Hydrochloric Acid → 3-Fluoro-4-hydroxy-5-iodobenzonitrile

Beteiligte Stoffe

Reaktionsschritte

Potassium iodide (7.97 g, 48 mmol) was dissolved in 125 ml of DMF with stirring, and 4-cyano-2-fluorophenol (16a; 5.56 g 48 mmol) and chloramine-T in 75 ml of DMF were added dropwise with stirring. The reaction mixture was poured into 650 ml of water, acidified with 6N HCl, and extracted with ethyl acetate. The organic layer was washed with 10% NaHSO3, water and brine and dried over magnesium sulfate. The organic solution was concentrated in vacuo and the yellow solid residue was treated with 200 ml of 1N NaOH solution, filtered through supercel, and the filtrate was acidified with conc. HCl solution. The solid product was filtered, dried, dissolved in ether, and the organic layer was dried over magnesium sulfate. The organic solution was concentrated in vacuo and the residue was recrystallized from ethylene chloride to afford 5.93 g (55.6%) of the title compounds.

Herkunft & Nachweise