Catalytic Asymmetric Hydrogenation of Heteroarenes and Arenes
作者:Ryoichi Kuwano
DOI:10.1080/10426507.2014.974752
日期:2015.6.3
ruthenium-catalyzed hydrogenation of various azoles to proceed with high enantioselectivity. The PhTRAP–ruthenium catalyst transformed indoles, pyrroles, imidazoles, and oxazoles into the corresponding chiral heterocycles. Naphthalenes are also reduced with hydrogen by the chiral ruthenium catalyst, exclusively giving tetralins. Some 2-alkoxytetralins were obtained with over 90% ee from the catalyticasymmetric hydrogenation
图形摘要 摘要 转螯合手性双膦 PhTRAP 允许钌催化的各种唑类氢化反应以高对映选择性进行。PhTRAP-钌催化剂将吲哚、吡咯、咪唑和恶唑转化为相应的手性杂环。萘也被手性钌催化剂用氢还原,专门得到四氢化萘。从相应的取代萘的催化不对称氢化中获得了一些具有超过 90% ee 的 2-烷氧基四氢化萘。
Catalytic Asymmetric Hydrogenation of 2,3,5-Trisubstituted Pyrroles
Catalytic asymmetric hydrogenation of N-Boc-protected pyrroles proceeded with high enantioselectivity by using a ruthenium catalyst modified with a trans-chelating chiral bisphosphine PhTRAP. The ruthenium catalyst prepared from Ru(eta3-methallyl)2(cod) and (S,S)-(R,R)-PhTRAP in the presence of triethylamine was the most enantioselective for the asymmetric hydrogenation of methyl pyrrole-2-carboxylate
通过使用用转螯合手性双膦 PhTRAP 改性的钌催化剂,N-Boc 保护的吡咯的催化不对称氢化以高对映选择性进行。在三乙胺存在下由 Ru(eta3-methallyl)2(cod) 和 (S,S)-(R,R)-PhTRAP 制备的钌催化剂对吡咯-2-羧酸甲酯的不对称氢化具有最大的对映选择性,得到所需的 (S)-脯氨酸衍生物,其 ee 为 79%,产率为 92%。此外,在 5 位带有大取代基的 2,3,5-三取代吡咯以 93-99.7% ee 氢化。4,5-二甲基吡咯-2-羧酸酯的不对称还原仅产生全顺式异构体,并在单个过程中产生具有高度立体控制的三个手性中心。这是吡咯的第一次高度对映选择性还原。