Ammonium Hydroxide → 4-Fluoro-2-hydroxybenzamide

DMF (2 drops) was added to a mixture of 4-fluorosalicylic acid (5 g, 32.0 mmol) and oxalyl chloride (7.11 mL, 80.1 mmol) in THF (35 mL). The mixture was stirred for 2 hours then reduced in vacuo. The residue was dissolved in THF (20 mL) and added dropwise to concentrated ammonium hydroxide solution (30 mL) at 0° C. The reaction was stirred at RT for 20 hours and the THF removed in vacuo. The residue was acidified and a white solid was filtered off. The solid was dissolved in ethyl acetate (80 mL) and the solution washed with water (50 mL), saturated sodium bicarbonate solution (50 mL), dried (MgSO4), and reduced in vacuo to give the desired compound as a yellow solid (2.4 g).

1. stirringThe reaction was stirred at RT for 20 hours
2. customthe THF removed in vacuo
3. filtrationa white solid was filtered off
4. dissolutionThe solid was dissolved in ethyl acetate (80 mL)
5. washthe solution washed with water (50 mL), saturated sodium bicarbonate solution (50 mL)
6. dry with materialdried (MgSO4)

ORD record

ord-b5173b59ffe647c3874af25244d27cca

Source dataset

uspto-grants-2011_05

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US07943607B2