Alkyl Complexes of Lanthanum and Samarium Supported by a Chiral Binaphthylamido Ligand. Syntheses, Structures, and Catalytic Activity in Hydroamination of Amino-1,3-dienes
F)2(μ-Me)Li(THF)] (1) or tetranuclear [(R)-C20H12(NC5H9)2]La(μ-Me)2Li(THF)[(μ-Me)Li(THF)]2} (2) complexes with methyl ligands μ-bridging lanthanide and lithium atoms. The structures of complexes 1 and 2 were established by single-crystal X-ray diffraction and solution NMR studies. These new complexes were evaluated as catalysts to promote the enantioselective hydroamination of amino-1,3-dienes.
(R)-(+)-2,2'-双(环戊基氨基)-1,1'-联萘二胺与[Li(THF)n ] 3 [LnMe 6 ](Ln = La,Sm)在THF中的反应0°C取决于金属离子的大小,导致形成三核[(R)-C 20 H 12(NC 5 H 9)2 ] Sm [(μ-Me)2 Li(THF)2(μ-Me) Li(THF)](1)或四核[(R)-C 20 H 12(NC 5 H 9)2 ] La (μ-Me)2 Li(THF)[(μ-Me)Li(THF)]2 }(2)与甲基配体μ桥接镧系元素和锂原子的配合物。配合物1和2的结构是通过单晶X射线衍射和溶液NMR研究确定的。这些新的配合物被评估为催化剂,以促进对氨基-1,3-二烯的对映选择性加氢胺化。
Intramolecular Hydroamination/Cyclization of Conjugated Aminodienes Catalyzed by Organolanthanide Complexes. Scope, Diastereo- and Enantioselectivity, and Reaction Mechanism
作者:Sukwon Hong、Amber M. Kawaoka、Tobin J. Marks
DOI:10.1021/ja036266y
日期:2003.12.1
precatalysts for the rapid, regioselective, and highly diastereoselective intramolecularhydroamination/cyclization of primary and secondary amines tethered to conjugated dienes. The rates of aminodiene cyclizations are significantly more rapid than those of the corresponding aminoalkenes. This dienyl group rate enhancement as well as substituent group (R) effects on turnover frequencies is consistent with