Studies On Rare Earth Metal Complexes Supported By CH₂SiBe₂-Bridged Diamido-Indenyl Ligands: Syntheses, And Structures, Hydroamination Catalysis

The CH₂SiMe₂-bridged diamido-indenyl ligand C₉H₇CH₂SiMe₂NHCH₂CH₂NMe₂（L1） has been synthesized. Some new rare earth metal complexes （η⁵:η¹:η¹-C₉H6CH₂SiMe₂NCH₂CH₂NMe₂）Ln[N（SiMe₃）₂], Ln=Y（1）, Sm（2）, Er（3）, Yb（4） wereobtained by treatment of [（Me₃Si）₂N]₃Ln（μ-Cl）Li（THF）₃with1equiv of L1. Thestructures of complexes1,2,3and4were established by single-crystal X-raydiffraction, elemental analysis and solution NMR studies. These new complexes wereevaluated high catalytic activity for the hydroamination/cyclization of aminoalkenes.The CH₂SiMe₂-bridged （1R,2R）-2-（dimethylamino）cyclohexylamino-indenylligand （L2） have been synthesized. Some new rare earth metal complexes containinga chiral diamido-indenyl ligand （η⁵:η¹:η¹-L2）Ln[N（SiMe₃）₂], Ln=Y（5）, Sm（6）, Er（7）,Yb（8） were obtained by treatment of [（Me₃Si）₂N]₃Ln（μ-Cl）Li（THF）₃with1equiv ofL2. The structure of complexe5was determined by single-crystal X-ray diffractionand solution NMR studies. These new complexes were evaluated as catalysts topromote the enantioselective hydroamination/cyclization of aminoalkenes in highactivity and good enantioselectivity. The complexe5gave the best result （85%ee）.