Synthesis and Properties of Dithieno-Fused 1,4-Azaborine Derivatives

The first synthesis of dithieno­[3,2-b:2′,3′-e]­[1,4]­azaborinine (DTAB) derivatives has been achieved by Buchwald–Hartwig coupling and subsequent Friedel–Crafts-type C–H borylation. A facile method for further π-extension of DTAB was also developed via stannylation and subsequent Kosugi–Migita–Stille cross-coupling reaction. The fundamental properties of DTAB derivatives were also investigated