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New substituted thieno-fused bicyclic compounds named (1H-pyrazol-3-yl)thieno[2,3-b]pyridin-4(7H)-one derivatives (4a,b), 2-([1,2,4]triazolo[1,5-a]pyrimidin-7-yl)-3-methyl-7-phenylthieno[2,3-b]pyridin-4(7H)-one (5), phenylthieno[2,3-b]pyridin-4(7H)-one derivatives (6a–c, 7a–c, and 8), and 3-(3-methyl-4-oxo-7-phenyl-4,7-dihydrothieno[2,3-b]pyridin-2-yl)-3-oxopropyl 4-chlorobenzoate (9) were synthesized by reacting the new enaminone (3) with different reagents. The chemical structure of the new molecules was determined by means of different spectroscopic methods such as NMR, IR, MS spectrometry, and by CHN analyses. The molecular structure of the 1,1′-(3-methyl-5-(phenylamino)thiophene-2,4-diyl)diethanone (2) was successfully solved by X-ray single crystal.

Synthesis and Characterization of Novel Thieno-Fused Bicyclic Compounds through New Enaminone Containing Thieno[2,3-b]pyridine Scaffold