Methyl Anthranilate → N-(3',4'-dimethoxycinnamoyl)anthranilic acid

Participants

Reaction Steps

To a mixture of 20 ml of dioxane and 0.7 g of pyridine were added 2 g of 3,4-dimethoxycinnamic acid, 1.6 g of phosphorus oxychloride and 1.6 g of methyl anthranilate. The mixture was heated under reflux for 2 hours to effect reaction. After completion of the reaction, the reaction mixture was concentrated and the residue was dissolved with heating in ethanol and then cooled whereby crystals were precipitated. The crystals were separated by filtration and treated in a manner silimar to that described in Example 5 to effect hydrolysis of the ester group. The product was recrystallized from chloroform to obtain 2 g of N-(3', 4'-dimethoxycinnamoyl)-anthranilic acid having a melting point of 211°-213° C.

Provenance & Evidence