manno- versus gluco-Selectivity in reductions of 2-keto-β-d-arabino-hexopyranosides
摘要:
Tri-sec-butylborohydrides (L- or K-Selectride) reduce the carbonyl group in acylated 2-keto-beta-D-arabino-hexopyranosides to beta-D-mannosides in an essentially stereospecific fashion, whereas borane reduction gives the 2-epimeric beta-D-glucosides with high preference. As preparative yields are in the 70-85% range, the ulosyl donor approach can thus be utilized for the straightforward construction of oligosaccharides containing either beta-D-Man or beta-D-Glc units. (C) 2003 Elsevier Science Ltd. All rights reserved.
manno- versus gluco-Selectivity in reductions of 2-keto-β-d-arabino-hexopyranosides
摘要:
Tri-sec-butylborohydrides (L- or K-Selectride) reduce the carbonyl group in acylated 2-keto-beta-D-arabino-hexopyranosides to beta-D-mannosides in an essentially stereospecific fashion, whereas borane reduction gives the 2-epimeric beta-D-glucosides with high preference. As preparative yields are in the 70-85% range, the ulosyl donor approach can thus be utilized for the straightforward construction of oligosaccharides containing either beta-D-Man or beta-D-Glc units. (C) 2003 Elsevier Science Ltd. All rights reserved.
manno- versus gluco-Selectivity in reductions of 2-keto-β-d-arabino-hexopyranosides
作者:Frieder W. Lichtenthaler、Matthias Lergenmüller、Siegfried Peters、Zsolt Varga
DOI:10.1016/s0957-4166(03)00028-4
日期:2003.3
Tri-sec-butylborohydrides (L- or K-Selectride) reduce the carbonyl group in acylated 2-keto-beta-D-arabino-hexopyranosides to beta-D-mannosides in an essentially stereospecific fashion, whereas borane reduction gives the 2-epimeric beta-D-glucosides with high preference. As preparative yields are in the 70-85% range, the ulosyl donor approach can thus be utilized for the straightforward construction of oligosaccharides containing either beta-D-Man or beta-D-Glc units. (C) 2003 Elsevier Science Ltd. All rights reserved.