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中文摘要：
建立了一种以价廉易得的白杨素为原料，经溴代反应、甲氧基化反应、选择性的甲基化和去甲基化反应合成了5个在天然产物中不易得到的A环多氧取代黄酮的方法，产物结构经1HNMR、13CNMR和EI-Ms分析确认。该方法操作简便、条件温和、产率高、成本低，适合工业化生产。
英文摘要：
An expeditious synthesis of five A-ring of polyoxy- genated flavones by the reaction of bromination, methoxylation, selective methylation and demethylation starting from ehrysin is reported. The structure was confirmed by NMR, FT- IR and MS. This synthetic method can be simply and econom- ically operated with mild conditions and high yield and it is suitable for largescale pilot-plant synthesis.
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Antioxidant potential, total phenolic and total flavonoid contents of Rhododendron anthopogonoides a
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