Expedient Deuterolabeling of Polyphenols in Ionic LiquidsDCl/D<sub>2</sub>O under Microwave Irradiation
作者:Ullastiina Hakala、Kristiina Wähälä
DOI:10.1021/jo070231p
日期:2007.7.1
Postsynthetic regioselective aromatic ring H/D exchanges in polyphenolic compounds are rapidly performed in high yields and isotopic purities in ionic liquidDCl/D2O under microwave irradiation. Other C-H bonds, including benzylic and lactone alpha-carbonyl sites, are not affected.
Daidzein, an isoflavone abundant in soy, has various interesting biological properties that have been ascribed potential beneficial effects on human health. The study of these properties and effects of daidzein in general requires that an isotopically labeled reference compound is available for quantitative measurements. We report here the preparation of a deuterium labeled daidzein by acid catalyzed H/D exchange of aromatic protons using D3PO4. BF3/D2O as a deuterating reagent at 100 degrees C. The product, [6,8,2',3',5',6'-D-6]-daidzein, is isotopically pure with all D atoms chemically stable during the various extraction and purification steps of the ID/GC/MS/SIM quantitation procedure.