Lewis Acid-Triggered Selective Zincation of Chromones, Quinolones, and Thiochromones: Application to the Preparation of Natural Flavones and Isoflavones
作者:Lydia Klier、Tomke Bresser、Tobias A. Nigst、Konstantin Karaghiosoff、Paul Knochel
DOI:10.1021/ja306178q
日期:2012.8.22
A Lewis acid-triggered zincation allows the regioselective metalation of various chromones and quinolones. In the absence of MgCl(2), a C(3) zincation is observed, whereas in the presence of MgCl(2) or a related Lewis acid, C(2) zincation occurs. Applications to a natural flavone, isoflavone, and quinolone are shown.