Rhodium-catalyzed conjugate addition of arylindium reagents to α,β-unsaturated carbonyl compounds
作者:Rubén Tato、Ricardo Riveiros、José Pérez Sestelo、Luis A. Sarandeses
DOI:10.1016/j.tet.2011.11.075
日期:2012.2
A novel rhodium-catalyzedconjugateaddition of indium reagents to electron deficient olefins is reported. The reaction takes place in THF/MeOH at 110 °C using arylindium dichlorides, a rhodium(I)-binap complex as catalyst, and α,β-unsaturated ketones and lactones in good yields (45–94%). The addition of MeOH is crucial for an efficient transformation and NMR studies seem to indicate that promotes
Laccase/2,2,6,6-Tetramethylpiperidinoxyl Radical (TEMPO): An Efficient Catalytic System for Selective Oxidations of Primary Hydroxy and Amino Groups in Aqueous and Biphasic Media
radical (TEMPO) catalyticsystems enable efficient aerobic oxidations of primary alcohols but they generally show a reduced reactivity in aqueousmedium. Herein, we report an oxidative catalyticsystem composed of Trametes versicolor laccase and TEMPO, which is able to work in buffer solutions at room temperature using ambient air. Although this catalyticsystem displays great efficiency in aqueous systems