C,O-Chelated BINOL/Gold(III) Complexes: Synthesis and Catalysis with Tunable Product Profiles
作者:Jian-Fang Cui、Hok-Ming Ko、Ka-Pan Shing、Jie-Ren Deng、Nathanael Chun-Him Lai、Man-Kin Wong
DOI:10.1002/anie.201612243
日期:2017.3.6
Unprecedented stable BINOL/gold(III) complexes, adopting a novel C,O‐chelation mode, were synthesized by a modular approach through combination of 1,1′‐binaphthalene‐2,2′‐diols (BINOLs) and cyclometalated gold(III) dichloride complexes [(C^N)AuCl2]. X‐ray crystallographic analysis revealed that the bidentate BINOL ligands tautomerized and bonded to the AuIII atom through C,O‐chelation to form a five‐membered
The Synthesis of Oxazolines Using the Vilsmeier Reagent
作者:Peter G. M. Wuts、Jill M. Northuis、Tricia A. Kwan
DOI:10.1021/jo000664r
日期:2000.12.1
Unprecedented Formation of π-Copper Complexes during Sonogashira Coupling: Synthesis of a Unique, Recyclable, Ethynyl Ferrocene Derived Cu(I) Specific Ligand
作者:Mayukh Deb、Dheeraj Kumar、Jatinder Singh、Anil J. Elias
DOI:10.1021/acs.organomet.6b00069
日期:2016.4.25
During the synthesis of a chiral oxazolinyl-derived ethynyl ferrocene Fc-C C-C6H4-o-(4-iPr-2-Ox)} (Fc = ferrocenyl; Ox = oxazolinyl), we observed an unprecedented formation of highly air stable and monomeric pi-copper(I) complexes 4a and 4b, which were structurally characterized. CuI was used as a cocatalyst in this Sonogashira coupling. By the reaction of 4a with aqueous NH3/DMF, the CuI was removed from the complex and the metal-free compound 5a was obtained. This was found to be an excellent ligand for selectively binding Cu(I) halides. Analogous 4-Ph-substituted oxazoline-based ligand 5b and its Cu-I complex 4c were also isolated and characterized. The possible role of these complexes in explaining the copper cycle proposed for Sonogashira coupling has also been discussed.