anomeric activation of acetylated glycosyl iodides. This reactivity can be exploited for straightforward access to allyl glycosides unprotected at the O-2 position. The reported protocol appears to be convenient in comparison with the pre-existing ones in that shorter experimental times are needed and the use of strong acids is avoided. Suitable structural features of substrates (6-deoxy sugars or use
Gas Chromatographic Investigation of the Boron Trifluoride Etherate-Induced Formation and Anomerization of Glucopyranosides
作者:Ulf Ellervik、Karl Jansson、Göran Magnusson
DOI:10.1080/07328309808002351
日期:1998.5.1
Boron trifluoride etherate-induced glucosylation of methanol, 1-propanol, 2-propanol, 2-bromoethanol, and 3-bromo-2-(bromomethyl)propan-1-ol, using 1,2,3,4,6-penta-O-acetyl-beta-D-glucopyranose as donor, gave the corresponding beta-glucopyranosides. The alpha-glucosides and 1,2,3,4,6-penta-O-acetyl-alpha-D-glucopyranose were formed as byproducts in varying amounts, according to GLC analysis. The propensity of the different glucopyranosides to anomerize was determined in separate experiments.