Trifluoroacetic acid → 5-bromo-4-fluoroisobenzofuran-1(3H)-one

To a flask charged with (3-bromo-2-fluorophenyl)methanol (840 mg, 4.1 mmol) and a stir bar was added added thallium trifluoroacetate (2.3 g, 4.3 mmol) and TFA (4.0 mL) at 0° C. The mixture was allowed to stir for 16 hours. LC showed no SM left at that point. The volatiles were removed under reduced pressure, and the residue was dissolved in DCM and concentrated twice to affect azeotropic removal of all TFA. After pumping the residue under high vacuum for 20 minutes, palladium chloride (73 mg, 0.41 mmol), lithium chloride (350 mg, 8.2 mmol), magnesium oxide (330 mg, 8.2 mmol), and MeOH (15 mL) were added to the flask. The mixture was treated under an atmosphere of CO for 2 hours. To this mixtue was added EtOAc to precipitate all the inorganic solids. The crude solution was filtered through a Celite® pad, and the filtrate was collected, adsorbed onto silica gel, and purified by silica gel chromatography. Removal of solvents gave rise to 5-bromo-4-fluoro-2-benzofuran-1(3H)-one. LC-MS (IE, m/z): 231 [M+1]+;

1. additionwas added
2. waitleft at that point
3. customThe volatiles were removed under reduced pressure
4. dissolutionthe residue was dissolved in DCM
5. concentrationconcentrated twice
6. customremoval of all TFA
7. customfor 20 minutes
8. additionThe mixture was treated under an atmosphere of CO for 2 hours
9. customto precipitate all the inorganic solids
10. filtrationThe crude solution was filtered through a Celite® pad
11. customthe filtrate was collected
12. custompurified by silica gel chromatography
13. customRemoval of solvents

ORD record

ord-82abb59f38284675984ad59b56281b47

Source dataset

uspto-grants-2015_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09056859B2