Hydrogen Bromide → HCID 15591055, compound

Participants

Reaction Steps

In 10 ml of 47% by weight hydrobromic acid was suspended 0.3 g of 1-(2-fluoro-4-methoxyphenyl)-6-(4-dimethylaminophenyl)-4-oxo-1,4-dihydronicotinic acid, and the suspension was refluxed for 2 hours. After completion of the reaction, the reaction mixture was cooled to room temperature and diluted with 10 ml of water. The resulting solution was then adjusted to a pH of 12 with 20% by weight aqueous sodium hydroxide solution and washed with 20 ml of chloroform. The aqueous layer was adjusted to a pH of 6.0 with acetic acid, and the precipitated crystals were collected by filtration, washed with 10 ml of water, and dried to obtain 0.17 g of 1-(2-fluoro-4-hydroxyphenyl)-6-(4-dimethylaminophenyl)-4-oxo-1,4-dihydronicotinic acid having a melting point of 250° C. or more.

Provenance & Evidence