Abstract
AbstractThe first metal‐free asymmetric 1,3‐dipolar cycloaddition of N‐arylmaleimides to azomethine ylides catalyzed by chiral tertiary amine thiourea to form multiply substituted pyrrolidines in excellent yields (up to 89 %) and enantioselectivities (up to 96 % ee) is presented. This procedure allows a rapid diversity‐oriented synthesis of chiral pyrrolidine derivatives with high optical purity.
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