反应详情

5.0 g of 7-hydroxy-3,4-dimethylcoumarin in 20 ml of diemthylformamide were added dropwise to a suspension of 0.9 g of NaH (80%) in 50 ml of dimethylformamide at room temperature. After 45 minutes, 3.5 g of 2-chloromethyl-5-methyl-1,3,4-oxadiazole, dissolved in 20 ml of dimethylformamide, were added and the mixture was stirred overnight at room temperature. The reaction solution was hydrolyzed with ice water, and the precipitated solid was filtered off under suction and recrystallized from methanol.

1. additionwere added
2. filtrationthe precipitated solid was filtered off under suction
3. customrecrystallized from methanol