Intramolecular Cyclization of Aminoalkynes Catalyzed by PdMo3S4Cubane Clusters

PdMo3S4 cubane clusters [(Cp*Mo)3(μ3-S)4Pd(L)][PF6] (Cp* = η5-C5Me5; L = dba (2), ma (3); dba = dibenzylideneacetone, ma = maleic anhydride) showed high catalytic activity for the intramolecular hydroamination of aminoalkynes to afford the corresponding cyclic imines in good yields under mild conditions. A molecular structure of 3 has been determined by X-ray diffraction study.