This paper explored the intramolecular double Friedel–Crafts acylation strategy in approaching different types of novel fused heteroaromatic diones (12 samples using 2,2′-bithiophene, 2,2′-bifuran, 2,2′-biselenophene, and 2,2′-bipyrrole as cores) with 16%–85% yield.
W. Chen, S. Y. Tan, Y. Zhao and Q. Zhang, Org. Chem. Front., 2014, 1, 391 DOI: 10.1039/C4QO00032C
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