Activation of sp3 and sp2 CH bonds of oxygen containing heterocyclic molecules for alkylation and arylation reactions catalyzed by an iron complex
作者:Yashraj Gartia、Punnamchandar Ramidi、Sreevishnu Cheerla、Charlette M. Felton、Darin E. Jones、Bhaskar C. Das、Anindya Ghosh
DOI:10.1016/j.molcata.2014.05.013
日期:2014.10
Activation of both sp(3) and sp(2) C-H bonds is reported using an efficient iron(III) complex (1) of a ligand (N2,N6-bis(2,6-diisopropylphenyl)pyridine-2,6-dicarboxamide: L). The iron(III) complex showed catalytic activity of C-C coupling reaction of oxygen containing heterocycles, e.g. tetrahydrofuran (THF), with various alkyl, allyl and aryl Grignard reagents under ambient reaction conditions. Complex 1 demonstrated excellent activity and reactions were completed within 30 min to 1 h. A high turnover frequency (TOF) of 1700 h(-1) using a low catalyst loading of 0.02 mol% was obtained for the reaction. Interestingly, the catalyst was selective in activation of the C-H bond adjacent to the oxygen in various oxygen containing heterocyclic molecules to yield 2-substitituted products. (C) 2014 Elsevier B.V. All rights reserved.