反应详情

温度

100 °C

A mixture of 4-hydroxy-3-methoxybenzoic acid (8.4 g), 3-(pyrrolidin-1-yl)propyl chloride (J. Amer. Chem. Soc., 1955, 77, 2272; 14.75 g), potassium carbonate (13.8 g), potassium iodide (1.66 g) and DMF (150 ml) was stirred and heated to 100° C. for 3 hours. The mixture was allowed to cool to ambient temperature, filtered and the filtrate was evaporated. The residue was dissolved in ethanol (75 ml), 2N aqueous sodium hydroxide solution (75 ml) was added and the mixture was heated to 90° C. for 2 hours. The mixture was concentrated by evaporation and acidified by the addition of concentrated aqueous hydrochloric acid. The resultant mixture was washed with diethyl ether and then purified by column chromatography using a Diaion (trade mark of Mitsubishi) HP20SS resin column, eluting with water and then with a gradient of methanol (0 to 25%) in dilute hydrochloric acid (pH2.2). The methanol was removed by evaporation and the aqueous residue was freeze dried to give 3-methoxy-4-(3-pyrrolidin-1-ylpropoxy)benzoic acid hydrochloride (12.2 g); NMR Spectrum: (DMSOd6 and CF3CO2D) 2.2 (m, 2H), 3.15 (t, 2H), 3.3 (t, 2H), 3.5 (d, 2H), 3.7 (t, 2H), 3.82 (s, 3H), 4.05 (d, 2H), 4.15 (t, 2H), 7.07 (d, 1H), 7.48 (s, 1H), 7.59 (d, 1H).

1. temperatureto cool to ambient temperature
2. filtrationfiltered
3. customthe filtrate was evaporated
4. dissolutionThe residue was dissolved in ethanol (75 ml)
5. addition2N aqueous sodium hydroxide solution (75 ml) was added
6. temperaturethe mixture was heated to 90° C. for 2 hours
7. concentrationThe mixture was concentrated by evaporation
8. additionacidified by the addition of concentrated aqueous hydrochloric acid
9. washThe resultant mixture was washed with diethyl ether
10. custompurified by column chromatography
11. washeluting with water
12. customThe methanol was removed by evaporation
13. customdried