Synthesis, structure, and catalytic activity of binuclear lanthanide complexes with chiral NOBIN-based NNO ligands

Abstract

Abstract Two new amido binuclear complexes {( 1 )YN(SiMe 3 ) 2 } 2 · C 7 H 8 ( 3 · C 7 H 8 ) and {( 2 )SmN(SiMe 3 ) 2 } 2 · C 6 H 14 ( 4 · C 6 H 14 ) have been readily prepared in good yields by amine elimination reaction between Ln[N(SiMe 3 ) 2 ] 3 (Ln = Sm, Y) and chiral NNO ligands, ( S )-2-(pyridin-2-ylmethylamino)-2′-hydroxy-1,1′-binaphthyl ( 1 H 2 ) and ( S )-5,5′,6,6′,7,7′,8,8′-octahydro-2-(pyrrol-2-ylmethyleneamino)-2′-hydroxy-1,1′-binaphthyl ( 2 H 2 ), respectively. They both have been characterized by various spectroscopic techniques, elemental analyses, and X-ray diffraction analyses. They are active catalysts for asymmetric hydroamination/cyclization of aminoalkenes and ring-opening polymerization of rac -lactide, affording cyclic amines in excellent conversions with moderate ee values and isotactic-rich polylactides, respectively.