Methyl iodide → 2-(2-Methoxyphenyl)propanoic acid

As shown in step 4-i of Scheme 4, to a solution of diisopropylamine (6.70 g, 9.28 mL, 66.2 mmol) in THF (60 mL) at −78° C. under N2 was added n-butyllithium (33.1 mL of 2.0 M in cyclohexane, 66.2 mmol) and the solution was stirred for 40 minutes. A solution of 2-(2-methoxyphenyl)acetic acid (5.00 g, 30.1 mmol) in THF (30 mL) was added dropwise, then the reaction was allowed to warm to room temperature over one hour. The reaction was then cooled to −78° C. and iodomethane (4.27 g, 1.87 mL, 30.1 mmol) was added to the reaction in one portion. The reaction was warmed to room temperature 18 hours, 15 mL of water was added, and the organics were collected and the volatiles removed under reduced pressure. The residue was acidified with 1N HCl and the crude product extracted with Et2O (3×). The combined organics were dried over MgSO4, filtered, concentrated under reduced pressure, and the residue purified by medium pressure chromatography on silica gel (25 to 50% EtOAc in hexanes) to give 2-(2-methoxyphenyl)propanoic acid as a white solid (Compound 2008, 4.86 g, 85% yield): 1H NMR (CDCl3) δ 7.31-7.21 (m, 2H), 7.01-6.84 (m, 2H), 4.09 (q, J=7.2 Hz, 1H), 3.84 (s, 3H), 1.49 (d, J=7.2 Hz, 3H).

1. temperatureThe reaction was then cooled to −78° C.
2. temperatureThe reaction was warmed to room temperature 18 hours
3. customthe organics were collected
4. customthe volatiles removed under reduced pressure
5. extractionthe crude product extracted with Et2O (3×)
6. dry with materialThe combined organics were dried over MgSO4
7. filtrationfiltered
8. concentrationconcentrated under reduced pressure
9. customthe residue purified by medium pressure chromatography on silica gel (25 to 50% EtOAc in hexanes)

ORD record

ord-2eb7db9d9d1043479b3168f1adde1441

Source dataset

uspto-grants-2016_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09376448B2