申请人:F. HOFFMANN-LA ROCHE AG
公开号:EP1067133A1
公开(公告)日:2001-01-10
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 105 to 3.5x107 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.
本发明涉及一种将式 I 的(S)或(R)或非外消旋形式的异构双(氧化膦)化合物外消旋化的新工艺。
(S)或(R)或非外消旋形式,制备光学活性双膦配体,该配体与过渡金属形成光学活性络合物。这些配合物在许多不对称反应中用作催化剂。
外消旋化是在高沸点或低沸点溶剂中,在 105 至 3.5x107 Pa 的常压或高压下进行的。加热是在可加热至 400°C 的系统(反应器、高压釜、铝块、带加热/搅拌幔的圆底烧瓶等)中进行的,或通过微波辐照,或在 260 至 400°C 的温度下,最好是 280 至 380°C 的温度下,分批或连续地在熔体中进行。