Synthesis of diverse di- to penta-substituted 1,2-dihydropyridine derivatives from gold(I)-catalyzed intramolecular addition of tertiary enamides to alkynes
作者:Xingyi Zhang、Xin-Ming Xu、Liang Zhao、Jingsong You、Jieping Zhu、Mei-Xiang Wang
DOI:10.1016/j.tetlet.2015.04.105
日期:2015.6
alkyne-bearing tertiary enamides underwent an efficient Au(I)-catalyzed 6-endo-dig cyclization reaction to afford a variety of di- to penta-substituted 1,2-dihydropyridine derivatives in high yields. The cyclization proceeds through a cascade comprising an intramolecular nucleophilic addition of enaminic carbon to alkyne–gold(I) complex, deprotonation, and protodeauration steps. Au(I)-catalyzed tertiary enamide–alkyne
随着3-氮杂-1,5-烯炔的作用,内部和末端带有炔烃的叔酰胺经历了有效的Au(I)催化的6-内-挖-环化反应,从而提供了多种二-至五取代的1,2-高产率的二氢吡啶衍生物。环化过程通过级联反应进行,该级联反应包括将烯胺碳分子内亲核加成到炔烃-金(I)络合物,去质子化和原型脱氢步骤。Au(I)催化的叔烯酰胺-炔烃环化反应以及连续的氧化芳构化反应提供了直接取代多取代吡啶的途径。