4-bromo-3-fluoro-2-methylaniline

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

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

Procedure: To a solution of 4-bromo-3-fluoro-2-methylaniline (20 g, 98.0 mmol) in CH3CO2H (600 mL) was added NaNO2 (8.1 g, 118 mmol) at 10° C. The resulting mixture was stirred at room temperature for 4 hours. Upon completion, aqueous NaOH (50%) was added to the reaction mixture until pH was ˜7-8. The mixture was extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (0˜40% EtOAc in petroleum ether) affording the title compound (16 g). 1H NMR (300 MHz, DMSO-d6): δ 13.58 (br, 1H), 8.22 (s, 1H), 7.53 (t, 1H), 7.38 (d, 1H). The mixture was extracted with EtOAc The organic layer was dried over Na2SO4 concentrated in vacuo The residue was purified by column chromatography on silica gel (0˜40% EtOAc in petroleum ether)

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

Procedure: To a solution of 4-bromo-3-fluoro-2-methylaniline (20 g, 98.0 mmol) in CH3CO2H (600 mL) was added NaNO2 (8.1 g, 118 mmol) at 10° C. The resulting mixture was stirred at room temperature for 4 hours. Upon completion, aqueous NaOH (50%) was added to the reaction mixture until pH was ˜7-8. The mixture was extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (0˜40% EtOAc in petroleum ether) affording the title compound (16 g). 1H NMR (300 MHz, DMSO-d6): δ 13.58 (br, 1H), 8.22 (s, 1H), 7.53 (t, 1H), 7.38 (d, 1H). The mixture was extracted with EtOAc The organic layer was dried over Na2SO4 concentrated in vacuo The residue was purified by column chromatography on silica gel (0˜40% EtOAc in petroleum ether)

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

Procedure: To a solution of 3-fluoro-2-methylaniline (20 g, 0.16 mol) in CH3CN (500 mL) was added NBS (31.3 g, 0.176 mol) in portions at 10° C. The resulting mixture was stirred at room temperature for 30 minutes. Upon completion, saturated Na2S2O3 (500 mL) was added slowly into the reaction mixture at 10° C. The organic layer was separated, and the aqueous layer was extracted with EtOAc. The combined organic layers were dried over Na2SO4 and concentrated in vacuo. The residue was washed with petroleum ether affording the title compound (20 g), which was used in the next step without further purification. 1H NMR (300 MHz, DMSO-d6): δ 7.08 (t, 1H), 6.40 (dd, 1H), 5.35 (br, 2H), 1.98 (d, 3H). The organic layer was separated the aqueous layer was extracted with EtOAc The combined organic layers were dried over Na2SO4 concentrated in vacuo The residue was washed with petroleum ether affording the title compound (20 g), which was used in the next step without further purification

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-bromo-3-fluoro-2-methylaniline (23 g, 113 mmol) and cyanocopper (20.19 g, 225 mmol) N,N-dimethylformamide (200 mL) was heated to 140° C. for 7 h. After the mixture was cooled to room temperature filtered and poured into a reparatory funnel containing water and ethyl acetate (1:1). Layers were separated and the organic layer was concentrated under reduced pressure. Flash chromatography (0-50% ethyl acetate in hexane) gave the desired product (11.4 g, 76 mmol, 67% yield) as a brown solid. 1H NMR (400 MHz, CHLOROFORM-d) δ (ppm) 7.22 (t, 1H), 6.45 (d, J=8.59 Hz, 1H), 4.23 (br. s., 2H), 2.07 (s, 3H); MS (ESI) m/z 151.1 [M+1]+. After the mixture was cooled to room temperature filtered poured into a reparatory funnel containing water and ethyl acetate (1:1) Layers were separated the organic layer was concentrated under reduced pressure

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-bromo-3-fluoro-2-methylaniline (23 g, 113 mmol) and cyanocopper (20.19 g, 225 mmol) N,N-dimethylformamide (200 mL) was heated to 140° C. for 7 h. After the mixture was cooled to room temperature filtered and poured into a reparatory funnel containing water and ethyl acetate (1:1). Layers were separated and the organic layer was concentrated under reduced pressure. Flash chromatography (0-50% ethyl acetate in hexane) gave the desired product (11.4 g, 76 mmol, 67% yield) as a brown solid. 1H NMR (400 MHz, CHLOROFORM-d) δ (ppm) 7.22 (t, 1H), 6.45 (d, J=8.59 Hz, 1H), 4.23 (br. s., 2H), 2.07 (s, 3H); MS (ESI) m/z 151.1 [M+1]+. After the mixture was cooled to room temperature filtered poured into a reparatory funnel containing water and ethyl acetate (1:1) Layers were separated the organic layer was concentrated under reduced pressure

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 3-fluoro-2-methylaniline (25 g, 200 mmol) in acetic acid (140 mL) at 0-5° C. was added hydrogen bromide (100 mL, 200 mmol) then dimethyl sulfoxide (72 mL) was added slowly dropwise (reaction is exothermic and at temperature higher than 5-15° C. produces dibromoisomer). The mixture was stirred at 5-15° C. for 12 h (mixture became clear solution). The resulting solution was cooled to 0° C. and neutralized with sodium hydroxide then with sodium bicarbonate to pH 7. The mixture was extracted with ethyl acetate. The organic layer was concentrated under reduced pressure. Flash chromatography (0-10% ethyl acetate in hexane) gave the desired product as a white solid (23.3 g, 114 mmol, 57% yield). 1H NMR (400 MHz, CHLOROFORM-d) δ (ppm) 7.11 (t, J=8.20 Hz, 1H), 6.35 (d, J=8.98 Hz, 1H), 3.72 (br. s., 2H), 2.07 (d, J=1.95 Hz, 3H). (reaction is exothermic and at temperature higher than 5-15° C. produces dibromoisomer) The mixture was extracted with ethyl acetate The organic layer was concentrated under reduced pressure

Conditions: temp:140.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-bromo-3-fluoro-2-methylaniline (23 g, 113 mmol) and cyanocopper (20.19 g, 225 mmol) N,N-dimethylformamide (200 mL) was heated to 140° C. for 7 h. After the mixture was cooled to room temperature filtered and poured into a separatory funnel containing water and ethyl acetate (1:1). Layers were separated and the organic layer was concentrated under reduced pressure. Flash chromatography (0-50% ethyl acetate in hexane) gave the desired product (11.4 g, 76 mmol, 67% yield) as a brown solid. 1H NMR (400 MHz, CHLOROFORM-d) δ (ppm) 7.22 (t, 1H), 6.45 (d, J=8.59 Hz, 1H), 4.23 (br. s., 2H), 2.07 (s, 3H); MS (ESI) m/z 151.1[M+1]+. After the mixture was cooled to room temperature filtered poured into a separatory funnel containing water and ethyl acetate (1:1) Layers were separated the organic layer was concentrated under reduced pressure

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 3-fluoro-2-methylaniline (25 g, 200 mmol) in acetic acid (140 mL) at 0-5° C. was added hydrogen bromide (100 mL, 200 mmol) then dimethyl sulfoxide (72 mL) was added slowly dropwise (reaction is exothermic and at temperature higher than 5-15° C. produces dibromoisomer). The mixture was stirred at 5-15° C. for 12 h (mixture became clear solution). The resulting solution was cooled to 0° C. and neutralized with sodium hydroxide then with sodium bicarbonate to pH 7. The mixture was extracted with ethyl acetate. The organic layer was concentrated under reduced pressure. Flash chromatography (0-10% ethyl acetate in hexane) gave the desired product as a white solid (23.3 g, 114 mmol, 57% yield). 1H NMR (400 MHz, CHLOROFORM-d) δ (ppm) 7.11 (t, J=8.20 Hz, 1H), 6.35 (d, J=8.98 Hz, 1H), 3.72 (br. s., 2H), 2.07 (d, J=1.95 Hz, 3H). (reaction is exothermic and at temperature higher than 5-15° C. produces dibromoisomer) The mixture was extracted with ethyl acetate The organic layer was concentrated under reduced pressure

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a stirred solution of 3-fluoro-2-methylaniline (25 g, 200 mmol) in acetic acid (140 mL) at 0-5° C. was added hydrogen bromide (100 mL, 200 mmol) then dimethyl sulfoxide (72 mL) was added slowly dropwise (reaction is exothermic and at temperature higher than 5-15° C. produces dibromoisomer). The mixture was stirred at 5-15° C. for 12 h (mixture became clear solution). The resulting solution was cooled to 0° C. and neutralized with sodium hydroxide then with sodium bicarbonate to pH 7. The mixture was extracted with ethyl acetate. The organic layer was concentrated under reduced pressure. Flash chromatography (0-10% ethyl acetate in hexane) gave the desired product as a white solid (23.3 g, 114 mmol, 57% yield). 1H NMR (400 MHz, CHLOROFORM-d) δ (ppm) 7.11 (t, J=8.20 Hz, 1H), 6.35 (d, J=8.98 Hz, 1H), 3.72 (br. s., 2H), 2.07 (d, J=1.95 Hz, 3H). (reaction is exothermic and at temperature higher than 5-15° C. produces dibromoisomer) The mixture was extracted with ethyl acetate The organic layer was concentrated under reduced pressure

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

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

Procedure: To a solution of 4-bromo-3-fluoro-2-methylaniline (20 g, 98.0 mmol) in CH3CO2H (600 mL) was added NaNO2 (8.1 g, 118 mmol) at 10° C. The resulting mixture was stirred at room temperature for 4 hours. Upon completion, aqueous NaOH (50%) was added to the reaction mixture until pH was ˜7-8. The mixture was extracted with EtOAc. The organic layer was dried over Na2SO4 and concentrated in vacuo. The residue was purified by column chromatography on silica gel (0˜40% EtOAc in petroleum ether) affording the title compound (16 g). 1H NMR (300 MHz, DMSO-d6): δ 13.58 (br, 1H), 8.22 (s, 1H), 7.53 (t, 1H), 7.38 (d, 1H). The mixture was extracted with EtOAc The organic layer was dried over Na2SO4 concentrated in vacuo The residue was purified by column chromatography on silica gel (0˜40% EtOAc in petroleum ether)