Challenging asymmetric alkene cyclopropanation by unsymmetrical diazomalonates

In this issue of Chem Catalysis, Wang et al. report the synthesis 1,1-cyclopropanediesters promoted by a D2-symmetric chiral amidoporphyrin catalyst. The carbene transfer from unsymmetrical diazomalonates to large scope challenging alkenes occurred with high stereocontrol thanks efficiency Co(II)-based metalloradical catalytic system.