反应详情

To a solution of 4-amino-2-chloro-3-methyl-benzoic acid methyl ester (5.29 g, 26.5 mmol) in acetic acid (100 mL) was added isoamylnitrite (3.9 mL, 29.2 mmol). The reaction mixture was stirred at room temperature for 30 minutes then heated at reflux for 3 hours. The reaction mixture was concentrated in vacuo and the resultant residue subjected to flash chromatography (SiO2, gradient 0-100% ethyl acetate in cyclohexane) to yield the title compound as an off-white solid (2.26 g, 40%). 1H NMR (CDCl3, 400 MHz) 3.97 (3H, s), 7.42 (1H, d, J=8.8 Hz), 7.95 (1H, d, J=8.8 Hz), 8.29 (1H, s).

1. temperaturethen heated
2. temperatureat reflux for 3 hours
3. concentrationThe reaction mixture was concentrated in vacuo