A synthesis of 3-deoxy-D-gluco-oct-2-ulosonic acid
摘要:
Acyclic 2:3,5:6- and 3:4,5:6-di-O-isopropylidene-D-glucoses have been converted by four reactions involving a Wittig chain homologation, a catalytic hydrogenation, an acid hydrolysis and an acetonation into 2,3-dideoxy-5:6,7:8-di-O-isopropylidene-D-gluco-octono-1,4-lactone which underwent a Wasserman reaction and then a hydrolysis to yield 3-deoxy-D-gluco-oct-2-ulosonic acid, isolated as its ammonium salt 2.
A synthesis of 2-deoxy-3-0-methyl-1,4-aldonolactones
作者:F.J. Lopez Herrera、M.S. Pino Gonzalez
DOI:10.1016/s0040-4020(01)96089-2
日期:1986.1
aldehyde sugars 1, (free or in lactol form), reacted with methyl hydrogen malonate to give α,β-unsaturated esters 2. In the case of lactols, the R group in 2 is not identical to the R in 1 (epimerisation occurs). Base-catalysed addition of methanol to the esters 2, afforded the epimeric ethers 3, acid hydrolisis of which yielded the 2-deoxy-3-0-methyl-1,4-aldonolactones 4. Degradation of the sugar chain