Palladium(II)-Catalyzed Intramolecular C–H Alkenylation for the Synthesis of Chromanes
作者:Asier Carral-Menoyo、Alexander Misol、Marcos Gómez-Redondo、Nuria Sotomayor、Esther Lete
DOI:10.1021/acs.joc.8b03051
日期:2019.2.15
intramolecular Pd(II)-catalyzed alkenylation of aryl homoallyl ethers constitutes a mild, versatile, and efficient procedure for the synthesis of highly and diversely substituted chromanes and 2H-chromenes. The use of p-TsOH as an additive allows more efficient reactions that could be carried out a room temperature in most cases. The procedure has a wide scope, allowing the synthesis of alkylidenechromanes
Catalytic Scaffolding Ligands: An Efficient Strategy for Directing Reactions
作者:Thomas E. Lightburn、Michael T. Dombrowski、Kian L. Tan
DOI:10.1021/ja803011d
日期:2008.7.1
that promotes branch and diastereoselectivehydroformylation of terminal olefins as well as the regio- and diastereoselectivehydroformylation of disubstituted olefins is reported. It is shown that the ligand covalently and reversibly bonds to the substrate, allowing for directedhydroformylation. As the substrate ligand interaction is dynamic, hydroformylations are catalytic in ligand and do not require
The rhodium-catalyzed controllable diverse arylation of 2,5-dihydrofuran with arylboronic acids is reported. By fine-tuning of the reaction conditions, four different ring-opening or oxidative arylation pathways are controlled in the rhodium-catalyzedarylation of 2,5-dihydrofuran, granting selective access to 2-aryl or 3-aryl homoallylic alcohols and 3-aryl or 4-aryl-2,3-dihydrofurans. The catalytic