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Catalytic,Enantioselective α‐Alkylation of Azlactones with Nonconjugated Alkenes by Directed Nucleopalladation
Authors:Sri Krishna Nimmagadda  Mingyu Liu  Malkanthi K Karunananda  De‐Wei Gao  Omar Apolinar  Jason S Chen  Peng Liu  Keary M Engle
Abstract:A palladium(II)‐catalyzed enantioselective α‐alkylation of azlactones with nonconjugated alkenes is described. The reaction employs a chiral BINOL‐derived phosphoric acid as the source of stereoinduction, and a cleavable bidentate directing group appended to the alkene to control the regioselectivity and stabilize the nucleopalladated alkylpalladium(II) intermediate in the catalytic cycle. A wide range of azlactones were found to be compatible under the optimal reaction conditions to afford products bearing α,α‐disubstituted α‐amino‐acid derivatives with high yields and high enantioselectivity.
Keywords:Aminosä  uren  Dirigierende Gruppen  Enantioselektivitä  t  Palladium  Phosphorsä  uren
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