title: Synthesis and characterization of bisoxazolines- and pybox-copper(II) complexes and their application in the coupling of α-carbonyls with functionalized amines.
abstract: Binuclear complexes [{(DMOX)CuCl}2(μ-Cl)2] (1), mononuclear complexes [(DMOX)CuBr2] (2) (DMOX = 4,5-dihydro-2-(4,5-dihydro-4,4-dimethyloxazol-2-yl)-4,4-dimethyloxazole) and the pybox Cu(II) complex [(Dm-Pybox)CuBr2] (3) (Dm-Pybox = 2,6-bis[4',4'-dimethyloxazolin-2'-yl]pyridine) were obtained by reactions of CuX2 (X = Cl, Br) with DMOX and Dm-Pybox ligands, respectively. The molecular structures of 1, 2 and 3 have been determined by single-crystal X-ray diffraction analyses. The complexes 2 and 3 are efficient in catalyzing α-amination of ketones and esters through α-bromo carbonyl intermediate. The procedures are environmentally benign methods using molecular oxygen as an oxidant with water as the only byproduct.
authors.affiliation: College of Chemistry and Materials Science, Center for Nano Science and Technology, The Key Laboratory of Functional Molecular Solids, Ministry of Education, Anhui Laboratory of Molecular-Based Materials, Anhui Normal University, Wuhu, 241000, China. wgjiasy@mail.ahnu.edu.cn shengeh@mail.ahnu.edu.cn.
authors.forename: Wei-Guo
authors.initials: WG
authors.lastname: Jia
authors.forename: Dan-Dan
authors.initials: DD
authors.lastname: Li
authors.forename: Yuan-Chen
authors.initials: YC
authors.lastname: Dai
authors.forename: Hui
authors.initials: H
authors.lastname: Zhang
authors.forename: Li-Qin
authors.initials: LQ
authors.lastname: Yan
authors.forename: En-Hong
authors.initials: EH
authors.lastname: Sheng
authors.forename: Yun
authors.initials: Y
authors.lastname: Wei
authors.forename: Xiao-Long
authors.initials: XL
authors.lastname: Mu
authors.forename: Kuo-Wei
authors.initials: KW
authors.lastname: Huang