The methylsulfonylethoxymethyl (Msem) as a hydroxyl protecting group in oligosaccharide synthesis
作者:Asghar Ali、Richard J.B.H.N. van den Berg、Herman S. Overkleeft、Gijsbert A. van der Marel、Jeroen D.C. Codée
DOI:10.1016/j.tet.2010.06.007
日期:2010.8
The methylsulfonylethoxymethyl (Msem) is introduced as a base-labile, non-participating protecting group in carbohydrate chemistry. Conditions to introduce the Msem on primary and secondary alcohols are described. Removal of the Msem is best achieved using a catalytic amount of tetrabutylammonium fluoride (TBAF), with or without a nucleophilic scavenger. Applicability of the Msem group is illustrated in the assembly of an all 1,3-cis-linked mannotrioside. (c) 2010 Elsevier Ltd. All rights reserved.