Hydrochloric Acid → HCID 14719508, compound

Participants

Reaction Conditions

Reaction Steps

Under argon atmosphere, a solution of ethyl chlorocarbonate (7.65 ml) in methylene chloride (90 ml) was cooled to -15° C., and to the solution was added dropwise a solution of 2-hydroxy-3-n-propyl-4-methoxybenzoic acid (8 g) and triethylamine (11.1 ml) in methylene chloride (160 ml) for 30 minutes, and the mixture was agitated for another 15 minutes. 2-thiophenemethylamine (4.7 ml) was added to the mixture and the mixture was agitated for 3 hours while the temperature of the mixture was elevated to 0° C. The reaction mixture was poured into 1N aqueous hydrochloric acid, and extracted with methylene chloride. The organic layer was washed with a mixed solution of saturated aqueous solution of sodium chloride and saturated aqueous solution of sodium bicarbonate, dried over anhydrous magnesium sulfate, and concentrated in evacuated atomosphere. The residue was dissolve in methanol (100 ml), and the solution was cooled to 0° C. The solution was added to 8.5% aqueous solution of sodium hydroxide (50 ml) and the mixture was agitated at room temperature for 4.5 hours. The reaction mixture was acidified by adding 6N aqueous hydrochloric acid thereto, and extracted twice with ethyl acetate. The organic layer was washed with saturated aqueous solution of sodium chloride, dried over anhydrous magnesium sulfate, and concentrated in evacuated atomosphere. The residue was subjected to column chromatography using silica gel, and there was obtained N-(2-hydroxy-3-n-propyl-4-methoxybenzoyl)-2-thiophenemethylamine (5.7 g) from fractions eluted with n-hexane-methylene chloride (2:1).

Provenance & Evidence