An approach for the synthesis of benzofulvenes has been developed through palladium‐catalyzed sequential three‐componentreactions. The reactions likely involve C,C‐palladacycles as the key intermediates. The palladacycles are generated through cascade reactions of aryl halides and alkynes, and then reacted with CH2Br2 to form benzofulvenes as the final products.
Diverse Strategies toward Indenol and Fulvene Derivatives: Rh-Catalyzed C−H Activation of Aryl Ketones Followed by Coupling with Internal Alkynes
作者:Frederic W. Patureau、Tatiana Besset、Nadine Kuhl、Frank Glorius
DOI:10.1021/ja110650m
日期:2011.2.23
The synthesis of indenols and fulvenes was achieved through Rh-catalyzed C-H bond activation of simple and diverse arylketone derivatives and subsequent coupling with internal alkynes. The process was found to involve either an α or γ dehydration step, depending on the substrate disposition and representing diverse pathways toward functionalized fulvenes.
intermediates, such as enynes and silylbenzofulvenes, have been isolated. Different control experiments have been performed, indicating the participation of [LAu][NTf2AlCl3] complex as the true catalyst, and revealing a dramatic enhancement of the gold activity by coordination of the Lewis acid to the gold counterion.