Trans Effect on Cobalt Porphyrin Catalyzed Asymmetric Cyclopropanation

Abstract

A significant trans effect of potential coordinating additives was found in asymmetric cyclopropanation catalyzed by Co(II) complexes of D ₂ -symmetric chiral porphyrins [Co(1)]. Among different additives, substoichiometric amounts of DMAP resulted in substantial increases in both diastereoselectivity and enantioselectivity. A related solvent effect on the catalytic system was also observed.

Key words

cyclopropanation - chiral porphyrins - cobalt - trans effect - asymmetric catalysis

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