Stereoselective glycosylation of d-galactals by diethyl phosphorochloridite- and AlCl3-assisted Ferrier rearrangement
作者:Yen-Bo Chen、Su-I. Wang、Zi-Ping Lin、Chun-Hung Lin、Min-Tsang Hsieh、Hui-Chang Lin
DOI:10.1016/j.tet.2014.11.027
日期:2015.1
α-2,3-Unsaturated galactosides were synthesized in good to excellent yields by the initial activation of d-galactals with diethyl phosphorochloridite and the subsequent glycosyl addition via Ferrier rearrangement with various O-nucleophiles in the presence of AlCl3. The two-step reactions were carried out in one-pot and finished within 60 min in 81–95% yield to give the glycoside products with excellent
Direct Ferrier rearrangement on unactivated glycals catalyzed by indium(III) chloride
作者:Paramathevar Nagaraj、Namakkal G. Ramesh
DOI:10.1016/j.tetlet.2009.04.084
日期:2009.7
Anhydrous InCl3 has been shown to efficiently catalyze the Ferrier rearrangement by a direct allylic substitution of the hydroxyl group at C-3 position of glycals to afford the corresponding 2,3-unsaturated glycosides in high yields at ambient temperature. This methodology obviates the need for protecting and/or activating the C-3 hydroxyl group of glycals. The reaction works in equal ease with both