Stereochemistry and Conformation of Skyllamycin, a Non-Ribosomally Synthesized Peptide from<i>Streptomyces</i>sp. Acta 2897
作者:Vivien Schubert、Florent Di Meo、Pierre-Loïc Saaidi、Stefan Bartoschek、Hans-Peter Fiedler、Patrick Trouillas、Roderich D. Süssmuth
DOI:10.1002/chem.201304562
日期:2014.4.22
Skyllamycin is a non‐ribosomally synthesized cyclic depsipeptide from Streptomyces sp. Acta2897 that inhibits PDGF‐signaling. The peptide scaffold contains an N‐terminal cinnamoyl moiety, a β‐methylation of aspartic acid, three β‐hydroxylated amino acids and one rarely occurring α‐hydroxy glycine. With the exception of α‐hydroxy glycine, the stereochemistry of the amino acids was assigned by comparison
An efficient approach to d-threo-3-hydroxyaspartic acid for the synthesis of novel l-threo-oxazolines as selective blockers of glutamate reversed uptake
作者:Meri De Angelis、Giuseppe Campiani
DOI:10.1016/j.tetlet.2004.01.081
日期:2004.3
d-threo-3-hydroxyaspartic acid was developed. Starting from l-(2S,3S)-N-benzoyl-3-hydroxyaspartic acid dimethyl ester by a Deoxo-fluor-catalyzed cyclizationreaction, an inversion of configuration at the β-center (erythro isomer), was observed. A base-induced epimerization reaction led to the d-trans-isomer, which was hydrolyzed to give d-threo-3-hydroxyaspartic acid with excellent stereoselectivity and overall
experiments on column chromatography of the opticallyactive resin containing L-lysine or L-or nithine were carried out with pyridinium acetate and ammonium acetate solvent systems as the eluents. threo-β-liydroxy-DL-aspartic acid was found to be resolved on the opticallyactive resin containing L-lysine with ammonium acetate solvent system; erythro-β-hydroxy-DL-aspartic acid could be resolved on that containing
Total Synthesis and Biological Evaluation of Rakicidin A and Discovery of a Simplified Bioactive Analogue
作者:Michail Tsakos、Lise L. Clement、Eva S. Schaffert、Frank N. Olsen、Sebastiano Rupiani、Rasmus Djurhuus、Wanwan Yu、Kristian M. Jacobsen、Nikolaj L. Villadsen、Thomas B. Poulsen
DOI:10.1002/anie.201509926
日期:2016.1.18
We report a concise asymmetric synthesis of rakicidin A, a macrocyclic depsipeptide that selectively inhibits the growth of hypoxic cancer cells and stem‐like leukemia cells. Key transformations include a diastereoselective organocatalytic cross‐aldol reaction to build the polyketide portion of the molecule, a highly hindered ester fragment coupling reaction, an efficient Helquist‐type Horner—Wadsworth—Emmons