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.
The cationic iridium complex ([Ir(cod)2]OTf + rac-BINAP) efficiently catalyzed a sequential process of ortho-C-H bond functionalization, cyclization and dehydration, leading to a concise preparation of 1-methylene indene (benzofulvene) derivatives. The iridium complex operated as a catalyst in the ortho-C-H bond alkenylation of aryl ketones with alkynes and as a Lewis acid catalyst in the cyclization of the alkenylated product and the subsequent dehydration.
Ruthenium-Catalyzed Regioselective Cyclization of Aromatic Ketones with Alkynes: An Efficient Route to Indenols and Benzofulvenes
作者:Ravi Kiran Chinnagolla、Masilamani Jeganmohan
DOI:10.1002/ejoc.201101364
日期:2012.1
substituted acetophenones to afford the corresponding indenol derivatives in a highly regioselective manner. The amount of silversalt plays a key role in the reaction. When the amount of silversalt exceeded more than 8 mol-% in the presence of 2 mol-% [RuCl2(p-cymene)}2], a different type of dehydration product, namely a benzofulvene derivative, started to appear. In the presence of 20 mol-% AgSbF6, substituted