Synthesis of Copper(I) Complexes of N‐Heterocyclic Carbene–Phenoxyimine/amine Ligands: Structures of Mononuclear Copper(II), Mixed‐Valence Copper(I)/(II), and Copper(II) Cluster Complexes
作者:Stevan Simonovic、Adrian C. Whitwood、William Clegg、Ross W. Harrington、Michael B. Hursthouse、Louise Male、Richard E. Douthwaite
DOI:10.1002/ejic.200801152
日期:2009.5
Reaction between the silver(I) bromide derivative of 1a and CuCl2·2H2O gives a complex derived from a Cu6(O)(OH)4Cl3 core and two (NO) and one (CNO) ligands, respectively. The use of 2a and 7 as precatalysts for 1,4-conjugate addition to enones and aziridination of alkenes was studied, showing that, whilst both catalysts are active, enantioselectivities are low, which is attributed to the lack of Cu-(NO)
NHC-酚亚胺配体前体3-[(1R,2R)-2-[1-(3,5-二叔丁基-2-羟基苯基)甲基-]的溴化铜(I)配合物(2a和2b) (E)-ylidene]amino}cyclohexyl]-1-isopropyl-4-phenyl-3H-imidazol-1-ium bromide (1a) 和 3-[(1R,2R)-2-[1-(2-hydroxyphenyl) )甲基-(E)-亚基]氨基}环己基]-1-异丙基-4-苯基-3H-咪唑-1-溴化鎓(1b)}已分别制备}。配合物 2a 和 2b 仅通过卡宾碳原子 (C) 表现出铜配位,并且不会自发消除 HBr 以产生额外的苯氧基亚胺 (NO) 键,这归因于分子内氢键。2a 和 2b 的结晶分别得到 2a' 和 2b',它们包含 (C) 溴化铜 (I) 和 (NO)2 铜 (II) 配位。配合物 2b' 还表现出分子间 CuIBr 相互作用,产生一个