PhBCl2 promoted reductive opening of 2′,4′-O-p-methoxybenzylidene: new regioselective differentiation of position 2′ and 4′ of α-l-iduronyl moieties in disaccharide building blocks
作者:Anna Dilhas、David Bonnaffé
DOI:10.1016/j.tetlet.2004.03.046
日期:2004.4
We describe a new protocol for the challenging differentiation of the position 2' and 4' of L-iduronyl moieties located at the nonreducing end of various disaccharide building blocks. This methodology is based on the introduction of a 2',4'-O-p-methoxybenzylidene group, followed by a totally regioselective reductive opening of this acetal by the PhBCl2/Et3SiH reagent system, L-Iduronyl moieties protected by a 4'-O-p-methoxybenzyl group were thus obtained regioselectively and efficiently. (C) 2004 Elsevier Ltd. All rights reserved.