Synthesis of xanthoneO-glycosides. Part III. Synthesis of 1- and 8-O-?-D-glycosides of 5-O-methyl- and de-O-methylbellidifolin
作者:Barbara Vermes、Otto Seligmann、Hildebert Wagner
DOI:10.1002/hlca.19850680832
日期:1985.12.18
The unambiguous synthesis of three naturally occurring and biologically active xanthone 1-O and 8-O-β-D-glucosides of 5-O-methyl- and de-O-methylbellidifolin (2–4) was accomplished. The protected xanthone aglycones having only a single reactive OH group were prepared by selective benzylation, methylation, and debenzoylation reactions. An unexpected stability of the 1-MeO group towards demethylation
完成了3种天然存在且具有生物活性的蒽酮1- O和8 - O -β-D-葡萄糖苷(5- O-甲基-和去-O-甲基bellidifolin(2-4)的明确合成)。通过选择性苄基化,甲基化和脱苯甲酰化反应制备仅具有单个反应性OH基团的被保护的蒽酮苷元。观察到1-MeO基团对去甲基化的出乎意料的稳定性。