Sodium Hydroxide → HCID 12274202, compound

Participants

Reaction Steps

A mixture of 3 g of ethyl 2-(5H-[1]benzothiopyrano[2,3-b]pyridin-7-yl)propionate and 0.48 g of sodium hydroxide is dissolved in a mixture of 25 ml of ethanol and 5 ml of water, and the solution is heated under reflux for 1.5 hours. The ethanol is distilled off under reduced pressure, and water is added to the residue. The mixture is made acid with acetic acid, and the crystalline precipitate is filtered off and recrystallized from aqueous dioxane to give 2.4 g of 2-(5H-[1]benzothiopyrano[2,3-b]pyridin-7-yl)propionic acid melting at 203°-204°C.

Provenance & Evidence