反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.
实验步骤: To a solution of 3-(3-amino-2-cyanophenoxy)-2,2-dimethyl-N-propylpropan-amide (Tachdjian, C. et al. PCT Int. Appl. 2008, WO 2008154221, 1.38 g, 5.0 mmol) and ethyl acetoacetate (0.66 g, 5.0 mmol) in dry toluene (150 mL) was added SnCl4 (2.61 g, 10.0 mmol) dropwise via syringe at room temperature under nitrogen. After 1 hr at room temperature, the reaction mixture was refluxed for an additional 5 hrs. The solution was cooled to room temperature and the solvent removed under reduced pressure. The residue was diluted with EtOAc, and aqueous NaOH (2N) was added at room temperature to pH>8. The solution was filtered and the organic layer separated. The aqueous layer was extracted with EtOAc (5×). The combined organic layers was washed with brine, and dried over Na2SO4. After evaporation of the solvent, the residue was purified by chromatography on silica gel (0.5% MeOH in EtOAc) to give the title compound as an off-white solid (1.63 g, 84%). 1H NMR (400 MHz, DMSO-d6) δ 0.73 (t, J=7.6 Hz, 3H), 1.25 (s, 6H), 1.32 (t, J=7.4 Hz, 3H), 1.35-1.42 (m, 2H), 2.54 (s, 3H), 3.00-3.05 (m, 2H), 4.12 (s, 2H), 4.31 (q, J=7.4 Hz, 2H), 6.87 (d, J=8.0 Hz, 1H), 7.23 (d, J=8.0 Hz, 1H), 7.50 (t, J=8.0 Hz, 1H), 7.80 (t, J=5.6 Hz, 1H), 8.08 (s, 2H). MS 388 (MH+).
the reaction mixture was refluxed for an additional 5 hrs
the solvent removed under reduced pressure
The residue was diluted with EtOAc, and aqueous NaOH (2N)
was added at room temperature to pH>8
The solution was filtered
the organic layer separated
The aqueous layer was extracted with EtOAc (5×)
The combined organic layers was washed with brine
dried over Na2SO4
After evaporation of the solvent
the residue was purified by chromatography on silica gel (0.5% MeOH in EtOAc)
来源 ID: ord-db260634dece4c7786b17cd3b78f6713