Asymmetric cyclopropanation of alkenes catalyzed by a rhodium chiral fortress porphyrin

The authors investigated the use of chiral rhodium porphyrin catalysts for the production of predominantly syn isomers in the cyclopropanation of alkenes. The reactions display good diastereoselectivity on some cases, but only modest enantioselectivities are observed. 15 refs., 3 figs., 1 tab.