A series of chiral beta(3)-aminoxy acids or amides with various side chains have been synthesized via two different approaches. One is the Arndt-Eistert homologation approach, using chiral alpha-aminoxy acids as starting materials. The other approach, utilizing the enantioselective reduction of beta-keto esters catalyzed by baker's yeast or chiral Ru(II) complexes, produces chiral beta(3)-aminoxy acids with nonproteinaceous side chains. The oligomers of beta(3)-aminoxy acids can be readily prepared using EDCI/HOAt as the coupling reagent.
A compound of the formula (I): wherein each symbol is as defined in the DESCRIPTION, or a pharmaceutically acceptable salt thereof has a superior inhibitory activity on cancer cell proliferation.
A compound of the formula (I): wherein each symbol is as defined in the DESCRIPTION, or a pharmaceutically acceptable salt thereof has a superior Notch signal transduction inhibitory action, and is useful for preventing or treating various diseases involving Notch signal transduction.
α-Aminoxy Oligopeptides: Synthesis, Secondary Structure, and Cytotoxicity of a New Class of Anticancer Foldamers
作者:Daniela Diedrich、Ana J. Rodrigues Moita、Anja Rüther、Benedikt Frieg、Guido J. Reiss、Astrid Hoeppner、Thomas Kurz、Holger Gohlke、Steffen Lüdeke、Matthias U. Kassack、Finn K. Hansen
DOI:10.1002/chem.201602521
日期:2016.12.5
secondary structure with increasing pH. The most cytotoxic α‐aminoxy peptides have an increased propensity to take up a 28‐helical conformation in the presence of a model membrane. This indicates a correlation between the 28‐helical conformation and the membranolytic activity observed in mode of action studies, thereby providing novel insights in the folding properties and the biological activity of α‐aminoxy
Chiral alpha -aminoxy acids of various side chains were synthesized with high optical purity starting from chiral alpha -amino acids. The conformations of diamides 13a-e, 15, and 16 were probed by using NMR, FT-IR, and CD spectroscopic methods as well as X-ray crystallography. The right-handed turns with eight-membered-ring intramolecular hydrogen bonds between adjacent residues (called the N-O turns) were found to be preferred for D-aminoxy acid residues, and they were independent of the side chains. The rigid chiral N-O turns should have great potential in molecular design.