反应详情

A stirred solution of 2-chloro-N-(2-chloro-3-fluoropyridin-4-yl)-6-nitrobenzamide (4.27 g, 12.9 mmol) in thionyl chloride (60 mL) was heated at 85° C. for 2 days under a nitrogen atmosphere. After cooling to room temperature, the volatiles were removed under reduced pressure and the resultant residue was purified by column chromatography on silica gel eluting with 0-30% ethyl acetate in petroleum ether (40-60° C.), to afford the title compound as a cream solid (3.90 g, 87% yield). 1H NMR (400 MHz, CDCl3): δ 8.27-8.20 (m, 2H), 7.88 (dd, J=1.1, 8.1 Hz, 1H), 7.66 (t, J=8.2 Hz, 1H), 6.95 (t, J=5.2 Hz, 1H).

1. customthe volatiles were removed under reduced pressure
2. customthe resultant residue was purified by column chromatography on silica gel eluting with 0-30% ethyl acetate in petroleum ether (40-60° C.)