Synthesis of 1,3,4-Thiadiazolo[2′,3′:2,3]imidazo[4,5-b]indoles

Hitherto unknown thiadiazolo[2',3':2,3]imidazo[4,5-b]indoles were synthesized for the first time by base-mediated cyclo-condensation, bromination, and subsequent cyclization by two-fold Buchwald-Hartwig reactions.