反应详情

A mixture of 1-ethoxy-2,5-difluoro-4-nitro-benzene (1.00 g, 4.92 mmol) and palladium on carbon (10%, 50% water, 307 mg) in ethanol (20 mL) were shaken in a hydrogenator under H2 atmosphere at 45 psi. After 30 minutes, solids were filtered off, washed with ethanol, and filtrate was concentrated to give 4-ethoxy-2,5-difluoro-phenylamine as a red solid (835 mg, 98%). 1HNMR (CDCl3, 400 MHz) δ 6.72-6.67 (m, 1H), 6.58-6.53 (m, 1H), 4.03-3.97 (q, J=7.0 Hz, 2H), 3.50 (s br, 2H), 1.41-1.37 (t, J=7.0 Hz, 3H). Exact mass calculated for C8H9F2NO 173.07 found 174.2 (MH+).

1. filtrationsolids were filtered off
2. washwashed with ethanol, and filtrate
3. concentrationwas concentrated