反应详情

2,4-Difluoro-1-nitrobenzene (2.00 g, 12.57 mmol) was dissolved in acetonitrile (20 mL) and DIPEA (2.2 mL, 12.57 mmol) added, followed by isopropylamine (1.07 mL, 12.57 mmol). The bright yellow mixture was stirred at RT overnight. The resultant mixture was concentrated in vacuo and the residue purified by column chromatography (silica gel, gradient 0-5% EtOAc in cyclohexane) to afford the title compound as a yellow gum (2.1 g, 99%). Contaminated with some unreacted 2,4-difluoro-1-nitrobenzene, but used in the next step without any further purification. 1H NMR (CDCl3, 400 MHz): δ 8.20 (1H, dd, J=9.53, 6.21 Hz), 6.48 (1H, dd, J=11.71, 2.63 Hz), 6.33 (1H, m), 3.80-3.64 (1H, m), 1.33 (6H, d, J=6.36 Hz)

1. concentrationThe resultant mixture was concentrated in vacuo
2. customthe residue purified by column chromatography (silica gel, gradient 0-5% EtOAc in cyclohexane)