Formation of LacNAc mimetics employing novel donor substrates for enzymatic β1→4 galactosylation
作者:Saskia Weingarten、Joachim Thiem
DOI:10.1039/b400916a
日期:——
In examining C-6 modified 4-nitrophenyl β-D-galactopyranosides as donor structures the β-galactosidase (Bacillus circulans) revealed an unexpectedly broad substrate specificity which allowed successful syntheses of various disaccharide components.
reductive amination in the presence of NaBH3CN in DMSO. When methyl α-D- and p-nitrophenyl α- and β-D-galacto-hexodialdo-1,5-pyranosides (1, 2 and 3, respectively) were used as substrates, 6-(β-cyclodextrinylamino)-6-deoxy-D-galactopyranosides were obtained in 25−50% yields. The same was true in the cases of 6II-oxolactose 4 and of 6II-oxomelibiose 5, for which the anomeric carbon was shown to be unreactive
Facile Formation of Novel Carbohydrate-AminoAcid Conjugates by Reductive Amination
作者:Joachim Thiem、Saskia Weingarten
DOI:10.1055/s-2003-39299
日期:——
Coupling of amino acids with aldehyde functionalised carbohydrate derivatives by reductive amination led to novel carbohydrate-amino acid conjugates.
通过还原胺化法使氨基酸与醛功能化的碳水化合物衍生物结合,从而产生新型碳水化合物-氨基酸缀合物。
Synthesis of Novel Di- and Trisaccharide Mimetics with Non-Glycosidic Amino Bridges
作者:Janna Neumann、Saskia Weingarten、Joachim Thiem
DOI:10.1002/ejoc.200600958
日期:2007.3
Synthesis of novel di- and trisaccharides using enzymatic glycosylation, Dess–Martin oxidation and reductive amination allows rapid access to the target structures. Thus, a novel class of glycomimetics was obtained having nitrogen inserted as bridging atom between two non-anomeric positions. Novel di- and trisaccharide mimetics were designed using N-acetylglucosamine as a basis structure. A third monosaccharide