Potassium Iodide → 3-Methoxy-4-(3-morpholinopropoxy)benzoic acid

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-hydroxy-3-methoxybenzoic acid (4.5 g, 26.8 mmol), 3-morpholinopropyl chloride (9.5 g, 58.0 mmol), (prepared according to J. Am. Chem. Soc. 1945, 67, 736), potassium carbonate (8.0 g, 58 mmol), potassium iodide (1.0 g, 0.22 mmol) and DMF (80 ml) was stirred and heated at 100° C. for 3 hours. The solid was removed by filtration and the volatiles were removed from the filtrate by evaporation. The residue was dissolved in ethanol (50 ml), 2M sodium hydroxide (50 ml) was added and the mixture was heated at 90° C. for 2 hours. After partial evaporation, the mixture was acidified with concentrated hydrochloric acid, washed with ether and then subjected to purification on a Diaion (trade mark of Mitsubishi) HP20SS resin column, eluting with water and then with a gradient of methanol (0 to 25%) in hydrochloric acid (pH2). Partial evaporation of the solvents and lyophilisation gave 3-methoxy-4-(3-morpholinopropoxy)benzoic acid (8.65 g, 97%).

Provenance & Evidence