Aspergillus niger alpha-glucosidase (ANGase) was used for an efficient syntheses of alkyl alpha-D-2-deoxyglucosides (A2DGs) and for regioselectivity studies of alkoxy-hydro additions Of D-glucal in the presence of alkyl alcohols. ANGase showed a high stability with respect to the high concentration of alkyl alcohols. The reaction conditions were optimized for pH, temperature, alkyl alcohol concentration, and D-glucal concentration. On the basis of MS and NMR analyses, A2DGs were confirmed to have only an alpha-2deoxyglucosidic bond and the two-dimensional NMR (HMBC) spectra showed to be made up of 2-deoxyglucosyl and alkyl moieties. (C) 2004 Elsevier Ltd. All rights reserved.
A mild and simple enzymic conversion of aldono- and aldurononitriles into the corresponding amides and/or carboxylic acids
作者:Anna de Raadt、Herfried Griengl、Norbert Klempier、Arnold E. Stuetz
DOI:10.1021/jo00063a048
日期:1993.5
Solvolyses of 2-Deoxy-α- and β-<scp>d</scp>-Glucopyranosyl 4‘-Bromoisoquinolinium Tetrafluoroborates
作者:Jiang Zhu、Andrew J. Bennet
DOI:10.1021/jo0004106
日期:2000.7.1
state charge delocalization onto the ring oxygen atom. Analysis of the solvolysis product ratios indicates that the 2-deoxyglucosyl oxacarbenium ion is not solvent-equilibrated in the solvent mixtures studied. In the solvolysis of compound 1, the solvent trifluoroethanol facilitates diffusional separation of the leaving group and, in so doing, promotes the formation of the retained trifluoroethyl glycoside