30 research outputs found
Ruthenium-catalyzed, site-selective C–H activation: access to C5-substituted azaflavanone
A site-selective ruthenium-catalyzed keto group assisted C-H bond activation of 2-aryl tetrahydroquinoline (azaflavanone) derivatives has been achieved with a variety of alkenes for the first time. A wide range of substrates was utilized for the synthesis of a wide variety of alkenylated azaflavanones. This simple and efficient protocol provides the C5-substituted azaflavanone derivatives in high yields with a broad range of functional group tolerance. Further, the C5-alkenylated products were converted into substituted 2-aryl quinoline derivatives in good yields. This journal is © The Royal Society of Chemistry
Minimally Disruptive Cooperative Lane-change Maneuvers
A lane-change maneuver on a congested highway could be severely disruptive or
even infeasible without the cooperation of neighboring cars. However,
cooperation with other vehicles does not guarantee that the performed maneuver
will not have a negative impact on traffic flow unless it is explicitly
considered in the cooperative controller design. In this letter, we present a
socially compliant framework for cooperative lane-change maneuvers for an
arbitrary number of CAVs on highways that aims to interrupt traffic flow as
minimally as possible. Moreover, we explicitly impose feasibility constraints
in the optimization formulation by using reachability set theory, leading to a
unified design that removes the need for an iterative procedure used in prior
work. We quantitatively evaluate the effectiveness of our framework and compare
it against previously offered approaches in terms of maneuver time and incurred
throughput disruption.Comment: 6 pages, 2 figure
Ester-directed orthogonal dual C–H activation and ortho aryl C–H alkenylation via distal weak coordination
An unprecedented orthogonal cross-coupling between aromatic C(sp2) and aliphatic olefinic C(sp2) carbons of two same molecules via dual C-H bond activation in an intermolecular fashion has been developed using a distal ester-directing group. This new coupling reaction led to the synthesis of the highly functionalized 1,3-diaryl molecular architecture in very good yields and with high chemo- and regioselectivities. In addition, using ester as the distal directing group, ortho C-H olefination of α-methyl aryl acrylates and cinnamic esters with various alkenes has been achieved in very good yields and with a wide range of substrate scope. This journal is © The Royal Society of Chemistry