Ethyl 5-bromo-4-nitrothiophene-2-carboxylate → Ethyl 4-aminothiophene-2-carboxylate

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Reaction Steps

A solution of ethyl 5-bromo-4-nitrothiophene-2-carboxylate (Int. 40) (500 mg, 1.785 mmol) in MeOH (35 ml) was hydrogenated in a continuous-flow hydrogenation reactor (H-Cube apparatus) (flow rate: 1.0 ml/min, Temp: 50° C., H2 pressure: 20 bar). The solvent was evaporated affording ethyl 4-aminothiophene-2-carboxylate (Int. 41) which was used without any additional purification (350 mg, MS/ESI+172.1 [MH]+).

Provenance & Evidence