oxazoline ring and a pyrrolidine unit were prepared in an efficient four-step synthesis starting from readily available chiral amino alcohols and proline. A study of these ligands in the asymmetric transfer hydrogenation of acetophenone showed that the catalysts formed from [Ir(cod)Cl]2 were the most active while those derived from [Ru(p-cymene)Cl2]2 gave the highest enantioselectivities (up to 61% ee)
从有效的手性
氨基醇和脯
氨酸开始,以有效的四步合成方法制备了同时结合有
恶唑啉环和
吡咯烷单元的新
配体类别的九个成员。对
苯乙酮不对称转移
氢化反应中的这些
配体的研究表明,由[Ir(cod)Cl] 2形成的
催化剂活性最高,而由[Ru(p- cymene)Cl 2 ] 2衍生的
催化剂具有最高对映选择性(高达61%ee)。