反应详情

温度

0 °C

A solution of diethyl malonate (3.03 g, 18.77 mmol) and anhydrous magnesium chloride in acetonitrile (36 mL) at 0° C. was treated with triethylamine (5.2 mL, 37.55 mmol), stirred at 0° C. for 30 min, stirred at 25° C. for 3 hours, cooled to 0° C. and treated dropwise with a solution of the product of Example 1D (18.77 mmol) in acetonitrile (15 mL) over 10 min and stirred at 50° C. for 18 hours. The solution was cooled to 25° C. and concentrated in vacuo. The solids were suspended in ethyl acetate and cooled to 0° C., treated with 4N HCl solution until all solids had dissolved. The organic layer was extracted with water (2×) and with saturated sodium chloride solution, dried (Na2SO4), filtered and concentrated in vacuo to afford the title compound (4.51 g, 66%). 1H NMR (300 MHz, CDCl3): δ 7.32 (m, 5 H), 4.50 (s, 1 H), 4.04 (q, J=7.35 Hz, 4 H), 1.97 (m, 4 H), 1.28 (m, 3 H), 0.98 (m, 10 H).

1. stirringstirred at 25° C. for 3 hours
2. temperaturecooled to 0° C.
3. stirringstirred at 50° C. for 18 hours
4. temperatureThe solution was cooled to 25° C.
5. concentrationconcentrated in vacuo
6. temperaturecooled to 0° C.
7. additiontreated with 4N HCl solution until all solids
8. dissolutionhad dissolved
9. extractionThe organic layer was extracted with water (2×) and with saturated sodium chloride solution
10. dry with materialdried (Na2SO4)
11. filtrationfiltered
12. concentrationconcentrated in vacuo