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.
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.
Niobium(V) chloride catalyzed microwave assisted synthesis of 2,3-unsaturated O-glycosides by the Ferrier reaction
作者:Srinivas Hotha、Ashish Tripathi
DOI:10.1016/j.tetlet.2005.05.015
日期:2005.7
NbCl5 catalyzes the Ferrier reaction of per-O-acetylated glycals with primary, secondary, allylic, benzylic and monosaccharide alcohols to give 2,3-unsaturated α-glycosides in short reaction times under microwave irradiation conditions.