Di-<i>tert</i>-butylneopentylphosphine (DTBNpP): An Efficient Ligand in the Palladium-Catalyzed α-Arylation of Ketones
作者:Steven M. Raders、Jessica M. Jones、Jeffrey G. Semmes、Steven P. Kelley、Robin D. Rogers、Kevin H. Shaughnessy
DOI:10.1002/ejoc.201402474
日期:2014.11
palladium(II) acetate provide an efficient catalytic system for the α-arylation of ketones. Aryl bromides were coupled with ketones using 0.25–0.5 mol-% Pd(OAc)2/DTBNpP in toluene at 50 °C, whereas aryl chlorides required a higher catalyst loading (0.5–2.0 mol-%) and a higher temperature (80 °C). Coupling of 2-bromophenol with ketones using the Pd/DTBNpP system provides an efficient route for the synthesis
Simple, Highly Active Palladium Catalysts for Ketone and Malonate Arylation: Dissecting the Importance of Chelation and Steric Hindrance
作者:Motoi Kawatsura、John F. Hartwig
DOI:10.1021/ja983378u
日期:1999.2.1
catalytic reaction rates. We initially tested the bisphosphine ligand DtBPF (1,1‘-bis-(di-tert-butylphosphino)ferrocene) for this palladium-catalyzed chemistry. This catalyst system led to fast reaction rates for reactions of aryl bromides with ketones, including roomtemperature chemistry in many cases. In some cases turnover numbers were 20 000. The catalyst also gave mild reactions with aryl chlorides