反应详情

温度

110 °C

1,4-benzodioxan-2-ethylcarboxylate, (31.2 g, 150 -mmol) and piperazine (15.5 g, 180 mmol) were stirred under nitrogen and heated to 110° C. After 5 hours, the reaction was completed, which was confirmed by thin film chromatography. The crude product was cooled to room temperature, extracted with chloroform, washed with NaHCO3 solution and water. The organic layer was dried with anhydrous sodium sulfate, filtered to afford 34.96 g of compound 1 (94% yield).

1. extractionextracted with chloroform
2. washwashed with NaHCO3 solution and water
3. dry with materialThe organic layer was dried with anhydrous sodium sulfate
4. filtrationfiltered