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Ward JS, Lynam JM, Moir JWB, Sanin DE, Mountford AP, Fairlamb IJS. A therapeutically viable photo-activated manganese-based CO-releasing molecule (photo-CO-RM). Dalton Trans 2012; 41:10514-7. [DOI: 10.1039/c2dt31588b] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
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77
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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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78
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Serrano JL, García L, Pérez J, Pérez E, García J, Sánchez G, Sehnal P, De Ornellas S, Williams TJ, Fairlamb IJS. Synthesis and Characterization of Imine-Palladacycles Containing Imidate “Pseudohalide” Ligands: Efficient Suzuki–Miyaura Cross-Coupling Precatalysts and Their Activation To Give Pd0Ln Species (L = Phosphine). Organometallics 2011. [DOI: 10.1021/om2002443] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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79
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G. Jarvis A, J. S. Fairlamb I. The Influence of Alkenes as π -Acidic Ligands in Pd-Catalysed Cross-Couplings. CURR ORG CHEM 2011. [DOI: 10.2174/138527211797248012] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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80
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Firth AG, Wilson K, Baumann CG, Fairlamb IJS. Interrogation of a Sonogashira cross-coupling of 8-bromoguanosine with phenylacetylene on amberlite: evidence for Pd/Cu ion binding and propagation of Pd/Cu nanoparticles. NUCLEOSIDES NUCLEOTIDES & NUCLEIC ACIDS 2011; 30:168-84. [PMID: 21360413 DOI: 10.1080/15257770.2010.548844] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The reactivity of Amberlite (IRA-67) base "heterogeneous" resin in Sonogashira cross-coupling of 8-bromoguanosine 1 with phenylacetylene 3 to give 2 has been examined. Both 1 and 2 coordinate to Pd and Cu ions, which explains why at equivalent catalyst loadings, the homogeneous reaction employing triethylamine base is poor yielding. X-ray photo-electron spectroscopy (XPS) has been used to probe and quantify the active nitrogen base sites of the Amberlite resin, and postreaction Pd and Cu species. The PdCl(2)(PPh(3))(2) precatalyst and CuI cocatalyst degrade to give Amberlite-supported metal nanoparticles (average size ∼2.7 nm). The guanosine product 2 formed using the Amberlite Pd/Cu catalyst system is of higher purity than reactions using a homogeneous Pd precatalyst, a prerequisite for use in biological applications.
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81
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Zhang WQ, Atkin AJ, Fairlamb IJS, Whitwood AC, Lynam JM. Synthesis and Reactivity of Molybdenum Complexes Containing Functionalized Alkynyl Ligands: A Photochemically Activated CO-Releasing Molecule (PhotoCO-RM). Organometallics 2011. [DOI: 10.1021/om200495h] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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82
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Jarvis AG, Fairlamb IJS. Edited by L. S. Hegedus and B. C. G. Söderberg Transition Metals in the Synthesis of Complex Organic Molecules, 3rd edn University Science Books, Sausalito, 2009, 480 pp. ISBN 978-1-891389-59-7, ©2009, Hardcover, 480 pages. Appl Organomet Chem 2011. [DOI: 10.1002/aoc.1769] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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83
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Moulton BE, Whitwood AC, Duhme-Klair AK, Lynam JM, Fairlamb IJS. Regiochemistry in Cobalt-Mediated Intermolecular Pauson–Khand Reactions of Unsymmetrical Internal Heteroaromatic Alkynes with Norbornene. J Org Chem 2011; 76:5320-34. [DOI: 10.1021/jo200664m] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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84
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Jarvis AG, Whitwood AC, Fairlamb IJS. CuI complexes containing a multidentate and conformationally flexible dibenzylidene acetone ligand (dbathiophos): Application in catalytic alkene cyclopropanation. Dalton Trans 2011; 40:3695-702. [DOI: 10.1039/c0dt01612h] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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85
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Atkin AJ, Lynam JM, Moulton BE, Sawle P, Motterlini R, Boyle NM, Pryce MT, Fairlamb IJS. Modification of the deoxy-myoglobin/carbonmonoxy-myoglobin UV-vis assay for reliable determination of CO-release rates from organometallic carbonyl complexes. Dalton Trans 2011; 40:5755-61. [DOI: 10.1039/c0dt01809k] [Citation(s) in RCA: 140] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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86
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Storr TE, Baumann CG, Thatcher RJ, De Ornellas S, Whitwood AC, Fairlamb IJS. Pd(0)/Cu(I)-mediated direct arylation of 2'-deoxyadenosines: mechanistic role of Cu(I) and reactivity comparisons with related purine nucleosides. J Org Chem 2010; 74:5810-21. [PMID: 19630437 DOI: 10.1021/jo9012282] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pd/Cu-mediated direct arylation of 2'-deoxyadenosine with various aryl iodides provides 8-arylated 2'-deoxyadenosine derivatives in good yields. Following significant reaction optimization, it has been determined that a substoichiometric quantity of piperidine (secondary amine) in combination with cesium carbonate is necessary for effective direct arylation. The general synthetic protocol allows lower temperature direct arylations, which minimizes deglycosylation. The origin of the piperidine effect primarily derives from the in situ generation of Pd(OAc)(2)[(CH(2))(5)NH](2). Various copper(I) salts have been evaluated; only CuI provides good yields of the 8-arylated-2'-deoxyadenosines. Copper(I) appears to have a high binding affinity for 2'-deoxyadenosine, which explains the mandatory requirement for stoichiometric amounts of this key component. The conditions are compared with more general direct arylation protocols, e.g., catalytic Pd, ligand, acid additives, which do not employ copper(I). In each case, no detectable arylation of 2'-deoxyadenosine was noted. The conformational preferences of the 8-aryl-2'-deoxyadenosine products have been determined by detailed spectroscopic (NMR) and single crystal X-ray diffraction studies. Almost exclusively, the preferred solution-state conformation was determined to be syn-C2'-endo (ca. 80%). The presence of a 2-pyridyl group at the 8-position further biases the solution-state equilibrium toward this conformer (ca. 88%), due to an additional H-bond between H1' and the pyridyl nitrogen atom. The Pd/Cu catalyst system has been found to be unique for adenosine type substrates, the reactivity of which has been placed into context with the reported direct arylations of related 1H-imidazoles. The reactivity of other purine nucleosides has been assessed, which has revealed that both 2'-deoxyguanosine and guanosine are incompatible with the Pd/Cu-direct arylation conditions. Both substrates appear to hinder catalysis, akin to the established inhibitory effects in Suzuki cross-couplings with arylboronic acids.
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87
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Zhang WQ, Whitwood AC, Fairlamb IJS, Lynam JM. Group 6 Carbon Monoxide-Releasing Metal Complexes with Biologically-Compatible Leaving Groups. Inorg Chem 2010; 49:8941-52. [DOI: 10.1021/ic101230j] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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88
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Storr TE, Strohmeier JA, Baumann CG, Fairlamb IJS. A sequential direct arylation/Suzuki-Miyaura cross-coupling transformation of unprotected 2'-deoxyadenosine affords a novel class of fluorescent analogues. Chem Commun (Camb) 2010; 46:6470-2. [PMID: 20714566 DOI: 10.1039/c0cc02043e] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Novel rigid 8-biaryl-2'-deoxyadenosines with tuneable fluorescent properties can be accessed by an efficient sequential catalytic Pd(0)-coupling approach.
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89
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Fairlamb IJS, Lloyd-Jones GC, Martorell A, Murray M, Stephen SC, Tomlin PM. ISOTOPIC DESYMMETRIZATION IN THE STUDY OF HOMOGENEOUS CATALYSIS. PHOSPHORUS SULFUR 2010. [DOI: 10.1080/10426500490428889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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90
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Sehnal P, Taylor RJK, Fairlamb IJS. Emergence of palladium(IV) chemistry in synthesis and catalysis. Chem Rev 2010; 110:824-89. [PMID: 20143876 DOI: 10.1021/cr9003242] [Citation(s) in RCA: 543] [Impact Index Per Article: 38.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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91
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Reeds JP, Whitwood AC, Healy MP, Fairlamb IJS. Remarkable anion effects uncovered in the development of a Au(iii)-catalyzed tandem nucleophilic substitution–1,5-enyne cycloisomerization process. Chem Commun (Camb) 2010; 46:2046-8. [DOI: 10.1039/b925919h] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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92
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Burns MJ, Thatcher RJ, Taylor RJK, Fairlamb IJS. Pd-catalysed regioselective C–H functionalisation of 2-pyrones. Dalton Trans 2010; 39:10391-400. [DOI: 10.1039/c0dt00421a] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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93
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Lee AF, Ellis PJ, Fairlamb IJS, Wilson K. Surface catalysed Suzuki–Miyaura cross-coupling by Pd nanoparticles: an operando XAS study. Dalton Trans 2010; 39:10473-82. [DOI: 10.1039/c0dt00412j] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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94
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Eastoe J, Fairlamb IJS, Fernández-Hernández JM, Filali E, Jeffery JC, Lloyd-Jones GC, Martorell A, Meadowcroft A, Norrby PO, Riis-Johannessen T, Sale DA, Tomlin PM. Interrogation of a dynamic multi-catalyst ensemble in asymmetric catalysis. Faraday Discuss 2010. [DOI: 10.1039/b910022a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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95
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Moulton BE, Lynam JM, Duhme-Klair AK, Zheng W, Lin Z, Fairlamb IJS. Atropisomerisation in sterically hindered α,β-disubstituted cyclopentenones derived from an intermolecular cobalt(0)-mediated Pauson–Khand reaction. Org Biomol Chem 2010; 8:5398-403. [DOI: 10.1039/c0ob00264j] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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96
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McGlacken GP, Fairlamb IJS. Palladium‐Catalysed Cross‐Coupling and Related Processes: Some Interesting Observations That Have Been Exploited in Synthetic Chemistry. European J Org Chem 2009. [DOI: 10.1002/ejoc.200900139] [Citation(s) in RCA: 98] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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97
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McGlacken GP, Fairlamb IJS. Palladium-Catalysed Cross-Coupling and Related Processes: Some Interesting Observations That Have Been Exploited in Synthetic Chemistry (Eur. J. Org. Chem. 24/2009). European J Org Chem 2009. [DOI: 10.1002/ejoc.200990066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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98
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Sehnal P, Taghzouti H, Fairlamb IJS, Jutand A, Lee AF, Whitwood AC. Heteroaromatic Analogues of Dibenzylideneacetone (dba) and Pd02(het-dba)3 Complexes: Effect of a Thienyl Moiety on the Reactivity of Pd0(η2-thn-dba)(PPh3)2/Pd0(PPh3)2 (n = 1 or 2) and Pd0(η2-th2-dba)(dppe)/Pd0(dppe) in Oxidative Addition Reactions with Iodobenzene. Organometallics 2009. [DOI: 10.1021/om800975w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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99
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Hurst EC, Wilson K, Fairlamb IJS, Chechik V. N-Heterocyclic carbene coated metal nanoparticles. NEW J CHEM 2009. [DOI: 10.1039/b905559b] [Citation(s) in RCA: 140] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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100
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Fairlamb IJS. The phosphine-catalyzed Wittig reaction: a new vista for olefin synthesis? CHEMSUSCHEM 2009; 2:1021-4. [PMID: 19882703 DOI: 10.1002/cssc.200900208] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
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