反应详情

温度

20 °C

7 ml (0.0507 mol) of triethylamine and 13.75 g (0.050 mol) of 2-bromo-4'-phenylaceto-phenone (Aldrich, Buchs, Switzerland; tech., Cat. no. 10,108-7) are added to a solution of 8.11 g (0.05 mol) of benzaldehyde guanylhydrazone in 40 ml of ethanol. The reaction mixture is stirred at 20° C. for 15 hours and is filtered, and the crystallizate is taken up in methylene chloride and acidified to pH 1 with 1N hydrochloric acid. After filtration, the filtration product is taken up in methanol, and 2N sodium hydroxide solution is added until a basic reaction is obtained (pH 11). Filtration is carried out and the crystalline product is washed with methanol/water (1:1). The title compound so obtained melts at 254°-255° C. (decomp.), 1H-NMR (DMSO): δ=8.60 (s, 1H); 8.10 (s, 1H); 7.93-7.98 (m, 2H); 7.67-7.83 (m, 6H); 7.32-7.55 (m, 6H); 6.24 (s, 2H).

1. filtrationis filtered
2. filtrationAfter filtration
3. addition2N sodium hydroxide solution is added until a basic reaction
4. customis obtained (pH 11)
5. filtrationFiltration
6. washthe crystalline product is washed with methanol/water (1:1)