反应详情

4-hydroxybenzaldehyde (30 g), ethyl cyanoacetate (31.7 g), acetic acid (4.5 ml) and ammonium acetate (1.9 g) were refluxed in ethyl alcohol (100 ml) for 4 hours with heating. After the reaction, the reaction solution was poured into 500 ml of ice water to separate crystals. The resulting crystals were recrystallized from methyl alcohol (400 ml) to obtain 65 g of ethyl 2-cyano-3-(4-hydroxyphenyl)acrylate which melted at 89° to 91° C. The resulting compound (10.9 g) and pyridine (4.3 g) were dissolved in tetrahydrofuran (100 ml), and acryloyl chloride (4.5 g) was added dropwise thereto. The reaction was carried out for 2 hours while keeping the reaction temperature below 40° C. After the reaction, the reaction solution was poured into ice water to separate crystals, and the resulting crystals were recrystallized from methyl alcohol (100 ml) to obtain 11 g of the desired compound which melted at 82° to 85° C. The desired compound was confirmed by the results of IR, NMR and elemental analysis.

1. temperaturewith heating
2. customAfter the reaction
3. customto separate crystals
4. customThe resulting crystals were recrystallized from methyl alcohol (400 ml)