Abstract
N -(2-X-Carbonyl)-3-thienyl ketenimines (X = RS, ArO, R2 N) undergo cyclization under thermal conditions, through a [1,5]-X sigmatropic rearrangement followed by a 6π-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.
Key words
azides - ketenimines - rearrangements - ketenes - thienopyridines
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