Methylamine → HCID 20544436, compound

Participants

Reaction Steps

To a stirred solution of 40% aqueous methylamine (9.0 ml) and water (9.0 ml) was added 2-(4-oxo-6-methyl-4H-pyran-3-yloxy)acetic acid (6.0 g) in small portions at room temperature. The mixture was stirred at the same temperature for 3 hours and concentrated. To the residue was added water (5 ml) and the mixture was adjusted to pH 3. The resulting precipitates were collected and washed with water to give crystals of 2-(1,6-dimethyl-4-oxo-1,4-dihydropyridin-3-yloxy)acetic acid (1.53 g), mp 240° to 242° C. The filtrate and the washings were combined together and adsorbed on Amberlite IRA-400 (Tradename, prepared by Rohm and Haas Co.) and eluted with water and then 0.3 N hydrochloric acid. The hydrochloric acid fraction was concentrated and dried to give crystals (3.7 g) of 2-(1,6-dimethyl-4-oxo-1,4-dihydropyridin-3-yloxy)acetic acid hydrochloride. The hydrochloride was dissolved in a small amount of water and the solution was adjusted to pH 3. The resulting crystals were collected by filtration and washed with water to give an additional amount of the same product (2.2 g) as obtained above.

Provenance & Evidence