Vanishing aromaticity: A chiral ruthenium complex catalyzes the hydrogenation of 2,6‐ or 2,7‐disubstituted naphthalenes to give chiral tetralins with up to 92 % ee. The chiral catalyst is applicable to the regio‐ and enantioselective reduction of 6‐substituted 2‐alkoxynaphthalenes and preferentially hydrogenates the alkoxy‐substituted arene rings.
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。