(3-bromo-4-fluorophenyl)hydrazine;hydrochloride

Conditions: temp:180.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4,4-Diethoxybutan-1-amine (4.72 g, 29.3 mmol) was added to (3-bromo-4-fluorophenyl)hydrazine hydrochloride (6.4 g, 27 mmol). The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C. The mixture was stirred at 180° C. for 2.5 h and then cooled to 120° C. Methanol (300 mL) was added, and the mixture was stirred at ambient temperature for 18 h. The resulting suspension was filtered through a silica gel plug, and the silica gel was then washed with methanol (5×300 mL). The combined methanol fractions were concentrated under vacuum to provide the crude title compound (8.1 g) as a yellow solid, which was used in the next step without further purification: ESI MS m/z 257 [M+H]+. The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C cooled to 120° C the mixture was stirred at ambient temperature for 18 h The resulting suspension was filtered through a silica gel plug the silica gel was then washed with methanol (5×300 mL) The combined methanol fractions were concentrated under vacuum

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

Procedure: A solution of sodium nitrite (4.2 g, 60 mmol) was added drop-wise to a mixture of 3-bromo-4-fluoroaniline (11.2 g, 58.9 mmol) and concentrated HCl (30 mL, 0.36 M) at 0° C. over 30 min. The resulting clear solution was stirred for 45 min, and a solution of SnCl2.2H2O (27 g, 120 mmol) in concentrated HCl (30 mL) was added drop-wise at 0° C. over 1.5 h. The mixture was stirred for 18 h at room temperature. The resulting precipitate was collected by filtration and crystallized from ethanol to provide the title compound (6.2 g, 42%) as a yellow powder: 1H NMR (300 MHz, DMSO-d6) δ 10.24 (s, 3H), 8.42 (s, 1H), 7.36-7.30 (m, 2H), 7.03-6.98 (m, 1H). The mixture was stirred for 18 h at room temperature The resulting precipitate was collected by filtration crystallized from ethanol

Conditions: temp:180.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4,4-Diethoxybutan-1-amine (4.72 g, 29.3 mmol) was added to (3-bromo-4-fluorophenyl)hydrazine hydrochloride (6.4 g, 27 mmol). The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C. The mixture was stirred at 180° C. for 2.5 h and then cooled to 120° C. Methanol (300 mL) was added, and the mixture was stirred at ambient temperature for 18 h. The resulting suspension was filtered through a silica gel plug, and the silica gel was then washed with methanol (5×300 mL). The combined methanol fractions were concentrated under vacuum to provide the crude title compound (8.1 g) as a yellow solid, which was used in the next step without further purification: ESI MS m/z 257 [M+H]+. The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C cooled to 120° C the mixture was stirred at ambient temperature for 18 h The resulting suspension was filtered through a silica gel plug the silica gel was then washed with methanol (5×300 mL) The combined methanol fractions were concentrated under vacuum

Conditions: temp:180.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4,4-Diethoxybutan-1-amine (4.72 g, 29.3 mmol) was added to (3-bromo-4-fluorophenyl)hydrazine hydrochloride (6.4 g, 27 mmol). The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C. The mixture was stirred at 180° C. for 2.5 h and then cooled to 120° C. Methanol (300 mL) was added, and the mixture was stirred at ambient temperature for 18 h. The resulting suspension was filtered through a silica gel plug, and the silica gel was then washed with methanol (5×300 mL). The combined methanol fractions were concentrated under vacuum to provide the crude title compound (8.1 g) as a yellow solid, which was used in the next step without further purification: ESI MS m/z 257 [M+H]+. The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C cooled to 120° C the mixture was stirred at ambient temperature for 18 h The resulting suspension was filtered through a silica gel plug the silica gel was then washed with methanol (5×300 mL) The combined methanol fractions were concentrated under vacuum

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

Procedure: A solution of sodium nitrite (4.2 g, 60 mmol) was added drop-wise to a mixture of 3-bromo-4-fluoroaniline (11.2 g, 58.9 mmol) and concentrated HCl (30 mL, 0.36 M) at 0° C. over 30 min. The resulting clear solution was stirred for 45 min, and a solution of SnCl2.2H2O (27 g, 120 mmol) in concentrated HCl (30 mL) was added drop-wise at 0° C. over 1.5 h. The mixture was stirred for 18 h at room temperature. The resulting precipitate was collected by filtration and crystallized from ethanol to provide the title compound (6.2 g, 42%) as a yellow powder: 1H NMR (300 MHz, DMSO-d6) δ 10.24 (s, 3H), 8.42 (s, 1H), 7.36-7.30 (m, 2H), 7.03-6.98 (m, 1H). The mixture was stirred for 18 h at room temperature The resulting precipitate was collected by filtration crystallized from ethanol

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

Procedure: A solution of sodium nitrite (4.2 g, 60 mmol) was added drop-wise to a mixture of 3-bromo-4-fluoroaniline (11.2 g, 58.9 mmol) and concentrated HCl (30 mL, 0.36 M) at 0° C. over 30 min. The resulting clear solution was stirred for 45 min, and a solution of SnCl2.2H2O (27 g, 120 mmol) in concentrated HCl (30 mL) was added drop-wise at 0° C. over 1.5 h. The mixture was stirred for 18 h at room temperature. The resulting precipitate was collected by filtration and crystallized from ethanol to provide the title compound (6.2 g, 42%) as a yellow powder: 1H NMR (300 MHz, DMSO-d6) δ 10.24 (s, 3H), 8.42 (s, 1H), 7.36-7.30 (m, 2H), 7.03-6.98 (m, 1H). The mixture was stirred for 18 h at room temperature The resulting precipitate was collected by filtration crystallized from ethanol

Conditions: temp:180.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4,4-Diethoxybutan-1-amine (4.72 g, 29.3 mmol) was added to (3-bromo-4-fluorophenyl)hydrazine hydrochloride (6.4 g, 27 mmol). The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C. The mixture was stirred at 180° C. for 2.5 h and then cooled to 120° C. Methanol (300 mL) was added, and the mixture was stirred at ambient temperature for 18 h. The resulting suspension was filtered through a silica gel plug, and the silica gel was then washed with methanol (5×300 mL). The combined methanol fractions were concentrated under vacuum to provide the crude title compound (8.1 g) as a yellow solid, which was used in the next step without further purification: ESI MS m/z 257 [M+H]+. The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C cooled to 120° C the mixture was stirred at ambient temperature for 18 h The resulting suspension was filtered through a silica gel plug the silica gel was then washed with methanol (5×300 mL) The combined methanol fractions were concentrated under vacuum

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

Procedure: A solution of sodium nitrite (4.2 g, 60 mmol) was added drop-wise to a mixture of 3-bromo-4-fluoroaniline (11.2 g, 58.9 mmol) and concentrated HCl (30 mL, 0.36 M) at 0° C. over 30 min. The resulting clear solution was stirred for 45 min, and a solution of SnCl2.2H2O (27 g, 120 mmol) in concentrated HCl (30 mL) was added drop-wise at 0° C. over 1.5 h. The mixture was stirred for 18 h at room temperature. The resulting precipitate was collected by filtration and crystallized from ethanol to provide the title compound (6.2 g, 42%) as a yellow powder: 1H NMR (300 MHz, DMSO-d6) δ 10.24 (s, 3H), 8.42 (s, 1H), 7.36-7.30 (m, 2H), 7.03-6.98 (m, 1H). The mixture was stirred for 18 h at room temperature The resulting precipitate was collected by filtration crystallized from ethanol

Conditions: temp:180.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 4,4-Diethoxybutan-1-amine (4.72 g, 29.3 mmol) was added to (3-bromo-4-fluorophenyl)hydrazine hydrochloride (6.4 g, 27 mmol). The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C. The mixture was stirred at 180° C. for 2.5 h and then cooled to 120° C. Methanol (300 mL) was added, and the mixture was stirred at ambient temperature for 18 h. The resulting suspension was filtered through a silica gel plug, and the silica gel was then washed with methanol (5×300 mL). The combined methanol fractions were concentrated under vacuum to provide the crude title compound (8.1 g) as a yellow solid, which was used in the next step without further purification: ESI MS m/z 257 [M+H]+. The resulting mixture in an open round bottom flask was placed into a preheated oil bath at 180° C cooled to 120° C the mixture was stirred at ambient temperature for 18 h The resulting suspension was filtered through a silica gel plug the silica gel was then washed with methanol (5×300 mL) The combined methanol fractions were concentrated under vacuum

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

Procedure: A solution of sodium nitrite (4.2 g, 60 mmol) was added drop-wise to a mixture of 3-bromo-4-fluoroaniline (11.2 g, 58.9 mmol) and concentrated HCl (30 mL, 0.36 M) at 0° C. over 30 min. The resulting clear solution was stirred for 45 min, and a solution of SnCl2.2H2O (27 g, 120 mmol) in concentrated HCl (30 mL) was added drop-wise at 0° C. over 1.5 h. The mixture was stirred for 18 h at room temperature. The resulting precipitate was collected by filtration and crystallized from ethanol to provide the title compound (6.2 g, 42%) as a yellow powder: 1H NMR (300 MHz, DMSO-d6) δ 10.24 (s, 3H), 8.42 (s, 1H), 7.36-7.30 (m, 2H), 7.03-6.98 (m, 1H). The mixture was stirred for 18 h at room temperature The resulting precipitate was collected by filtration crystallized from ethanol