<i>C</i><sub>2</sub>-Symmetric Bis(oxazolinato)lanthanide Catalysts for Enantioselective Intramolecular Hydroamination/Cyclization
作者:Sukwon Hong、Shun Tian、Matthew V. Metz、Tobin J. Marks
DOI:10.1021/ja0364672
日期:2003.12.1
C(2)-symmetric bis(oxazolinato)lanthanide complexes of the type [(4R,5S)-Ph(2)Box]La[N(TMS)(2)](2), [(4S,5R)-Ar(2)Box]La[N(TMS)(2)](2), and [(4S)-Ph-5,5-Me(2)Box]La[N(TMS)(2)](2) (Box = 2,2'-bis(2-oxazoline)methylenyl; Ar = 4-tert-butylphenyl, 1-naphthyl; TMS = SiMe(3)) serve as precatalysts for the efficient enantioselective intramolecular hydroamination/cyclization of aminoalkenes and aminodienes
[(4R,5S)-Ph(2)Box]La[N(TMS)(2)](2), [(4S,5R)-Ar 型 C(2)-对称双(恶唑啉根)镧系元素配合物(2)盒]La[N(TMS)(2)](2),和[(4S)-Ph-5,5-Me(2)盒]La[N(TMS)(2)](2) (Box = 2,2'-双(2-恶唑啉)亚甲基;Ar = 4-叔丁基苯基,1-萘基;TMS = SiMe(3)) 作为有效对映选择性分子内加氢胺化/环化氨基烯烃和氨基二烯的预催化剂. 这些新的催化剂体系是由已知的金属前体 Ln[N(TMS)(2)](3) 或 Ln[CH(TMS)(2)](3) (Ln = La, Nd, Sm, Y, Lu) 和 1.2 当量的市售或易于制备的双(恶唑啉)配体,例如 (4R,5S)-Ph(2)BoxH、(4S,5R)-Ar(2)BoxH 和 (4S)-Ph -5,5-Me(2)BoxH。[(4S)-