Asymmetric Synthesis of Trifluoromethylphenyl Cyclopropanes Catalyzed by Chiral Metalloporphyrins

The asymmetric addition of 2,2,2-trifluorodiazoethane to styrene derivatives to give optically active trifluoromethylphenyl cyclopropanes (ee values up to 69%) was carried out by using chiral iron and ruthenium porphyrins as homogeneous and heterogeneous catalysts.