Palladium-Catalyzed Coupling of Allyl Acetates with Aldehyde and Imine Electrophiles in the Presence of Bis(pinacolato)diboron
作者:Sara Sebelius、Olov A. Wallner、Kálmán J. Szabó
DOI:10.1021/ol035052i
日期:2003.8.1
(4) electrophiles to afford homoallylicalcohols (5a-h) and amines (6a-d), respectively. A particularly interesting mechanistic feature is that the allylic substitution of the transient allyl boronate with sulfon-imine requires palladium catalysis. This finding indicates that the formation of the homoallylic amine derivatives (6a-d) involves bis-allylpalladium intermediates.
Allylation of Aldehyde and Imine Substrates with In Situ Generated Allylboronates - A Simple Route to Enatioenriched Homoallyl Alcohols
作者:Sara Sebelius、Kálmán J. Szabó
DOI:10.1002/ejoc.200500069
日期:2005.6
Allylation of aldehyde and imine substrates was achieved using easily available allylacetates and diboronate reagents in the presence of catalytic amounts of palladium. This operationally simple one-pot reaction has a broad synthetic scope, as many functionalities including, acetate, carbethoxy, amido and nitro groups are tolerated. The allylation reactions proceed with excellent regio- and stereoselectivity
Regioselective Palladium-Catalyzed Electrophilic Allylic Substitution in the Presence of Hexamethylditin
作者:Olov A. Wallner、Kálmán J. Szabó
DOI:10.1021/ol0257777
日期:2002.5.1
[reaction: see text]. Palladium-catalyzed electrophilic allylicsubstitution of functionalized allyl chlorides and allyl acetates can be achieved in the presence of hexamethylditin under mild reaction conditions. The substitution reaction occurs with very high regioselectivity at the branched allylic terminus. Regioselective tandem bisallylation reaction could be performed by employing benzylidenemalonitrile
Pincer Complex-Catalyzed Allylation of Aldehyde and Imine Substrates via Nucleophilic η<sup>1</sup>-Allyl Palladium Intermediates
作者:Niclas Solin、Johan Kjellgren、Kálmán J. Szabó
DOI:10.1021/ja049357j
日期:2004.6.1
the presented reactions involve monoallylpalladium intermediates. Thus, employment of pincer complex catalysts extends the synthetic scope of the palladium-catalyzed allylic substitution reactions. Moreover, use of these catalysts eliminates the side reactions occurring in transformations via bisallylpalladium intermediates. The key intermediate of the electrophilic substitution reaction was observed
Palladium Pincer Complex-Catalyzed Allylic Stannylation with Hexaalkylditin Reagents
作者:Olov A. Wallner、Kálmán J. Szabó
DOI:10.1021/ol049328d
日期:2004.5.1
stannylation of allylchloride, phosphonate, and epoxide substrates (4a-h) could be performed with hexaalkylditin reagents (3) under mild neutral reaction conditions. This catalytic reaction proceeds via palladium(II) intermediates without involvement of allyl-palladium complexes, and therefore the allylstannane product does not interfere with the palladium catalyst. Use of a combined catalytic system (1 + 2)