The More Gold-The More Enantioselective: Cyclohydroaminations of γ-Allenyl Sulfonamides with Mono-, Bis-, and Trisphospholane Gold(I) Catalysts
作者:Lara-Isabel Rodríguez、Torsten Roth、Julio Lloret Fillol、Hubert Wadepohl、Lutz H. Gade
DOI:10.1002/chem.201103140
日期:2012.3.19
highest activity and enantioselectivity (up to 95 % ee), whilst its mono‐ and dinuclear counterparts exhibited considerably lower enantioselectivities and activities. A similar trend was observed in a series of mono‐, di‐, and trinuclear 2,5‐dimethylphospholane gold(I) complexes. Aurophilic interactions were established from the solid‐state structures of the trinuclear gold(I) complexes, thereby raising
制备了一系列手性单核,二核和三核金(I)配合物,并将其用作N保护的γ-烯丙基磺酰胺的不对称环氢化胺化反应的预催化剂。立体定向的配体是单齿,双齿和三齿2,5-二苯基膦,分别具有C 1,C 2和C 3对称性,从而使二核和三核配合物中的催化位点对称。所述Ç 3 -对称三核络合物显示出最高的活性和对映选择性(高达95%的ee值),而其单核和双核对应物表现出相当低的对映选择性和活性。在一系列单核,二核和三核2,5-二甲基膦烷金(I)配合物中也观察到了类似的趋势。从三核金(I)配合物的固态结构建立了亲液相互作用,从而提出了一个问题,即这些次级力是否与观察到的不同催化行为有关。