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Au-Yeung HY, Pantoş GD, Sanders JKM. A water soluble donor-acceptor [2]catenane that can switch between a coplanar and a Gemini-sign conformation. Angew Chem Int Ed Engl 2011; 49:5331-4. [PMID: 20572219 DOI: 10.1002/anie.201000807] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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52
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Klein JM, Saggiomo V, Reck L, McPartlin M, Pantoş GD, Lüning U, Sanders JKM. A remarkably flexible and selective receptor for Ba2+ amplified from a hydrazone dynamic combinatorial library. Chem Commun (Camb) 2011; 47:3371-3. [PMID: 21264417 DOI: 10.1039/c0cc04863a] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new [2+2] tetra-hydrazone macrocyclic receptor was significantly amplified in a dynamic combinatorial library upon templation with alkaline earth metal ions. After optimisation the product could be isolated in 95% yield and its interaction with ions was investigated by NMR and UV-Vis spectroscopy.
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53
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Iengo E, Pantoş GD, Sanders JKM, Orlandi M, Chiorboli C, Fracasso S, Scandola F. A fully self-assembled non-symmetric triad for photoinduced charge separation. Chem Sci 2011. [DOI: 10.1039/c0sc00520g] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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54
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Bond AD, Sanders JKM, Stulz E. Ruthenium(ii) and rhodium(iii) porphyrin phosphine complexes: influence of substitution pattern on structure and electronic properties. NEW J CHEM 2011. [DOI: 10.1039/c1nj20598f] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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55
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Tong LH, Pengo P, Clegg W, Lowe JP, Raithby PR, Sanders JKM, Pascu SI. Complexes of aryl-substituted porphyrins and naphthalenediimide (NDI): investigations by synchrotron X-ray diffraction and NMR spectroscopy. Dalton Trans 2011; 40:10833-42. [DOI: 10.1039/c1dt10880h] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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56
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Beeren SR, Sanders JKM. Ferrocene-amino acid macrocycles as hydrazone-based receptors for anions. Chem Sci 2011. [DOI: 10.1039/c1sc00168j] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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57
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Belenguer AM, Friščić T, Day GM, Sanders JKM. Solid-state dynamic combinatorial chemistry: reversibility and thermodynamic product selection in covalent mechanosynthesis. Chem Sci 2011. [DOI: 10.1039/c0sc00533a] [Citation(s) in RCA: 141] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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58
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Anderson TW, Pantoş GD, Sanders JKM. Supramolecular chemistry of monochiral naphthalenediimides. Org Biomol Chem 2011; 9:7547-53. [DOI: 10.1039/c1ob06147j] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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59
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Abstract
Slight changes in the shape of organic molecules can dramatically alter the size of hollow spheres that form spontaneously upon addition of palladium ions.
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60
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Simpson MG, Pittelkow M, Watson SP, Sanders JKM. Dynamic combinatorial chemistry with hydrazones: libraries incorporating heterocyclic and steroidal motifs. Org Biomol Chem 2010; 8:1181-7. [PMID: 20165811 DOI: 10.1039/b917146k] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
We expand the possibilities in hydrazone based dynamic combinatorial chemistry with a series of new building blocks incorporating heterocyclic motifs. The synthetic procedure allows efficient access to building blocks with the general structure (MeO)(2)CH-Heterocycle-C(O)NHNH(2), originating from heterocycles with an amine and an ester functionality. The equilibrium distribution of macrocyclic N-acyl hydrazones formed upon deprotection of the building blocks with TFA in organic solvents is reported. The mixing behaviour of these heterocycle-based building blocks with our cholate-based building blocks is described, particularly the observation of kinetic intermediates that disappear following 'proof-reading'.
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61
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Turner M, Vaughan OPH, Kyriakou G, Watson DJ, Scherer LJ, Papageorgiou AC, Sanders JKM, Lambert RM. Deprotection, tethering, and activation of a one-legged metalloporphyrin on a chemically active metal surface: NEXAFS, synchrotron XPS, and STM study of [SAc]P-Mn(III)Cl on Ag(100). J Am Chem Soc 2010; 131:14913-9. [PMID: 19785425 DOI: 10.1021/ja904664e] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The structural and reactive properties of the acetyl-protected "one-legged" manganese porphyrin [SAc]P-Mn(III)Cl on Ag(100) have been studied by NEXAFS, synchrotron XPS and STM. Spontaneous surface-mediated deprotection occurs at 300 K accompanied by spreading of the resulting thio-tethered porphyrin across the metal surface. Loss of the axial chlorine ligand occurs at 498 K, without any demetalation of the macrocycle, leaving the Mn center in a low co-ordination state. At low coverages the macrocycle is markedly tilted toward the silver surface, as is the phenyl group that forms part of the tethering "leg". In the monolayer region a striking transition occurs whereby the molecule rolls over, preserving the tilt angle of the phenyl group, strongly increasing that of the macrocycle, decreasing the apparent height of the molecule and decreasing its footprint, thus enabling closer packing. These findings are in marked contrast with those previously reported for the corresponding more rigidly bound four-legged porphyrin [ Turner , M. , Vaughan , O. P. H. , Kyriakou , G. , Watson , D. J. , Scherer , L. J. , Davidson , G. J. E. , Sanders , J. K. M. and Lambert , R. M. J. Am. Chem. Soc. 2009 , 131 , 1910 ] suggesting that the physicochemical properties and potential applications of these versatile systems should be strongly dependent on the mode of tethering to the surface.
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Au-Yeung HY, Cougnon FBL, Otto S, Pantoş GD, Sanders JKM. Exploiting donor–acceptor interactions in aqueous dynamic combinatorial libraries: exploratory studies of simple systems. Chem Sci 2010. [DOI: 10.1039/c0sc00307g] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
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63
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Anderson TW, Sanders JKM, Pantoş GD. The sergeants-and-soldiers effect: chiral amplification in naphthalenediimide nanotubes. Org Biomol Chem 2010; 8:4274-80. [DOI: 10.1039/c0ob00027b] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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64
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Tamanini E, Ponnuswamy N, Pantoş GD, Sanders JKM. New host–guest chemistry of supramolecular nanotubes. Faraday Discuss 2010. [DOI: 10.1039/b907538k] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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65
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Simpson MG, Pittelkow M, Watson SP, Sanders JKM. Dynamic combinatorial chemistry with hydrazones: cholate-based building blocks and libraries. Org Biomol Chem 2010; 8:1173-80. [DOI: 10.1039/b917145b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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66
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Au-Yeung HY, Dan Pantoş G, Sanders JKM. Amplifying Different [2]Catenanes in an Aqueous Donor−Acceptor Dynamic Combinatorial Library. J Am Chem Soc 2009; 131:16030-2. [DOI: 10.1021/ja906634h] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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67
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Sanders JKM, Jackson SE. The discovery and development of the green fluorescent protein, GFP. Chem Soc Rev 2009; 38:2821-2. [PMID: 19771328 DOI: 10.1039/b917331p] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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68
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Pérez-Fernández R, Pittelkow M, Belenguer AM, Lane LA, Robinson CV, Sanders JKM. Two-phase dynamic combinatorial discovery of a spermine transporter. Chem Commun (Camb) 2009:3708-10. [PMID: 19557256 DOI: 10.1039/b902842k] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The discovery, in a two-phase dynamic combinatorial library, of an unexpected linear receptor and transporter for spermine is described.
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69
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Henn A, Joachimi A, Gonçalves DPN, Monchaud D, Teulade-Fichou MP, Sanders JKM, Hartig JS. Inhibition of dicing of guanosine-rich shRNAs by quadruplex-binding compounds. Chembiochem 2009; 9:2722-9. [PMID: 18924215 DOI: 10.1002/cbic.200800271] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
RNA interference is triggered by small hairpin precursors that are processed by the endonuclease dicer to yield active species such as siRNAs and miRNAs. To regulate the RNAi-mediated suppression of gene expression, we imagined a strategy that relies on the sequence-specific inhibition of shRNA precursor processing by immediate RNA-small molecule interactions. Here, we present a first step in this direction by augmenting shRNAs with guanosine-rich sequences that are prone to fold into four-stranded structures. The addition of small molecules that selectively bind to such quadruplex sequences should allow for the specific inhibition of dicing of shRNAs that contain suitable G-rich elements. In an attempt to find compounds that protect against dicer processing, we have examined the effects of quadruplex-binding compounds on the dicer processing of shRNAs containing G-quadruplexes. Although a variety of small molecules that are known to bind to quadruplexes inhibited in vitro dicing of shRNAs, only two substance classes, namely certain porphyrazines and bisquinolinium compounds, showed selective inhibition of G-rich shRNAs compared to control sequences lacking guanine-rich elements. The G-rich shRNAs displayed a potent knockdown of gene expression in mammalian cell culture, but the effect was not influenced by addition of the respective quadruplex-binding compounds.
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Turner M, Vaughan OPH, Kyriakou G, Watson DJ, Scherer LJ, Davidson GJE, Sanders JKM, Lambert RM. Deprotection, Tethering, and Activation of a Catalytically Active Metalloporphyrin to a Chemically Active Metal Surface: [SAc]4P−Mn(III)Cl on Ag(100). J Am Chem Soc 2009; 131:1910-4. [DOI: 10.1021/ja8076389] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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71
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Au-Yeung HY, Pengo P, Pantoş GD, Otto S, Sanders JKM. Templated amplification of a naphthalenediimide-based receptor from a donor–acceptor dynamic combinatorial library in water. Chem Commun (Camb) 2009:419-21. [DOI: 10.1039/b816979a] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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72
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Bulheller BM, Pantoş GD, Sanders JKM, Hirst JD. Electronic structure and circular dichroism spectroscopy of naphthalenediimide nanotubes. Phys Chem Chem Phys 2009; 11:6060-5. [DOI: 10.1039/b905187b] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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73
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Mullen KM, Johnstone KD, Nath D, Bampos N, Sanders JKM, Gunter MJ. Crown-ether- and porphyrin-attached gel-phase resins in thermodynamically controlled rotaxane assembly. Org Biomol Chem 2009; 7:293-303. [DOI: 10.1039/b816115a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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74
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Besenius P, Cormack PAG, Liu J, Otto S, Sanders JKM, Sherrington DC. Tailored polymer-supported templates in dynamic combinatorial libraries: simultaneous selection, amplification and isolation of synthetic receptors. Chemistry 2008; 14:9006-9019. [PMID: 18752246 DOI: 10.1002/chem.200800326] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The thermodynamically controlled synthesis and isolation of macrocyclic receptors from dynamic combinatorial libraries has been achieved in a single step using a polymer-supported template. The templates were cinchona alkaloids which show interesting enantio- and diastereoselective molecular recognition events in libraries based on pseudo-dipeptide building blocks. The synthetic routes used to derivatise the alkaloids and attach them to polymer supports minimised any influence of the tethering linkage on the templating activity. Systematic studies have been carried out to probe how the polymer morphology and the template loading affect the selectivity and isolation yield of the macrocyclic receptors. Molecular recognition between solid-phase bound templates and selected receptors also enabled their affinity-type chromatographic separation.
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75
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Davidson GJE, Lane LA, Raithby PR, Warren JE, Robinson CV, Sanders JKM. Coordination Polymers Based on Aluminum(III) Porphyrins. Inorg Chem 2008; 47:8721-6. [DOI: 10.1021/ic800587y] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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