Iridium-Catalyzed Asymmetric Hydrogenation of Pyrrolo[1,2-<i>a</i>]pyrazinium Salts
作者:Wen-Xue Huang、Chang-Bin Yu、Lei Shi、Yong-Gui Zhou
DOI:10.1021/ol5013313
日期:2014.6.20
Highly enantioselective iridium-catalyzed hydrogenation of pyrrolo[1,2-a]pyrazinium salts has been achieved, providing a direct access to chiral 1,2,3,4-tetrahydropyrrolo[1,2-a]pyrazine derivatives with up to 95% ee. The key feature of the reaction is the addition of cesium carbonate, which increases the conversion and prohibits the racemization pathway of products.
吡咯并[1,2- a ]吡嗪鎓盐具有高度对映选择性的铱催化氢化作用,可直接获得高达95%的手性1,2,3,4-四氢吡咯并[1,2 - a ]吡嗪衍生物ee。该反应的关键特征是添加碳酸铯,这增加了转化率并阻止了产物的外消旋途径。