反应详情

温度

100 °C

Piperidine (1.036 mL, 10.47 mmol) was added to a mixture of 4-bromothiophene-2-carbaldehyde (20 g, 105 mmol) and malonic acid (13.07 g, 126 mmol) at 80° C. under nitrogen atmosphere. The reaction mixture was stirred for 2 h at 100° C. The reaction mixture was cooled to room temperature and extracted with EA/water. The organic phase was washed with 2N NaOH. The aqueous phase was acidified and a precipitate was formed. The solid was stirred in a mixture of DCM and diisopropyl ether (1:1). The solid was sucked off and dried under reduced pressure to give a bright beige solid (12.3 g, 50.4%).

1. temperatureThe reaction mixture was cooled to room temperature
2. extractionextracted with EA/water
3. washThe organic phase was washed with 2N NaOH
4. customa precipitate was formed
5. customdried under reduced pressure