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
Hidden Role of Borane in Directed C–H Borylation: Rate Enhancement through Autocatalysis
作者:Nghia Le、Natalie L. Chuang、Clay M. Oliver、Andrey V. Samoshin、Jack T. Hemphill、Kelsey C. Morris、Stephen N. Hyland、Hairong Guan、Charles Edwin Webster、Timothy B. Clark
DOI:10.1021/acscatal.3c03316
日期:2023.10.6
metal-catalyzed C–Hborylation reaction is a robust and valuable method for the installation of boronate esters into simple organic substrates. The regioselectivity observed in early examples was governed by steric control; those systems were extended to include a number of approaches that override the natural selectivity to obtain directedC–Hborylation. In spite of the array of catalysts and directing groups
Iridium-Catalyzed, Substrate-Directed C–H Borylation Reactions of Benzylic Amines
作者:Andrew J. Roering、Lillian V. A. Hale、Phillip A. Squier、Marissa A. Ringgold、Emily R. Wiederspan、Timothy B. Clark
DOI:10.1021/ol301635x
日期:2012.7.6
The iridium-catalyzedarene C–H borylation reaction of benzylic amines has been developed, which inverts the typical steric-controlled product distribution to provide ortho-substituted boronate esters. Picolylamine was found to be an ideal ligand to replace 4,4′-di-tert-butylbipyridine to induce the directing effect. Preliminary experiments are consistent with a mechanism involving dissociation of
Selective Formation of <i>ortho</i>-Aminobenzylamines by the Copper-Catalyzed Amination of Benzylamine Boronate Esters
作者:Kathryn A. McGarry、Alexi A. Duenas、Timothy B. Clark
DOI:10.1021/acs.joc.5b01074
日期:2015.7.17
The copper-catalyzedcoupling between benzylamino boronate esters and aryl amines has been investigated. Formation of ortho-aminobenzylamines was achieved under oxidative conditions in the presence of copper(II) acetate. The major side product of the transformation is the homocoupling of the aryl boronate ester. The formation of the desired diamines was found to be improved in the absence of base,