The Hydrogenation/Transfer Hydrogenation Network: Asymmetric Hydrogenation of Ketones with Chiral η<sup>6</sup>-Arene/<i>N</i>-Tosylethylenediamine−Ruthenium(II) Catalysts
作者:Takeshi Ohkuma、Noriyuki Utsumi、Kunihiko Tsutsumi、Kunihiko Murata、Christian Sandoval、Ryoji Noyori
DOI:10.1021/ja0620989
日期:2006.7.1
Chiral eta6-arene/N-tosylethylenediamine-Ru(II) complexes, known as excellent catalysts for asymmetric transfer hydrogenation of aromatic ketones in basic 2-propanol, can be used for asymmetric hydrogenation using H2 gas. Active catalysts are generated from RuCl[(S,S)-TsNCH(C6H5)CH(C6H5)NH2](eta6-p-cymene) in methanol, but not 2-propanol, or by combination of Ru[(S,S)-TsNCH(C6H5)CH(C6H5)NH](eta6-p-cymene)
手性 eta6-芳烃/N-甲苯磺酰乙二胺-Ru(II) 配合物被称为芳香酮在碱性 2-丙醇中不对称转移氢化的优良催化剂,可用于使用 H2 气体的不对称氢化。活性催化剂由 RuCl[(S,S)-TsNCH(C6H5)CH(C6H5)NH2](eta6-p-cymene) 在甲醇中生成,但不是 2-丙醇,或通过 Ru[(S,S) -TsNCH(C6H5)CH(C6H5)NH](eta6-p-cymene) 和 CF3SO3H 或其他非亲核酸。该方法首次实现了简单酮在酸性条件下的不对称氢化。碱敏感的 4-色满酮及其衍生物与 S,S 催化剂在甲醇中以 1000-3000 (10 atm) 至 7000 (100 atm) 的底物与催化剂摩尔比进行氢化,得到 (S)-4 -色原醇与 97% ee 定量。该反应甚至可以在 2.4 kg 的规模上实现。