Iodine: A versatile reagent in carbohydrate chemistry II. Efficient chemospecific activation of thiomethylglycosides
作者:K.P. Ravindranathan Kartha、Mahmoud Aloui、Robert A. Field
DOI:10.1016/0040-4039(96)01029-5
日期:1996.7
Iodine has been found to be an efficient promoter in the alcoholysis of unprotected or fully benzylated methyl 1-thio-β-D-galactopyranoside. Stereoselective formation of 1,2-cis linkages in oligosaccharide synthesis using “armed” thiomethyl glycosides as glycosyl donors was also observed. Protecting groups such as acetate, benzoate, benzylidene, isopropylidene, trimethylsilylethyl etc are stable under
A simple, mild, and regioselective method for the benzylation of carbohydrate derivatives promoted by silver carbonate
作者:Satish Malik、Vaibhav A. Dixit、Prasad V. Bharatam、K.P. Ravindranathan Kartha
DOI:10.1016/j.carres.2009.12.012
日期:2010.3
A simple, mild, and regioselective method has been developed for the selective benzylation and p-methoxybenzylation of carbohydrate derivatives in high yields using Ag2CO3 as the promoter. Benzylation of base-labile substrates, for which other reported methods are of little use, has been performed in high yields. (C) 2010 Elsevier Ltd. All rights reserved.