Hydrochloric Acid → HCID 178472763, compound

Participants

Reaction Steps

7-Fluoro-4-hydroxy-thiochromen-2-one (2.0 g, 10.2 mmol) was dissolved in a mixture of triethylamine (1.7 mL, 12.23 mmol) and dichloromethane (50 mL). Isocyanato-acetic acid ethyl ester (1.4 mL, 12.23 mmol) was added to the solution and the reaction stirred overnight (18 h) at ambient temperature. The reaction mixture was acidified to pH 3 using 1N HCl and extracted with ethyl acetate. The organic phase was washed with brine, dried over sodium sulfate, and the crude residue purified by silica gel chromatography (10%-40% ethyl acetate in hexanes) to provide [(7-fluoro-4-hydroxy-2-oxo-2H-thiochromene-3-carbonyl)-amino]-acetic acid ethyl ester (900 mg, 30%). MS ESI(−) m/e: 324.117 (M−1).

Provenance & Evidence