1-(5-氨基-2-氟-4-羟基苯基)乙酮

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone (13.2 g, 78 mmol), NaHCO3 (19.67 g, 234 mmol) in water (90 mL), and 4-methyl-2-pentanone (90 mL) at 0° C. was added 2-chloroacetyl chloride (13.22 g, 8.8 mL, 117 mmol) dropwise. After addition, the reaction mixture was stirred at ambient temperature for 0.5 h and then at 80° C. for 18 h. The mixture was cooled to ambient temperature and filtered to give 6-acetyl-7-fluoro-4H-benzo[1,4]oxazin-3-one as gray solid (12 g, 74%), which was used in next step directly without further purification. 1H NMR (DMSO-d6, 400 MHz): δ 10.90 (s 1H), 7.35 (d, J=7.6 Hz, 1H), 7.02 (d, J=11.6 Hz, 1H), 4.71 (s, 2H), 2.47 (d, J=4.8 Hz, 3H). After addition at 80° C. for 18 h The mixture was cooled to ambient temperature filtered

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone (13.2 g, 78 mmol), NaHCO3 (19.67 g, 234 mmol) in water (90 mL), and 4-methyl-2-pentanone (90 mL) at 0° C. was added 2-chloroacetyl chloride (13.22 g, 8.8 mL, 117 mmol) dropwise. After addition, the reaction mixture was stirred at ambient temperature for 0.5 h and then at 80° C. for 18 h. The mixture was cooled to ambient temperature and filtered to give 6-acetyl-7-fluoro-4H-benzo[1,4]oxazin-3-one as gray solid (12 g, 74%), which was used in next step directly without further purification. 1H NMR (DMSO-d6, 400 MHz): δ 10.90 (s 1H), 7.35 (d, J=7.6 Hz, 1H), 7.02 (d, J=11.6 Hz, 1H), 4.71 (s, 2H), 2.47 (d, J=4.8 Hz, 3H). After addition at 80° C. for 18 h The mixture was cooled to ambient temperature filtered

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 1-(2-fluoro-4-hydroxy-5-nitro-phenyl)-ethanone (3 g, 15.7 mmol) in EtOH (30 mL) and THF (6 mL) was added 10% Pd/C (1.5 g, 1.4 mmol) and the reaction mixture was stirred at ambient temperature under an atmosphere of H2 for 2 h. The reaction mixture was filtered and the filtrate was evaporated in vacuo to give 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone as black solid (2.5 g, 94%), which was used in the next step directly without further purification. 1H NMR (DMSO-d6, 400 MHz): δ 7.01 (d, J=8.0 Hz, 1H), 6.48 (d, J=12.4 Hz, 1H), 2.39 (d, J=4.8 Hz, 3H). The reaction mixture was filtered the filtrate was evaporated in vacuo

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 1-(2-fluoro-4-hydroxy-5-nitro-phenyl)-ethanone (3 g, 15.7 mmol) in EtOH (30 mL) and THF (6 mL) was added Pd/C (10%, 1.5 g, 1.4 mmol) and the reaction mixture was stirred at ambient temperature for 2 h. The reaction mixture was filtered and the filtrate was evaporated in vacuo to give 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone as a black solid (2.5 g, crude), which was used in the next step directly without further purification. 1H-NMR (DMSO-d6, 400 MHz): δ 7.01 (d, J=8.0 Hz, 1H), 6.48 (d, J=12.4 Hz, 1H), 2.39 (d, J=4.8 Hz, 3H). The reaction mixture was filtered the filtrate was evaporated in vacuo

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a mixture of 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone (13.2 g, 78 mmol), NaHCO3 (19.67 g, 234 mmol) in water (90 mL), and 4-methyl-2-pentanone (90 mL) at 0° C. was added 2-chloroacetyl chloride (13.22 g, 8.8 mL, 117 mmol) dropwise. After addition, the reaction mixture was stirred at ambient temperature for 0.5 h and then at 80° C. for 18 h. The mixture was cooled to ambient temperature and filtered to give 6-acetyl-7-fluoro-4H-benzo[1,4]oxazin-3-one as gray solid (12 g, 74%), which was used in next step directly without further purification. 1H NMR (DMSO-d6, 400 MHz): δ 10.90 (s 1H), 7.35 (d, J=7.6 Hz, 1H), 7.02 (d, J=11.6 Hz, 1H), 4.71 (s, 2H), 2.47 (d, J=4.8 Hz, 3H). After addition at 80° C. for 18 h The mixture was cooled to ambient temperature filtered

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 1-(2-fluoro-4-hydroxy-5-nitro-phenyl)-ethanone (3 g, 15.7 mmol) in EtOH (30 mL) and THF (6 mL) was added 10% Pd/C (1.5 g, 1.4 mmol) and the reaction mixture was stirred at ambient temperature under an atmosphere of H2 for 2 h. The reaction mixture was filtered and the filtrate was evaporated in vacuo to give 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone as black solid (2.5 g, 94%), which was used in the next step directly without further purification. 1H NMR (DMSO-d6, 400 MHz): δ 7.01 (d, J=8.0 Hz, 1H), 6.48 (d, J=12.4 Hz, 1H), 2.39 (d, J=4.8 Hz, 3H). The reaction mixture was filtered the filtrate was evaporated in vacuo

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a solution of 1-(2-fluoro-4-hydroxy-5-nitro-phenyl)-ethanone (3 g, 15.7 mmol) in EtOH (30 mL) and THF (6 mL) was added Pd/C (10%, 1.5 g, 1.4 mmol) and the reaction mixture was stirred at ambient temperature for 2 h. The reaction mixture was filtered and the filtrate was evaporated in vacuo to give 1-(5-amino-2-fluoro-4-hydroxy-phenyl)-ethanone as a black solid (2.5 g, crude), which was used in the next step directly without further purification. 1H-NMR (DMSO-d6, 400 MHz): δ 7.01 (d, J=8.0 Hz, 1H), 6.48 (d, J=12.4 Hz, 1H), 2.39 (d, J=4.8 Hz, 3H). The reaction mixture was filtered the filtrate was evaporated in vacuo