A transition-metal-free & diazo-free styrene cyclopropanation
作者:Ana G. Herraiz、Marcos G. Suero
DOI:10.1039/c9sc02749a
日期:——
An operationally simple and broadly applicable novel cyclopropanation of styrenes using gem-diiodomethyl carbonyl reagents has been developed. Visible-light triggered the photoinduced generation of iodomethyl carbonyl radicals, able to cyclopropanate a wide array of styrenes with excellent chemoselectivity and functional group tolerance. To highlight the utility of our photocyclopropanation, we demonstrated
[EN] SILICON-BASED CROSS COUPLING AGENTS AND METHODS OF THEIR USE<br/>[FR] AGENTS DE COUPLAGE CROISÉ À BASE DE SILICIUM ET LEURS PROCÉDÉS D'UTILISATION
申请人:UNIV PENNSYLVANIA
公开号:WO2016011231A1
公开(公告)日:2016-01-21
Compositions and methods using silicon-based cross-coupling agents in the formation of carbon-carbon and carbon-nitrogen bonds are described.
Caesium fluoride-mediated hydrocarboxylation of alkenes and allenes: scope and mechanistic insights
作者:Ashot Gevorgyan、Marc F. Obst、Yngve Guttormsen、Feliu Maseras、Kathrin H. Hopmann、Annette Bayer
DOI:10.1039/c9sc02467k
日期:——
A caesium fluoride-mediated hydrocarboxylation of olefins is disclosed that does not rely on precious transition metal catalysts and ligands. The reaction occurs at atmospheric pressures of CO2 in the presence of 9-BBN as a stoichiometric reductant. Stilbenes, β-substituted styrenes and allenes could be carboxylated in good yields. The developed methodology can be used for preparation of commercial
Regio- and Enantioselective Decarboxylative Allylic Benzylation Enabled by Dual Palladium/Photoredox Catalysis
作者:Changhua Song、Hong-Hao Zhang、Shouyun Yu
DOI:10.1021/acscatal.1c05461
日期:2022.1.21
A decarboxylative allylic benzylation cocatalyzed by Pd/photoredox in a regio- and enantioselective manner has been achieved. Readily available aryl acetic acids are used as benzylic nucleophile equivalents without preactivation. This mild and atom-economical protocol expands the scope of coupling partners of allylic electrophiles. Vinyl epoxides could also go through this transformation smoothly,
Enantioselective Allylic Alkylation with 4-Alkyl-1,4-dihydro-pyridines Enabled by Photoredox/Palladium Cocatalysis
作者:Hong-Hao Zhang、Jia-Jia Zhao、Shouyun Yu
DOI:10.1021/jacs.8b10766
日期:2018.12.12
alkylation has been achieved enabled by the merger of photoredox and palladiumcatalysis. In this dual catalytic process, alkyl radicals generated from 4-alkyl-1,4-dihydropyridines act as the coupling partners of the π-allyl palladium complexes. The generality of this method has been illustrated through the reaction of a variety of allylesters with 4-alkyl-1,4-dihydropyridines. This mechanistically novel