Synthesis of flavonoid sulfates: 1. stepwise sulfation of positions 3, 7, and 4 using N,N'-dicyclohexylcarbodiimide and tetrabutylammonium hydrogen sulfate
作者:Denis Barron、Ragal K. Ibrahim
DOI:10.1016/s0040-4020(01)87695-x
日期:1987.1
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