Abstract

A catalytic asymmetric carbonyl-ene reaction of β,γ-unsaturated α-ketoesters with 5-methyleneoxazolines was accomplished. The process was based on the utilization of a chiral N,N'-dioxide/Mg(II) catalyst, providing the desired products with excellent outcomes (up to 99% yield, >99% ee) under mild reaction conditions. Based on the experimental investigations and previous reports, a possible transition state was proposed.

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