Highly substituted indenes have been prepared in good yields by the palladium-catalyzed carboannulation of diethyl 2-(2-(1-alkynyl)phenyl)malonate with aryl, benzylic, and alkenyl halides. The reaction conditions and the scope of the process were examined, and a possible mechanism is proposed.
Synthesis of Indenes by the Transition Metal-Mediated Carboannulation of Alkynes
作者:Daohua Zhang、Zhijian Liu、Eul K. Yum、Richard C. Larock
DOI:10.1021/jo0620563
日期:2007.1.1
The synthesis of highly substituted indenes has been achieved by three different transition metal-mediated methods. The first method involves the palladium-catalyzed carboannulation of internalalkynes. The second method utilizes a two-step approach, which involves first the palladium/copper-catalyzed cross-coupling of terminalalkynes with appropriately functionalized aryl halides, followed by copper-catalyzed