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
Ring-opening of oxazolines derived from l-serine: a short and efficient stereoselective synthesis of all four diastereomers of 3-mercaptoaspartic acid derivatives
for accessing four diastereomerically pure 3-mercaptoaspartic acid derivative from l-aspartic acid. In our synthesis, ring-opening reactions of oxazoline-4,5-dicarboxylate with thiolacetic acid as well as the stereochemical interconversion of both α- and β-configuration via oxazoline chemistry were utilized as key steps.
This paper reports the totalsynthesis of antibacterial cyclic hexapeptides nicrophorusamides A () and B (), isolated from the actinomycete strain UTG9 belonging to the genus . The synthesis involved solid-phase peptide elongation and solution-phase macrolactamization, followed by the removal of the protecting groups. Synthetic and demonstrated inhibitory effects on the growth of with minimum inhibitory