Palladium-Catalyzed Intramolecular Hydroalkylation of Alkenyl- ?-Keto Esters, ?-Aryl Ketones, and Alkyl Ketones in the Presence of Me3SiCl or HCl
作者:Xiaoqing Han、Xiang Wang、Tao Pei、Ross A. Widenhoefer
DOI:10.1002/chem.200400459
日期:2004.12.17
palladium-catalyzed hydroalkylation, but rather served as a source of HCl, which presumably catalyzes enolization of the ketone. Identification of HCl as the active promoter of palladium-catalyzed hydroalkylation led to the development of an effective protocol for the hydroalkylation of alkyl 3-butenyl ketones that employed sub-stoichiometric amounts of 2, HCl, and CuCl2 in a sealed tube at 70 degrees C.
Highly Efficient, Reversible Addition of Activated Methylene Compounds to Styrene Derivatives Catalyzed by Silver Catalysts
作者:Xiaoquan Yao、Chao-Jun Li
DOI:10.1021/jo050570n
日期:2005.7.1
A highlyefficient inter- and intramolecular addition of 1,3-diketone/β-ketoester to alkenes was developed by using silver catalysts. Silver triflate shows the highest catalytic activity. The reaction is reversible through the cleavage of a carbon−carbon bond by silver at an elevated temperature.
Palladium-catalyzed cyclization of alkenyl β-keto esters in the presence of chlorotrimethylsilaneElectronic supplementary information (ESI) available: experimental procedures, analytical and spectroscopic data for new compounds and cyclohexanones. See http://www.rsc.org/suppdata/cc/b1/b111644d/
作者:Tao Pei、Ross A. Widenhoefer
DOI:10.1039/b111644d
日期:2002.3.7
PdCl2(CH3CN)2 catalyzed the cyclization of alkenyl beta-keto esters in the presence of a stoichiometric amount of SiMe3Cl to form 2-carboalkoxycyclohexanones in good yield with excellent regioselectivity.