Sodium Hydroxide → HCID 13234032, compound

Participants

Reaction Steps

13.0 g of 5-butyryl-3-hydroxy-6-methyloxindole-3-carboxylic acid ethyl ester are suspended in 200 ml of methanol and 85 ml of 2N sodium hydroxide solution are added. The mixture is stirred at room temperature for 90 minutes, the methanol is removed under reduced pressure, the mixture is acidified to pH 3-4 with 2N hydrochloric acid, filtered with suction, then the residue is washed with water, dissolved in ethyl acetate, dried over magnesium sulphate, concentrated to dryness by evaporation under reduced pressure, digested with a little methylene chloride and filtered with suction. 5-Butyryl-4-methylanthranilic acid having a melting point of 184°-186° is obtained.

Provenance & Evidence