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手性二胺修饰的Ru/γ-Al2O3催化剂催化芳香酮不对称加氢
Asymmetric Hydrogenation of Aromatic Ketones Catalyzed by Chiral Diamine Modified Ru/γ-Al2O3
【摘要】 研究了用手性修饰剂(1S,2S)-(-)-1,2-二苯基乙二胺修饰的负载型钌催化剂(Ru/γ-Al2O3)催化芳香酮的不对称加氢反应,在KOH的异丙醇溶液中,10~20℃,=5MPa条件下,芳香酮及其衍生物加氢产物的ee值达79.5%~85.0%,2-乙酰基噻吩加氢产物的ee值可达86.2%.此催化剂制备简单,容易与产物分离,重复使用4次,对映选择性基本保持不变.pH2
【Abstract】 Asymmetric hydrogenation of acetophenone and its derivatives, acetylpyridine, five-membered heterocyclic ketones catalyzed by [1S,2S-(-)-1,2-diphenyl-1,2-ethylenediamine] (S,S-DPEN) modified Ru/γ-Al2O3 catalyst was investigated. Under the reaction conditions of 10~20 ℃, p=5.0 MPa in KOH/i-PrOH solution, the ee value of aromatic alcohols produced from hydrogenation of acetophenone and its derivative could reach 79.5%~85.0%. The ee value of the hydrogenation product of 2-acetothiophene was 86.2% at 20 ℃ and p=7 MPa. .The catalyst was stable in air and could be easily separated from the product and reused several times without remarkable change of the enantioselectivity.
【Key words】 ruthenium; (1S,2S)-( - )-1,2-diphenyl-1,2-ethylenediamine; aromatic ketone; asymmetric hydrogenation; enantioselectivity;
- 【文献出处】 化学学报 ,Acta Chimica Sinica , 编辑部邮箱 ,2005年20期
- 【分类号】O643.32
- 【被引频次】14
- 【下载频次】316