Fesulphos-Palladium(II) Complexes as Well-Defined Catalysts for Enantioselective Ring Opening of Meso Heterobicyclic Alkenes with Organozinc Reagents
作者:Silvia Cabrera、Ramón Gómez Arrayás、Inés Alonso、Juan C. Carretero
DOI:10.1021/ja055692b
日期:2005.12.1
The air-stable and readily available cationic methyl palladium(II) complexes of planar chiral Fesulphos ligands [(Fesulphos)Pd(Me)(PhCN)]+ X- are highly efficient catalysts for the alkylative ring opening of oxa- and azabicyclic alkenes with dialkylzinc reagents, showing broad scope with regards to both the bicyclic substrate and the dialkylzinc reagent. Catalyst loading as low as 0.5 mol % is sufficient
空气稳定且易于获得的平面手性 Fesulphos 配体 [(Fesulphos)Pd(Me)(PhCN)]+ X- 的阳离子甲基钯 (II) 配合物是用于氧杂和氮杂双环烯烃烷基化开环的高效催化剂二烷基锌试剂,在双环底物和二烷基锌试剂方面显示出广泛的范围。在大多数情况下,低至 0.5 mol% 的催化剂负载量足以实现良好的产率和对映选择性范围为 94 --> 99% ee。Fesulphos = (1-phosphino-2-sulfenylferrocene); X- = 四[3,5-双(三氟甲基)苯基]硼酸盐或PF6(-)]。}结合计算计算和X射线结构分析的机械研究已经合理化了高不对称感应的起源。