National Changhua University of Education Institutional Repository : Item 987654321/18979
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题名: Direct C5-Arylation Reaction between Imidazoles and Aryl Chlorides Catalyzed by Palladium Complexes with Phosphines and N-Heterocyclic Carbenes
作者: P. Vijaya Kumar;Lin, Wu-Shien;Shen, Jiun-Shian;Debkumar Nandi;Lee, Hon Man
贡献者: 化學系
日期: 2011-09
上传时间: 2014-08-14T04:30:32Z
出版者: American Chemical Society
摘要: Palladium(II) acetate complexes bearing phosphines and carbene ligands, Pd(L)(PR3)(OAc)2 (1a, R = Ph; 1b, R = Cy; L = 1,3-dibenzylimidazol-2-ylidene), were prepared by salt metathesis reactions of their chloro complexes with AgOAc in good yields. The electron-rich 1b was efficient in catalyzing C-5 direct arylation of imidazoles with aryl halides. Most significantly, the catalytic system allows a range of aryl chlorides as substrates. Microwave irradiation effectively promotes the reactions, with good yields obtainable in only 2 h. In combination with the classical method of C–C bond formation reactions, novel imidazole derivatives featuring biaryl and styryl subunits were successfully obtained from 1,4-dichlorobenzene and 1-bromo-4-chlorobenzene.
關聯: Organometallics, 30(19): 5160-5169
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