Palladium-Catalyzed Intramolecular Hydroalkylation of Unactivated Olefins with Dialkyl Ketones
摘要:
Treatment of 3-butenyl heptyl ketone with substoichiometric amounts of PdCl2(CH3CN)(2) (10 mol %), HCl (0.1 equiv), and CuCl2 (0.3 equiv) in dioxane at 70 degreesC for 12 h in a sealed tube formed 2-hexylcyclohexanone in 77% isolated yield. A number of alkyl 3-butenyl ketones underwent hydroalkylation under these conditions to form 2-substituted cyclohexanones in moderate to good yield.
Regioselective Hydroacylation of 1,3-Dienes by Cobalt Catalysis
作者:Qing-An Chen、Daniel K. Kim、Vy M. Dong
DOI:10.1021/ja500268w
日期:2014.3.12
We describe a cobalt-catalyzed hydroacylation of 1,3-dienes with non-chelating aldehydes. Aromatic aldehydes provide 1,4-addition products as the major isomer, while aliphatic aldehydes favor 1,2-hydroacylation products. The kinetic profile supports an oxidative cyclization mechanism involving a cobaltacycle intermediate that undergoes transformation with high regio- and stereoselectivity.