Synthesis of thio- and furan-fused heterocycles: furopyranone, furopyrrolone, and thienopyrrolone derivatives

ERGUN, Merve
Dengiz, Çağatay
OZER, Merve Sinem
ŞAHİN, Ertan
We report herein the synthesis of a novel class of compounds, ethyl 4-oxo-4H-furo[3,2-c]pyran-6-yl carbonate, (7E)-7-[(dimethylamino)methylene]-4H-furo[3,2-c]pyran-4,6(7H)-dione, 5-oxo-N-phenyl-2,5-dihydro-4H-furo[3,2-b]pyrrole-4-carboxamide,and 5-oxo-N-phenyl-5,6-dihydro-4H-thieno[3,2-b] pyrrole-4-carboxamide starting from the corresponding acid derivatives. Intramolecular cyclization in the presence of thionyl chloride formed the target fused ring systems. Additional transformation was seen in the cyclization of furan-fused heterocycle. A mechanism was proposed based on experimental and computational findings.


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Citation Formats
M. ERGUN, Ç. Dengiz, M. S. OZER, E. ŞAHİN, and M. BALCI, “Synthesis of thio- and furan-fused heterocycles: furopyranone, furopyrrolone, and thienopyrrolone derivatives,” TETRAHEDRON, pp. 5993–5998, 2014, Accessed: 00, 2020. [Online]. Available: