Synthesis of substituted 4-hydroxy-1H-thieno[2,3-b;4,5-b′]dipyridin-2-ones

Article abstract of DOI:10.1007/BF02494687

Substituted 4-hydroxy-1H-thieno[2,3-b;4,5-b′]dipyridin-2-ones were prepared by the reactions of 3-cyanopyridine-2(1H)-thiones with alkyl 4-chloroacetoacetates and by intramolecular cyclization of alkyl 4-(2-pyridylthio)acetoacetates or alkyl 3-(3-aminothi