The dicyclohexylcarbodiimide-mediated esterification of flavones and flavonols with tetrabutylammonium hydrogen sulfate, resulted in the formation of mono-, di- and trisu1fated products. Sulfation occured mainly at positions 7, 4' and 3 of the flavonoid skeleton and followed the order 7 > 4'> 3. Using this method, a number of mono- to trisu1fate esters of various naturally occuring flavones and flavonols
黄酮和
黄酮与
硫酸四丁
铵的二环己基碳二
亚胺介导的酯化反应导致单,二和三磺化产物的形成。
硫酸化主要发生在类
黄酮骨架的7、4'和3位上,并遵循7> 4'> 3的顺序。使用这种方法,合成了多种天然存在的
黄酮和
黄酮醇的单至三
硫酸酯,并且它们结构经分光镜方法验证。该方法可用于合成其他
硫酸化
天然产物,例如类
固醇和糖。