Copper(II)-Catalyzed CC Bond-Forming Reactions of α-Electron-Withdrawing Group-Substituted Ketene S,S-Acetals with Carbonyl Compounds and a Facile Synthesis of Coumarins
作者:Hong-Juan Yuan、Mang Wang、Ying-Jie Liu、Qun Liu
DOI:10.1002/adsc.200800584
日期:2009.1
A new catalytic CC bond-forming reaction has been developed. Catalyzed by cheap and commercially available copper(II) bromide (CuBr2; 10 mol%), the reactions of α-electron-withdrawing group (EWG)-substituted ketene S,S-acetals with aldehydes or ketones in acetonitrile at room temperature gave a variety of densely functionalized coupling products in excellent yields (80–98%). Based on this catalytic
已经开发了一种新的催化CC键形成反应。在室温下,通过廉价的可商购的溴化铜(II)(CuBr 2; 10 mol%)催化,α-吸电子基团(EWG)取代的乙烯酮S,S-缩醛与醛或酮在乙腈中的反应各种具有高密度功能的偶联产物,均具有出色的收率(80–98%)。基于此催化过程中,当水杨醛被选择作为羰基组分有效地合成香豆素衍生物。