反应详情

Thionyl chloride (1.33 mL) is added dropwise to methanol (30 mL) under ice-cooling and the solution is stirred for 10 minutes. To the solution is added 4-hydroxycinnamic acid (3.0 g) and the mixture is stirred at room temperature for 4 days. The reaction mixture is concentrated and the residue is diluted with ethyl acetate (50 mL), washed successively with a saturated sodium hydrogencarbonate solution and saturated brine, dried over anhydrous sodium sulfate, and concentrated in vacuo. The residue is re-crystallized from ethyl acetate/n-hexane to methyl 4-hydroxycinnamate (2.86 g, yield; 88%) as pale yellow crystals.

1. temperaturecooling
2. stirringthe mixture is stirred at room temperature for 4 days
3. concentrationThe reaction mixture is concentrated
4. additionthe residue is diluted with ethyl acetate (50 mL)
5. washwashed successively with a saturated sodium hydrogencarbonate solution and saturated brine
6. dry with materialdried over anhydrous sodium sulfate
7. concentrationconcentrated in vacuo