Yb(OTf)3 Catalyzed Nucleophilic Conjugate Addition of Pyrrole to α,β-Unsaturated Ketones and Nitro-c

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Under the catalysis of Yb(OTf)3, nucleophilic conjugate addition of pyrrole to electron deficient olefins in CH2Cl2 at ambient temperature gives corresponding 2-alkylated pyrrole derivatives in good yields with high selectivity.
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