The synthesis and solid‐state characterization of an array of well‐defined low‐coordinate C1‐symmetric β‐diketiminatoiron(II) alkyl complexes B3–B6 featuring steric and electronic variations on one of the N‐aryl substituents of the β‐diketiminate ligand scaffold are reported. All complexes display unique catalytic abilities of promoting the selective exo‐cyclohydroamination of unprotected 2,2‐diph
一系列定义明确的低坐标C 1对称β-二酮基亚铁(II)烷基配合物B 3 - B 6的合成和固态表征,其β的N-芳基取代基之一具有空间和电子变异报道了二二酮配体支架。所有复合物显示促进选择性的独特的催化能力外未保护的2,2- diphenylpent -4-烯-1-胺(的-cyclohydroamination 1轻微的反应条件下)。在N之一上掺入潜在配位的邻甲氧基取代基β-二酮骨架的芳基环与另一个拥挤的2,6-二异丙基苯基结合,可提供比我们先前报道的C 2对称β-二酮基体铁(II)更活泼的催化剂(B 3)烷基络合物B(Ar 1 = Ar 2 = 2,4,6-(Me)3 C 6 H 2)/环戊基胺体系。通过比较研究可以推测,与B 4 - B 6相比,B 3的这种优越活性很可能是由于邻位效应和/或邻位配位能力引起的。-甲氧基取代基。还介绍了这种新颖的C 1对称β-二酮基亚氨基铁(II)烷基络合物B
Well-defined and easily accessible yttrium complexes for enantioselective cyclisation of amines tethered to 1,2-di-substituted alkenes
A straightforward in situ preparation of new chiral amido alkyl ate yttrium complexes is described. They catalysed the enantioselective cyclisation of 1,2-dialkyl-substituted aminopentenes in up to 77% ee, a significant value for this challenging transformation. Complex [(R)-L0][Y(CH2TMS)2·Li(THF)4] undergoes C–H bond activation resulting in the formation of an original dimeric heterobimetallic yttrium complex which also acts as an active precatalyst.
Metal-free aminoamidiniumation employing N-iodosuccinimide: facile syntheses of bicyclic imidazolidiniums and cyclic vicinal diamines
作者:Jun Zhang、Gengtao Zhang、Weijie Wu、Xuejun Zhang、Min Shi
DOI:10.1039/c4cc07082h
日期:——
NIS-mediated aminoamidiniumation has been developed for the syntheses of bicyclic imidazolidinium salts, which could be readily converted into 2-substituted pyrrolidine and indoline diamines.
to the formation of heteroleptic calcium or zinc complexes. All three compounds (1–3) were characterized by multinuclear (1H, 13C, 29Si) magnetic resonance spectroscopy, elemental analysis and single crystal X-ray diffraction methods. Solid state structures confirm that all are monomeric species. Furthermore, we have shown the catalytic application of these complexes for intramolecular hydroamination
混合胍基-酰胺基负载的钙,LCaN(SiMe 3)2 ∙2THF(1)[L = ArNC(N i Pr 2)NAr}(Ar = 2,6-Me 2 -C 6 H 3)]锌,LZnN(SiMe 3)2(2)和L 1 ZnN(SiMe 3)2(3)[L 1 = Ar'NC(N i Pr 2)NAr'}(Ar'= 2,6- i Pr 2 -C 6 H 3)]已通过盐复分解法合成。LH或L 1 H与两当量的THF中的KN(SiMe 3)2和当用CaI 2或ZnCl 2处理时所得的反应混合物之间的反应导致形成杂配钙或锌络合物。所有三种化合物(13通过多核)进行了表征(1个H,13 C,29Si)磁共振波谱,元素分析和单晶X射线衍射方法。固态结构证实所有都是单体物种。此外,我们显示了这些配合物在氨基烯烃分子内加氢胺化方面的催化应用。有趣的是,在没有任何其他活化剂(助催化剂)的情况下,化合物1表现出
A novel chiral yttrium complex with a tridentate linked amido-indenyl ligand for intramolecular hydroamination
作者:Zhuo Chai、Dezhi Hua、Kui Li、Jiang Chu、Gaosheng Yang
DOI:10.1039/c3cc47006g
日期:——
A new chiral silicon-linked tridentate amido-indenyl ligand was developed from indene and enantiopure 1,2-cyclohexanediamine. Its yttrium complex was synthesized, characterized and applied to efficiently catalyze the intramolecular hydroamination of non-activated olefins with up to 97% ee.