The synthesis of phosphine oxide-linked bis(oxazoline) ligands and their application in asymmetric allylic alkylation
作者:Yu Jin、Da-Ming Du
DOI:10.1016/j.tet.2012.02.078
日期:2012.5
The phosphine oxide-linked bis(oxazoline) ligands were designed and synthesized in two ways. One is the coupling of Grignard reagent derived from 2-(2-bromophenyl)oxazoline with phenylphosphonic dichloride, another route is the condensation of bis(2-formylphenyl)(phenyl)phosphine oxide with chiral amino alcohols followed by NBS oxidation. These new bis(oxazoline) ligands were applied in Pd-catalyzed
设计和合成氧化膦连接的双(恶唑啉)配体。一种是衍生自2-(2-溴苯基)恶唑啉的格氏试剂与苯基二氯膦偶联,另一种途径是将双(2-甲酰基苯基)(苯基)膦氧化物与手性氨基醇缩合,然后进行NBS氧化。这些新的双(恶唑啉)配体用于钯催化的不对称烯丙基烷基化反应中,并用二苯基取代的配体(高达95%ee)获得了良好的收率和对映选择性。