N -Heterocyclic carbene-palladium(II)-1-methylimidazole complex catalyzed α-arylation of symmetric dialkyl ketones with aryl chlorides
摘要:
N-Heterocyclic carbene-palladium(II)-1-methylimidazole [NHC-Pd(II)-Im] complex 1 showed efficient catalytic activity toward alpha-arylation of symmetric dialkyl ketones under mild conditions. It was found that the ratio of aryl chlorides and ketones drastically affected the reaction. When the ratio of aryl chlorides and ketones was 1:2, mono-arylated products can be obtained in good to high yields as the sole; while that of aryl chlorides and ketones was changed to 1:0.7, di- and mono-arylated products were obtained in good to high total yields at the same time, with the former as the major. (C) 2014 Elsevier B.V. All rights reserved.
Palladium-Catalyzed α-Ketone Arylation under Mild Conditions
作者:Changsheng Cao、Lingling Wang、Zhengyuan Cai、Lingqiao Zhang、Jin Guo、Guangsheng Pang、Yanhui Shi
DOI:10.1002/ejoc.201001428
日期:2011.3
α-arylation of ketones with aryl halides catalyzed by the easily prepared and air-stable palladium complex (SIPr)-Pd(Py)Cl 2 (3) is described. Complex 3 displays high activity for a variety of aryl halides (activated, unactivated, and sterically hindered aryl halides) under mild conditions. Moreover, both aryl and alkyl ketones can be arylated. The α-arylation of somealkyl ketones can even be run at room