Diazo-bis-222-trifluoroethylmalonate was treated with a variety of alkenes under the influence of rhodium catalysis to yield the corresponding bis(2,2,2-trifluoroethyl)cyclopropane-1,1-dicarboxylates in good yields. These donor–acceptor cyclopropanes were found to have greatly enhanced electrophilicity in reactions with indole.
E. L. Armstrong and M. A. Kerr, Org. Chem. Front., 2015, 2, 1045 DOI: 10.1039/C5QO00176E
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