反应详情

Acetic anhydride (2.79 mL, 29.5 mmol), 5-amino-2-chloro-benzonitrile (3.00 g, 19.7 mmol), N,N-dimethylaminopyridine (0.241 g, 1.97 mmol), and toluene (50 mL) were combined and heated to reflux for 1.5 h. The reaction mixture was cooled, and water and EtOAc (150 mL) were added. The solid remaining in the mixture was collected and set aside. The aqueous layer was extracted once more with EtOAc, and the combined layers were washed with brine. The reserved precipitate was then dissolved in EtOAc, which was washed with brine. All organic layers were combined, dried, filtered, and concentrated. The residue was triturated with DCM/hexanes to yield the titled compound (3.52 g, 92% yield). This compound did not yield MS data. 1H NMR (400 MHz, CDCl3): 7.92 (d, J=1.0 Hz, 1H), 7.57 (dd, J=2.1, 1.2 Hz, 2H), 2.17 (s, 3H).

1. temperatureheated
2. temperatureto reflux for 1.5 h
3. temperatureThe reaction mixture was cooled
4. customwas collected
5. extractionThe aqueous layer was extracted once more with EtOAc
6. washthe combined layers were washed with brine
7. dissolutionThe reserved precipitate was then dissolved in EtOAc
8. washwhich was washed with brine
9. customdried
10. filtrationfiltered
11. concentrationconcentrated
12. customThe residue was triturated with DCM/hexanes