Titanium hydroamination catalysts bearing a 2-aminopyrrolinato spectator ligand: monitoring the individual reaction steps
作者:Katharina Weitershaus、Benjamin D. Ward、Raphael Kubiak、Carsten Müller、Hubert Wadepohl、Sven Doye、Lutz H. Gade
DOI:10.1039/b902038a
日期:——
ligand N(Xyl)N}(-) as the ancillary ligand, have been prepared and are shown to be pre-catalysts for the hydroamination of alkynes. The coordination of N(Xyl)N}(-) to titanium was achieved by reaction of [Cp*TiMe(3)] with the protioligand N(Xyl)NH giving [Cp*Ti(N(Xyl)N)(Me)(2)] (). Upon reaction of complex with an excess of tert-butylamine, the imido complex [Cp*Ti(N(Xyl)N)(N(t)Bu)(NH(2)(t)Bu)] () was
制备了一系列新的钛半三明治复合物,其中含有2-氨基吡咯啉基配体N(Xyl)N}(-)作为辅助配体,并被证明是炔烃加氢胺化的预催化剂。N(Xyl)N}(-)与钛的配位反应是通过[Cp * TiMe(3)]与部分配体N(Xyl)NH反应得到[Cp * Ti(N(Xyl)N)(Me) )(2)]()。在配合物与过量的叔丁胺反应后,形成亚氨基配合物[Cp * Ti(N(Xyl)N)(N(t)Bu)(NH(2)(t)Bu)]()。后者为合成一系列N-芳基取代的亚氨基络合物提供了准备。亚胺基配体与2,6-二甲基苯胺,2,4,6-三甲基苯胺以及2,6-二异丙基苯胺的交换在干净的反应中得到了相应的芳基酰亚胺络合物。钛亚氨基络合物[Cp * Ti(N(Xyl)N)(N(t)Bu)(NH(2)(t)Bu)]与末端芳基乙炔,例如苯乙炔和甲苯基乙炔的反应导致CH活化和炔基/酰胺基络合物的形成,而芳基酰亚胺基络合物又干净地进行了2