| 中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
|---|---|---|---|---|
| —— | 6-(4'-O-acetyl-3'-azido-2',3',6'-trideoxy-β-D-arabino-hexopyranosyl)-3-bromo-4-hydroxy-1,5-dimethoxynaphthalene | 613661-19-1 | C20H22BrN3O6 | 480.315 |
| —— | 6-(3'-amino-2',3',6'-trideoxy-β-D-arabino-hexopyranosyl)-3-bromo-1,4,5-trimethoxynaphthalene | 613661-20-4 | C19H24BrNO5 | 426.307 |
In connection with studies directed towards the synthesis of the pyranonaphthoquinone antibiotic medermycin, C-aryl glycosides were prepared by C-glycosylation of naphthols with glycosyl donors. Boron trifluoride diethyl etherate proved to be a suitable Lewis acid to promote the C-glycosylation, and use of the azido glycosyl donor proved more successful than using the dimethylamino glycosyl donor. 5-Hydroxy-1,4-dimethoxynaphthalene underwent facile C-glycosylation with two particular glycosyl donors, whereas 3-bromo-5-hydroxy-1,4-dimethoxynaphthalene was not an effective coupling partner with the same glycosyl donors. These studies indicate that subtle steric and electronic effects need to be considered in order to fine-tune C-glycosylations when using highly functionalized glycosyl donors.