反应详情

A stirred suspension of 3-hydroxy-4-methoxybenzaldehyde (50 g) in water (200 mL) at between 0° and 5° C. is treated dropwise with an aqueous solution of sodium hydroxide (200 mL; 20% w/v), followed at between 0° and 5° C. by benzoyl chloride (38 mL). The reaction mixture is stirred at between 0° and 5° C. for 1 hour and then it is allowed to warm to room temperature and is stirred for a further period of 2 hours. The resulting solution is extracted with dichloromethane (2×200 mL) and the combined extract is washed with water (200 mL), dried over magnesium sulfate and concentrated, to give 2-methoxy-5-formylphenyl benzoate (35.2 g), m.p. 70°-72° C.

1. stirringis stirred for a further period of 2 hours
2. extractionThe resulting solution is extracted with dichloromethane (2×200 mL)
3. extractionthe combined extract
4. washis washed with water (200 mL)
5. dry with materialdried over magnesium sulfate
6. concentrationconcentrated