Acetone Cyanohydrin → HCID 178492040, compound

Participants

Reaction Steps

11.1 g (35 mmol) of 5-fluoro-1-(4-methoxyphenyl)-2-oxo-1,2-dihydroquinoxaline-3-carboxylic acid was dissolved in chloroform (300 mL), and to this solution, N,N-dimethylformamide (0.5 mL) and 6.7 g (53 mmol) of oxalyl chloride were added sequentially. The mixture was stirred for one hour at room temperature. After confirming the completion of the reaction, the solvent was distilled off under reduced pressure. The residue thus obtained was dissolved in chloroform (100 mL), and this solution was added dropwise at 0° C. over 5 minutes to a solution prepared by dissolving 4.4 g (39 mmol) of 1,3-cyclohexanedione and 4.3 g (43 mmol) of triethylamine in chloroform (200 mL). The reaction solution was returned to room temperature and stirred for 3 hours, and then 1.5 g (18 mmol) of acetone cyanohydrin and 4.3 g (43 mmol) of triethylamine were added thereto. The mixture was stirred for 12 hours at room temperature. The reaction solution was washed with 10% hydrochloric acid and dried over anhydrous sodium sulfate, and then the solvent was distilled off under reduced pressure. The residue thus obtained was washed with methanol, to obtain 13.6 g (yield: 94%) of 5-fluoro-3-(2-hydroxy-6-oxo-1-cyclohexenecarbonyl)-1-(4-methoxyphenyl)-quinoxalin-2(1H)-one as a pale orange-colored powder.

Provenance & Evidence