Phosphorus oxychloride → 1-Benzyl-4,6-dichloro-2-oxo-1,2-dihydroquinoline-3-carbonitrile

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Reaction Steps

A solution of Compound 65 (2 g, 4.86 mmol) in 20 mL neat phosphorus oxychloride was heated to 90° C. for 5 h. The solvent was evaporated under reduced pressure. The residue was suspended in ice water and neutralized by solid sodium bicarbonate. The solids formed were filtered, washed by water, and purified by flash chromatography eluting with 1% methanol in dichloromethane to yield 810 mg (51%) of yellow solids. M.P. 243° C. 1H NMR (DMSO-d6): δ 5.55 (s, 2H), 7.25 (m, 3H), 7.32 (m, 2H), 7.56 (d, J=9.0 Hz, 1H), 7.85 (dd, J=2.1, 9.0 Hz, 1H), 7.89 (d, J=2.1 Hz, 1H). EIMS m/z 352 (M+23).

Provenance & Evidence