Synthesis of 6H-Thieno[3,2-b]pyridin-7-ones from N-(2-X-Carbonyl)-3-thienyl Ketenimines (X = RS, ArO, R2N) via Consecutive [1,5]-X Sigmatropic Rearrangement and 6π-Electrocyclization
作者:Mateo Alajarín、Ángel Vidal、María-Mar Ortín
DOI:10.1055/s-2007-965874
日期:2007.2
N-(2-X-Carbonyl)-3-thienyl ketenimines (X = RS, ArO, R2N) undergo cyclization under thermal conditions, through a [1,5]-X sigmatropic rearrangement followed by a 6Ï-electrocyclic ring closure of the resulting intermediate ketene, to provide 6H-thieno[3,2-b]pyridin-7-ones, bearing alkylthio, arylthio, aryloxy or amino groups at their 5-position.
N-(2-X-Carbonyl)-3-thienyl ketenimines(X = RS、ArO、R2N)在热条件下通过[1,5]-X sigmatropic 重排发生环化反应,随后生成的中间烯酮发生 6Ï-电环闭环反应,生成 6H-噻吩并[3,2-b]吡啶-7-酮,在其 5-位上带有烷硫基、芳硫基、芳氧基或氨基。