Acetylacetone → 6-Bromo-2-methyl-4-nitro-1H-benzo[d]imidazole

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A mixture of 5-bromo-3-nitrobenzene-1,2-diamine (464 mg) and pentane-2,4-dione (400 mg) in EtOH (27 mL) and 5 N HCl (7.4 mL) was refluxed for 3 h. The mixture was cooled to room temperature and the solvent was removed in-vacuo. The residue was dissolved in EtOAc and washed with aqueous NaHCO3 solution and brine. The organic layer was concentrated to afford the desired product as a solid (460 mg, 90%). 1H NMR (300 MHz, CDCl3) δ ppm 2.73 (s, 3H), 8.11 (d, 1H, J=1.8 Hz), 8.24 (d, 1H, J=1.8 Hz), 10.20 (s, 1H, s); LC-MS: m/e=256 [M+1]+

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