Methyl 2,6-Difluoro-3-nitrobenzoate → Methyl 3-amino-2,6-difluorobenzoate

Participants

Reaction Steps

10% (wt.) Pd on activated carbon (4.46 g, 4.19 mmol) was added to a 1 L flask charged with methyl 2,6-difluoro-3-nitrobenzoate (18.2 g, 83.8 mmol) under an atmosphere of N2. Ethanol (350 mL, 0.25M) was added, and then H2 was passed through the reaction mixture for 15 minutes. The reaction mixture was then left to stir under two H2 balloons overnight. The following day, the reaction mixture was re-flushed with fresh H2 balloons and stirred an additional 4 hours. Upon consumption of the starting material and intermediate hydroxylamine as determined by TLC, N2 gas was flushed through the reaction mixture. The mixture was then filtered through glass microfibre filter (“GF/F”) paper twice. The volatiles were removed to afford methyl 3-amino-2,6-difluorobenzoate as an oil (15.66 g, 99%). The material was taken directly onto the next step.

Provenance & Evidence