The Conversion of Levoglucosenone into Isolevoglucosenone
作者:Xinghua Ma、Natasha Anderson、Lorenzo V. White、Song Bae、Warwick Raverty、Anthony C. Willis、Martin G. Banwell
DOI:10.1071/ch14574
日期:——
pair of compounds could be obtained by an initial Luche reduction of compound 1, electrophilic epoxidation of the resulting allylicalcohol 8 and oxidation of the product oxiranes 9 and 10. Independent treatment of compounds 3 and 4 with hydrazine then acetic acid followed by oxidation of the ensuing allylicalcohols finally afforded isolevoglucosenone (2). Details of the single-crystal X-ray analyses
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