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Gold(I) Complexes Nuclearity in Constrained Ferrocenyl Diphosphines: Dramatic Effect in Gold-Catalyzed Enyne Cycloisomerization.
Chemistry - An Asian Journal ( IF 3.5 ) Pub Date : 2020-07-20 , DOI: 10.1002/asia.202000579
Tuan-Anh Nguyen 1 , Julien Roger 1 , Houssein Nasrallah 1 , Vincent Rampazzi 1 , Sophie Fournier 1 , Hélène Cattey 1 , E Daiann Sosa Carrizo 1 , Paul Fleurat-Lessard 1 , Charles H Devillers 1 , Nadine Pirio 1 , Dominique Lucas 1 , Jean-Cyrille Hierso 1
Affiliation  

Di‐tert‐butylated‐bis(phosphino)ferrocene ligands bearing phosphino substituents R (R=phenyl, cyclohexyl, iso‐propyl, mesityl, or furyl) allow tuning the selective formation of Au(I) halide complexes. Thus, dinuclear linear two‐coordinate, but also rare mononuclear trigonal three‐coordinate and tetrahedral four‐coordinate complexes were formed upon tuning of the conditions. Both Au(I) chloride and rarer Au(I) iodide complexes were synthesized, and their X‐ray diffraction analysis are reported. The significance of the control of structure and nuclearity in Au(I) complexes is further illustrated herein by its strong effect on the efficiency and selectivity of gold‐catalysed cycloisomerization. Cationic linear digold(I) bis(dicyclohexylphosphino) ferrocenes outperform other catalysts in the demanding regioselective cycloisomerization of enyne sulphonamides into cyclohexadienes. Conversely, tetrahedral and trigonal cationic monogold(I) complexes were found incompetent for enyne cycloaddition. We used the two‐coordinate linear electron‐rich Au(I) complex 2 b (R=Cy) to extend the scope of selective intramolecular cycloaddition of different 1,6‐enyne sulfonylamines with high activity and excellent selectivity to the endo cyclohexadiene products.

中文翻译:

受约束的二茂铁基二膦中的金(I)络合物核:在金催化的烯炔环化中的显著作用。

二--butylated二(膦基)二茂铁的配体轴承膦取代基R(R =苯基,环己基,异丙基,三甲苯基,或呋喃基)可以调节金(I)卤化物络合物的选择性形成。因此,在条件调整时形成了双核线性二坐标,但也很少见的单核三角三坐标和四面体四坐标复合物。氯化金(I)和稀有的碘化金(I)均被合成,并对其X射线衍射分析进行了报道。本文通过其对金催化的环异构化的效率和选择性的强烈影响,进一步说明了Au(I)配合物中结构和核原子控制的重要性。在要求严格的烯炔磺酰胺区域选择性环异构化为环己二烯的过程中,阳离子线性二甲叉基(I)双(二环己基膦基)二茂铁的性能优于其他催化剂。反过来,发现四面体和三角阳离子单金(I)配合物不适合烯炔环加成。我们使用了两坐标线性富电子的Au(I)络合物2 B[R = CY)以扩展具有高活性和优异的选择性不同的1,6-烯炔sulfonylamines的选择性分子内环加成的范围环己二烯产物。
更新日期:2020-09-14
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