反应详情

A round-bottom flask was charged with 4-fluoro-2-isopropoxy-1-nitrobenzene (49.3 g, 248 mmol), EtOH (600 mL), and 10% Pd/C (50% in water, Degussa type E101; 10 g, 20 wt % by weight of the starting nitro compound). The flask was sealed with a rubber septum, degassed, and back-filled with H2 (×3) from a balloon filled with H2. The reaction was stirred for 4 d using a H2 filled balloon. The reaction mixture was filtered through a pad of celite, and the pad of celite was rinsed with MeOH. The filtrate was evaporated to dryness to provide 4-fluoro-2-isopropoxybenzenamine (41.0 g, 98%) as a brown liquid that was used without further purification. 1H NMR (300 MHz; d6-DMSO) δ 6.67-6.72 (dd, 1H, J=2.7 Hz, 11 Hz), 6.55-6.60 (dd, 1H, J=6.0 Hz, 8.7 Hz), 6.43-6.49 (td, 1H, J=2.7 Hz, 8.4 Hz), 4.47-4.55 (m, 3H), 1.23-1.25 (d, 6H, J=6.0 Hz); 19F NMR (282 MHz; d6-DMSO) δ −127.4 (sextet); m/z=170 (M+H)+.

1. customThe flask was sealed with a rubber septum
2. customdegassed
3. additionback-filled with H2 (×3) from a balloon
4. additionfilled with H2
5. filtrationThe reaction mixture was filtered through a pad of celite
6. washthe pad of celite was rinsed with MeOH
7. customThe filtrate was evaporated to dryness