(2-BROMO-5-FLUOROPHENYL)HYDRAZINEHYDROCHLORIDE

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared according to the procedure described in J. Org. Chem., 1956, 21, 1037. A stirred mixture of (2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (31.9 g, 0.132 mol) and s-triazine (10.7 g, 0.132 mol; Aldrich) in EtOH (250 mL) was heated at 90° C. for 3 h. After cooling, the insoluble material was filtered off and the filtrate was concentrated. The residue was partitioned between CH2Cl2 (200 mL) and water (200 mL), and the aqueous phase was extracted once more with CH2Cl2 and the combined extracts were dried (MgSO4), filtered and concentrated to a red semi-solid which was triturated with hexanes to give 19.6 g of the title compound as an orange solid: HPLC rt=1.68 min. LC/MS m/z 242 (M+H); 1H NMR (CDCl3, 500 MHz) δ ppm 7.02-7.15 (1H, m, 5-CH), 7.29 (1H, dd, J=8.4, 2.9 Hz, 3-CH), 7.68 (1H, dd, J=8.8, 5.5 Hz, 6-CH), 8.10 (1H, s, 8-CH), 8.54 (1H, s, 7-CH); 13C NMR (CDCl3, 125.8 Hz) δ ppm 112.54, 112.57 (d, J=1.5 Hz, 1-C), 115.68, 115.88 (d, J=25 Hz, 3-CH), 118.07, 118.25 (d, J=22 Hz, 5-CH), 135.11, 135.18 (d, J=8.6 Hz, 6-CH), 137.43, 137.52 (d, J=11 Hz, 2-C), 144.4 (7-CH), 152.6 (8-CH), 160.95, 162.94 (d, J=251 Hz, 4-CF); HRMS (ESI) calcd for C8H6BrN3 (M+H) 241.9727; found 241.9733 (δ 1.6 ppm); UV (MeOH) λmax 275 nm (ε1.45×103); Anal. calcd for C8H5BrFN3: C, 39.69; H, 2.08; N, 17.36; found C, 39.63; H, 1.83; N, 17.22. Prepared After cooling the insoluble material was filtered off the filtrate was concentrated The residue was partitioned between CH2Cl2 (200 mL) and water (200 mL) the aqueous phase was extracted once more with CH2Cl2 the combined extracts were dried (MgSO4) filtered concentrated to a red semi-solid which was triturated with hexanes

Conditions: temp:127.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 1-(2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (24.15 g, 100 mmol) and diacetamide (10.1 g, 100 mmol; Aldrich) in anhydrous pyridine (100 mL) was stirred in an oil bath heated at 125-130° C. under nitrogen for 2 h. After cooling the mixture was concentrated in vacuo to dryness, and the residue diluted with EtOAc (100 mL) was washed with water (50 mL), and then with brine (30 mL), dried (Na2SO4), filtered and concentrated to obtain 24.2 g of the title compound as a brownish oil: HPLC rt=1.59 min. LC/MS m/z 270/272 (M+H); 1H NMR (CDCl3, 500 MHz) δ ppm 2.30 (3H, s, 9-Me), 2.39 (3H, s, 10-Me), 7.10-7.15 (2H, m, 3,5-CH), 7.67 (1H, dd, J=8.5, 5.5 Hz, 6-H); 13C NMR (CDCl3, 125.8 Hz) δ ppm 12.4 (9-CH3), 13.8 (10-Me), 116.5 (d, J=4 Hz, 1-C), 117.2, (d, J=24 Hz, 3-CH), 118.9 (d, J=22 Hz, 5-CH), 134.7 (d, J=8.5 Hz, 6-CH), 137.8 (d, J=10 Hz, 2-C), 153.9 (7-C), 160.9 (8-C), 161.8 (d, J=251 Hz, 4-CF); HRMS (ESI) calcd for C10H10BrFN3 (M+H) 270.0042, found 270.0048 (δ+2.2 ppm). This triazole was also prepared in 62% yield from 1-(2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride and 2,4,6-trimethyl-s-triazine by refluxing them in EtOH. After cooling the mixture was concentrated in vacuo to dryness the residue diluted with EtOAc (100 mL) was washed with water (50 mL) with brine (30 mL), dried (Na2SO4) filtered concentrated

Conditions: temp:-2.51; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a mechanically stirred suspension of 2-bromo-5-fluoroaniline hydrochloride (94.7 g, 0.418 mol; obtained above) in a mixture of conc-HCl (250 mL) and water (250 mL) was added drop-wise a solution of sodium nitrite, NaNO2 (29 g, 0.420 mol) in water (60 mL) in a dry-ice/acetone bath, maintaining the bath temperature at −5-0° C. over a period of 10-15 min. Additional NaNO2 (1 g) was added and stirred at the same temperature for 5 min to obtain a clear solution. To this clear solution was added a solution of stannous chloride, SnCl2 (276.8 g, 1.46 mol) in conc-HCl (600 mL) drop-wise at 0-5° C. over a period of 30-40 min. A precipitate starts forming immediately after the addition. This thick mixture was stirred for another 1.5 h, and the precipitate was collected by suction-filtration, washed with a minimum amount of water (˜200 mL), then with diethyl ether, and dried in vacuo to obtain the title compound as an off-white powder: HPLC rt=0.73 min; LC/MS m/z 205 (M+H); 1H NMR (DMSO-d6, 500 MHz) δ ppm 6.78 (1H, dt, J=8.5, 3 Hz, 5-CH), 7.04 (1H, dd, J=11, 3 Hz, 3-CH), 7.60 (1H, dd, J=8.5, 6 Hz, 6-CH), 8.15 (1H, s, NH), 10.49 (3H, brs, NH3+); 13C NMR (DMSO-d6, 125.8 Hz) δ ppm 102.6 (d, J=28 Hz, 3-CH), 103.4 (d, J=2.6 Hz, 1-C), 109.0 (d, J=23 Hz, 5-CH), 133.8 (d, J=9.6 Hz, 6-CH), 144.0 (d, J=10.7 Hz, 2-C), 161.7 (d, J=243 Hz, 4-CF). to obtain a clear solution A precipitate starts forming immediately after the addition This thick mixture was stirred for another 1.5 h the precipitate was collected by suction-filtration washed with a minimum amount of water (˜200 mL) with diethyl ether, and dried in vacuo

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

Procedure: Alternatively, to a mixture of (2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (5.9 g, 28.8 mmol) and N-((dimethylamino)methylene)acetamide (3.30 g, 28.8 mmol) in THF (30 mL) was added 5 drops of HOAc, and the mixture stirred at room temperature under nitrogen for 15 min. The mixture was concentrated in vacuo, and the residue suspended in a mixture of ether (50 mL) and hexanes (50 mL) and the resulting precipitate collected and air-dried to provide 5.7 g of the title compound as an off-white powder. A second crop gave an additional 0.3 g. The mixture was concentrated in vacuo the residue suspended in a mixture of ether (50 mL) and hexanes (50 mL) the resulting precipitate collected air-dried

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

Procedure: To a solution of (2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (1.21 g, 5 mmol) in pyridine (3 mL) was added a solution of N-((dimethylamino)methylene)acetamide (600 mg, 5.26 mmol) in pyridine (2 mL) and the mixture stirred at room temperature under nitrogen for 1 h. The precipitate formed was collected, washed with CH2Cl2 and then with ether to obtain 1.15 g (3.16 mmol, 63% yield) of the title compound which was contaminated with 1 mole of dimethylamine hydrochloride as a white crystalline powder: HPLC: 2.22 min (AP 84% at 220 nm); LC/MS m/z 274/276 (M+H); 1H NMR (DMSO-d6, 500 MHz) δ ppm 2.00 (3H, s, 9-Me), 2.51 (6H, s, 2 N—CH3), 6.45 (1H, dt, J=8.5, 3 Hz, 5-CH), 6.89 (1H, dd, J=12, 3 Hz, 3-CH), 7.43 (1H, dd, J=8.5, 6 Hz, 6-CH), 8.68 (1H, d, J=9.5 Hz, 7-CH), 8.88 (2H, br.s, NH2+), 9.24 (1H, s, 7-NH), 10.54 (1H, d, J=9.5 Hz, 2-NH); No signals from the rotational isomer were observed; 13C NMR (CDCl3, 125.8 Hz) δppm 22.6 (9-CH3), 33.9 (2 NCH3), 99.6 (d, J=28 Hz, 3-CH), 99.7 (1-C), 105.0 (d, J=24 Hz, 5-CH), 133.5 (d, J=10.6 Hz, 6-CH), 137.1 (7-CH), 144.9 (d, J=11.6 Hz, 2-C), 162.4 (d, J=244 Hz, 4-CF), 168.5 (8-C═O). No signals from the rotational isomer were observed; Anal. calcd for C9H9BrFN3O.Me2NH.HCl.1/2H2O: C36.24, H4.99, N15.37, found C35.88, H4.87, N15.23. An analytical sample of the title compound without contamination of dimethylamine hydrochloride was obtained by column purification (SiO2, 10-15% EtOAc—CH2Cl2): TLC Rf 0.55 (20% EtOAc—CH2Cl2); HPLC: 2.17 min (AP 88% at 220 nm); LC/MS m/z 274/276 (M+H); 1H NMR (DMSO-d6, 500 MHz) δ ppm 1.99 (3H, s, 9-Me), 6.45 (1H, dt, J=8.5, 3 Hz, 5-CH), 6.88 (1H, dd, J=12, 3 Hz, 3-CH), 7.43 (1H, dd, J=9, 6 Hz, 6-CH), 8.69 (1H, d, J=9.5 Hz, 7-CH), 9.23 (1H, s, 7-NH), 10.52 (1H, d, J=9.5 Hz, 2-NH); About 16% of rotational isomer was also observed as a set of minor peaks: 1H NMR (DMSO-d6, 500 MHz) δ ppm 2.11 (3H, s, 9′-Me), 6.58 (1H, dt, J=8.5, 3 Hz, 5′-CH), 7.10 (1H, dd, J=11.6, 3 Hz, 3′-CH), 7.29 (1H, d, J=2.4 Hz, 7′-CH), 7.50 (1H, dd, J=8.7, 6 Hz, 6′-CH), 8.35 (1H, s, 2′-NH), 10.70 (1H, s, 7′-NH); 13C NMR (DMSO-d6, 125.8 Hz) δppm 22.6 (9-CH3), 99.7 (d, J=29 Hz, 3-CH), 99.8 (d, J=3 Hz, 1-C), 105.0 (d, J=24 Hz, 5-CH), 133.6 (d, J=10.6 Hz, 6-CH), 137.1 (7-CH), 144.9 (d, J=11.6 Hz, 2-C), 162.5 (d, J=241 Hz, 4-CF), 168.5 (8-C═O); 13C NMR (DMSO-d6, 125.8 Hz) δ ppm 22.9 (9′-CH3), 100.7 (d, J=3 Hz, 1′-C), 101.6 (d, J=29 Hz, 3′-CH), 106.8 (d, J=24 Hz, 5′-CH), 133.6 (d, J=9.6 Hz, 6′-CH), 162.4 (d, J=242 Hz, 4′-CF), 168.6 (8′-C═O); HRMS (ESI) calcd for C9H10BrFN3O (M+H) 273.9991, found 274.0004 (δ+4.6 ppm); Anal. calcd for C9H9BrFN3O: C39.43, H3.31, N29.15, found C39.67, H2.99, N29.09. The precipitate formed was collected washed with CH2Cl2

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

Procedure: To a suspension of (2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (41 g, 0.17 mol; prepared from 2-bromo-5-fluoroaniline by the method described in U.S. Pat. No. 3,959,309 (1976) p-23, and p-48) in water (300 mL) and CH2Cl2 (200 mL) was added 1N—NaOH (200 mL) until the solution was basic. The CH2Cl2 layer was separated and the aqueous portion was further extracted with CH2Cl2 (150 mL). The combined organic extracts were dried (MgSO4), filtered, and concentrated to obtain 33 g (0.16 mol) of the title compound as an off-white powder: HPLC: 0.89 min (AP 97% at 220 nm); 1H NMR (CDCl3, 500 MHz) δ ppm 3.62 (2H, s, NH2), 5.75 (1H, s, NH), 6.37 (1H, m, 5-CH), 6.87 (1H, dd, J=11, 3 Hz, 3-CH), 7.31 (1H, dd, J=8.6, 5.8 Hz, 6-CH); 13C NMR (CDCl3, 125.8 Hz) 8 ppm 100.0 (d, J=29 Hz, 3-CH), 101.4 (d, J=2.9 Hz, 1-C), 106.1 (d, J=23 Hz, 5-CH), 133.1 (d, J=9.6 Hz, 6-CH), 149.1 (d, J=10.6 Hz, 2-C), 163.5 (d, J=244 Hz, 4-CF); LC/MS m/z 205/207 (M+H). The CH2Cl2 layer was separated the aqueous portion was further extracted with CH2Cl2 (150 mL) The combined organic extracts were dried (MgSO4) filtered concentrated

Conditions: temp:90.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Prepared according to the procedure described in J. Org. Chem., 1956, 21, 1037. A stirred mixture of (2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (31.9 g, 0.132 mol) and s-triazine (10.7 g, 0.132 mol; Aldrich) in EtOH (250 mL) was heated at 90° C. for 3 h. After cooling, the insoluble material was filtered off and the filtrate was concentrated. The residue was partitioned between CH2Cl2 (200 mL) and water (200 mL), and the aqueous phase was extracted once more with CH2Cl2 and the combined extracts were dried (MgSO4), filtered and concentrated to a red semi-solid which was triturated with hexanes to give 19.6 g of the title compound as an orange solid: HPLC rt=1.68 min. LC/MS m/z 242 (M+H); 1H NMR (CDCl3, 500 MHz) δ ppm 7.02–7.15 (1H, m, 5-CH), 7.29 (1H, dd, J=8.4, 2.9 Hz, 3-CH), 7.68 (1H, dd, J=8.8, 5.5 Hz, 6-CH), 8.10 (1H, s, 8-CH), 8.54 (1H, s, 7-CH); 13C NMR (CDCl3, 125.8 Hz) δ ppm 112.54, 112.57 (d, J=1.5 Hz, 1-C), 115.68, 115.88 (d, J=25 Hz, 3-CH), 118.07, 118.25 (d, J=22 Hz, 5-CH), 135.11, 135.18 (d, J=8.6 Hz, 6-CH), 137.43, 137.52 (d, J=11 Hz, 2-C), 144.4 (7-CH), 152.6 (8-CH), 160.95, 162.94 (d, J=251 Hz, 4-CF); HRMS (ESD) calcd for C8H6FBrN3 (M+H) 241.9727. found 241.9733 (δ 1.6 ppm); UV (MeOH) λmax 275 nm (ε 1.45×103); Anal. calcd for C8H5BrFN3: C, 39.69; H, 2.08; N, 17.36. found C, 39.63; H, 1.83; N, 17.22. Prepared After cooling the insoluble material was filtered off the filtrate was concentrated The residue was partitioned between CH2Cl2 (200 mL) and water (200 mL) the aqueous phase was extracted once more with CH2Cl2 the combined extracts were dried (MgSO4) filtered concentrated to a red semi-solid which was triturated with hexanes

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

Procedure: A mixture of 1-(2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride (24.15 g, 100 mmol) and diacetamide (10.1 g, 100 mmol; Aldrich) in anhydrous pyridine (100 mL) was stirred in an oil bath heated at 125–130° C. under nitrogen for 2 h. After cooling the mixture was concentrated in vacuo to dryness, and the residue diluted with EtOAc (100 mL) was washed with water (50 mL), and then with brine (30 mL), dried (Na2SO4), filtered and concentrated to obtain 24.2 g of the title compound as a brownish oil: HPLC rt=1.59 min. LC/MS m/z 270/272 (M+H); 1H NMR (CDCl3, 500 MHz) δ ppm 2.30 (3H, s, 9-Me), 2.39 (3H, s, 10-Me), 7.10–7.15 (2H, m, 3,5-CH), 7.67 (1H, dd, J=8.5, 5.5 Hz, 6-H); 13C NMR (CDCl3, 125.8 Hz) δ ppm 12.4 (9-CH3), 13.8 (10-Me), 116.5 (d, J=4 Hz, 1-C), 117.2, (d, J=24 Hz, 3-CH), 118.9 (d, J=22 Hz, 5-CH), 134.7 (d, J=8.5 Hz, 6-CH), 137.8 (d, J=10 Hz, 2-C), 153.9 (7-C), 160.9 (8-C), 161.8 (d, J=251 Hz, 4-CF); HRMS (ESI) calcd for C10H10BrFN3 (M+H) 270.0042. found 270.0048 (δ +2.2 ppm). This triazole was also prepared in 62% yield from 1-(2-bromo-5-fluoro-phenyl)-hydrazine hydrochloride and 2,4,6-trimethyl-s-triazine by refluxing them in EtOH. heated at 125–130° C. under nitrogen for 2 h After cooling the mixture was concentrated in vacuo to dryness the residue diluted with EtOAc (100 mL) was washed with water (50 mL) with brine (30 mL), dried (Na2SO4) filtered concentrated

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

Procedure: To a mechanically stirred suspension of 2-bromo-5-fluoroaniline hydrochloride (94.7 g, 0.418 mol; obtained above) in a mixture of conc-HCl (250 mL) and water (250 mL) was added drop-wise a solution of sodium nitrite, NaNO2 (29 g, 0.420 mol) in water (60 mL) in a dry-ice/acetone bath, maintaining the bath temperature at −5–0° C. over a period of 10–15 min. Additional NaNO2 (1 g) was added and stirred at the same temperature for 5 min to obtain a clear solution. To this clear solution was added a solution of stannous chloride, SnCl2 (276.8 g, 1.46 mol) in conc-HCl (600 mL) drop-wise at 0–5° C. over a period of 30–40 min. A precipitate starts forming immediately after the addition. This thick mixture was stirred for another 1.5 h, and the precipitate was collected by suction-filtration, washed with a minimum amount of water (˜200 mL), then with diethyl ether, and dried in vacuo to obtain the title compound as an off-white powder: HPLC rt=0.73 min; LC/MS m/z 205 (M+H); 1H NMR (DMSO-d6, 500 MHz) δ ppm 6.78 (1H, dt, J=8.5, 3 Hz, 5-CH), 7.04 (1H, dd, J=11, 3 Hz, 3-CH), 7.60 (1H, dd, J=8.5, 6 Hz, 6-CH), 8.15 (1H, s, NH), 10.49 (3H, brs, NH3+); 13C NMR (DMSO-d6, 125.8 Hz) δ ppm 102.6 (d, J=28 Hz, 3-CH), 103.4 (d, J=2.6 Hz, 1-C), 109.0 (d, J=23 Hz, 5-CH), 133.8 (d, J=9.6 Hz, 6-CH), 144.0 (d, J=10.7 Hz, 2-C), 161.7 (d, J=243 Hz, 4-CF). maintaining the bath temperature at −5–0° C. over a period of 10–15 min to obtain a clear solution A precipitate starts forming immediately after the addition This thick mixture was stirred for another 1.5 h the precipitate was collected by suction-filtration washed with a minimum amount of water (˜200 mL) with diethyl ether, and dried in vacuo