A Simple Metal-free Synthesis of 2,4,5-Trisubstituted Pyridines and Pyridine N-Oxides by [2+2] Cycloaddition of Enaminones to Propyne Iminium Salts
作者:Jure Bezenšek、Benjamin Prek、Uroš Grošelj、Amalija Golobič、Katarina Stare、Jurij Svete、Willi Kantlehner、Gerhard Maas、Branko Stanovnik
DOI:10.5560/znb.2014-4021
日期:2014.5.1
Herein a simple one-pot metal-free synthesis of 2,4,5-trisubstituted pyridines and pyridine Noxides by [2+2] cycloaddition of enaminones, which are prepared in situ from alkyl, aryl and heteroaryl methyl ketones using N,N-dimethylformamide dimethyl acetal (DMFDMA), and propyne iminium salts as electron-poor acetylenes, is described. Graphical Abstract A Simple Metal-free Synthesis of 2,4,5-Trisubstituted
本文通过烯胺酮的 [2+2] 环加成反应,简单地一锅无金属合成 2,4,5-三取代吡啶和吡啶氮氧化物,它们是使用 N,N- 由烷基、芳基和杂芳基甲基酮原位制备的描述了二甲基甲酰胺二甲基乙缩醛 (DMFDMA) 和丙炔亚胺盐作为缺电子乙炔。图形摘要 通过烯胺酮与丙炔亚胺盐的 [2+2] 环加成反应,简单无金属地合成 2,4,5-三取代吡啶和吡啶 N-氧化物