Reaction of functionalized azomethine ylides with acetylenic dipolarophiles: the facile synthesis of functionalized 2H- and 1H-pyrroles
作者:Keisuke Kawashima、Masanori Hiromoto、Kyohei Hayashi、Akikazu Kakehi、Motoo Shiro、Michihiko Noguchi
DOI:10.1016/j.tetlet.2006.12.018
日期:2007.2
The reaction of functionalized azomethine ylides as C-unsubstituted nitrile ylide equivalents with acetylenic dipolarophiles is mentioned. Therein, the initially formed cycloadducts, 2,5-dihydropyrroles, by the reaction of the azomethine ylides with substituted acetylenes, undergo a fission reaction to afford 2H-pyrroles and the parent heterocyclic system. Some 2H-pyrroles isomerized to 1H-pyrroles
提及了作为C-未取代的腈基当量基团的官能化的甲亚胺基化物与炔属双极性亲和剂的反应。其中,通过偶氮甲亚胺基化物与取代的乙炔的反应,最初形成的环加合物2,5-二氢吡咯经历裂变反应,得到2 H-吡咯和母体杂环体系。在热和酸性条件下,一些2 H-吡咯异构化为1 H-吡咯。