Regioselective C-3-O-acylation and O-alkylation of 4,6-O-benzylidene-β-d-glucopyranoside, derivatives displaying a range of anomeric substituents
摘要:
Regioselective C-3-O-acylation and O-alkylation of ethyl 4,6-O-benzylidene-1-thio-beta-D-glucopyranoside, phenyl 4,6-O-benzylidene-beta-D-glucopyranoside and phenyl 4,6-O-benzylidene-1-seleno-beta-D-glucopyranoside is described. Regioselectivity is obtained by first treating the benzylidene diols with sodium hydride and copper (II) chloride to form a THF soluble copper chelate. (C) 1999 Elsevier Science Ltd. All rights reserved.
Regioselective C-3-O-acylation and O-alkylation of 4,6-O-benzylidene-β-d-glucopyranoside, derivatives displaying a range of anomeric substituents
作者:Jonathan J. Gridley、Helen M.I. Osborn、William G. Suthers
DOI:10.1016/s0040-4039(99)01420-3
日期:1999.9
Regioselective C-3-O-acylation and O-alkylation of ethyl 4,6-O-benzylidene-1-thio-beta-D-glucopyranoside, phenyl 4,6-O-benzylidene-beta-D-glucopyranoside and phenyl 4,6-O-benzylidene-1-seleno-beta-D-glucopyranoside is described. Regioselectivity is obtained by first treating the benzylidene diols with sodium hydride and copper (II) chloride to form a THF soluble copper chelate. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis of disaccharides containing α-linked GlcNAc or β-linked ManNAc units
作者:Michael G.B Drew、Seth C Ennis、Jonathan J Gridley、Helen M.I Osborn、David G Spackman
DOI:10.1016/s0040-4020(01)00760-8
日期:2001.9
The synthesis of disaccharidescontaining α-linked GlcNAc or β-linked ManNAc units from shelf-stable, and yet highly reactive, 2-oximinoglycosyl donors is described. Access to a preponderance of the disaccharidescontaining either the α-linked GlcNAc or β-linked ManNAc unit can be obtained by careful choice of solvent and glycosidation conditions.
Regioselective C-3-O-acylation and O-methylation of 4,6-O-benzylidene-β-d-gluco- and galactopyranosides displaying a range of anomeric substituents
作者:Helen M.I Osborn、Victoria A Brome、Laurence M Harwood、William G Suthers
DOI:10.1016/s0008-6215(01)00063-5
日期:2001.5
The regioselective C-3-O-acylation and O-methylation of a range of 4,6-O-benzylidene-beta -D-gluco- and galactopyranosides has been studied. Regioselectivity is achieved by forming the copper chelate of the 2,3-diol using either sodium hydride and copper(II) chloride, or copper(II) acetylacetanoate, or copper(II) acetate, prior to introduction of the acylating or methylating agent. (C) 2001 Elsevier Science Ltd. All rights reserved.