Synthesis of Biaryl Ethers by the Copper-Catalyzed Chan–Evans–Lam Etherification from Benzylic Amine Boronate Esters
作者:Justin S. Marcum、Kathryn A. McGarry、Carl J. Ferber、Timothy B. Clark
DOI:10.1021/acs.joc.6b01254
日期:2016.9.2
benzylic amines with phenols has been achieved to provide biaryl ethers that are prevalent in biologically active compounds. A variety of substitution patterns on the aryl boronate ester and the phenol are tolerated under the reaction conditions, providing moderate to high yields. A competition reaction between phenol and aniline revealed condition-dependent selectivity in which the phenol could be highly
Role of Hemilabile Diamine Ligands in the Amine-Directed C–H Borylation of Arenes
作者:Lillian V. A. Hale、Kathryn A. McGarry、Marissa A. Ringgold、Timothy B. Clark
DOI:10.1021/om5007837
日期:2015.1.12
A study of the role played by the bidentate ligand used in amine-directed CH borylation is described. Both reaction conversion and selectivity were significantly impacted when steric congestion and electronic perturbations of the bidentate diamine ligand were made, but a more significant influence was imparted by reducing the bite angle of the ligand. N-Benzylaminopyridine was identified as a general ligand that improves both selectivity and yield for most problematic substrates previously reported with picolylamine as ligand.