The ruthenium-catalyzed reaction of aryl ethers having a carbonyl group at the ortho position to the ether group with organoboronates (R-B(OCH2CMe2CH2O), R = aryl, alkenyl, and alkyl) resulted in site-selective C-C bond formation. Among the transition metal complexes screened, the RuH2(CO)(PPh3)3 complex showed the highest activity. Several aromatic ketones having methoxy or phenoxy groups at the ortho
在醚基邻位具有羰基的芳基醚与有机硼酸酯 (RB(OCH2CMe2CH2O),R = 芳基、烯基和烷基) 的钌催化反应导致位点选择性 CC 键的形成。在筛选出的过渡金属配合物中,RuH2(CO)(PPh3)3 配合物显示出最高的活性。几种在邻位具有甲氧基或苯氧基的芳族酮也可用于该偶联反应。各种含有给电子(NMe2、OMe、甲基和乙烯基)和吸电子(F 和 CF3)基团的芳基硼酸酯与甲氧基酮反应,以高产率得到相应的偶联产物。
Regioselective Alkenylation of Aromatic Ketones with Alkenylboronates Using a RuH<sub>2</sub>(CO)(PPh<sub>3</sub>)<sub>3</sub> Catalyst via Carbon−Hydrogen Bond Cleavage
作者:Satoshi Ueno、Naoto Chatani、Fumitoshi Kakiuchi
DOI:10.1021/jo070182g
日期:2007.4.1
The ruthenium-catalyzed alkenylation of C−H bonds with alkenylboronates has been explored for a series of aromatic ketones. The coupling reaction of pivalophenone (1) with 2-isopropenyl-5,5-dimethyl[1,3,2]dioxaborinane (2) gave the corresponding isopropenylation product in 73% yield. In the case of the reaction of a sterically congested alkenylboronate, such as 2-methylpropenylboronate (8), the yield