Ruthenium(II)-Catalyzed C–H Functionalization Using the Oxazolidinone Heterocycle as a Weakly Coordinating Directing Group: Experimental and Computational Insights
摘要:
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.
Substituted Benzoazepines As Toll-Like Receptor Modulators
申请人:Howbert James Jeffry
公开号:US20140066432A1
公开(公告)日:2014-03-06
Provided are compositions and methods useful for modulation of signaling through the Toll-like receptors TLR7 and/or TLR8. The compositions and methods have use in treating or preventing disease, including cancer, autoimmune disease, fibrotic disease, cardiovascular disease, infectious disease, inflammatory disorder, graft rejection, or graft-versus-host disease.