Microwave-induced, Montmorillonite K10-catalyzed Ferrier rearrangement of tri-O-acetyl-d-galactal: mild, eco-friendly, rapid glycosidation with allylic rearrangement
摘要:
Montmorillonite K10 was found to catalyze, under microwave irradiation, rapid O-glycosidation of 3,4,6-tri-O-acetyl-D-galactal to afford exclusively the alkyl and aryl 2,3-dideoxy-D-threo-hex-2-enopyranosides with very high alpha-selectivity and without the formation of the 2-deoxy-D-lyxo-hexopyranosides. Under these conditions, 3,4,6-tri-O-acetyl-D-glucal as usual also underwent the Ferrier rearrangement. (C) 2002 Elsevier Science Ltd. All rights reserved.
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.