Conjugate addition (Michael addition) of nucleophiles to α, β-unsaturated carbonyl compounds is one of the most important bond forming strategies in synthetic organic chemistry [1]. The versatility of the conjugate addition is due to the large variety of nucleophiles (organometallic reagents, other carbanions, heteroatoms, Michael donors) and acceptors (α, β-unsaturated carbonyl compounds, esters, nitriles and notroalkenes) that ...