3,3‘-Bis(trisarylsilyl)-Substituted Binaphtholate Rare Earth Metal Catalysts for Asymmetric Hydroamination
作者:Denis V. Gribkov、Kai C. Hultzsch、Frank Hampel
DOI:10.1021/ja058287t
日期:2006.3.1
Chiral 3,3'-bis(trisarylsilyl)-substituted binaphtholate rare earth metal complexes (R)-[LnBinol-SiAr3}(o-C6H4CH2NMe2)(Me2NCH2Ph)] (Ln = Sc, Lu, Y; Binol-SiAr3 = 3,3'-bis(trisarylsilyl)-2,2'-dihydroxy-1,1'-binaphthyl; Ar = Ph (2-Ln), 3,5-xylyl (3-Ln)) and (R)-[LaBinol-Si(3,5-xylyl)3}E(SiMe3)2}(THF)2] (E = CH (4a), N (4b)) are accessible via facile arene, alkane, and amine elimination. They are efficient
手性 3,3'-双(三芳基甲硅烷基)-取代的联萘金属络合物 (R)-[LnBinol-SiAr3}(o-C6H4CH2NMe2)(Me2NCH2Ph)] (Ln = Sc, Lu, Y; Binol-SiAr3 = 3,3'-双(三芳基甲硅烷基)-2,2'-二羟基-1,1'-联萘;Ar = Ph (2-Ln)、3,5-二甲苯基 (3-Ln)) 和 (R)-[ LaBinol-Si(3,5-二甲苯基)3}E(SiMe3)2}(THF)2] (E = CH (4a), N (4b)) 可通过芳烃、烷烃和胺轻松消除. 它们是氨基烯烃不对称加氢胺化/环化的有效催化剂,使用 (R)-2- 在 25 摄氏度下为 2,2-二苯基-戊-4-烯胺 (5c) 提供高达 840 h(-1) 的 TOF Y。在 5c 与 (R)-2-Sc 的环化中实现了高达 95% ee 的对映选择性。反应显示出明显的零级