In(OTf)<sub>3</sub>—A New Efficient Lewis Acid Catalyst for Stereoselective C-Glycosylation Reactions of Glycal Derivatives
作者:Rina Ghosh、Arijit Chakraborty、Dilip K. Maiti
DOI:10.1081/scc-120018923
日期:2003.1.6
A variety of glycal derivatives reacted smoothly with allyltrimethylsilane and trimethylsilylcyanide in neat condition as well as in dichloromethane in the presence of 2-5 mol% of In(OTf)(3) affording the corresponding 2,3-unsaturated C-glycosides in excellent yields and moderate to excellent alpha-selectivities.
Synthesis of 2,3-unsaturated C-glycosides by HClO4–SiO2 catalyzed Ferrier rearrangement of glycals
Alkyl 2,3-unsaturated C-glycopyranosides have been prepared by Ferrier rearrangement of acyl or alkyl protected glycals catalyzed by HClO4-SiO2. (c) 2005 Elsevier Ltd. All rights reserved.
Mild and Highly Efficient Stereoselective Synthesis of 2,3‐Unsaturated Glycopyranosides using La(NO<sub>3</sub>)<sub>3</sub> · 6H<sub>2</sub>O as a Catalyst: Ferrier Rearrangement
A mild and highly efficient stereoselective reaction of 3,4,6-tri-O-acetyl-D-glucal with a variety of nucleophiles, viz. alcohols, phenols, thiols, thiophenols, and allyl trimethyl silane (TMS), in the presence of 5 mol% of lanthanum(III) nitrate hexahydrate under solvent-free conditions yielded the corresponding 2,3-unsaturated glycopyranosides (pseudoglycals) in excellent yields.
ICHIKAWA, YOSHIYASU;ISOBE, MINORU;GOTO, TOSHIO, TETRAHEDRON, 43,(1987) N 20, 4749-4758