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.
路易斯酸引发的锌化允许各种色酮和喹诺酮的区域选择性金属化。在没有 MgCl(2) 的情况下,观察到 C(3) 锌化,而在 MgCl(2) 或相关的路易斯酸存在的情况下,会发生 C(2) 锌化。显示了对天然黄酮、异黄酮和喹诺酮的应用。