Dimethylformamide → Methyl 4-bromo-3-fluorobenzeneacetate

To a mixture of 2-(4-bromo-3-fluorophenyl)acetic acid (5 g, 21.46 mmol) in MeOH (50 mL) was added SOCl2 (1.879 mL, 25.7 mmol) and DMF (0.166 mL, 2.146 mmol). Then the mixture was stirred at 80° C. for 16 h. The mixture was concentrated and extracted with EA (100 mL×2) and washed with NaHCO3 (100 mL) to give the organic layer. The combined organic extract was washed with brine, dried over Na2SO4, filtered, and concentrated to yield a brown oil of methyl 2-(4-bromo-3-fluorophenyl)acetate (5 g, 17.20 mmol, 80% yield): 1H NMR (400 MHz, MeOH-d4) δ 7.53 (t, J=7.6 Hz, 1H), 7.15 (dd, J=1.6, 9.6 Hz, 1H), 7.04-6.99 (m, 1H), 3.67 (s, 3H), 3.65 (s, 2H); ES-LCMS m/z 249.0 (M+H+2).

1. concentrationThe mixture was concentrated
2. extractionextracted with EA (100 mL×2)
3. washwashed with NaHCO3 (100 mL)
4. customto give the organic layer
5. extractionThe combined organic extract
6. washwas washed with brine
7. dry with materialdried over Na2SO4
8. filtrationfiltered
9. concentrationconcentrated

ORD-Eintrag

ord-e890bcbf76284227bf16cd26aedd0f4d

Quelldatensatz

uspto-grants-2016_07

DOI

10.6084/m9.figshare.5104873.v1

Patentnummer

US09382238B2