Synthesis of New tert‐Butyl‐ and Bromo‐functionalized [1,2,4]Triazino [5,6‐b]indole‐3‐thiols and Indolo[2,3‐b]quinoxalines

Abstract

In the present investigation, the synthesis of a series of structurally new and interesting tert‐butyl‐ and bromo‐functionalized [1,2,4]triazino[5,6‐b]indoles (6a–f) and indolo[2,3‐b]quinoxalines (8a–f) has been achieved, involving the condensation reaction of 7‐bromo‐5‐tert‐butylisatins (4a–f) with thiosemicarbazide (5) and benzene‐1,2‐diamine (7). The substrates 4a–f were prepared through bromination reaction of 5‐tert‐butylisatin (3) with NBS in PEG‐400 followed by alkylation reaction. The molecular structures of these newly synthesized compounds were elucidated on the basis of their elemental analyses and spectral data.