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    • 1. 发明公开
    • Process for the racemization of atropisomeric bis (phosphine oxide) compounds
    • 雌二醇(膦酰基)维生素
    • EP1067133A1
    • 2001-01-10
    • EP00114219.9
    • 2000-07-03
    • F. HOFFMANN-LA ROCHE AG
    • Kienzle, FrankLalonde, MichelSchmid, RudolfWang, Shaoning
    • C07F9/53C07B55/00C07B57/00C07F9/50
    • C07F9/5329C07F9/5054
    • The present invention is concerned with a novel process for the racemization of atropisomeric bis(phosphine oxide) compounds of formula I
      in their (S) or (R) or non-racemic form, for the preparation of optical active bisphosphine ligands, which form optical active complexes with transition metals. These complexes are used as catalysts in a number of asymmetric reactions.
      The racemization is thermal and carried out in high or low boiling solvent, under normal or elevated pressure at 10 5 to 3.5x10 7 Pa. The heating is performed in a system which allows heating up to 400°C (reactor, autoclave, aluminum block, round-bottom flask with heating/stirring mantle and the like) or by microwave irradiation or in the melt at a temperature from 260 to 400°C, preferably from 280 to 380°C, batchwise or in a continuous manner.
    • 本发明涉及用于制备光学活性双膦配体的用于(S)或(R)或非外消旋形式的式I 的阻转异构双(氧化膦)化合物外消旋化的新方法, 其形成与过渡金属的光学活性配合物。 这些络合物用作许多不对称反应中的催化剂。 外消旋化是热和在高沸点溶剂或低沸点溶剂中,在正常或升高的压力下在10 -5至3.5×10 7 Pa下进行的。加热在允许加热至400℃(反应器, 高压釜,铝块,具有加热/搅拌罩等的圆底烧瓶)或通过微波照射或在260至400℃,优选280至380℃的温度下分批地或以连续方式 。