76
|
Bugaut A, Jantos K, Wietor JL, Rodriguez R, Sanders JKM, Balasubramanian S. Exploring the differential recognition of DNA G-quadruplex targets by small molecules using dynamic combinatorial chemistry. Angew Chem Int Ed Engl 2008; 47:2677-80. [PMID: 18300215 DOI: 10.1002/anie.200705589] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
77
|
Wietor JL, Pantoş GD, Sanders JKM. Templated amplification of an unexpected receptor for C70. Angew Chem Int Ed Engl 2008; 47:2689-92. [PMID: 18306192 DOI: 10.1002/anie.200704983] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
78
|
Mullen KM, Johnstone KD, Webb M, Bampos N, Sanders JKM, Gunter MJ. Monitoring the thermodynamically-controlled formation of diimide-based resin-attached rotaxanes by gel-phase HR MAS1H NMR spectroscopy. Org Biomol Chem 2008; 6:278-86. [DOI: 10.1039/b716325h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
79
|
Pérez-Fernández R, Pittelkow M, Belenguer AM, Sanders JKM. Phase-transfer dynamic combinatorial chemistry. Chem Commun (Camb) 2008:1738-40. [DOI: 10.1039/b718075f] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
80
|
Pascu SI, Kuganathan N, Tong LH, Jacobs RMJ, Barnard PJ, Chu BT, Huh Y, Tobias G, Salzmann CG, Sanders JKM, Green MLH, Green JC. Interactions between tripodal porphyrin hosts and single walled carbon nanotubes: an experimental and theoretical (DFT) account. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b719494c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
81
|
Metselaar GA, Sanders JKM, de Mendoza J. A self-assembled aluminium(iii) porphyrin cyclic trimer. Dalton Trans 2008:588-90. [DOI: 10.1039/b717017n] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
82
|
Corbett PT, Leclaire J, Vial L, West KR, Wietor JL, Sanders JKM, Otto S. Dynamic combinatorial chemistry. Chem Rev 2007; 106:3652-711. [PMID: 16967917 DOI: 10.1021/cr020452p] [Citation(s) in RCA: 1486] [Impact Index Per Article: 87.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
|
83
|
Ludlow RF, Liu J, Li H, Roberts SL, Sanders JKM, Otto S. Host–Guest Binding Constants Can Be Estimated Directly from the Product Distributions of Dynamic Combinatorial Libraries. Angew Chem Int Ed Engl 2007; 46:5762-4. [PMID: 17600803 DOI: 10.1002/anie.200700292] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
|
84
|
Pantoş GD, Wietor JL, Sanders JKM. Filling Helical Nanotubes with C60. Angew Chem Int Ed Engl 2007; 46:2238-40. [PMID: 17309089 DOI: 10.1002/anie.200604891] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
85
|
Liu J, West KR, Bondy CR, Sanders JKM. Dynamic combinatorial libraries of hydrazone-linked pseudo-peptides: dependence of diversity on building block structure and chirality. Org Biomol Chem 2007; 5:778-86. [PMID: 17315064 DOI: 10.1039/b617217b] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Expanding on our earlier building block architecture [(MeO)(2)CH-Linker-Pro-X-NHNH(2) where X = Phe, Cha], we have produced a series of new pseudo-dipeptides [(MeO)(2)CH-Linker-Pro-X-NHNH(2) where X = Val, Leu, Ile, Ala] for use in hydrazone-based dynamic combinatorial libraries (DCLs); reverse order analogues [Phe-Pro and Val-Pro] and two enantio-analogues [Pro-Phe and Pro-Val] were also prepared. The behaviours of these building blocks in DCLs, as single components and in mixtures, were studied systematically using HPLC and mass spectrometry in order to gain insight into the relationship between building block structure and good library diversity. Subtle changes in building block structure lead to significant changes in library distribution and in the ability to produce diverse libraries in mixtures.
Collapse
|
86
|
Pascu SI, Naumann C, Kaiser G, Bond AD, Sanders JKM, Jarrosson T. Structures and solution dynamics of pseudorotaxanes mediated by alkali-metal cations. Dalton Trans 2007:3874-84. [PMID: 17893785 DOI: 10.1039/b706043b] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Kinetic stability studies of a series of pseudorotaxanes formed from electron-rich crown ethers (hosts 1 and 2) and naphthalene diimide (guest A) in the presence of alkali salt templates MX (where M+ = Li+ and Na+, and X- = Cl-, Br-, I-, NO3- and CF3SO3-) were performed by 1H NMR. The switching between the (bound) host 1 and its linkage isomer host 2 (free) was monitored in solution in the presence and absence of alkali salts, to establish the relative thermodynamic stabilities in the series. We also report here six new crystal structures, for pseudorotaxanes of type: [1.A], [M2.1.A]2+ and [M2.2.A]2+. Their solution-phase structures are in good agreement with the solid-state structures determined by X-ray crystallography.
Collapse
|
87
|
Rodriguez R, Pantoş GD, Gonçalves DPN, Sanders JKM, Balasubramanian S. Ligand-driven G-quadruplex conformational switching by using an unusual mode of interaction. Angew Chem Int Ed Engl 2007; 46:5405-7. [PMID: 17562537 PMCID: PMC2277493 DOI: 10.1002/anie.200605075] [Citation(s) in RCA: 109] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
88
|
Bulos F, Roberts SL, Furlan RLE, Sanders JKM. Molecular amplification of two different receptors using diastereomeric templates. Chem Commun (Camb) 2007:3092-3. [PMID: 17639152 DOI: 10.1039/b705620f] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two different macrocyclic members of a pseudo-peptide hydrazone dynamic combinatorial library were amplified using the diastereomeric templates quinine and quinidine.
Collapse
|
89
|
|
90
|
Gonçalves DPN, Rodriguez R, Balasubramanian S, Sanders JKM. Tetramethylpyridiniumporphyrazines--a new class of G-quadruplex inducing and stabilising ligands. Chem Commun (Camb) 2006:4685-7. [PMID: 17109036 PMCID: PMC2220048 DOI: 10.1039/b611731g] [Citation(s) in RCA: 113] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
3,4-Tetramethylpyridiniumporphyrazines bind strongly and selectively to human telomeric G-quadruplex DNA, inducing the formation of an antiparallel quadruplex in a process that mimics molecular chaperones.
Collapse
|
91
|
Gonçalves DPN, Ladame S, Balasubramanian S, Sanders JKM. Synthesis and G-quadruplex binding studies of new 4-N-methylpyridinium porphyrins. Org Biomol Chem 2006; 4:3337-42. [PMID: 17036123 PMCID: PMC2195891 DOI: 10.1039/b608494j] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of cationic porphyrins carrying 1-3 meso-N-pyridinium groups has been synthesised, and their binding to G-quadruplex DNA has been explored by surface plasmon resonance (SPR) and circular dichroism spectroscopy. Two trans substituents appear to be sufficient for tight binding; preferential binding to the anti-parallel intramolecular human telomeric DNA was observed for the A2trans and A3 porphyrins. The A2trans is able to induce the formation of an anti-parallel G-quadruplex in a K+ free solution, mimicking the effect of a molecular chaperone.
Collapse
|
92
|
Pengo P, Pantos GD, Otto S, Sanders JKM. Efficient and Mild Microwave-Assisted Stepwise Functionalization of Naphthalenediimide with α-Amino Acids. J Org Chem 2006; 71:7063-6. [PMID: 16930065 DOI: 10.1021/jo061195h] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Microwave dielectric heating proved to be an efficient method for the one-pot and stepwise syntheses of symmetrical and unsymmetrical naphthalenediimide derivatives of alpha-amino acids. Acid-labile side chain protecting groups are stable under the reaction conditions; protection of the alpha-carboxylic group is not required. The stepwise condensation of different amino acids resulted in high yields of unsymmetrical naphthalenediimides. The reaction proceeds without racemization and is essentially quantitative.
Collapse
|
93
|
Vaughan OPH, Turner M, Williams FJ, Hille A, Sanders JKM, Lambert RM. Direct Observation of Surface-Mediated Thioacetyl Deprotection: Covalent Tethering of a Thiol-Terminated Porphyrin to the Ag(100) Surface. J Am Chem Soc 2006; 128:9578-9. [PMID: 16866481 DOI: 10.1021/ja061247k] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Covalent tethering of macromolecules such as porphyrins to metal surfaces underpins bottom-up fabrication of systems intended for a variety of applications. Thiol linkages are especially useful but often need protection during macromolecule synthesis. By means of scanning tunneling microscopy, we directly observe the spontaneous deprotection of an acetyl-protected thioporphyrin upon contact with a silver surface, without the intervention of any solution-mediated chemistry.
Collapse
|
94
|
Anderson S, Anderson HL, Sanders JKM. „Reinigungstemplate”︁: Synthese und Electrospray-Massenspektrometrie eines linearen Porphyrin-Octamers. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.19921040738] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
|
95
|
Johnstone KD, Bampos N, Sanders JKM, Gunter MJ. Gel-phase HR-MAS 1H NMR spectroscopy as a probe for solid-tethered diimide rotaxanes and catenanes. NEW J CHEM 2006. [DOI: 10.1039/b602555b] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
96
|
Tong LH, Pascu SI, Jarrosson T, Sanders JKM. Large-scale synthesis of alkyne-linked tripodal porphyrins via palladium-mediated coupling conditions. Chem Commun (Camb) 2006:1085-7. [PMID: 16514447 DOI: 10.1039/b515902d] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Suzuki and Sonogashira couplings have been used in short and efficient sequences to give access to a new family of porphyrin trimers on a practical scale.
Collapse
|
97
|
Davidson GJE, Tong LH, Raithby PR, Sanders JKM. Aluminium(iii) porphyrins as supramolecular building blocks. Chem Commun (Camb) 2006:3087-9. [PMID: 16855694 DOI: 10.1039/b605435h] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Aluminium(III) porphyrin-carboxylate complexes, including a porphyrin pentamer, have been characterised by NMR spectroscopy, MALDI spectrometry and single crystal X-ray diffraction; these complexes can also be coordinated by a sixth, nitrogenous, ligand to the aluminium(III) centre.
Collapse
|
98
|
Corbett PT, Sanders JKM, Otto S. Competition between receptors in dynamic combinatorial libraries: amplification of the fittest? J Am Chem Soc 2005; 127:9390-2. [PMID: 15984865 DOI: 10.1021/ja0509026] [Citation(s) in RCA: 97] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Dynamic combinatorial chemistry is a powerful tool for the discovery of strong binders (synthetic receptors or ligands) because binding causes a shift in the equilibrium of library members toward those that bind well. Ideally, the best binders are selectively amplified. However, theoretical studies predict this is not always the case. This paper describes the first quantitative experimental evidence proving that, under special circumstances, the preferential amplification of suboptimal synthetic receptors can indeed occur. Our results also demonstrate that reducing the amount of guest in the library can rectify such undesirable behavior and ensures selective amplification of the fittest receptor.
Collapse
|
99
|
Corbett PT, Tong LH, Sanders JKM, Otto S. Diastereoselective amplification of an induced-fit receptor from a dynamic combinatorial library. J Am Chem Soc 2005; 127:8902-3. [PMID: 15969538 DOI: 10.1021/ja050790i] [Citation(s) in RCA: 108] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A high-affinity, induced-fit receptor for NMe4I was discovered using dynamic combinatorial chemistry. The addition of the guest to a dynamic combinatorial library made using a racemic mixture of chiral building blocks caused the strong and highly diastereoselective amplification of the receptor at the expense of other library components. The receptor and its mode of binding were characterized by NMR, ITC, and re-equilibration experiments, from which it was deduced that the receptor probably forms a folded four-stave barrel shape on binding of the guest.
Collapse
|
100
|
Ballester P, Costa A, Deyà PM, Frontera A, Gomila RM, Oliva AI, Sanders JKM, Hunter CA. Self-Assembly, Binding, and Dynamic Properties of Heterodimeric Porphyrin Macrocycles. J Org Chem 2005; 70:6616-22. [PMID: 16095278 DOI: 10.1021/jo0505369] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A series of heterodimeric tetralactam macrocycles have been self-assembled using two kinetically labile zinc porphyrin-pyridine interactions. The stability constants have been determined by UV-vis titrations in CHCl3. The stability constants depend on the degree of preorganization of the linker units connecting the interacting groups. The ability of the self-assembled macrocycles to bind a terephthalamide guest was also investigated. One of the macrocycles was used for the construction of a [2]rotaxane. The dynamic properties of this system provide insight into the exchange mechanisms that operate in complex noncovalent assemblies.
Collapse
|