Direct vinylation of glucose derivatives with acetylene
摘要:
Vinyl ethers, promising chiral carbohydrate synthons, have been synthesized by the addition of glucose acetals (1,2: 5,6-di-O-isopropylidene-alpha-D-glucofuranose, methyl 4,6-O-benzylidene-alpha-D-glucopyranoside, 1,2-O-cyclohexylidene-alpha-D-glucofuranose, methyl alpha-D-glucopyranoside) to acetylene under atmospheric and elevated pressures in an autoclave in the presence of superbase catalytic systems (KOH-DMSO, t-BuOK-DMSO). The complete vinylation of 1,2: 5,6-di-O-isopropylidene-alpha-D-glucofuranose and methyl alpha-D-glucopyranoside has been realized under elevated pressure of acetylene in the system KOH-THF as well. (c) 2007 Elsevier Ltd. All rights reserved.