Screening of C2-symmetric chiral phosphinites as ligands for ruthenium(II)-catalyzed asymmetric transfer hydrogenation of prochiral aromatic ketones
作者:Duygu Elma、Feyyaz Durap、Murat Aydemir、Akin Baysal、Nermin Meric、Bünyamin Ak、Yılmaz Turgut、Bahattin Gümgüm
DOI:10.1016/j.jorganchem.2013.01.012
日期:2013.4
Metal-catalyzed transfer hydrogenation processes provide a widely-used alternative to direct hydrogenation processes of ketones. As part of an ongoing program, we report enantioselective C2-symmetric bis(phosphinite)–ruthenium(II) catalytic systems for the transfer hydrogenation of prochiral aromatic ketones. The new catalytic systems can readily be formed under in situ conditions from C2-symmetric chiral bis(phosphinite)
金属催化的转移加氢工艺为酮的直接加氢工艺提供了广泛使用的替代方法。作为正在进行的计划的一部分,我们报告了对映体选择性C 2对称双(次膦酸酯)-钌(II)催化体系,用于转移前手性芳族酮的氢化作用。新的催化体系可以容易地形成下原位条件从Ç 2 -对称的手性双(膦酸酯)的配体和的[Ru(η 6 - p -cymene)(μ-Cl)的CL] 2在转移氢化反应介质。这些手性钌催化剂体系可作为苯乙酮衍生物不对称转移加氢的催化剂前体。异-PrOH,得到相应的光学活性仲醇,其ee最高可达94%。