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
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
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.