Catalytic asymmetric cyclopropanation at a chiral platform.

  title={Catalytic asymmetric cyclopropanation at a chiral platform.},
  author={Jian Gao and Frances Woolley and Ralph A. Zingaro},
  journal={Organic & biomolecular chemistry},
  volume={3 11},
Novel chiral Robson-type macrocyclic complexes M(2)-L [where M = Mn(II), Mn(III), Co(II) and Co(III) and L denotes tetra-Schiff base chiral ligands, L1 or L2] have been synthesized by metal template condensation of 2,6-diformyl-4-methyl-phenol, with 1R,2R-diaminocyclohexane (L1) or 1R,2R-diphenylethylenediamine (L2). The dinuclear Co(II) and Co(III) complexes catalyze asymmetric cyclopropanation of styrene with diazoacetate cooperatively and with high enantioselectivity. 

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