Ketyl Radical Generation by Photoexcited Palladium and Development of Organopalladium-Type Reactions
作者:Kosaku Tanaka
DOI:10.1021/acscatal.4c00510
日期:2024.4.5
Enabling reactions of traditional substrates that are inert to Pd catalysts has the potential for further advancements in the field of Pd chemistry. In this study, we developed a method for generating ketyl radicals through the reaction of a photoexcited Pd species with ketones. Upon subsequent reaction with olefins, the ketyl radicals generated through this method yielded Pd-specific reductive and
Gold-Catalyzed Intramolecular Carbocyclization of Alkynyl Ketones Leading to Highly Substituted Cyclic Enones
作者:Tienan Jin、Yoshinori Yamamoto
DOI:10.1021/ol702455v
日期:2007.12.1
The reaction of the internal alkynyl ketones 1 (n = 1) under the combined catalyst, AUCl(3) and AgSbF6, gave the enones 2 in good to high yields, whereas that of the terminal alkynyl ketones 1 (n = 0) under the combined catalyst, AuCl3 and AgOTf, afforded the cyclic enones 3.
Cyclization of 5-alkynones with chromium alkylidene equivalents generated <i>in situ</i> from <i>gem</i>-dichromiomethanes
A rare example of cyclization with 5-alkynones, which possess non-polar alkynyl and less electrophilic polar keto carbonyl groups, was demonstrated. The key to promoting carbene/alkyne metathesis followed by alkylidenation with pendant CO double bonds was the Schrock-type nucleophilic reactivity of the generated chromium carbene equivalents from readily available diiodomethanes and CrCl2 by simple
Synthesis of Cyclohexane-Fused Isocoumarins via Cationic Palladium(II)-Catalyzed Cascade Cyclization Reaction of Alkyne-Tethered Carbonyl Compounds Initiated by Intramolecular Oxypalladation of Ester-Substituted Aryl Alkynes
作者:Jianbo Zhang、Xiuling Han、Xiyan Lu
DOI:10.1021/acs.joc.6b00128
日期:2016.4.15
A cationic Pd(II)-catalyzedcascade cyclization reaction of alkyne-tethered carbonyl compounds was developed. This reaction is initiated by intramolecular oxypalladation of alkynes with an ester group followed by 1,2-addition of the formed C–Pd(II) bond to the carbonyl group, providing a highly efficient method for the synthesis of cyclohexane-fused isocoumarins.