Disambiguation of Metal and Brønsted Acid Catalyzed Pathways for Hydroarylation with Platinum(II) Catalysts
摘要:
The hydroarylation of unactivated olefins effected by Pt(II) precatalysts was found to proceed through the in situ production of protic acid followed by a Friedel Crafts mechanism. The reaction was investigated using the hindered base 2,6-di-tert-butyl-4-methylpyridine and a variety of substrates.
highly efficient hydroesterification of alkynesemployingarylformates has been developed without the use of externalcarbonmonoxide and at ambient pressure. The reaction in the presence of a palladium-xantphos catalyst system selectively affords α,β-unsaturated esters in good to high yields. Use of an aryl formate is crucial and alkyl formates did not react at all. The hydroesterification of norbornene
Intermolecular addition reactions of <i>N</i>-alkyl-<i>N</i>-chlorosulfonamides to unsaturated compounds
作者:Gerold Heuger、Richard Göttlich
DOI:10.3762/bjoc.11.136
日期:——
N-Alkyl-N-chlorosulfonamides add to alkenes under copper(I) catalysis. In reactions of styrene derivatives with terminal double bonds the addition products were obtained in excellent yield and high regioselectivity. Lower yields are obtained in addition reactions to non-aromatic alkenes. The reaction most likely proceeds via a redox catalysis and amidyl radicals, a concerted mechanism has been ruled
A General Acid‐Mediated Hydroaminomethylation of Unactivated Alkenes and Alkynes
作者:Daniel Kaiser、Veronica Tona、Carlos R. Gonçalves、Saad Shaaban、Alberto Oppedisano、Nuno Maulide
DOI:10.1002/anie.201906910
日期:2019.10.7
its considerable potential to streamline amine synthesis. State-of-the-art protocols for hydroaminomethylation of alkenes rely largely on transition-metal catalysis, enabling this transformation only under highly designed and controlled conditions. Here we report a broadly applicable, acid-mediated approach to the hydroaminomethylation of unactivated alkenes and alkynes. This methodology employs cheap
申请人:The University of Georgia Research Foundation, Inc
公开号:US20180065909A1
公开(公告)日:2018-03-08
Provided are methods for the meta-selective C—H arylations of arene alcohol-based substrates. The methods combine the transient norbornene strategy with a quinoline-based acetal scaffold to achieve the formation of biaryl compounds. These processes establish a foundation for catalytic polyfunctionalization of alcohol-based compounds. The method comprises attaching a heterocyclic hemiacetal scaffold to an aromatic alcohol or a substituted aromatic alcohol; reacting the aromatic or substituted aromatic alcohol having the heterocyclic hemiacetal scaffold attached with an alkyl or aryl iodide in a reaction mix comprising a palladium catalyst, a silver salt, and carboxymethyl norbornene to generate a meta-arylated arene conjugated to the heterocyclic hemiacetal scaffold; and then cleaving the heterocyclic hemiacetal scaffold from the meta-arylated arene alcohol.
Mechanophotocatalysis: A Generalizable Approach to Solvent‐minimized Photocatalytic Reactions for Organic Synthesis
作者:Francis Millward、Eli Zysman‐Colman
DOI:10.1002/anie.202316169
日期:2024.3.22
Via the synergistic union with mechanochemistry, four archetypal photocatalysis reactions have been realized under solvent-free or solvent-minimized conditions. The mechanophotocatalytic versions feature competitive or superior efficiencies to the solution-state reactions, while also showcasing an enhanced tolerance to aerobic conditions.