反应详情

Titanium tetrachloride (1M, 4.3 mL, 4.3 mmol) was added to a cooled (0° C.) mixture of 4-azidopyridine-3-carbaldehyde (1.06 g, 7.2 mmol), 2,6-dichloroaniline (1.17 g, 7.2 mmol) and triethylamine (3.0 mL, 21.6 mmol) in DCM (24 mL) under nitrogen. The resultant mixture was stirred for 3 hours at 0° C. before warming to room temperature and stirring for a further 3 hours. The reaction mixture was concentrated under reduced pressure. The residue was suspended in toluene and filtered though a pad of Celite®. The filtrate was concentrated to dryness under reduced pressure to afford the title compound as a yellow solid. This crude material was employed in the next step without further purification or analysis.

1. temperaturea cooled
2. concentrationThe reaction mixture was concentrated under reduced pressure
3. filtrationfiltered though a pad of Celite®
4. concentrationThe filtrate was concentrated to dryness under reduced pressure