Intermolecular Aminocarbonylation of Alkenes using Concerted Cycloadditions of Iminoisocyanates
作者:Amanda Bongers、Christian Clavette、Wei Gan、Serge I. Gorelsky、Lyanne Betit、Kaitlyn Lavergne、Thomas Markiewicz、Patrick J. Moon、Nicolas Das Neves、Nimrat K. Obhi、Amy B. Toderian、André M. Beauchemin
DOI:10.1021/acs.joc.6b02713
日期:2017.1.20
that the LUMO of the iminoisocyanate is reacting with the HOMO of the alkene. Computational and experimental results support a concerted asynchronous [3 + 2] cycloaddition involving an iminoisocyanate, which was observed for the first time by FTIR under the reaction conditions. The products of this reaction are complex azomethineimines, which are precursors to valuable β-amino carbonyl compounds such
[EN] A VERSATILE LIGAND FOR PALLADIUM-CATALYZED META-C-H FUNCTIONALIZATIONS<br/>[FR] LIGAND POLYVALENT POUR DES FONCTIONNALISATIONS DE MÉTA-C-H CATALYSÉES PAR DU PALLADIUM
申请人:SCRIPPS RESEARCH INST
公开号:WO2017184589A1
公开(公告)日:2017-10-26
A class of mono-protected 3-amino-2- hydroxypyridine (MPAHP) ligands that enable the meta- C-H arylation of anilines, phenols, phenylacetic acids, and biologically relevant heterocyclic compounds using norbornene as a transient mediator is disclosed. The applicability of this meta-arylation methodology in the pharmaceutical industry is illustrated for heteroaryl substrates and heteroaryl iodide coupling partners, a feat made possible by using the MPAHP ligand. The enabling nature of MPAHP ligands to achieve other meta-C-H functionalization processes is also illustrated by the development of a meta-C-H amination reaction and a meta-C-H alkynylation reaction.
Copper catalysed preparation of vinyl ethers from unactivated vinylic halides
作者:Menno A. Keegstra
DOI:10.1016/s0040-4020(01)88528-8
日期:1992.3
Vinylic halides have been treated with sodium methoxide in the presence of 10 mol% of copper bromide. Most of the vinylic methyl ethers could thus be obtained in a good yield. The reaction proceeds with a 100% retention of configuration. The mechanism of the process is shortly discussed.
[EN] LIGAND-ENABLED META-C-H ACTIVATION USING A TRANSIENT MEDIATOR<br/>[FR] ACTIVATION DE MÉTA-C-H PERMISE PAR UN LIGAND UTILISANT UN MÉDIATEUR TRANSITOIRE
申请人:SCRIPPS RESEARCH INST
公开号:WO2016123361A1
公开(公告)日:2016-08-04
An alternative approach to formation of a C-C bond at a meta-position of an aromatic compound is disclosed that employs an ethylenically unsaturated bicyclic compound as a transient mediator to achieve meta-selective C-H activation with a simple and common ortho-directing group. The use of a pyridine-based ligand assists in relaying the palladium catalyst to the meta-position by the unsaturated bicyclic compound following initial ortho-C-H activation.
Modular Synthesis of Pyrazolones Using an Alkene Aminocarbonylation Reaction
作者:Kaitlyn Lavergne、Amanda Bongers、Lyanne Betit、André M. Beauchemin
DOI:10.1021/acs.orglett.5b01719
日期:2015.7.17
A variety of pyrazolones were synthesized from enol ethers and hydrazones using a reaction sequence involving aminocarbonylation of enol ethers followed by nucleophile-induced aromatization of the azomethine iminesintermediates. Using bases to catalyze the in situ formation of imino isocyanates allowed alkene aminocarbonylation to proceed under milder conditions with reactive substrates and enabled