Regio- and Stereoselective Route to Tetrasubstituted Olefins by the Palladium-Catalyzed Three-Component Coupling of Aryl Iodides, Internal Alkynes, and Arylboronic Acids
作者:Chengxiang Zhou、Richard C. Larock
DOI:10.1021/jo048265+
日期:2005.5.1
The Pd-catalyzed three-component coupling of readily available aryl iodides, internal alkynes, and arylboronic acids provides a convenient, one-step, regio- and stereoselective route to tetrasubstituted olefins in good to excellent yields, although electron-poor aryl iodides and dialkylalkynes normally afford only low yields under our standard reaction conditions. The proper combination of substrates
易获得的芳基碘化物,内部炔烃和芳基硼酸的Pd催化三组分偶合提供了便捷,一步式,区域选择性和立体选择性的途径,以良好或优异的收率获得了四取代烯烃,尽管贫电子的芳基碘化物和二烷基炔烃通常在我们的标准反应条件下收率低。底物和反应条件的适当组合对于高收率很重要。水的存在通常显着增加所需四取代烯烃的产率。反应涉及顺式-将来自芳基碘化物的芳基加成至炔烃的受阻较少或更富电子的末端,而将来自芳基硼酸的芳基加至另一末端。还成功开发了一种改进的室温程序,该程序对某些基材非常有效。通过应用我们的合成方案,他莫昔芬及其衍生物以简洁,区域选择性和立体选择性的方式合成。