反应详情

温度

70 °C

To a solution of methyl 4-(3-hydroxypropoxy)-3-methyl-benzoate (0.9 g, 4.01 mmol) in dioxane (8 mL) was added 1N NaOH (5 mL) and the reaction mixture was heated at 70° C. for 22 hours. The solvent was concentrated in vacuo and the crude residue was dissolved in water (20 mL) and extracted with ethyl acetate (1×20 mL). The aqueous layer was acidified with 1 M HCl solution and extracted with ethyl acetate (2×20 mL). The organics were separated, dried with Na2SO4 and concentrated in vacuo to give 4-(3-hydroxypropoxy)-3-methyl-benzoic acid (0.7 g, 87%) as a white solid. ESI-MS m/z calc. 210.0. Found 211.0 (M+1)+; Retention time: 0.95 minutes (3 min run); 1H NMR (400 MHz, DMSO) δ 12.5 (bs, 1H), 7.97-7.60 (m, 2H), 7.01 (d, J=8.6 Hz, 1H), 4.57 (s, 1H), 4.11 (t, J=6.2 Hz, 2H), 3.59 (t, J=5.5 Hz, 2H), 2.19 (s, 3H), 1.89 (p, J=6.2 Hz, 2H).

1. concentrationThe solvent was concentrated in vacuo
2. dissolutionthe crude residue was dissolved in water (20 mL)
3. extractionextracted with ethyl acetate (1×20 mL)
4. extractionextracted with ethyl acetate (2×20 mL)
5. customThe organics were separated
6. dry with materialdried with Na2SO4
7. concentrationconcentrated in vacuo