Environmentally Benign Synthesis of 2,3-Unsaturated Glycopyranosides in Task-Specific Ionic Liquid
作者:Goutam Guchhait、Anup Kumar Misra
DOI:10.1007/s10562-011-0646-7
日期:2011.7
A green reaction condition has been developed for the synthesis of 2,3-unsaturatedglycopyranosides by the Ferrier rearrangement of glycals using alcohols and thiols in 1-butyl-3-methylimidazolium trifluoromethanesulfonate ([BMIM]·OTf) in excellent yield. [BMIM]·OTf has been applied as a task specific ionic liquid organo-catalyst. Operational simplicity, environmentally benign reaction condition, use
A simple procedure for the synthesis of 2,3-unsaturated glycosides in acetonitrile and tetrahydropyranylation of alcohols and phenols in dichloromethane in the presence of 3,5-dinitrobenzoicacid is described. A variety of alcohols and thiols are reacted with glycals to give the desired products in high yields with high α-selectivity.
Alkyl 2,3-unsaturatedglycopyranosides have been prepared by the Ferrier rearrangement of acetyl protected glycals catalyzed by HClO 4 -SiO 2 . Operational simplicity, use of economically convenient catalyst, mild reaction conditions, high yields, short reaction times are the key features of this protocol.
Gold(III) Chloride and Phenylacetylene: A Catalyst System for the Ferrier Rearrangement, and<i>O</i>-Glycosylation of 1-<i>O</i>-Acetyl Sugars as Glycosyl Donors
作者:Rashmi Roy、Parasuraman Rajasekaran、Asadulla Mallick、Yashwant D. Vankar
DOI:10.1002/ejoc.201402606
日期:2014.9
have developed a new catalystsystem comprising AuCl3 and phenylacetylene that promotes the Ferrierrearrangement of glycals and 2-acetoxymethylglycals with different nucleophiles, and also the O-glycosylation of 1-O-acetylsugars to obtain a variety of useful glycosides at room temperature through relay catalysis. Good anomeric selectivity was observed for the Ferrierrearrangements, whereas the O-glycosylation
Synthesis of 2,3-Unsaturated O- and N-Glycosides by HBF4˙SiO2-Catalyzed Ferrier Rearrangement of d-Glycals
作者:Pedro Colinas、Oscar Rodríguez、Rodolfo Bravo
DOI:10.1055/s-0028-1088105
日期:2009.4
Fluoroboronic acid adsorbed on silica gel (HBF4ËSiO2) catalyzes the Ferrier rearrangement of per-O-acetylated glycals with alcohols and sulfonamides to give 2,3-unsaturated O- and N-glycosides in good to excellent yield and with high α-stereoselectivity.