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A solution of 4-fluorobenzylamine (20 g, 160 mmol) in ethyl formate was heated at reflux for 4 h. After cooling, the solvent was evaporated to afford a yellow solid. Trituration with cold EtOAc afforded the title compound as a white solid (17.46 g, 71%). 1H NMR (CDCl3): □8.24 (s, 1H), 7.25 (m, 2H), 7.00 (m, 2H), 5.91 (br s, 1H), 4.42 (d, 2H).

1. temperatureat reflux for 4 h
2. temperatureAfter cooling
3. customthe solvent was evaporated
4. customto afford a yellow solid