Synthesis of a novel ruthenium(ІІ) complex and its unique behaviors in enzymatic dynamic kinetic resolution of secondary alcohols
作者:Qihui Chen、Chengye Yuan
DOI:10.1016/j.tet.2010.03.069
日期:2010.5
was first prepared as an efficient catalyst in Candida Antarctica lipase B (CALB) mediated dynamic kinetic resolution (DKR) of secondary alcohols. With the aid of this ruthenium complex 3, (S)-1-phenylethanol was completely racemized within 25 min, and in combination with CALB, series of secondary alcohols bearing various functional groups were resolved in an efficient DKR manner. A detailed mechanism
首先制备了环戊二烯基苯甲酰基钌(ІІ)配合物3作为南迪假丝酵母脂肪酶B(CALB)介导的仲醇动力学动力学拆分(DKR)的有效催化剂。借助于该钌配合物3,(S)-1-苯基乙醇在25分钟内完全消旋,并与CALB结合,以有效的DKR方式拆分了一系列带有各种官能团的仲醇。提出了涉及C–H键激活的详细机制,以形成复合物3通过捕获此途径中的关键中间体。进行了相关的机理研究,以说明这种类型的DKR催化剂是基于仲醇的外消旋作用。其结构的新颖性,独特的催化性能以及在各种底物上的广泛应用以及更高的效率,使络合物3成为了DKR工艺中常用的那些络合物的重要替代品。