Acetic Acid → HCID 15591174, compound

Participants

Reaction Steps

In 5 ml of benzene was dissolved 1 g of methyl 3-oxo-5-(pyrrol-2-yl)-4-pentenoate and to this solution was added 0.74 g of N,N-dimethylformamidodimethylacetal. They were reacted at 70° C. for 1.5 hours. To the reaction mixture was then added 0.56 g of 4-hydroxyaniline, and they were further reacted at room temperature for 1 hour. The precipitated crystals were collected by filtration and dissolved in 10 ml of N,N-dimethylformamide. They were reacted at 140° C. for 3 hours. After completion of the reaction, the reaction mixture was cooled to room temperature and the solvent was removed by distillation under reduced pressure. The residue was purified by a column chromatography (Wako Silica Gel C-200; eluent: chloroform) to obtain an oily substance. This oily substance was dissolved in 10 ml of dioxane, and to this solution was added dropwise a solution of 0.54 g of 2,3,5,6-tetrachloro-p-benzoquinone in 5 ml of dioxane at 95° C. Thereafter, the mixture was subjected to reaction at the same temperature for 30 minutes, and the reaction mixture was cooled to room temperature. The precipitated crystals were collected by filtration, dissolved in a mixture of 5 ml of methanol and 10 ml of a 10% by weight aqueous sodium hydroxide solution, and they were reacted at room temperature for 30 minutes. After completion of the reaction, the reaction mixture was adjusted to a pH of 6.0 with acetic acid, and the precipitated crystals were collected by filtration, washed with water, and dried to obtain 0.3 g of 1-(4-hydroxyphenyl)-4-oxo-6-(pyrrol-2-yl)-1,4-dihydronicotinic acid having a melting point of 250° C. or more.

Provenance & Evidence