5-bromo-2-fluoro-4-methylaniline

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Combine crude 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (32.4 g, 138 mmol), ethanol (100 mL) and Raney Nickel (1.00 g, 17.04 mmol) in a shaker flask. Charge the flask with hydrogen (275 kPa) and agitate until the absorption of hydrogen ceases. De-pressurize the reaction vessel, remove the catalyst by filtration, and evaporate the filtrate to dryness. Add MTBE, then filter again and evaporate the filtrate. Stir residue in hexanes. Collect the solids by filtration, wash with cold hexanes and dry in vacuo to provide the title compound (17.8 g, 63%) as a dark solid. MS (m/z): 204.0 (M+H+)/206.0 (M+H+). De-pressurize the reaction vessel, remove the catalyst by filtration evaporate the filtrate to dryness Add MTBE, then filter again evaporate the filtrate Collect the solids by filtration wash with cold hexanes dry in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1H NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1H), 6.86 (d, J=11.6 Hz, 1H), 3.64 (br, 2H), 2.26 (s, 3H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Combine crude 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (32.4 g, 138 mmol), ethanol (100 mL) and Raney Nickel (1.00 g, 17.04 mmol) in a shaker flask. Charge the flask with hydrogen (275 kPa) and agitate until the absorption of hydrogen ceases. De-pressurize the reaction vessel, remove the catalyst by filtration, and evaporate the filtrate to dryness. Add MTBE, then filter again and evaporate the filtrate. Stir residue in hexanes. Collect the solids by filtration, wash with cold hexanes and dry in vacuo to provide the title compound (17.8 g, 63% yield) as a dark solid. MS (m/z): 204.0 (M+1)/206.0 (M+3). De-pressurize the reaction vessel, remove the catalyst by filtration evaporate the filtrate to dryness Add MTBE, then filter again evaporate the filtrate Collect the solids by filtration wash with cold hexanes dry in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1H), 6.86 (d, J=11.6 Hz, 1H), 3.64 (br, 2H), 2.26 (s, 3H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1H), 6.86 (d, J=11.6 Hz, 1H), 3.64 (br, 2H), 2.26 (s, 3H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1H NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1H), 6.86 (d, J=11.6 Hz, 1H), 3.64 (br, 2H), 2.26 (s, 3H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (20 g, 85.8 mmol) in methanol (300 mL) was added Raney Ni (20%/w, ˜2.0 g, suspension in water, washed with acetone for several times), then the resulting mixture was hydrogenated under hydrogen atmosphere for 2 h. The catalyst was filtered, concentrated, and tire residue was recrystallized (petroleum ether) to afford 5-bromo-2-fluoro-4-methylphenylamine (10 g, 57.5% yield). 1HNMR (400 MHz, DMSO-d6): δ 7.12 (d, J=10.2 Hz, 1 H), 6.78 (d, J=10.9 Hz, 1 H), 4.85 (s, 2 H), 2.29 (s, 3 H), 1.26 (s, 12 H). The catalyst was filtered concentrated tire residue was recrystallized (petroleum ether)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1H NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1H), 6.86 (d, J=11.6 Hz, 1H), 3.64 (br, 2H), 2.26 (s, 3H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1H NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1 H), 6.86 (d, J=11.6 Hz, 1 H), 3.64 (br, 2 H), 2.26 (s, 3 H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Combine crude 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (32.4 g, 138 mmol), ethanol (100 mL) and Raney Nickel (1.00 g, 17.04 mmol) in a shaker flask. Charge the flask with hydrogen (275 kPa) and agitate until the absorption of hydrogen ceases. De-pressurize the reaction vessel, remove the catalyst by filtration, and evaporate the filtrate to dryness. Add MTBE, then filter again and evaporate the filtrate. Stir residue in hexanes. Collect the solids by filtration, wash with cold hexanes and dry in vacuo to provide the title compound (17.8 g, 63%) as a dark solid. MS (m/z): 204.0 (M+H+)/206.0 (M+H+). De-pressurize the reaction vessel, remove the catalyst by filtration evaporate the filtrate to dryness Add MTBE, then filter again evaporate the filtrate Collect the solids by filtration wash with cold hexanes dry in vacuo

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 1-bromo-4-fluoro-2-methyl-5-nitrobenzene (18.0 g) in ethanol (300 mL) was added SnCl2.2H2O (51.8 g, 0.230 mol) at room temperature. The mixture was heated at reflux for 3 h. The solvent was evaporated under reduced pressure to give a residue, which was poured into ice water. The aqueous phase was basified with sat. NaHCO3 to pH 7. The solid was filtered off and the filtrate was extracted with dichloromethane (200 mL×3). The combined organics were dried over anhydrous Na2SO4 and evaporated under reduced pressure. The residue was purified by column chromatography (petroleum ether/EtOAc=10/1) to afford 5-bromo-2-fluoro-4-methylaniline (5.0 g, 30% yield for two steps). 1H NMR (400 MHz, CDCl3) δ 6.96 (d, J=8.8 Hz, 1H), 6.86 (d, J=11.6 Hz, 1H), 3.64 (br, 2H), 2.26 (s, 3H). MS (ESI) m/z (M+H+) 204.0. The mixture was heated at reflux for 3 h The solvent was evaporated under reduced pressure to give a residue, which The solid was filtered off the filtrate was extracted with dichloromethane (200 mL×3) The combined organics were dried over anhydrous Na2SO4 evaporated under reduced pressure The residue was purified by column chromatography (petroleum ether/EtOAc=10/1)