反应详情

温度

0 °C

A solution of 4-azido-5-fluoropyridine-3-carbaldehyde (3.00 g, 18.07 mmol) and 2,6-dichloro-4-nitroaniline (3.74 g, 18.07 mmol) in DCM (60 mL) was cooled to 0° C., under an atmosphere of nitrogen. Triethylamine (7.56 mL, 54.2 mmol) was added, followed by dropwise addition of titanium (IV) chloride solution (1 N in DCM, 10.8 mL, 10.8 mmol). The reaction mixture was stirred at 0° C. for 3 hours, then allowed to reach room temperature over 1 hour. The resultant mixture was concentrated under reduced pressure and the residue was dissolved in ethyl acetate and filtered through a pad of Celite®. The filtrate was concentrated under reduced pressure to afford the crude title compound as a yellow/brown solid (5.89 g, 92% yield). LCMS (Method C): RT=4.08 min, m/z: 327 [M+H+−N2].

1. waitto reach room temperature over 1 hour
2. concentrationThe resultant mixture was concentrated under reduced pressure
3. dissolutionthe residue was dissolved in ethyl acetate
4. filtrationfiltered through a pad of Celite®
5. concentrationThe filtrate was concentrated under reduced pressure