Additive-Free Pd-Catalyzed α-Allylation of Imine-Containing Heterocycles
Author(s) -
Marko Kljajic,
Johannes Puschnig,
Hansjörg Weber,
Rolf Breinbauer
Publication year - 2016
Publication title -
organic letters
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.94
H-Index - 239
eISSN - 1523-7060
pISSN - 1523-7052
DOI - 10.1021/acs.orglett.6b03407
Subject(s) - chemistry , catalysis , imine , xantphos , lewis acids and bases , organic chemistry , combinatorial chemistry , medicinal chemistry , palladium
An additive-free Pd-catalyzed α-allylation of different imino-group-ontaining heterocycles is reported. The activation of α-CH pronucleophiles (pK a (DMSO) > 25) occurs without the addition of strong bases or Lewis acids using only the Pd/Xantphos catalyst system. The reaction scope has been studied for various 5- and 6-membered nitrogen-containing heterocycles (yields up to 96%). Mechanistic investigations suggest an initial allylation of the imine-N followed by a Pd-catalyzed formal aza-Claisen rearrangement.
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