Hydrochloric Acid → 2-(4-Cyclopropylphenyl)acetic acid

Methyl 2-(4-cyclopropylphenyl)acetate (3.10 g, 16.30 mmol) was dissolved in a mixture of THF/MeOH/water (2:2:1, 80 mL), and the solution was treated with lithium hydroxide hydrate (0.8548 g, 20.37 mmol). The mixture was then stirred at ambient temperature for 4 hours. The reaction mixture was neutralized to a pH of 4 with 3N HCl and concentrated in vacuo. The solids were re-dissolved in ethyl acetate and water. The pH was re-adjusted to a pH of about 3 to about 4 with 3N HCl. The layers were then separated. The aqueous layer was washed with ethyl acetate (2×). The combined organic layers were then washed with saturated NaCl, dried over Na2SO4 and concentrated to yield 2-(4-cyclopropylphenyl)acetic acid (2.82 g, 98%). 1H NMR (CDCl3, 400 MHz) □ 7.16 (d, J=8.2, 2H), 7.03 (d, 2H), 3.60 (s, 2H), 1.92-1.83 (m, 1H), 098-0.91 (m, 2H), 0.70-0.64 (m, 2H).

1. concentrationconcentrated in vacuo
2. dissolutionThe solids were re-dissolved in ethyl acetate
3. customThe layers were then separated
4. washThe aqueous layer was washed with ethyl acetate (2×)
5. washThe combined organic layers were then washed with saturated NaCl
6. dry with materialdried over Na2SO4
7. concentrationconcentrated

ORD record

ord-cc72b6afeda34dc4bf6bd6be08c7e4bd

Source dataset

uspto-grants-2015_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US09150549B2