Mitsunobu reaction of 1,5-anhydro-3,4,6-tri-O-benzyl-2-deoxy-2-hydroxymethyl-hex-1-enitols and 1,5-anhydro-2-deoxy-4,6-O-protected-hex-1-enitols. A novel method for the synthesis of 2-C-methylene glycosides and an useful alternative to Ferrier rearrangement
作者:Namakkal G. Ramesh、Kalpattu K. Balasubramanian
DOI:10.1016/0040-4020(94)00939-r
日期:1995.1
A simple and convenient method for the synthesis of aryl-3,4,6-tri-O-benzyl-2-deoxy-2-methylene-hexopyranosides 5,6 and 7, glycosides which are not accessible by the conventional Ferrier rearrangement, has been described based on the Mitsunobu reaction of alcohols 3 and 4 with substituted phenols. The anomeric configurations of glycosides 5 and 6 were established by detailed NOE studies. The reaction
Palladium-Catalyzed Stereoselective Formation of α-<i>O</i>-Glycosides
作者:Brandon P. Schuff、Gregory J. Mercer、Hien M. Nguyen
DOI:10.1021/ol071268z
日期:2007.8.1
[GRAPHICS]A novel method for palladium-catalyzed stereoselective formation of alpha-O-glycosides has been developed. This strategy relies on the palladium-biaryl phosphine catalyst-glycal donor complexation to control the anomeric selectivity. It does not depend on the nature of the protecting groups on the substrates, thus eliminating the need for cumbersome protecting group manipulations.