Ketones and alkynes join together: The catalytic title reaction proceeds rapidly at 120 °C and requires only 1 hour for completion (see scheme). The reaction mechanism likely involves chelation‐assisted ortho CHactivation, insertion of the alkyne moiety, carbocyclization, and protonation. Cp*=pentamethylcyclopentadienyl.
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.
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