反应详情

To a solution of Ethyl (3-oxo-2,3,-dihydropyridazin-6-yl)-propionate (3.00 mmol, 589 mg) in THF was added LiOH (2M, aqueous) (7.50 mL). The solution was stirred at rt. for 15 minutes, additional water (25 mL) was added and the THF removed in vacuo. The pH of the aqueous phase was adjusted to 3.0 by addition of HCl (2M, aqueous) and the solid material filtered off and washed with water (2×3 mL). The solid was dried in vacuo to yield the desired product (461 mg, 91.4%) as a colorless powder. 1H NMR (CDCl3): δ 11.62 (s br, 1H, NH), 7.18 (d, J=9.7 Hz, 1H, arom.), 7.88 (d, J=9.7 Hz, 1H, arom.), 4.11 (q, J=7.1 Hz, 2H, CH2), 2.90 (t, J=7.0 Hz, 2H, CH2), 2.64 (t, J=7.0 Hz, 2H, CH2), 1.25 (t, J=7.1 Hz, 3H, CH3). FAB+ MS: 169.0611 (M+H+, calc. for C9H12N2O3+H+ 169.0613).

1. customthe THF removed in vacuo
2. additionThe pH of the aqueous phase was adjusted to 3.0 by addition of HCl (2M, aqueous)
3. filtrationthe solid material filtered off
4. washwashed with water (2×3 mL)
5. customThe solid was dried in vacuo