Commercially available zinc dust in the presence of ammonium chloride in acetonitrile at reflux removes the 2,2,2-trichloroethyl (ICE) group at anomeric centers with excellent yields (>95%) in short reaction times. This present method is easily implemented on substrates containing acyl and benzyl groups and large-scale reactions also proceed in high yield. (C) 2011 Elsevier Ltd. All rights reserved.
A Novel and Efficient Deprotection of the Allyl Group at the Anomeric Oxygen of Carbohydrates
作者:Biao Yu、Jianbo Zhang、Shoufu Lu、Yongzheng Hui
DOI:10.1055/s-1998-1579
日期:1998.1
Perfluoroalkylation with perfluoroalkyl iodide under sodium dithionite and sodium bicarbonate in acetonitrile/water followed by elimination in the presence of zinc powder and ammonium chloride in ethanol was disclosed to be an extremely mild and efficient procedure for deprotection of the anomeric allyl group of carbohydrates.