Stereoselective <i>C</i>-Glycoside Formation with 2-<i>O</i>-Benzyl-4,6-<i>O</i>-benzylidene Protected 3-Deoxy Gluco- and Mannopyranoside Donors: Comparison with <i>O</i>-Glycoside Formation
作者:Myriame Moumé-Pymbock、David Crich
DOI:10.1021/jo3011655
日期:2012.10.19
mannopyranosyl thioglycosides is highly stereoselective providing the α-C-glycosides in the gluco-series and the β-C-glycosides in the manno-series. Conformational analysis of nucleophilic attack of putative intermediate glycosyl oxocarbenium ions suggests that the observed selectivities for C-glycoside formation can be explained by preferential attack on the opposite face of the oxocarbenium to the C2–H2