grow in popularity, we consider the features that make an imine directing group transient. A transient imine should be i) formed dynamically in situ, ii) avoid discrete introduction or cleavage steps, and iii) offer the potential for catalysis in both the directing group and metal. This concept article contrasts transient imines with pioneering early studies of imines as directing groups for the formation of metallacycles and the use of preformed imines in C-H functionalization. Leading developments in the use of catalytic additives to form transient directing groups (as aldehyde or amine) are covered including selected highlights of the most recent examples of catalytic imine directed C-H functionalization with transition metals.
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Affiliation(s)
- Joe I Higham
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London, W12 0BZ, UK
| | - Tsz-Kan Ma
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London, W12 0BZ, UK
| | - James A Bull
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London, W12 0BZ, UK
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Russo C, Leech MC, Walsh JM, Higham JI, Giannessi L, Lambert E, Kiaku C, Poole DL, Mason J, Goodall CAI, Devo P, Giustiniano M, Radi M, Lam K. eHydrogenation: Hydrogen-free Electrochemical Hydrogenation. Angew Chem Int Ed Engl 2023; 62:e202309563. [PMID: 37540528 DOI: 10.1002/anie.202309563] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 08/03/2023] [Accepted: 08/04/2023] [Indexed: 08/05/2023]
Abstract
Hydrogenation reactions are staple transformations commonly used across scientific fields to synthesise pharmaceuticals, natural products, and various functional materials. However, the vast majority of these reactions require the use of a toxic and costly catalyst leading to unpractical, hazardous and often functionally limited conditions. Herein, we report a new, general, practical, efficient, mild and high-yielding hydrogen-free electrochemical method for the reduction of alkene, alkyne, nitro and azido groups. Finally, this method has been applied to deuterium labelling.
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Affiliation(s)
- Camilla Russo
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
- Department of Pharmacy, University of Naples Federico II, Via D. Montesano 49, 80131, Napoli, Italy
| | - Matthew C Leech
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Jamie M Walsh
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Joe I Higham
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Lisa Giannessi
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
- Department of Food and Drug, University of Parma Parco area delle, Scienze 27°, Parma, Italy
| | - Emmanuelle Lambert
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Cyrille Kiaku
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Darren L Poole
- Discovery High-Throughput Chemistry, Medicinal Chemistry, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK
| | - Joseph Mason
- Discovery High-Throughput Chemistry, Medicinal Chemistry, GSK Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire, SG1 2NY, UK
| | - Charles A I Goodall
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Perry Devo
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
| | - Mariateresa Giustiniano
- Department of Pharmacy, University of Naples Federico II, Via D. Montesano 49, 80131, Napoli, Italy
| | - Marco Radi
- Department of Food and Drug, University of Parma Parco area delle, Scienze 27°, Parma, Italy
| | - Kevin Lam
- School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Chatham, Kent, ME4 4TB, UK
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Higham JI, Ma TK, Bull JA. Dual Copper- and Aldehyde-Catalyzed Transient C-H Sulfonylation of Benzylamines. Org Lett 2023. [PMID: 37439636 PMCID: PMC10367073 DOI: 10.1021/acs.orglett.3c01783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
This study reports the first example of using a dual catalytic system with copper(II) acetate and 2-hydroxynicotinaldehyde to achieve transient C(sp2)-H sulfonylation of benzylamines with sulfinate salts via a dynamically formed imine directing group. Manganese(IV) oxide was identified as an effective oxidant and base. Computational density functional theory investigations suggest that the transient directing group lowers the energy barrier for an acetate-mediated, turnover-limiting C-H activation step and subsequent combination of the cupracycle with a RSO2 radical.
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Affiliation(s)
- Joe I Higham
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, United Kingdom
| | - Tsz-Kan Ma
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, United Kingdom
| | - James A Bull
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, United Kingdom
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Higham JI, Bull JA. Amine-Catalyzed Copper-Mediated C-H Sulfonylation of Benzaldehydes via a Transient Imine Directing Group. Angew Chem Int Ed Engl 2022; 61:e202202933. [PMID: 35441781 PMCID: PMC9321081 DOI: 10.1002/anie.202202933] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Indexed: 12/28/2022]
Abstract
Transient directing groups (TDGs) can provide a powerful means for C−H functionalization without requiring additional steps for directing group introduction and removal. We report the first use of a TDG in combination with copper to effect C−H functionalization. The regioselective copper mediated β−C(sp2)−H sulfonylation of aldehydes with sulfinate salts is accomplished using catalytic β‐alanine to form a transient imine. A broad range of sulfonylated benzaldehydes are prepared using copper fluoride as both copper source and oxidant, involving a [5,6] cupracyclic intermediate. γ‐(peri)‐Sulfonylation of napthyl and phenanthrenyl carboxaldehydes is achieved through [6,6] cupracyclic intermediates. Further derivatisation of the aldehyde products is demonstrated. Kinetic experiments and Hammett analysis suggest the turnover limiting step to be a concerted asynchronous C−H cleavage via a dearomative Wheland‐type transition state.
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Affiliation(s)
- Joe I Higham
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London, W12 0BZ, UK
| | - James A Bull
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London, W12 0BZ, UK
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Piticari A, Antermite D, Higham JI, Moore JH, Webster MP, Bull JA. Stereoselective Palladium‐Catalyzed C(
sp
3
)−H Mono‐Arylation of Piperidines and Tetrahydropyrans with a C(4) Directing Group. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Amalia‐Sofia Piticari
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | - Daniele Antermite
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | - Joe I. Higham
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | - J. Harry Moore
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
| | | | - James A. Bull
- Department of Chemistry Imperial College London Molecular Sciences Research Hub White City Campus Wood Lane London W12 0BZ UK
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Higham JI, Bull JA. Copper catalysed oxidative α-sulfonylation of branched aldehydes using the acid enhanced reactivity of manganese(iv) oxide. Chem Commun (Camb) 2020; 56:4587-4590. [PMID: 32207485 DOI: 10.1039/d0cc01576h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The oxidative coupling of secondary aldehydes and sulfinate salts is achieved using copper catalysis to form α-sulfonyl aldehydes. The use of an acidic co-solvent is important to adjust the oxidation potential of MnO2 as an oxidant. A broad range of sulfonylated aldehydes is prepared, and their further functionalisation is demonstrated. A dual ionic/radical pathway mechanism is proposed.
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Affiliation(s)
- Joe I Higham
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, UK.
| | - James A Bull
- Department of Chemistry, Imperial College London, Molecular Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, UK.
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Gibson SM, D'Oyley JM, Higham JI, Sanders K, Laserna V, Aliev AE, Sheppard TD. Dihalohydration of Alkynols: A Versatile Approach to Diverse Halogenated Molecules. European J Org Chem 2018; 2018:4018-4028. [PMID: 30147439 PMCID: PMC6099344 DOI: 10.1002/ejoc.201800668] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Indexed: 11/28/2022]
Abstract
In this paper we outline how dihalohydration reactions of propargylic alcohols can be used to access a wide variety of useful halogenated building blocks. A novel procedure for dibromohydration of alkynes has been developed, and a selection of dichloro and dibromo diols and cyclic ethers were synthesized. The dihalohydration of homo-propargylic alcohols provides a useful route to 3-halofurans, which were shown to readily undergo cycloaddition reactions under mild conditions. Finally, a novel ring expansion of propargylic alcohols containing a cyclopropylalkyne provides access to halogenated alkenylcyclobutanes.
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Affiliation(s)
- Samantha M. Gibson
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
| | - Jarryl M. D'Oyley
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
| | - Joe I. Higham
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
| | - Kate Sanders
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
| | - Victor Laserna
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
| | - Abil E. Aliev
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
| | - Tom D. Sheppard
- Christopher Ingold LaboratoriesUniversity College London20 Gordon St, LondonWC1H 0AJUK
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