A Combination of Visible-Light Organophotoredox Catalysis and Asymmetric Organocatalysis for the Enantioselective Mannich Reaction of Dihydroquinoxalinones with Ketones
作者:Jaume Rostoll-Berenguer、Gonzalo Blay、M. Carmen Muñoz、José R. Pedro、Carlos Vila
DOI:10.1021/acs.orglett.9b02157
日期:2019.8.2
An enantioselective photooxidative Mannich reaction of dihydroquinoxalinones with ketones by the merger of organophotoredox and asymmetric organocatalysis is described. This protocol features very mild reaction conditions using simple and cheap catalysts (Eosin Y and (S)-Proline) for the synthesis of chiral quinoxaline derivatives with good to high yields (up to 94%) and excellent enantioselectivities
描述了通过有机光氧化还原和不对称有机催化的结合,二氢喹喔啉酮与酮的对映选择性光氧化曼尼希反应。该方案具有非常温和的反应条件,使用简单且廉价的催化剂(曙红Y和(S)-脯氨酸)合成手性喹喔啉衍生物,具有良好至高产率(高达94%)和出色的对映选择性(高达99%ee) 。