1
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Nucleophilic Arylation of Halopurines Facilitated by Brønsted Acid in Fluoroalcohol. MOLECULES (BASEL, SWITZERLAND) 2019; 24:molecules24213812. [PMID: 31652675 PMCID: PMC6865213 DOI: 10.3390/molecules24213812] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/08/2019] [Revised: 10/18/2019] [Accepted: 10/21/2019] [Indexed: 12/01/2022]
Abstract
Various aryl-substituted purine derivatives were synthesized through the direct arylation of halopurines with aromatic compounds, facilitated by the combination of triflic acid and fluoroalcohol. This metal-free method is complementary to conventional coupling reactions using metal catalysts and reagents for the syntheses of aryl-substituted purine analogues.
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2
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Wagschal S, Perego LA, Simon A, Franco-Espejo A, Tocqueville C, Albaneze-Walker J, Jutand A, Grimaud L. Formation of XPhos-Ligated Palladium(0) Complexes and Reactivity in Oxidative Additions. Chemistry 2019; 25:6980-6987. [PMID: 30920694 DOI: 10.1002/chem.201900451] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2019] [Indexed: 12/17/2022]
Abstract
Understanding the nature of the intermediate species operating within a palladium catalytic cycle is crucial for developing efficient cross-coupling reactions. Even though the XPhos/Pd(OAc)2 catalytic system has found numerous applications, the nature of the active catalytic species remains elusive. A Pd0 complex ligated to XPhos has been detected and characterized in situ for the first time using cyclic voltammetry and NMR techniques. In the presence of XPhos, Pd(OAc)2 initially associates with the ligand to form a complex in solution, which has been characterized as PdII (OAc)2 (XPhos). This PdII center is then reduced to the Pd0 (XPhos)2 species by an intramolecular process. This study also sheds light on the formation of PdI -PdI dimers. Finally, a kinetic study probes a dissociative mechanism for the oxidative addition with aryl halides involving Pd0 (XPhos) as the reactive species in equilibrium with the unreactive Pd0 (XPhos)2 . Remarkably, the reportedly poorly reactive PhCl reacts at room temperature in the oxidative addition, which confirms the crucial role of the XPhos ligand in the activation of aryl chlorides.
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Affiliation(s)
- Simon Wagschal
- Discovery Product Development and Supply, Janssen Pharmaceutica, Hochstrasse 201, 8200, Schaffhausen, Switzerland
| | - Luca Alessandro Perego
- PASTEUR, Département de Chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France
| | - Alexandre Simon
- PASTEUR, Département de Chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France
| | - Aida Franco-Espejo
- PASTEUR, Département de Chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France
| | - Chanelle Tocqueville
- PASTEUR, Département de Chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France
| | - Jennifer Albaneze-Walker
- Discovery Product Development and Supply, Janssen Pharmaceutica, Turnhoutseweg 30, 2340, Beerse, Belgium
| | - Anny Jutand
- PASTEUR, Département de Chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France
| | - Laurence Grimaud
- PASTEUR, Département de Chimie, École normale supérieure, PSL University, Sorbonne Université, CNRS, 75005, Paris, France
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3
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Scott NWJ, Ford MJ, Schotes C, Parker RR, Whitwood AC, Fairlamb IJS. The ubiquitous cross-coupling catalyst system ‘Pd(OAc)2’/2PPh3 forms a unique dinuclear PdI complex: an important entry point into catalytically competent cyclic Pd3 clusters. Chem Sci 2019. [DOI: 10.1039/c9sc01847f] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Pd3-type clusters generated from Pd(OAc)2/nPPh3, formed via a dinuclear Pd(i) species, exhibit high activity in Suzuki–Miyaura cross-coupling.
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Affiliation(s)
| | - Mark J. Ford
- Bayer Aktiengesellschaft
- Crop Science Division
- 65926 Frankfurt am Main
- Germany
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4
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Ardhapure AV, Sanghvi YS, Borozdina Y, Kapdi AR, Schulzke C. Crystal structure of 8-(4-methyl-phen-yl)-2'-de-oxy-adenosine hemihydrate. Acta Crystallogr E Crystallogr Commun 2018; 74:1-5. [PMID: 29416880 PMCID: PMC5778474 DOI: 10.1107/s2056989017017212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2017] [Accepted: 11/30/2017] [Indexed: 11/23/2022]
Abstract
In the asymmetric unit, equalling the unit cell (triclinic, P1, Z = 1), two mol-ecules of the title compound, 8-(4-methyl-phen-yl)-d-2'-de-oxy-adenosine, C17H19N5O3, are present, with distinct conformations of the two sugar moieties, together with one solvent water mol-ecule. All three ribose O atoms are involved in hydrogen bonding and the crystal packing is largely determined by hydrogen-bonding or hydrogen-heteroatom inter-actions (O-H⋯O, O-H⋯N, N-H⋯O, C-H⋯O and C-H⋯N) with one independent mol-ecule directly linked to four neighbouring mol-ecules and the other mol-ecule directly linked to six neighbouring mol-ecules. The two independent mol-ecules of the asymmetric unit display three weak intra-molecular C-H-to-heteroatom contacts, two of which are very similar despite the different conformations of the deoxyribosyl moieties. The aromatic ring systems of both mol-ecules are in proximity to each other and somehow aligned, though not coplanar. The absolute structures of the two mol-ecules were assumed with reference to the reactant 8-bromo-d-2'-de-oxy-adenosine as they could not be determined crystallographically.
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Affiliation(s)
- Ajaykumar V. Ardhapure
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400 019, India
| | - Yogesh S. Sanghvi
- Rasayan Inc. 2802, Crystal Ridge Road, Encinitas, California 92024-6615, USA
| | - Yulia Borozdina
- Max Planck Institute for Biological Cybernetics Spemannstrasse 41, D-72076 Tübingen, Germany
| | - Anant Ramakant Kapdi
- Department of Chemistry, Institute of Chemical Technology, Nathalal Parekh Road, Matunga, Mumbai 400 019, India
| | - Carola Schulzke
- Institut für Biochemie, Ernst-Moritz-Arndt Universität Greifswald, Felix-Hausdorff-Strasse 4, D-17487 Greifswald, Germany
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5
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Kumar R, Asthana M, Singh RM. Pd-Catalyzed One-Pot Stepwise Synthesis of Benzo[b][1,6]naphthyridines from 2-Chloroquinoline-3-carbonitriles Using Sulfur and Amines As Nucleophiles. J Org Chem 2017; 82:11531-11542. [PMID: 28980473 DOI: 10.1021/acs.joc.7b02147] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A palladium-catalyzed one-pot stepwise coupling-annulation reaction of 2-chloroqunoline-3-carbonitriles enabled the direct synthesis of sulfur-substituted benzo[b][1,6]naphthyridines via multiple bond formation. The reaction provided an unusual mode for cyclization as sodium sulfide, a soft nucleophile, preferred to attack on the carbon of the nitrile group rather than on the C-C triple bond. The developed chemistry was extended with the secondary amines as nucleophiles to afford nitrogen-substituted benzo[b][1,6]naphythyridines while primary amines afforded hydroamination products . The hydromination products were transformed to benzo[b][1,6]naphthyridones via a base-mediated cyclization reaction. The developed protocol features inexpensive and easily synthesizable starting materials, easy operations, and a high efficiency and tolerance to a broad range of substrates.
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Affiliation(s)
- Ritush Kumar
- Department of Chemistry, Indian Institute of Technology Guwahati , Assam-781039, India.,Department of Chemistry, Institute of Science, Centre of Advanced Study, Banaras Hindu University , Varanasi-221005, India
| | - Mrityunjaya Asthana
- Department of Chemistry, Indian Institute of Technology Guwahati , Assam-781039, India
| | - Radhey M Singh
- Department of Chemistry, Institute of Science, Centre of Advanced Study, Banaras Hindu University , Varanasi-221005, India
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6
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Reay AJ, Hammarback LA, Bray JTW, Sheridan T, Turnbull D, Whitwood AC, Fairlamb IJS. Mild and Regioselective Pd(OAc) 2-Catalyzed C-H Arylation of Tryptophans by [ArN 2]X, Promoted by Tosic Acid. ACS Catal 2017; 7:5174-5179. [PMID: 28824821 PMCID: PMC5557615 DOI: 10.1021/acscatal.6b03121] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Revised: 06/10/2017] [Indexed: 01/08/2023]
Abstract
![]()
A regioselective
Pd-mediated C–H bond arylation methodology
for tryptophans, utilizing stable aryldiazonium salts, affords C2-arylated
tryptophan derivatives, in several cases quantitatively. The reactions
proceed in air, without base, and at room temperature in EtOAc. The
synthetic methodology has been evaluated and compared against other
tryptophan derivative arylation methods using the CHEM21 green chemistry
toolkit. The behavior of the Pd catalyst species has been probed in
preliminary mechanistic studies, which indicate that the reaction
is operating homogeneously, although Pd nanoparticles are formed during
substrate turnover. The effects of these higher order Pd species on
catalysis, under the reaction conditions examined, appear to be minimal:
e.g., acting as a Pd reservoir in the latter stages of substrate turnover
or as a moribund form (derived from catalyst deactivation). We have
determined that TsOH shortens the induction period observed when [ArN2]BF4 salts are employed with Pd(OAc)2. Pd(OTs)2(MeCN)2 was found to be a superior
precatalyst (confirmed by kinetic studies) in comparison to Pd(OAc)2.
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Affiliation(s)
- Alan J. Reay
- Department of Chemistry, University of York, York YO10 5DD, U.K
| | | | | | - Thomas Sheridan
- Department of Chemistry, University of York, York YO10 5DD, U.K
| | - David Turnbull
- Department of Chemistry, University of York, York YO10 5DD, U.K
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7
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Danodia AK, Saunthwal RK, Patel M, Tiwari RK, Verma AK. Pd-catalyzed one-pot sequential unsymmetrical cross-coupling reactions of aryl/heteroaryl 1,2-dihalides. Org Biomol Chem 2016; 14:6487-96. [DOI: 10.1039/c6ob01049k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present methodology allows the conversion of easily available aryl/heteroaryl 1,2-dihalides into synthetically useful unsymmetrically substituted arenes/heteroarenes in good to excellent yields under mild reaction conditions.
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Affiliation(s)
- Abhinandan K. Danodia
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi 110007
- India
| | - Rakesh K. Saunthwal
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi 110007
- India
| | - Monika Patel
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi 110007
- India
| | - Rakesh K. Tiwari
- Chapman University School of Pharmacy
- Harry and Diane Rinker Health Science Campus
- Irvine
- USA
| | - Akhilesh K. Verma
- Synthetic Organic Chemistry Research Laboratory
- Department of Chemistry
- University of Delhi
- Delhi 110007
- India
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8
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Klečka M, Poštová Slavětínská L, Hocek M. Modification of Pyrrolo[2,3-d]pyrimidines by C-H Borylation Followed by Cross-Coupling or Other Transformations: Synthesis of 6,8-Disubstituted 7-Deazapurine Bases. European J Org Chem 2015. [DOI: 10.1002/ejoc.201501177] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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9
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Efficient functionalization of 2-amino-6-chloropurine derivatives at C-8 via 8-lithiated species. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.09.028] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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10
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Takfaoui A, Touzani R, Soulé JF, Dixneuf PH, Doucet H. Palladium-Catalysed Direct Arylation using Free-Amine-Substituted Polyfluoroanilines with Inhibition of Amination-Type Reaction. ASIAN J ORG CHEM 2015. [DOI: 10.1002/ajoc.201500268] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Abdelilah Takfaoui
- Institut Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1, “Organométalliques, Matériaux et Catalyse”; Campus de Beaulieu 35042 Rennes France
- Laboratoire de Chimie Appliquée et Environnement (LCAE-URAC18); Faculté des Sciences, Université Mohamed Premier, Oujda, and Faculté Pluridisciplinaire de Nador; Université Mohammed Premier; BP: 300, Selouane 62700 Nador Morocco
| | - Rachid Touzani
- Laboratoire de Chimie Appliquée et Environnement (LCAE-URAC18); Faculté des Sciences, Université Mohamed Premier, Oujda, and Faculté Pluridisciplinaire de Nador; Université Mohammed Premier; BP: 300, Selouane 62700 Nador Morocco
| | - Jean-François Soulé
- Institut Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1, “Organométalliques, Matériaux et Catalyse”; Campus de Beaulieu 35042 Rennes France
| | - Pierre H. Dixneuf
- Institut Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1, “Organométalliques, Matériaux et Catalyse”; Campus de Beaulieu 35042 Rennes France
| | - Henri Doucet
- Institut Sciences Chimiques de Rennes; UMR 6226 CNRS-Université de Rennes 1, “Organométalliques, Matériaux et Catalyse”; Campus de Beaulieu 35042 Rennes France
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11
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Shaughnessy KH. Palladium-catalyzed modification of unprotected nucleosides, nucleotides, and oligonucleotides. Molecules 2015; 20:9419-54. [PMID: 26007192 PMCID: PMC6272472 DOI: 10.3390/molecules20059419] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Revised: 05/15/2015] [Accepted: 05/19/2015] [Indexed: 11/30/2022] Open
Abstract
Synthetic modification of nucleoside structures provides access to molecules of interest as pharmaceuticals, biochemical probes, and models to study diseases. Covalent modification of the purine and pyrimidine bases is an important strategy for the synthesis of these adducts. Palladium-catalyzed cross-coupling is a powerful method to attach groups to the base heterocycles through the formation of new carbon-carbon and carbon-heteroatom bonds. In this review, approaches to palladium-catalyzed modification of unprotected nucleosides, nucleotides, and oligonucleotides are reviewed. Polar reaction media, such as water or polar aprotic solvents, allow reactions to be performed directly on the hydrophilic nucleosides and nucleotides without the need to use protecting groups. Homogeneous aqueous-phase coupling reactions catalyzed by palladium complexes of water-soluble ligands provide a general approach to the synthesis of modified nucleosides, nucleotides, and oligonucleotides.
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Affiliation(s)
- Kevin H Shaughnessy
- Department of Chemistry, The University of Alabama, Box 870336, Tuscaloosa, AL 35487-0336, USA.
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12
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Liang Y, Wnuk SF. Modification of purine and pyrimidine nucleosides by direct C-H bond activation. Molecules 2015; 20:4874-901. [PMID: 25789821 PMCID: PMC6272170 DOI: 10.3390/molecules20034874] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2015] [Revised: 03/11/2015] [Accepted: 03/13/2015] [Indexed: 12/02/2022] Open
Abstract
Transition metal-catalyzed modifications of the activated heterocyclic bases of nucleosides as well as DNA or RNA fragments employing traditional cross-coupling methods have been well-established in nucleic acid chemistry. This review covers advances in the area of cross-coupling reactions in which nucleosides are functionalized via direct activation of the C8-H bond in purine and the C5-H or C6-H bond in uracil bases. The review focuses on Pd/Cu-catalyzed couplings between unactivated nucleoside bases with aryl halides. It also discusses cross-dehydrogenative arylations and alkenylations as well as other reactions used for modification of nucleoside bases that avoid the use of organometallic precursors and involve direct C-H bond activation in at least one substrate. The scope and efficiency of these coupling reactions along with some mechanistic considerations are discussed.
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Affiliation(s)
- Yong Liang
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
| | - Stanislaw F Wnuk
- Department of Chemistry and Biochemistry, Florida International University, Miami, FL 33199, USA.
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13
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Gayakhe V, Sanghvi YS, Fairlamb IJS, Kapdi AR. Catalytic C–H bond functionalisation of purine and pyrimidine nucleosides: a synthetic and mechanistic perspective. Chem Commun (Camb) 2015; 51:11944-60. [DOI: 10.1039/c5cc03416g] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
C–H bond functionalisation of heteroarenes, especially nucleosides, has received a lot of attention in the past few years. This review describes the state-of the art in this area with a global aspiration for possibly functionalising purine and pyrimidine moieties in complex biomolecular systems.
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14
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Reay AJ, Williams TJ, Fairlamb IJS. Unified mild reaction conditions for C2-selective Pd-catalysed tryptophan arylation, including tryptophan-containing peptides. Org Biomol Chem 2015; 13:8298-309. [DOI: 10.1039/c5ob01174d] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Mild Pd-mediated C–H functionalisation protocols, facilitating tryptophan C2-arylation, have been developed. Tryptophan-containing peptides, susceptible to oxidation, have been arylated.
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15
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De Ornellas S, Slattery JM, Edkins RM, Beeby A, Baumann CG, Fairlamb IJS. Design and synthesis of fluorescent 7-deazaadenosine nucleosides containing π-extended diarylacetylene motifs. Org Biomol Chem 2015; 13:68-72. [DOI: 10.1039/c4ob02081b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel series of C-modified π-extended 7-deazaadenosines exhibit promising fluorescence properties.
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Affiliation(s)
- Sara De Ornellas
- Department of Chemistry
- University of York
- York
- UK
- Department of Biology
| | | | | | - Andrew Beeby
- Department of Chemistry
- University of Durham
- Durham
- UK
| | - Christoph G. Baumann
- Department of Biology
- University of York
- York
- UK
- Biological Physical Sciences Institute (BPSI)
| | - Ian J. S. Fairlamb
- Department of Chemistry
- University of York
- York
- UK
- Biological Physical Sciences Institute (BPSI)
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16
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Baumann CG, De Ornellas S, Reeds JP, Storr TE, Williams TJ, Fairlamb IJ. Formation and propagation of well-defined Pd nanoparticles (PdNPs) during C–H bond functionalization of heteroarenes: are nanoparticles a moribund form of Pd or an active catalytic species? Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.06.002] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Brackemeyer D, Hervé A, Schulte to Brinke C, Jahnke MC, Hahn FE. A versatile methodology for the regioselective C⁸-metalation of purine bases. J Am Chem Soc 2014; 136:7841-4. [PMID: 24823250 DOI: 10.1021/ja5030904] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Purine nucleobases are excellent ligands for metal ions, forming normally coordinative Werner-type bonds by utilizing the N donor atoms of the nucleobase skeleton. Here we show that purines such as 8-chlorocaffeine and 8-bromo-9-methyladenine react with [Pt(PPh3)4] under oxidative addition of the C(8)-halogen bond to the metal center. The resulting Pt(II) complexes feature a C(8)-bound ylidene ligand. Protonation of the ylidene at the N(7/9)-atom yields complexes bearing a protic N-heterocyclic carbene ligand derived from the purine base with an NMe,NH-substitution pattern.
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Affiliation(s)
- Dirk Brackemeyer
- Institut für Anorganische und Analytische Chemie, Westfälische Wilhelms-Universität Münster , D-48149 Münster, Germany
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18
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Williams TJ, Reay AJ, Whitwood AC, Fairlamb IJS. A mild and selective Pd-mediated methodology for the synthesis of highly fluorescent 2-arylated tryptophans and tryptophan-containing peptides: a catalytic role for Pd0 nanoparticles? Chem Commun (Camb) 2014; 50:3052-4. [DOI: 10.1039/c3cc48481e] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
The C2-arylation of tryptophan derivatives, and small peptides containing tryptophan, is possible using a Pd/Cu co-catalyst system. The products are highly fluorescent, with potential for studying protein function.
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Affiliation(s)
| | - Alan J. Reay
- Department of Chemistry
- University of York
- York, UK YO10 5DD
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19
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Derridj F, Si Larbi K, Roger J, Djebbar S, Doucet H. Palladium-catalyzed direct arylation using free NH2 substituted thiophene derivatives with inhibition of amination type reaction. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.06.053] [Citation(s) in RCA: 16] [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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20
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Derridj F, Roger J, Djebbar S, Doucet H. Catalytic System for Inhibition of Amination-Type Reaction and Palladium-Catalysed Direct Arylation using Non-Protected Pyrazole Derivatives. Adv Synth Catal 2012. [DOI: 10.1002/adsc.201100726] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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21
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Bajwa SE, Storr TE, Hatcher LE, Williams TJ, Baumann CG, Whitwood AC, Allan DR, Teat SJ, Raithby PR, Fairlamb IJS. On the appearance of nitrite anion in [PdX(OAc)L2] and [Pd(X)(C^N)L] syntheses (X = OAc or NO2): photocrystallographic identification of metastable Pd(η1-ONO)(C^N)PPh3. Chem Sci 2012. [DOI: 10.1039/c2sc01050j] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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22
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Vabre R, Chevot F, Legraverend M, Piguel S. Microwave-Assisted Pd/Cu-Catalyzed C-8 Direct Alkenylation of Purines and Related Azoles: An Alternative Access to 6,8,9-Trisubstituted Purines. J Org Chem 2011; 76:9542-7. [DOI: 10.1021/jo201893h] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Roxane Vabre
- Univ Paris-Sud, Orsay, F-91405, France
- Institut Curie/CNRS, UMR 176, Bât. 110-112, Centre Universitaire, 91405 Orsay
France
| | - Franciane Chevot
- Univ Paris-Sud, Orsay, F-91405, France
- Institut Curie/CNRS, UMR 176, Bât. 110-112, Centre Universitaire, 91405 Orsay
France
| | - Michel Legraverend
- Institut Curie/CNRS, UMR 176, Bât. 110-112, Centre Universitaire, 91405 Orsay
France
| | - Sandrine Piguel
- Univ Paris-Sud, Orsay, F-91405, France
- Institut Curie/CNRS, UMR 176, Bât. 110-112, Centre Universitaire, 91405 Orsay
France
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