The tandem chain extension aldol reaction used for synthesis of ketomethylene tripeptidomimetics targeting hPEPT1
摘要:
The rationale for targeting the human di-/tripeptide transporter hPEPT1 for oral drug delivery has been well established by several drug and prodrug cases. The aim of this study was to synthesize novel ketomethylene modified tripeptidomimetics and to investigate their binding affinity for hPEPT1. Three related tripeptidomimetics of the structure H-Phe-psi[COCH2]-Ser(Bz)-X-aa-OH were synthesized applying the tandem chain extension aldol reaction, where amino acid derived beta-keto imides were stereoselectively converted to alpha-substituted gamma-keto imides. In addition, three corresponding tripeptides, composed of amide bonds, were synthesized for comparison of binding affinities. The six investigated compounds were all defined as high affinity ligands (K-i-values < 0.5 mM) for hPEPT1 by measuring the concentration dependent inhibition of apical [C-14]Gly-Sar uptake in Caco-2 cells. Consequently, the ketomethylene replacement for the natural amide bond and alpha-side chain modifications appears to offer a promising strategy to modify tripeptidic structures while maintaining a high affinity for hPEPT1. (C) 2011 Elsevier Ltd. All rights reserved.
The invention relates to lysobactin amides and methods for their preparation, as well as their use for manufacturing medicaments for the treatment and/or prophylaxis of diseases, in particular bacterial infectious diseases.
Synthesis of Tetrapeptides Containing Dehydroalanine, Dehydrophenylalanine and Oxazole as Building Blocks for Construction of Foldamers and Bioinspired Catalysts
structure and additionally enables the introduction of non-typical side-chain substituents. Thus, such compounds could be buildingblocks for obtaining novel foldamers and/or artificial enzymes (artzymes). In this paper, effective synthetic procedures leading to such buildingblocks—tetrapeptides containing glycyldehydroalanine, glycyldehydrophenylalanine, and glycyloxazole subunits—are described. Peptides
[EN] The invention relates to lysobactin amides, methods for the production thereof, and the use thereof for producing medicaments utilized for treating and/or preventing diseases, particularly bacterial infectious diseases. [FR] L'invention concerne un lysobactinamide et son procédé de préparation, ainsi que son utilisation pour la production de médicaments destinés au traitement et/ou à la prophylaxie de maladies, en particulier de maladies infectieuses bactériennes. [DE] Die Erfindung betrifft Lysobactinamide und Verfahren zu ihrer Herstellung sowie ihre Verwendung zur Herstellung von Arzneimitteln zur Behandlung und/oder Prophylaxe von Krankheiten, insbesondere bakteriellen Infektionskrankheiten.