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Beilstein J. Org. Chem. 2011, 7, 1533–1540, doi:10.3762/bjoc.7.180
Graphical Abstract
Scheme 1: PEG-400 catalyzed ultrasound-assisted Rap–Stoermer synthesis of 3-(2-benzofuroyl)carbazoles 3a–k.
Scheme 2: Synthesis of naphtho[2,1-b]furoyl-N-ethyl-9H-carbazole 3l and 5l.