Oxidative asymmetric umpolung alkylation of Evans’ β-ketoimides using dialkylzinc nucleophiles
Umpolung alkylation of Evans’ auxiliary substituted β-ketoimides affords the diastereomerically pure products in yields ranging from 40 to 80%. The reaction itself proceeds with diastereoselectivities between 3 : 1 and 18 : 1. Dialkylzinc serves as the nucleophile and umpolung of the β-keto-imide enolate is achieved by the action of Koser's reagent.
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