Hydrochloric Acid → 2-[N'-(2,3-dibromo-8-oxo-5,6,7,8-tetrahydro-1H-pyrrolo[2,3-c]azepin-4-ylidene)-hydrazino]-benzoic acid

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Reaction Steps

To a solution of 2,3-dibromo-6,7-dihydro-1H,5H-pyrrolo[2,3-c]azepine-4,8-dione (32.2 mg, 0.10 mmol) in EtOH (5 mL) is added 2-hydrazinobenzoic acid (22.6 mg, 0.12 mmol) and HCl in i-PrOH (6N, 0.3 mL). The mixture is refluxed for 2 hours and then concentrated under reduced pressure. The residue is purified by HPLC (C18 column, eluted with CH3CN/H2O with 0.05% TFA) to give 2-[N′-(2,3-dibromo-8-oxo-5,6,7,8-tetrahydro-1H-pyrrolo[2,3-c]azepin-4-ylidene)-hydrazino]-benzoic acid; 1H NMR (DMSO-d6) δ 2.80-2.86 (m, 2H), 3.30-3.34 (m, 2H), 6.82 (t, 1H, J=8.0 Hz), 7.51 (d, 1H, J=7.2 Hz), 7.83-7.88 (m, 2H), 8.13 (t, 1H, J=6.0 Hz), 11.03 (s, 1H), 12.95 (s, 1H), 13.13 (s, 1H); m/z [M++1] 456.9.

Provenance & Evidence