Non-natural aldofuranosides as substrates of a β-glucosidase
摘要:
Based on glycosidase inhibitory activities of some known 1,4-iminoalditols, four aldofuranosides, (4-nitro)phenyl beta-D-glucofuranoside, -beta-D-galactofuranoside, -alpha-L-idofuranoside and -alpha-L-altrofuranoside, were identified as possible substrates of glucosidases and galactosidases. Three of them were found to be accepted by the beta-glucosidase from Agrobacterium sp. (C) 2004 Elsevier Ltd. All rights reserved.
Glucofuranosylation with penta-O-propanoyl-β-d-glucofuranose
作者:Richard H. Furneaux、Bénédicte Martin、Phillip M. Rendle、Carol M. Taylor
DOI:10.1016/s0008-6215(02)00300-2
日期:2002.11
be a suitable glycosylating agent for the acid-catalysed, directsynthesis of O-, S- and N-glucofuranosyl compounds. Beta-linked products are formed with good selectivity. Reaction with cyanotrimethylsilane gave the 1,2-O-(1-cyanopropylidene)acetal rather than the C-glycosyl cyanide. By selective acid-catalysed hydrolysis, the title compound was converted to the 1-hydroxy analogue from which the trichloroacetimidates
An original chemoenzymatic route for the synthesis of β-d-galactofuranosides using an α-l-arabinofuranosidase
作者:Caroline Rémond、Richard Plantier-Royon、Nathalie Aubry、Michael J. O’Donohue
DOI:10.1016/j.carres.2005.01.016
日期:2005.3
Galactofuranose is a widespread component of cell wall polysaccharides in bacteria, protozoa and fungi, but is totally absent in mammals. Importantly, galactofuranose is a key constituent of major cell envelope polysaccharides in pathogenic mycobacteria. In this respect, galactofaranose-based glycoconjugates are interesting target molecules for drug design. O-Glycosidases and notably beta-D-galactofuranosidases could be useful tools for the chemoenzymatic synthesis of galacto furano sides, but to date no studies of this type have been reported. Here we report the use of a GH 51 alpha-L-arabinofuranosidase for the synthesis Of beta-D-galactofuranosides. We have demonstrated that this enzyme can catalyse both the autocondensation of p-nitrophenyl-beta-D-galactofuranoside and the transgalactofuranosylation of benzyl alpha-D-xylopyranoside, forming p-nitrophenyl beta-D-galactofuranosyl-(1 -> 2)beta-D-galactofuranoside and benzyl beta-D-galactofuranosyl-(1 -> 2)-alpha-D-xylopyranoside, respectively. Both reactions were very regiospecific and the reaction involving benzyl alpha-D-xylopyranoside afforded very high yields (74.8%) of the major product. To our knowledge, this demonstration of chemoenzymatic synthesis of galactofuranosides constitutes the very first use of an O-glycosidase for the synthesis of galactofuranosides. (c) 2005 Elsevier Ltd. All rights reserved.
US6620921B1
申请人:——
公开号:US6620921B1
公开(公告)日:2003-09-16
[EN] GLUCOFURANOSES<br/>[FR] GLUCOFURANOSES
申请人:IND RES LTD
公开号:WO2001036435A1
公开(公告)日:2001-05-25
A β-D-glucofuranose compound which is 1,2,3,5,6-penta-O-propanoyl-β-D-glucofuranose, preferably in crystalline form, is prepared from D-glucose. The compound is prepared by reacting D-glucose with boric acid, or an equivalent thereof, followed by treatment with a propanoylating reagent, preferably propanoic anhydride. The compound is useful for the preparation of other compounds, such as glucofuranosides.
Non-natural aldofuranosides as substrates of a β-glucosidase
作者:Andreas Tauss、Peter Greimel、Karen Rupitz、Andreas J. Steiner、Arnold E. Stütz、Stephen G. Withers、Tanja M. Wrodnigg
DOI:10.1016/j.tetasy.2004.11.027
日期:2005.1
Based on glycosidase inhibitory activities of some known 1,4-iminoalditols, four aldofuranosides, (4-nitro)phenyl beta-D-glucofuranoside, -beta-D-galactofuranoside, -alpha-L-idofuranoside and -alpha-L-altrofuranoside, were identified as possible substrates of glucosidases and galactosidases. Three of them were found to be accepted by the beta-glucosidase from Agrobacterium sp. (C) 2004 Elsevier Ltd. All rights reserved.