Ammonium Chloride → 4,5,6,7-Tetrahydro-benzo[b]thiophene-2-carboxylic acid [3-(6-{3-amino-4-[(2-hydroxy-ethyl)-methyl-carbamoyl]-phenylamino}-4-methyl-5-oxo-4,5-dihydro-pyrazin-2-yl)-2-methyl-phenyl]-amide

Participants

Reaction Steps

4,5,6,7-Tetrahydro-benzo[b]thiophene-2-carboxylic acid [3-(6-{4-[(2-hydroxy-ethyl)-methyl-carbamoyl]-3-nitro-phenylamino}-4-methyl-5-oxo-4,5-dihydro-pyrazin-2-yl)-2-methyl-phenyl]-amide (5) (200 mg, 0.32 mmol) is dissolved in a mixture of ethanol (25 mL) and water (5.0 mL). Ammonium chloride (200 mg, 3.81 mmol) and iron powder (200 mg, 3.58 mmol) are then added and the reaction is allowed to proceed at 95° C. for 30 min. The reaction contents are then hot-filtered through celite and then transferred to a seperatory funnel with ethyl acetate (100 mL). The crude solution is then washed with saturated sodium bicarbonate (1×100 mL), then washed with saturated sodium chloride (1×100 mL) and dried over sodium sulfate. The solution is then filtered and concentrated under reduced pressure. The resulting residue is then triturated with DCM and ethyl ether to give 4,5,6,7-tetrahydro-benzo[b]thiophene-2-carboxylic acid [3-(6-{3-amino-4-[(2-hydroxy-ethyl)-methyl-carbamoyl]-phenylamino}-4-methyl-5-oxo-4,5-dihydro-pyrazin-2-yl)-2-methyl-phenyl]-amide (6) as an off-white solid (135 mg), m/z 587.20 (MH+).

Provenance & Evidence