Iridium-Catalyzed H/D Exchange: Ligand Complexes with Improved Efficiency and Scope
作者:Michael Parmentier、Thomas Hartung、Andreas Pfaltz、Dieter Muri
DOI:10.1002/chem.201402078
日期:2014.9.1
could be labeled efficiently. With the addition of tris(pentafluorophenyl) borane to the reaction mixture, also highly deactivating nitrile substituents were well tolerated in the reaction. Based on the excellent results obtained with the chiral ThrePhox ligand, a structurally simpler, achiral ligand was developed. The iridium complex containing this ligand, proved to be a powerful catalyst for HIE reactions
氢同位素交换(HIE)是将氘或tri引入有机化合物的最有吸引力的工具之一。在此,已对具有N,P-配体的铱络合物(用于不对称双键还原的高活性催化剂)的HIE功能进行了测试。含有二环己基膦或次膦酸酯的富电子配体被认为是有效掺入氘的优异配体。具有强指导基团(即吡啶,酮和酰胺)以及弱连接单元(如硝基,砜和磺酰胺)的底物可以得到有效标记。通过向反应混合物中加入三(五氟苯基)硼烷,在反应中也很好地耐受了高度失活的腈取代基。基于使用手性ThrePhox配体获得的优异结果,开发了结构更简单的非手性配体。含有该配体的铱络合物被证明是HIE反应的有力催化剂。