中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
3,7,9-三氧杂三环[4.2.1.02,4]壬烷-5-醇 | 1,6:3,4-dianhydro-β-D-altropyranose | 3868-04-0 | C6H8O4 | 144.127 |
1,6:2,3-二酐-β-D-吡喃甘露糖 | 1,6:2,3-dianhydro-β-D-mannopyranose | 3868-03-9 | C6H8O4 | 144.127 |
—— | 1,6:2,3-dianhydro-β-D-allopyranose | 26423-96-1 | C6H8O4 | 144.127 |
1,6-脱水-β-D-葡萄糖 | levoglucosan | 498-07-7 | C6H10O5 | 162.142 |
The corresponding acetylated and free 2-O- and 4-O-glucosyl derivatives of dianhydrohexoses Ib - VIIb and Ic - VIIc have been obtained by the reactions of 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide (
Epoxide or pseudo-epoxide migration of 1,6:2,3-dianhydro- and 1,6:3,4-dianhydro-β-D-hexopyranoses was effected by treatment with aqueous sodium hydroxide or sodium iodide in acetone to give equilibrium mixtures. Various iodo derivatives of 1,6-anhydro-β-D-hexopyranoses were prepared as potential intermediates for pseudo-epoxide migration. NMR was used for following the reaction mechanism of epoxide and pseudo-epoxide migrations and analysis of reaction mixtures. Experimental data were compared with DFT calculations. Chair-boat equilibration of 1,6-anhydro-3-deoxy-3-halo-β-D-glucopyranoses was discussed.