57499-17-9Relevant academic research and scientific papers
Lateral self-sorting on surfaces: A practical approach to double-channel photosystems
Lista, Marco,Areephong, Jetsuda,Sakai, Naomi,Matile, Stefan
supporting information; experimental part, p. 15228 - 15231 (2011/11/05)
We report that self-sorting during self-organizing surface-initiated copolymerization (co-SOSIP) provides facile access to oriented multicomponent architectures. Alternate lateral and uniform axial self-sorting into formal supramolecular n/p-heterojunction photosystems is found to generate up to 40 times more photocurrent. More or less topological matching gives rise to alternate axial self-sorting into inactive charge-transfer complexes or uniform lateral sorting into the less active macrodomains, respectively. Experimental support for self-repair during co-SOSIP is reported. Initiators on the surface are shown to serve as templates for the self-sorting into multichannel architectures of freely variable composition.
Self-organizing surface-initiated polymerization: Facile access to complex functional systems
Sakai, Naomi,Lista, Marco,Kel, Oksana,Sakurai, Shin-Ichiro,Emery, Daniel,Mareda, Jiri,Vauthey, Eric,Matile, Stefan
supporting information; experimental part, p. 15224 - 15227 (2011/11/06)
Facile access to complex systems is crucial to generate the functional materials of the future. Herein, we report self-organizing surface-initiated polymerization (SOSIP) as a user-friendly method to create ordered as well as oriented functional systems on transparent oxide surfaces. In SOSIP, self-organization of monomers and ring-opening disulfide exchange polymerization are combined to ensure the controlled growth of the polymer from the surface. This approach provides rapid access to thick films with smooth, reactivatable surfaces and long-range order with few defects and high precision, including panchromatic photosystems with oriented four-component redox gradients. The activity of SOSIP architectures is clearly better than that of disordered controls.
A 310-helix single turn enforced by crosslinking of lysines with 1,1′-ferrocenedicarboxylic acid
Curran, Timothy P.,Handy, Emma L.
experimental part, p. 902 - 907 (2009/05/27)
Prior work has shown that covalently linking the side chains of amino acids in the i and i+3 and i and i+4 positions in a peptide will enforce a helical conformation. In this work the ability of an organometallic entity to enforce a helical conformation i
Design, synthesis, and structure-activity relationships of macrocyclic hydroxamic acids that inhibit tumor necrosis factor α release in vitro and in vivo
Xue,Voss,Nelson,Duan,Cherney,Jacobson,He,Roderick,Chen,Corbett,Wang,Meyer,Kennedy,Degrado,Hardman,Teleha,Jaffee,Liu,Copeland,Covington,Christ,Trzaskos,Newton,Magolda,Wexler,Decicco
, p. 2636 - 2660 (2007/10/03)
To search for TNF-α (tumor necrosis factor α) converting enzyme (TACE) inhibitors, we designed a new class of macrocyclic hydroxamic acids by linking the P1 and P2′ residues of acyclic anti-succinate-based hydroxamic acids. A variety of residues including amide, carbamate, alkyl, sulfonamido, Boc-amino, and amino were found to be suitable P1 P1-P2′ linkers. With an N-methylamide at P3′, the 13-16-membered macrocycles prepared exhibited low micromolar activities in the inhibition of TNF-α release from LPS-stimulated human whole blood. Further elaboration in the P3′-P4′ area using the cyclophane and cyclic carbamate templates led to the identification of a number of potent analogues with IC50 values of ≤0.2 μM in whole blood assay (WBA). Although the P3′ area can accommodate a broad array of structurally diversified functional groups including polar residues, hydrophobic residues, and amino and carboxylic acid moieties, in both the cyclophane series and the cyclic carbamate series, a glycine residue at P3′ was identified as a critical structural component to achieve both good in vitro potency and good oral activity. With a glycine residue at P3′, an N-methylamide at P4′ provided the best cyclophane analogue, SL422 (WBA IC50 = 0.22 μM, LPS-mouse ED50 = 15 mg/kg, po), whereas a morpholinylamide at P4′ afforded the most potent and most orally active cyclic carbamate analogue, SP057 (WBAIC50 = 0.067 μM, LPS-mouse ED50 = 2.3 mg/kg, po). Further profiling for SL422 and SP057 showed that these macrocyclic compounds are potent TACE inhibitors, with Ki values of 12 and 4.2 nM in the porcine TACE assay, and are broad-spectrum MMP inhibitors. Pharmacokinetic studies in beagle dogs revealed that SL422 and SP057 are orally bioavailable, with oral bioavailabilities of 11% and 23%, respectively.
