Solvent-dependent strong asymmetric amplification in the catalytic enantioselective Henry reaction using the trans-N,N'-bis-biphenyl-4-ylmethyl-cyclohexane-1,2-diamine-CuCl2 complex.

A strong asymmetric amplification was observed in the enantioselective Henry reaction catalyzed by the (R,R)-trans-N,N'-bis-biphenyl-4-ylmethyl-cyclohexane-1,2-diamine·CuCl2 complex in AcOEt, while no amplification occurred in MeOH.