Tuneable regioselectivity during the mono-etherification of the 2,3-diol of a mannose derivative
作者:Sigthor Petursson、Sean M. Scully、Sigridur Jonsdottir
DOI:10.1016/j.carres.2014.02.016
日期:2014.3
The paper reports selective mono-etherification of the 2-, and 3-hydroxyl groups of methyl 4,6-O-isopropylidene-alpha-D-mannopyranoside using tin(II) chloride catalysed reactions of diaryldiazomethanes. By the use of different diazo compounds and the variation of the tin(II) chloride concentration the ether formation can be shifted from over 90% 3-selectivity to over 90% 2-selectivity. (C) 2014 Elsevier Ltd. All rights reserved.