Binap-gold(I) trifluoroacetate as a bifunctional catalyst for the synthesis of chiral prolines through 1,3-dipolar cycloaddition of azomethine ylides |
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Authors: | María Martín-Rodríguez Carmen Nájera José M Sansano Feng-Liu Wu |
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Institution: | Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, E-03080-Alicante, Spain |
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Abstract: | Highly enantioselective 1,3-dipolar cycloadditions of amino acid-derived azomethine ylides with alkenes have been performed, for the first time, under gold-catalysis using (Sa)- or (Ra)-Binap-gold(I) trifluoroacetate complexes, with the cationic Binap-gold acting as a Lewis acid and the counteranion as a base. Maleimides and trans-1,2-bis(phenylsulfonyl)ethylene were reacted with imino esters at room temperature in the absence of a base to afford, in very good yields, the corresponding polysubstituted prolines with total endo-diastereoselection and higher enantioselectivities than the Binap-silver trifluoroacetate complex. |
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