反应详情

Add a solution of hydroxyamine (50% in water, 0.50 mL, 16.3 mmol) in water and NaOH (197 mg, 4.92 mmol) to a solution of methyl 3-(3-bromophenyl)propiolate (980 mg, 4.10 mmol) in a mixture of MeOH and THF (6.0 mL/12.0 mL). Remove the solvents after 2 d. Dissolve the residue in water. Adjust the pH of the aqueous phase to 2 and extract with EtOAc. Dry, filter and concentrate. Purify the residue by flash chromatography eluting with a mixture of EtOAc and hexanes (50:50) to afford the title compound (856 mg, 87%): 1H NMR (d6-DMSO) δ 11.54 (s, 1H), 8.08 (dd, 1H, J=2.0, 1.6 Hz), 7.87 (ddd, 1H, J=8.6, 1.6, 0.8 Hz), 7.75 (ddd, 1H, J=8.2, 2.0, 0.8 Hz), 7.54 (t, 1H, J=7.8 Hz), 6.75 (s, 1H).

1. customRemove the solvents after 2 d
2. dissolutionDissolve the residue in water
3. extractionextract with EtOAc
4. customDry
5. filtrationfilter
6. concentrationconcentrate
7. customPurify the residue by flash chromatography
8. washeluting with a mixture of EtOAc and hexanes (50:50)