Heteroacenes (thieno[3,2-b:4,5-b′]diindoles and benzothieno[3,2-b]indoles) were efficiently synthesized from tetrabromothiophene and 2,3-dibromobenzothiophene in two steps, respectively. In the first step, a site-selective Pd-catalyzed C–C coupling is carried out, followed by a two-fold C–N coupling with aromatic and aliphatic amines.
Organic & Biomolecular Chemistry
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