反应详情

To a stirred solution of 2-cyanoacetamide (689 mg, 8.2 mmol) in anhydrous EtOH (7.0 ml) at 75° C., was added 3-fluoropentane-2,4-dione (880 mg, 7.5 mmol), followed by piperidine (96 μl, 0.97 mmol). The reaction mixture was stirred at this temperature for 3 hours and the reaction mixture left to reach room temperature before being stored in the refrigerator for 4 days. The beige solid was collected by filtration and rinsed with cold EtOH (4×0.4 ml) until the filtrate ran clear. The resulting beige solid was dried in-vacuo at 40° C. for 5 hours to give the title compound (733 mg, 58%) as a beige solid. LC-MS 97%, 1.18 min (3.5 minute LC-MS method); m/z=166.9, 1H NMR (500 MHz, Chloroform-d) δ ppm 13.67 (br. s., 1H) 2.46 (d, J=2.05 Hz, 3H) 2.45 (d, J=2.84 Hz, 3H).

1. waitthe reaction mixture left
2. customto reach room temperature
3. waitbefore being stored in the refrigerator for 4 days
4. filtrationThe beige solid was collected by filtration
5. washrinsed with cold EtOH (4×0.4 ml) until the filtrate
6. customThe resulting beige solid was dried in-vacuo at 40° C. for 5 hours