Challenging asymmetric alkene cyclopropanation by unsymmetrical diazomalonates

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