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.
Gold-catalysed room-temperature cycloisomerisation of alkynes and unactivated enolisable ketones
作者:Paul W. Davies、Christelle Detty-Mambo
DOI:10.1039/c003473h
日期:——
The cycloisomerisation of simple keto-alkynes proceeds at room temperature under the mild conditions of gold catalysis. Bicyclic fused and spiro compounds can be obtained by overall 5-exo and 6-exo carbon–carbon bond-forming cyclisations.
a mild and selective catalytic aerobic oxidation process of olefins. This catalytic aerobic oxidation reaction was designed based on experimental and spectroscopic evidence assessing the reduction of atmospheric oxygen using a ferric porphyrin complex and pinacolborane to form a ferric boroperoxo porphyrin complex as an oxidizing species. The ferric boroperoxo porphyrin complex can be utilized as an
Combined use of Tf2NH and In(OTf)3 effectively promotes the cyclization of alk-5-ynyl ketones to cyclopent-1-enyl ketones at 30 °C. Single use of Tf2NH or In(OTf)3 requires heating at 50 °C for efficient cyclization. The In(OTf)3-promoted reaction of certain alk-5-ynyl ketones gives cyclohept-2-enones mainly.