Quinine-derived thiourea promoted enantioselective Michael addition reactions of 3-substituted phthalides to maleimides
作者:Jie Wang、Xin Li、Jin-Pei Cheng
DOI:10.1007/s11426-018-9393-2
日期:2019.5
A highly diastereoselective and enantioselective Michael addition/desymmetrization reaction of maleimides with prochiral 3- substituted phthalides catalyzed by quinine-derived bifunctional thiourea was realized. A broad range of the 3,3′-disubstituted phthalides bearing vicinal quaternary-tertiary stereogenic centers were synthesized in moderate to good yields (up to 96%) with high diastereoselectivities
实现了由奎宁衍生的双官能硫脲催化的马来酰亚胺与前手性3-取代的邻苯二甲酸酯的高度非对映选择性和对映选择性迈克尔加成/脱对称反应。以中等至良好的收率(高达96%),高非对映选择性(高达> 19:1 dr)和对映选择性(高达96)合成了范围广泛的带有邻位季三级立体异构中心的3,3'-双取代邻苯二甲酸酯。 :4 er)。