Access to dihydropyridinones and spirooxindoles: application of N-heterocyclic carbene-catalyzed [3+3] annulation of enals and oxindole-derived enals with 2-aminoacrylates
作者:Liang-Liang Zhao、Xing-Shuo Li、Li-Li Cao、Rui Zhang、Xiao-Qian Shi、Jing Qi
DOI:10.1039/c7cc02753b
日期:——
A strategy for the NHC-catalyzed synthesis of dihydropyridinones and spirooxindoles has been developed via [3+3] annulation reactions of enals or isatin-derived enals with 2-aminoacrylates under oxidative conditions. In this efficient strategy, the 2-aminoacrylates served as nucleophiles. Modifying the standard base switched the carbon–carbon double bond formation from 5,6-positions to 3,4-positions
已经通过在氧化条件下烯类或靛红衍生的烯类与2-氨基丙烯酸酯的[3 + 3]环化反应,开发了一种NHC催化的二氢吡啶并酮和螺硫醇合成方法。在这种有效策略中,2-氨基丙烯酸酯用作亲核试剂。修改标准碱可以将碳-碳双键的形成从5,6-位置切换到3,4-位置,分别生成5,6-二氢吡啶酮和3,4-二氢吡啶酮。同时,还以良好至极好的收率合成了各种螺氧杂吲哚衍生物。