Lithium Hydroxide → 4-(Quinoline-8-sulfonamido)benzoic acid

Beteiligte Stoffe

Reaktionsschritte

To a stirred solution of ethyl 4-(quinoline-8-sulfonamido)benzoate 90 (8 gm, 22.4 mmol) in THF:H2O (1:1) under nitrogen atmosphere was added solid LiOH (9.4 gm, 224 mmol) at RT. The solution was then refluxed for 6 hr. After completion of the reaction, the reaction mixture was washed with ethyl acetate (2×100 ml) to remove non polar impurities. The aqueous layer was acidified (pH 4) with citric acid solution. The resultant precipitate was filtered out and air-dried. The traces of water were removed by co-distillation with toluene. The resultant off white solid (5.9 gm, 80%) was taken to the next step without further purification.

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