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A mixture of 2,3-dihydrobenzodioxin-5-carboxaldehyde (Morishima, et al., Eur. Pat. Appl. 309,766, 5 Apr. 89) (9.25 g, 56.4 mmol), malonic acid (11.73 g, 112.8 mmol), pyrrolidine (1 mL), and pyridine (25 mL) was heated to reflux for 2 hr, cooled, and then poured into ice water (300 mL). The white precipitate was filtered, washed with 1N HCl, and air dried (9.83 g, 84.6%).

1. temperaturewas heated
2. temperatureto reflux for 2 hr
3. temperaturecooled
4. filtrationThe white precipitate was filtered
5. washwashed with 1N HCl, and air
6. customdried (9.83 g, 84.6%)