1,2-Dichloro-3-isocyanatobenzene → 1-(5-tert-butyl-2-(5-oxo-1,4-diazepane-1-carbonyl)-1H-pyrrol-3-yl)-3-(2,3-dichloro-phenyl)urea

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The previously prepared 1-(4-amino-2-tert-butyl-1H-pyrrole-5-carbonyl)-1,4-diazepan-5-one (8 mg, 0.03 mmol) and 2,3 dichlorophenyl isocyanate (5 mg, 0.03 mmol) were dissolved in THF (2 mL) and heated at 70° C. for 2 hours. The reaction mixture was cooled down to room temperature, diluted with ethyl acetate, washed with saturated aqueous sodium bicarbonate, dried and the solvent eliminated under vacuum. The crude product was purified by preparative thin layer chromatography using a mixture of dichloromethane:methanol 9:1 as elution solvent to afford 7.0 mg of 1-(5-tert-butyl-2-(5-oxo-1,4-diazepane-1-carbonyl)-1H-pyrrol-3-yl)-3-(2,3-dichloro-phenyl)urea as a white solid. 1H NMR (400 MHz, acetone-d6): δ (ppm) 9.60 (bs, 1H); 8.60 (d, 2H); 8.26 (d, 1H); 7.30 (t, 1H); 7.20 (d, 1H); 6.84 (t, 1H); 6.59 (d, 1H); 3.76 (m, 2H); 3.70 (m, 2H); 3.40 (m, 2H); 2.61 (m, 2H); 1.37 (s, 9H).

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