2-(4-Fluorophenyl)acetic acid → HCID 11345251, compound

Step AC (1): NaHMDS (1.0 M in THF, 100 mL, 100 mmol) was added to a stirred solution of 2-(4-fluorophenyl)acetic acid (7.71 g, 50.0 mmol) in THF (100 mL) at 0° C. The resulting mixture was aged for 20 min at 0° C. and neat 1-chloro-3-iodopropane (5.27 mL, 50.0 mmol) was added. The mixture was allowed to warm to rt. After 16 hr, the reaction was quenched with water (3 mL). The crude mixture was concentrated in vacuo. Aqueous NaOH (1 M, 150 mL) was added to the residue and the resulting mixture was extracted with Et2O (2×100 mL). The basic layer was acidified with aqueous HCl (1 M, 200 mL) and the resulting solution was extracted with Et2O (2×100 mL). The combined organic layers from the acidic extraction were washed with mixture of brine/1N HCl/sodium sulfite, dried (MgSO4), filtered, and concentrated in vacuo. The crude product was purified using silica gel column chromatography (0-10% EtOAc/hexane, linear gradient). The pure fractions were combined and concentrated to afford 5-chloro-2-(4-fluorophenyl)pentanoic acid (7.59 g, 29.6 mmol, 59% yield) as a light brown solid. 1H NMR (500 MHz, chloroform-d) δ ppm 7.30 (dd, J=8.55, 5.19 Hz, 2 H) 7.04 (t, J=8.70 Hz, 2 H) 3.58 (t, J=7.78 Hz, 1 H) 3.53 (t, J=5.80 Hz, 2 H) 2.21 (dddd, J=13.35, 10.45, 7.78, 5.34 Hz, 1 H) 1.90-2.01 (m, 1 H) 1.65-1.84 (m, 2 H).

1. waitAfter 16 hr
2. customthe reaction was quenched with water (3 mL)
3. concentrationThe crude mixture was concentrated in vacuo
4. additionAqueous NaOH (1 M, 150 mL) was added to the residue
5. extractionthe resulting mixture was extracted with Et2O (2×100 mL)
6. extractionthe resulting solution was extracted with Et2O (2×100 mL)
7. extractionThe combined organic layers from the acidic extraction
8. washwere washed with mixture of brine/1N HCl/sodium sulfite
9. dry with materialdried (MgSO4)
10. filtrationfiltered
11. concentrationconcentrated in vacuo
12. customThe crude product was purified
13. concentrationconcentrated

ORD record

ord-f24b7fbe29974ef8859bef554c2117ac

Source dataset

uspto-grants-2013_01

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08349880B2