2-Aminophenol → 4-Fluoro-N-(2-hydroxyphenyl)benzamide

Participants

Reaction Conditions

Reaction Steps

To a 500 ml 4 necked round bottom flask equipped with a thermometer, a mechanic stirrer, a drop funnel, a nitrogen in-let, was added sodium bicarbonate (29.6 g, 0.354 mol, 1.1 eq), 2-aminophenol (34.88 g, 0.32 mol, 1 eq) and 2-Methyl THF (250 ml). The temperature of the mixture was controlled under 20° C. by ice-bath. Under vigorously stirring, 4-fluorobenzoyl chloride (50.72 g, 0.32 mol, 1 eq) was added drop wise within 10 min. Then the reaction was allowed to be stirred for another 1.5 hrs. When HPLC data showed that less than 0.3% of 2-aminophenol remained, 100 ml of water and 50 ml of 2-methyl tetrahydrofuran was added to quench the reaction and then the mixture was heated to 60° C. with stirring. The mixture was partitioned into two phases and the organic phase was washed with 100 ml of 1N H2SO4 and subsequently with 100 ml of water. Then the solvent was evaporated to almost dryness with stirring.

Provenance & Evidence