Synthesis of Benzofuran-fused 1,4-Dihydropyridines <i>via</i>
Bifunctional Squaramide-catalyzed Formal [4+2] Cycloaddition of Azadienes with Malononitrile
作者:Zheng Gu、Bo Wu、Guo-Fang Jiang、Yong-Gui Zhou
DOI:10.1002/cjoc.201800330
日期:2018.12
An efficient bifunctional squaramide‐catalyzed Michael addition/cyclization of azadienes with malononitrile has been successfully developed, providing a facile access to chiral benzofuran‐fused 1,4‐dihydropyridines with excellent yields, wide substrate scope and up to 99% ee. Additionally, this formal [4+2] cycloaddition can be performed in gram scale without noticeable loss of yield and enantioselectivity
已经成功开发了一种高效的双功能方酰胺催化的丙二烯与丙二腈的迈克尔加成/环化反应,可轻松获得手性苯并呋喃稠合的1,4-二氢吡啶,收率高,底物范围广且ee可达99%。另外,该正式的[4 + 2]环加成反应可以以克为单位进行,而收率和对映选择性没有明显损失。