反应详情

Under ice-cooling, to formic acid (20 mL) was added dropwise triethylamine (29.6 mL). Then, 3,4-dimethoxybenzaldehyde (9.22 g) and Meldrum's acid (8.00 g) were added under ice-cooling, and the mixture was stirred at room temperature for 18 hr. The reaction mixture was poured into a mixture of ice (80 g) and 1 mol/L hydrochloric acid (50 mL), and the precipitate was collected by filtration to give the title compound (14.4 g) as a white solid.

1. temperaturecooling
2. filtrationthe precipitate was collected by filtration