From methyl mannosides to methyl octosides by a stepwise homologation with Grignard C1 reagents
作者:Halszka Stępowska、Aleksander Zamojski
DOI:10.1016/s0008-6215(01)00103-3
日期:2001.6
A four-step procedure for homologation of methyl alpha-D-mannofuranoside and alpha-D-mannopyranoside was examined. The reactions consisted in (i) oxidation of the terminal hydroxymethyl group in a protected sugar derivative to an aldehyde; (ii) reaction with allyloxymethylmagnesium chloride (or (phenyldimethyl)silylmethyl-magnesium chloride); (iii) protection of the newly formed secondary alcohol group;