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  • Title: Functionalized 4-carboxy- and 4-keto-2,3-dihydropyrroles via Ni(II)-catalyzed nucleophilic amine ring-opening cyclizations of cyclopropanes.
    Author: Martin MC, Patil DV, France S.
    Journal: J Org Chem; 2014 Apr 04; 79(7):3030-9. PubMed ID: 24601622.
    Abstract:
    A general synthetic approach to vinylogous 4-carboxy- and 4-keto-2,3-dihydropyrroles is reported using Ni(ClO4)2·6H2O as a Lewis acid catalyst for nucleophilic amine ring-opening cyclizations of donor-acceptor (D-A) cyclopropanes. This methodology provided good to excellent yields of functionalized 2,3-dihydropyrroles under milder reaction conditions than previously reported and is amenable to a variety of D-A cyclopropanes and primary amines.
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