反应详情

A solution of 3-fluoro-4-methoxybenzaldehyde [5.05 g, Intermediate (1)], nitromethane (5.3 mL) and ammonium acetate (6.3 g) in glacial acetic acid (60 mL) is heated at 110° C. for 16 hours, allowed to cool and poured into water (300 mL). The aqueous solution is extracted twice with EtOAc (200 mL). The combined extracts are washed with sodium bicarbonate solution (10%), with water, dried over sodium sulfate and evaporated affording 2-fluoro-1-methoxy-4-(2-nitro-vinyl)benzene [4.2 g, Intermediate (2)]. MS: 198 (M+H); 1H NMR (CDCl3): δ 7.9 (1H, d, J=10 Hz); 7.5 (1H, d, 10 Hz); 7.3 (2H, m); 6.95-7.15 (1H, m); 4 (3H, s).

1. temperatureto cool
2. extractionThe aqueous solution is extracted twice with EtOAc (200 mL)
3. washThe combined extracts are washed with sodium bicarbonate solution (10%), with water
4. dry with materialdried over sodium sulfate
5. customevaporated