Reductive Coupling of Allylic Esters with Carbonyl Compounds Mediated by the Mischmetall/[SmI2/Pd0cat.′]cat. System
作者:Sédami Médégan、Florence Hélion、Jean-Louis Namy
DOI:10.1002/ejoc.200500291
日期:2005.11
“two-stage catalysis” has been carried out using SmI2 and Pd(PPh3)4 in catalytic amounts together with mischmetall (an alloy of the light lanthanides) as a co-reductant. A catalytic scheme that takes into account previously reported reactions of SmI2/Pd0cat. and mischmetall/SmI2,cat. systems is proposed. It has also been shown that palladium complexes catalyse the addition of organolanthanide species
Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed, which accommodates a variety of allylic and ketone substrates. Although chiral ligand is necessary for the transformation, no enantioselectivity was observed. Nickel-catalyzed efficient umpolung allylation of ketones with allyliccarbonates in the presence of zinc powder is developed
Allylation of Carbonyl Compounds by Allylic Acetates Using a Cobalt Halide as Catalyst
作者:Corinne Gosmini、Paulo Gomes、Jacques Périchon
DOI:10.1055/s-2003-40999
日期:——
In acetonitrile as solvent and in the presence of a simple cobalt halide as catalyst, the reduction by zinc dust of a mixture of aldehydes or ketones and allylic acetates affords the corresponding homoallylic alcohols in good yields.
Synthesis and reactivity of benzylic and allylic samarium compounds
作者:C. Bied、J. Collin、H.B. Kagan
DOI:10.1016/s0040-4020(01)88468-4
日期:1992.1
Benzyl and allyl samarium species are prepared by reaction of benzylic or allylicchlorides with SmCp2. They present a wide scope of reactivity towards aldehydes, ketones and acid chlorides.
Reductive C-O bond cleavage of allylic benzyl ethers with two equivalents of (C5Me5)2Sm(THF)n (n=2 or 0) takes place selectively to generate(C5Me5)2Sm(η3-allyl) complexes in high yields along with equimolar amounts of the samarium benzyloxide.