反应详情

To a stirred solution of 2-phenylacetaldehyde (5.0 g, 32.3 mmol) and malonic acid (4.0 g, 38.8 mmol) in pyridine (25.0 mL) was added a catalytic amount of piperidine (0.64 mL, 6.46 mmol) then heated to reflux. After 3 h, the resulting mixture was cooled to room temperature and concentrated under reduced pressure. The crude product was slowly added 2N HCl. The white precipitate was filtered off and dried under vacuum to produce the title compound (3.5 g, 55˜80%)

1. temperaturethen heated to reflux
2. concentrationconcentrated under reduced pressure
3. filtrationThe white precipitate was filtered off
4. customdried under vacuum