Synthesis and Application of Chiral Phosphino-Imidazoline Ligands: Ir-Catalyzed Enantioselective Hydrogenation
作者:Frederik Menges、Markus Neuburger、Andreas Pfaltz
DOI:10.1021/ol027253c
日期:2002.12.1
[reaction: see text] A series of chiral phosphino-imidazolines (PHIM ligands) 1a-j with different substituents at the stereogenic center, the nitrogen atom of the imidazoline ring, and at the phosphorus atom were synthesized. Iridium complexes derived from these ligands have been evaluated as catalysts for the enantioselective hydrogenation of unfunctionalized olefins. In several cases, higher enantiomeric
[反应:见正文]合成了一系列在立体异构中心,咪唑啉环的氮原子和磷原子上具有不同取代基的手性膦基咪唑啉(PHIM配体)1a-j。已经评估了衍生自这些配体的铱配合物作为未官能化烯烃的对映选择性氢化的催化剂。在一些情况下,观察到的对映体过量高于类似的膦基-恶唑啉配体。