作者:Reinhard Nesper、Paul Pregosin、Kurt Püntener、Michael Wörle、Alberto Albinati
DOI:10.1016/0022-328x(95)05759-i
日期:1996.1
A series of mono- and di-cationic palladium(II) complexes containing different chiral tridentate nitrogen ligands, pybox, have been prepared [pybox = 2,6-bis[4′-(S)-iPr (or Ph, or Bz or p-EtOC6H4)oxazoline-2′-yl]pyridine (1–4), respectively]. The molecular structures for two of these, [Pd(CH3CN)(2)](BF4)2 (6) and [Pd(PPh3)(3)](BF4)2 (21g), have been determined by X-ray diffraction and show no major
制备了一系列含有不同手性三齿氮配体pybox的单和双阳离子钯(II)配合物[pybox = 2,6-bis [4'-(S)-i Pr(或Ph或Bz或对-EtOC 6 H 4)恶唑啉-2'-基]吡啶(1-4)]。其中[Pd(CH 3 CN)(2)](BF 4)2(6)和[Pd(PPh 3)(3)](BF 4)2(21)的分子结构g)已经通过X射线衍射确定并且在第四配位位置没有显示出主要的位阻。结合CNCH 2 CO 2 Me与PhCHO的醛醇缩合反应,还制备了几种新的异腈Pd II配合物。结果表明,在催化条件下,手性三齿pybox配体被完全置换,从而解释了其作为手性助剂的失败。一系列手性(21)配合物的制备细节[L = 4-甲基吡啶,2,6-二甲基吡啶,4-甲基苯胺,H 2 NCH 2 CH(OMe)2,H 2 NCH 2 CH 2 OH,H 2N(CH 2)5 CH 3,N 3 -,HCO