Electrochemical Deoxygenative Thiolation of Preactivated Alcohols and Ketones
作者:Feng Zhang、Yang Wang、Yi Wang、Yi Pan
DOI:10.1021/acs.orglett.1c02738
日期:2021.10.1
This work describes an electrochemically promoted nickel-catalyzed deoxygenative thiolation of alcohols and ketones under mild conditions. Excellent substrate tolerance and good chemical yields can be achieved by graphene/nickel foam electrodes in an undivided cell. Further study to gain mechanistic insight into this electrochemical cross-coupling has been carried out.
A Palladium-Catalyzed Three-Component Cross-Coupling of Conjugated Dienes or Terminal Alkenes with Vinyl Triflates and Boronic Acids
作者:Longyan Liao、Ranjan Jana、Kaveri Balan Urkalan、Matthew S. Sigman
DOI:10.1021/ja201358b
日期:2011.4.20
A three-component coupling of vinyl triflates and boronic acids to alkenes catalyzed by palladium is reported. Using 1,3-dienes, selective 1,2-alkene difunction-alization is observed, whereas the use of terminal alkenes results in 1,1-alkene difunctionalization. The reaction outcome is attributed to the formation of stabilized, cationic Pd-π-allyl intermediates to regulate β-hydride elimination.
Chiral ligands and their transition metal complexes
申请人:Scholz Ulrich
公开号:US20070066825A1
公开(公告)日:2007-03-22
The present invention relates to chiral phosphorus compounds and their transition metal complexes, and also to the use of these transition metal complexes, especially in asymmetric syntheses.
Palladium-catalyzed β-vinylation of vinyl acetate with enol triflates. An entry to 1-acetoxy-1,3-dienes
作者:Pier Giuseppe Ciattini、Enrico Morera、Giorgio Ortar
DOI:10.1016/s0040-4039(00)74277-8
日期:1991.3
Reaction of enoltriflates 1a–h with vinyl acetate in the presence of a palladium catalyst affords 1-acetoxy-1,3-dienes 2a–h as the major products in 40–79% isolated yields.
Hydroxylic additives enhance yield and scalability of silicon-directed Nazarov reaction
作者:Shaon Joy、Waka Nakanishi、F.G. West
DOI:10.1016/j.tetlet.2013.07.139
日期:2013.10
As a result of difficulties in scaling up silicon-directedNazarovcyclization for use in the synthesis of taxane natural products, the effect of additives was examined. Hydroxylic additives were found to convey a consistent beneficial effect on the rate, overall yield, and scalability of these reactions. Optimal conditions (1.5 equiv methanol or water with substoichiometric FeCl3), were successfully