15961-56-5Relevant articles and documents
Phosphorylase-catalyzed N-formyl-α-glucosaminylation of maltooligosaccharides
Kawazoe, Satoshi,Izawa, Hironori,Nawaji, Mutsuki,Kaneko, Yoshiro,Kadokawa, Jun-ichi
experimental part, p. 631 - 636 (2010/09/20)
This paper describes the phosphorylase-catalyzed enzymatic N-formyl-α-glucosaminylation of maltooligosaccharides for direct incorporation of 2-deoxy-2-formamido-α-d-glucopyranose units into maltooligosaccharides. When the reaction of 2-deoxy-2-formamido-α-d-glucopyranose-1-phosphate (GlcNF-1-P) as the glycosyl donor and maltotetraose as a glycosyl acceptor was performed in the presence of phosphorylase, the N-formyl-α-d-glucosaminylated pentasaccharide was produced, as confirmed by MALDI-TOF MS. Furthermore, the glucoamylase-catalyzed reaction of the crude products supported that the 2-deoxy-2-formamido-α-d-glucopyranoside unit was positioned at the non-reducing end of the pentasaccharide. The pentasaccharide was isolated from the crude products and its structure was further determined by the 1H NMR analysis. On the other hand, when the phosphorylase-catalyzed reactions of maltotriose and maltopentaose using GlcNF-1-P were conducted, no N-formyl-α-glucosaminylation took place in the former system, whereas the latter system gave N-formyl-α-d-glucosaminylated oligosaccharides with various degrees of polymerization. These results could be explained by the recognition behavior of phosphorylase toward maltooligosaccharides.
Reactions of Relevance to the Chemistry of Aminoglycoside Antibiotics. Part 14. A Useful Radical-deamination Reaction
Barton, Derek H. R.,Bringmann, Gerhard,Lamotte, Genevieve,Motherwell, William B.,Motherwell, Robyn S. Hay,Porter, Alexander E. A.
, p. 2657 - 2664 (2007/10/02)
Primary, secondary, and tertiary aliphatic or alicyclic isocyanides are smoothly reduced under radical conditions using tri-n-butylstannane to the corresponding hydrocarbons.The relative ease of reduction is tertiary > secondary > primary.Aromatic isocyanides are not reduced under these conditions.The reduction of isothiocyanates (or isoselenocyanates) by tri-n-butylstannanae also affords hydrocarbons, but here the isocyanides have been shown to be intermediates.The reduction of a compound with isocyanide and xanthate functions in a 1,2-relationship gives a smooth radical fragmentation to furnish an olefin.An efficient synthesis of 2-deoxy-D-glucose starting with glucosamine is described.
