反应详情

温度

85 °C

To a solution of 3-[2-(2-methoxyethoxy)ethoxy]benzaldehyde (9.18 g, 40.9 mmol) in pyridine (70 mL) under nitrogen was added malonic acid (8.69 g, 81.9 mmol) followed by piperidine (4.13 mL, 40.9 mmol). The reaction solution was stirred for 3 h at 85° C. and left stirring over night at room temperature. The reaction solution was concentrated to an oil and left on high vacuum over night to remove the remaining pyridine. To the oil was added ice (120 g) and under vigorous stirring, concentrated hydrochloric acid (13 mL) was added. The mixture was extracted with methylene chloride (3×65 mL) and the combined organic layer was washed with water (60 mL) and brine (60 mL), dried over sodium sulphate, filtered and concentrated in vacuo. The resulting oil was dried in high vacuum to give 10.8 g (99% yield) of the title compound. 1HNMR (300 MHz, DMSO-d6) δ 12.28 (br s, 1H), 7.56 (d, J=16 Hz, 1H), 7.28 (m, 3H), 6.99 (dd, J=8 Hz, J=2 Hz, 1H), 6.56 (d, J=16 Hz, 1H), 4.14 (t, J=5 Hz, 2H), 3.75 (t, J=5 Hz, 2H), 3.60 (t, J=5 Hz, 2H), 3.36 (t, J=5 Hz, 2H), 3.25 (s, 3H).

1. waitleft
2. stirringstirring over night at room temperature
3. concentrationThe reaction solution was concentrated to an oil
4. waitleft on high vacuum over night
5. customto remove the remaining pyridine
6. additionTo the oil was added ice (120 g)
7. additionunder vigorous stirring, concentrated hydrochloric acid (13 mL) was added
8. extractionThe mixture was extracted with methylene chloride (3×65 mL)
9. washthe combined organic layer was washed with water (60 mL) and brine (60 mL)
10. dry with materialdried over sodium sulphate
11. filtrationfiltered
12. concentrationconcentrated in vacuo
13. customThe resulting oil was dried in high vacuum