Sodium Hydroxide → 2-Propenoic acid, 3-(4-aminophenyl)-, methyl ester

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Reaktionsschritte

A mixture of 3-(4-nitro-phenyl)-acrylic acid methyl ester (2) (39.54 g, 0.191 mol) and SnCl2.2H2O (220 g, 0.98 mol) in anhydrous ethanol (300 ml) was heated at 50° C. for 1 hour and at 75° C. for 1 hour. The reaction mixture was allowed to cool to 10° C., treated with 20% NaOH solution to pH 8-9, and extracted with ethyl acetate (3×200 ml). The organic extract was washed with saturated NaCl (3×150 ml), dried (MgSO4), and evaporated under reduced pressure. Recrystallization from isopropanol (180 ml) afforded pure title compound in a form of yellowish crystals (17.938 g, 53%). 1H NMR (DMSO-d6, HMDSO), δ: 3.64 (3H, s); 5.73 (2H, s); 6.22 (1H, d, J=16.0 Hz); 6.57 (2H, d, J=8.0 Hz); 7.38 (2H, d, J=8.0 Hz); 7.50 (1H, d, J=16.0 Hz).

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