Imidazole-catalyzed Three-component Cascade Reaction for the Facile Synthesis of Highly Substituted 3,4-Dihydropyridin-2-one Derivatives
作者:Zhiqiang Liu、Lu Tan、Qi Wu、Xianfu Lin
DOI:10.1002/cjoc.201200500
日期:2012.10
one‐pot protocol for the synthesis of valuable 3,4‐dihydropyridin‐2‐ones from the condensation of aldehyde with cyanoacetamide and 1,3‐dicarbonyl compounds in the presence of imidazole was developed. A series of aldehydes and 1,3‐dicarbonyl compounds were employed to examine the scope of substrates for this protocol. This reaction proceeded through the formation of one ring and four new bonds (two CC, one
开发了一种新颖的一锅法,用于在咪唑存在下由醛与氰基乙酰胺和1,3-二羰基化合物的缩合反应合成有价值的3,4-二氢吡啶-2-酮。一系列醛和1,3-二羰基化合物被用于检查该方案的底物范围。该反应通过一个环和四个新的键(两个C的形成进行 C,一种C 经由序列N,一个CC)涉及Knoevenagel缩合,Michael加成和分子内环化具有中度至良好的产率。所有新化合物均通过IR,1 H NMR,13 C NMR和HRMS表征。
Enzymatic multicomponent reaction for simultaneous synthesis of two important scaffolds, pyridin-2-ones and α-alkylated nitriles
作者:Zhi-Qiang Liu、Yu-Jing Hu、Xiao-Yang Chen、Qi Wu、Xian-Fu Lin
DOI:10.1016/j.tet.2014.12.021
日期:2015.1
An efficient approach for the synthesis of highly substituted pyridin-2-one derivatives and alpha-alkylated nitriles through enzymatic multicomponent reaction (MCR) was developed. This MCR involved biomimetic reduction between 3,4-dihydropyridin-2-one and activated olefin, both of which were in situ generated in the Acylase Amano (AA)-catalyzed domino reaction starting from benzaldehyde, cyanoacetamide and ketone. A wide range of substituted benzaldehydes and ketones were accepted by this reaction. Both final products (pyridin-2-one derivatives and alpha-alkylated nitriles) were important skeletons and synthetic intermediates. The synthetic application of prepared alpha-alkylated nitrile was demonstrated by converting it into the corresponding alpha-alkyl-beta(2)-amino acid with high yield. (C) 2014 Elsevier Ltd. All rights reserved.