Internal Alkene Hydroaminations Catalyzed by Zirconium(IV) Complexes and Asymmetric Alkene Hydroaminations Catalyzed by Yttrium(III) Complexes
作者:Hyunseok Kim、Young Kwan Kim、Jun Hwan Shim、Misook Kim、Mijung Han、Tom Livinghouse、Phil Ho Lee
DOI:10.1002/adsc.200606171
日期:2006.12
dimethylamine. The neutral Zr(IV) complex 3 has been shown to be an effective precatalyst for intramolecular alkene hydroaminations that provide cyclic amines in good to excellent yields. A variety of chiral ligands (20, 22, 24, and 25–30) were prepared for asymmetric internal alkene hydroaminations. Metalation of chiral ligands to yttrium was accomplished with Y[N(TMS)2]3 in benzene-d6 or toluene-d8 to
通过使2,2-二甲基-1,3-丙二胺与二异丙基氯膦反应,然后加入硫,以68%的产率制备硫代次膦酰胺2。通过在苯-d 6或甲苯-d 8中用Zr(NMe 2)4直接金属化来实现配体2与锆的连接,从而通过消除二甲胺得到配合物3。中性Zr(IV)络合物3已被证明是分子内烯烃加氢胺化的有效预催化剂,该催化剂以良好或优异的产率提供环胺。多种手性配体的(20,22,24和25 – 30)制备用于不对称内部烯烃加氢胺化反应。用Y [N(TMS)2 ] 3在苯-d 6或甲苯-d 8中的手性配体金属化到钇,得到配合物。在苯-d 6(25°C,18 h)或甲苯-d 8(25°C,15 h)中用5 mol%的33处理7得到2,4,4-三甲基吡咯烷14,收率95%(61 %ee)。