Ruthenium(II)-Catalyzed C–H Functionalization Using the Oxazolidinone Heterocycle as a Weakly Coordinating Directing Group: Experimental and Computational Insights
作者:Jamie A. Leitch、Philippe B. Wilson、Claire L. McMullin、Mary F. Mahon、Yunas Bhonoah、Ian H. Williams、Christopher G. Frost
DOI:10.1021/acscatal.6b01370
日期:2016.8.5
Herein, we report the ruthenium-catalyzed ortho C-H alkenylation of a wide range of N-aryloxazolidinone scaffolds. Alkenylation was achieved with complete mono selectivity with a scope of 27 examples in 2-MeTHF. Yields ranged from 23 to 94%, producing highly decorated oxazolidinone scaffolds. A kinetically relevant C-H cleavage was also observed with a kinetic isotope effect (KIE) of similar to 2. Density functional theory calculations provided information about mechanism, detailing the beta-hydride elimination as the most energetically challenging step of 13.5 kcal mol(-1). In-depth computational kinetic studies also predicted a KIE of 2.17 for C-H cleavage and an intrinsic KIE for the reaction of 2.22, in line with the experimentally observed value.