Diethyl Ether → 4-(2-amino-3H-imidazol-4-yl)-2,3-dichloro-4,5,6,7-tetrahydro-1H-pyrrolo[2,3-c]azepin-8-one

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Reaction Conditions

Reaction Steps

To a solution of 2,3-dichloro-4-hydroxy-4,5,6,7-tetrahydro-1H-pyrrolo[2,3-c]azepin-8-one (60 mg, 0.256 mmol), prepared as in reference 2, in methanesulfonic acid (0.5 mL) is added 2-aminoimidazole sulfate (40.5 mg, 0.153 mmol). The mixture is stirred at 45° C. overnight, cooled to room temperature and Et2O (5 mL) is added resulting in brown oil. After discarding the supernatant, the oil is purified by silica gel column chromatography and eluted with MeOH—CH2Cl2 to give 4-(2-amino-3H-imidazol-4-yl)-2,3-dichloro-4,5,6,7-tetrahydro-1H-pyrrolo[2,3-c]azepin-8-one; 1H NMR (Methanol-d4) δ 2.09-2.17 (m, 1H), 2.23-2.31 (m, 1H), 3.20-3.29 (m, 2H), 4.23 (t, 1H, J=3.6 Hz), 6.18 (s, 1H); m/z [M++1] 300.0.

Provenance & Evidence