Diphosphorus Ligands Containing a P‐Stereogenic Phosphane and a Chiral Phosphite or Phosphorodiamidite – Evaluation in Pd‐Catalysed Asymmetric Allylic Substitution Reactions
作者:Pau Clavero、Arnald Grabulosa、Mercè Rocamora、Guillermo Muller、Mercè Font‐Bardia
DOI:10.1002/ejic.201600550
日期:2016.9
derived from both enantiomers of 1,1′-bi-2-naphthol (5–9) and the chlorodiazaphosphepine derived from both enantiomers of N,N′-dimethyl-1,1′-binaphthyl-2,2′-diamine (10–14) in the presence of a base. With these ligands, cationic Pd complexes of the type [Pd(η3-C4H7)(PP′)]PF6 (Pd1–Pd14) were obtained and characterised; the crystal structures of Pd1, Pd2 and Pd13 were obtained. In solution, the complexes
报道了 14 种新的光学纯 C1 对称磷烷 - 次膦酸盐 (1-4)、磷烷 - 亚磷酸盐 (5-9) 和磷烷 - 亚磷酰胺 (10-14) 配体的合成。配体是通过 (2-羟基苯基) 苯基膦 PPh(2-PhOH)R(R = Me、tBu 和 Ph)与氯二异丙基膦(1 和 2)、氯二苯基膦(3 和 4)缩合制备的,氯代二氧膦衍生自两者1,1'-bi-2-naphthol (5-9) 的对映异构体和衍生自 N,N'-dimethyl-1,1'-binaphthyl-2,2'-diamine (10-14) 的两种对映异构体的氯代二氮杂膦在有基地的情况下。使用这些配体,获得并表征了 [Pd(η3-C4H7)(PP')]PF6 (Pd1–Pd14) 类型的阳离子 Pd 配合物;得到了Pd1、Pd2和Pd13的晶体结构。在解决方案中,由于配体缺乏对称性和甲代烯丙基的存在,复合物以两种非对映异构体的混合物形式存在。Pd