Dioxygen-Promoted Regioselective Oxidative Heck Arylations of Electron-Rich Olefins with Arylboronic Acids
作者:Murugaiah M. S. Andappan、Peter Nilsson、Henrik von Schenck、Mats Larhed
DOI:10.1021/jo049434t
日期:2004.8.1
with arylboronic acids. This appears to constitute the first example of palladium(II)-catalyzed internal Heck arylations. The novel protocol exploits oxygen gas for environmentally benign reoxidation and a stable 1,10-phenanthroline bidentate ligand to promote the palladium(II) regeneration and to control the regioselectivity. Internal arylation is strongly favored with electron-rich arylboronic acids
用芳基硼酸进行富电子的杂原子取代的烯烃的芳基化。这似乎构成了钯(II)催化的内部Heck芳基化的第一个实例。该新方案利用氧气对环境进行良性再氧化,并利用稳定的1,10-菲咯啉双齿配体来促进钯(II)再生并控制区域选择性。富含电子的芳基硼酸强烈推荐内部芳基化。DFT计算支持电荷驱动的选择性原理,其中被供电子基团取代的苯基更喜欢烯烃的贫电子α-碳。通过计算验证的实验证实了催化路线的阳离子性质。这种Heck方法可轻松轻松地获得官能化的酰胺类化合物。