Synthesis and Characterization of New Biphenolate and Binaphtholate Rare-Earth-Metal Amido Complexes: Catalysts for Asymmetric Olefin Hydroamination/Cyclization
作者:Denis V. Gribkov、Kai C. Hultzsch、Frank Hampel
DOI:10.1002/chem.200304975
日期:2003.10.6
Ln(biphen)[N(SiHMe(2))(2)](thf) fragments are connected through bridging phenolate groups of the biphenolate ligands. The two different phenolate groups undergo an intramolecular exchange process in solution leading to their equivalence on the NMR timescale. All complexes were active catalysts for the hydroamination/cyclization of aminoalkynes and aminoalkenes at elevated temperature, with [Y((R)-dip(2)bino)[N
可以通过处理[Y [N(SiHMe(2))(2)]以高收率制备单体二醇盐酰胺钇络合物[Y [二醇盐] [N(SiHMe(2))(2)](thf)(2)]。 ](3)(thf)(2)]与3,3'-二叔丁基-5,5',6,6'-四甲基-1,1'-联苯-2,2'-二醇( H(2)(Biphen)),3,3'-双(2,4,6-三异丙基苯基)-2,2'-二羟基-1,1'-二萘基(H(2)(Trip(2)BINO) )或外消旋和对映纯形式的3,3'-双(2,6-二异丙基苯基)-2,2'-二羟基-1,1'-二萘基(H(2)(Dip(2)BINO))。外消旋复合物[Y(biphen)[N(SiHMe(2)(2)] [thf](2)]在加热时二聚,得到杂手性复合物(R,S)-[Y(biphen)[N(SiHMe (2))(2)](thf)](2)。相应的二聚异手性镧配合物是H(2)(Biphen)与[La