2-(2,4-dichlorophenoxy)aniline;hydrochloride

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

Procedure: 2-(2,4-Dichlorophenoxy)aniline HCl (1.14 g, 3.94 mmol) and 5-bromo-6-chloropyridine-3-sulfonyl chloride (1.26 g, 4.33 mmol) were dissolved in pyridine (4 mL) and allowed to stir at ambient temperature for 1 hour. The reaction mixture was then diluted with 100 mL of ethyl acetate, 80 mL of 0.5 M HCl. The organic layer was washed successively with 100 mL of 0.5 M HCl, twice with 100 mL of water, 100 mL of half-saturated brine and finally 100 mL of brine. Drying of the organic layer over sodium sulfate was followed by filtration and solvent removal under reduced pressure. The resulting residue was purified by silica gel chromatography (linear gradient 60-100% DCM in hexanes) to yield 5-bromo-6-chloro-N-[2-(2,4-dichlorophenoxy)phenyl]pyridine-3-sulfonamide, giving proton NMR and mass spectral data consistent with theory. The organic layer was washed successively with 100 mL of 0.5 M HCl, twice with 100 mL of water, 100 mL of half-saturated brine and finally 100 mL of brine Drying of the organic layer over sodium sulfate was followed by filtration and solvent removal under reduced pressure The resulting residue was purified by silica gel chromatography (linear gradient 60-100% DCM in hexanes)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-nitrobenzenesulfonyl chloride (2.71 g, 12 mmol) and 2-(2,4-dichloro-phenoxy)aniline HCl (2.9 g, 10 mmol) were dissolved in pyridine (10 mL) at room temperature. After 1 hr the mixture was heated at 60° C. for 2 hour. The reaction mixture was concentrated under vacuum. The residue was diluted with EtOAc and washed sequentially with 1M aq. HCl and sat. aq. NaHCO3 and the organic extract dried over MgSO4, and the solvent removed in vacuo to afford the title compound as a solid. LCMS (ES MS, M+H+found: 439) and proton NMR (400 MHz, CDCl3) δ 6.54-6.62 (m, 2H), 7.02-7.18 (m, 4H), 7.43 (d, J=2.5 Hz, 1H), 7.73 (dd, J=8.1 and 1.6 Hz, 1H), 7.94 (d, J=8.6 Hz, 2H), 8.21 (d, J=8.6 Hz, 2H). The reaction mixture was concentrated under vacuum The residue was diluted with EtOAc washed sequentially with 1M aq. HCl and sat. aq. NaHCO3 the organic extract dried over MgSO4 the solvent removed in vacuo

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-nitrobenzenesulfonyl chloride (2.71 g, 12 mmol) and 2-(2,4-dichloro-phenoxy)aniline HCl (2.9 g, 10 mmol) were dissolved in pyridine (10 mL) at room temperature. After 1 hr the mixture was heated at 60° C. for 2 hour. The reaction mixture was concentrated under vacuum. The residue was diluted with EtOAc and washed sequentially with 1M aq. HCl and sat. aq. NaHCO3 and the organic extract dried over MgSO4, and the solvent removed in vacuo to afford the title compound as a solid. LCMS (ES MS, M+H+found: 439) and proton NMR (400 MHz, CDCl3) δ 6.54-6.62 (m, 2H), 7.02-7.18 (m, 4H), 7.43 (d, J=2.5 Hz, 1H), 7.73 (dd, J=8.1 and 1.6 Hz, 1H), 7.94 (d, J=8.6 Hz, 2H), 8.21 (d, J=8.6 Hz, 2H). The reaction mixture was concentrated under vacuum The residue was diluted with EtOAc washed sequentially with 1M aq. HCl and sat. aq. NaHCO3 the organic extract dried over MgSO4 the solvent removed in vacuo

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

Procedure: To a solution of 4-isocyanatobenzenesulfonyl chloride (0.20 g, 0.92 mmol) in pyridine (0.92 mL) at 0° C. was added methanol (38 μL, 0.92 mmol). The ice bath was removed after 5 min, and the reaction mixture was slowly warmed to room temperature. After 1.5 hrs of stirring, 2-(2,4-dichloro-phenoxy)aniline hydrochloride (0.27 g, 0.92 mmol) was added. After 1.5 hrs of stirring, the reaction mixture was diluted with ethyl acetate and washed with 0.5 N HCl (×2), water (×2), half brine and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated. The residue was purified by silica gel chromatography eluted with 10-60% ethyl acetate in hexane to provide the title compound. MS (ES, M+H+): 467.0. 1H NMR (400 MHz, CD3OD) δ 7.62 (m, 3H), 7.48 (d, J=2.4 Hz, 1H), 7.43 (dd, J=9.2 Hz, 2H), 7.09 (m, 3H), 6.58 (m, 1H), 6.37 (d, J=8.8 Hz, 1H), 3.76 (s, 3H). The ice bath was removed after 5 min After 1.5 hrs of stirring washed with 0.5 N HCl (×2), water (×2), half brine and brine The organic layer was dried over sodium sulfate filtered concentrated The residue was purified by silica gel chromatography eluted with 10-60% ethyl acetate in hexane

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

Procedure: 2-(2,4-Dichlorophenoxy)aniline HCl (1.14 g, 3.94 mmol) and 5-bromo-6-chloropyridine-3-sulfonyl chloride (1.26 g, 4.33 mmol) were dissolved in pyridine (4 mL) and allowed to stir at ambient temperature for 1 hour. The reaction mixture was then diluted with 100 mL of ethyl acetate, 80 mL of 0.5 M HCl. The organic layer was washed successively with 100 mL of 0.5 M HCl, twice with 100 mL of water, 100 mL of half-saturated brine and finally 100 mL of brine. Drying of the organic layer over sodium sulfate was followed by filtration and solvent removal under reduced pressure. The resulting residue was purified by silica gel chromatography (linear gradient 60-100% DCM in hexanes) to yield 5-bromo-6-chloro-N-[2-(2,4-dichlorophenoxy)phenyl]pyridine-3-sulfonamide, giving proton NMR and mass spectral data consistent with theory. The organic layer was washed successively with 100 mL of 0.5 M HCl, twice with 100 mL of water, 100 mL of half-saturated brine and finally 100 mL of brine Drying of the organic layer over sodium sulfate was followed by filtration and solvent removal under reduced pressure The resulting residue was purified by silica gel chromatography (linear gradient 60-100% DCM in hexanes)

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 4-nitrobenzenesulfonyl chloride (2.71 g, 12 mmol) and 2-(2,4-dichloro-phenoxy)aniline HCl (2.9 g, 10 mmol) were dissolved in pyridine (10 mL) at room temperature. After 1 hr the mixture was heated at 60° C. for 2 hour. The reaction mixture was concentrated under vacuum. The residue was diluted with EtOAc and washed sequentially with 1M aq. HCl and sat. aq. NaHCO3 and the organic extract dried over MgSO4, and the solvent removed in vacuo to afford the title compound as a solid. LCMS (ES MS, M+H+found: 439) and proton NMR (400 MHz, CDCl3) δ 6.54-6.62 (m, 2H), 7.02-7.18 (m, 4H), 7.43 (d, J=2.5 Hz, 1H), 7.73 (dd, J=8.1 and 1.6 Hz, 1H), 7.94 (d, J=8.6 Hz, 2H), 8.21 (d, J=8.6 Hz, 2H). The reaction mixture was concentrated under vacuum The residue was diluted with EtOAc washed sequentially with 1M aq. HCl and sat. aq. NaHCO3 the organic extract dried over MgSO4 the solvent removed in vacuo

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

Procedure: To a solution of 4-isocyanatobenzenesulfonyl chloride (0.20 g, 0.92 mmol) in pyridine (0.92 mL) at 0° C. was added methanol (38 μL, 0.92 mmol). The ice bath was removed after 5 min, and the reaction mixture was slowly warmed to room temperature. After 1.5 hrs of stirring, 2-(2,4-dichloro-phenoxy)aniline hydrochloride (0.27 g, 0.92 mmol) was added. After 1.5 hrs of stirring, the reaction mixture was diluted with ethyl acetate and washed with 0.5 N HCl (×2), water (×2), half brine and brine. The organic layer was dried over sodium sulfate, filtered, and concentrated. The residue was purified by silica gel chromatography eluted with 10-60% ethyl acetate in hexane to provide the title compound. MS (ES, M+H+): 467.0. 1H NMR (400 MHz, CD3OD) δ 7.62 (m, 3H), 7.48 (d, J=2.4 Hz, 1H), 7.43 (dd, J=9.2 Hz, 2H), 7.09 (m, 3H), 6.58 (m, 1H), 6.37 (d, J=8.8 Hz, 1H), 3.76 (s, 3H). The ice bath was removed after 5 min After 1.5 hrs of stirring washed with 0.5 N HCl (×2), water (×2), half brine and brine The organic layer was dried over sodium sulfate filtered concentrated The residue was purified by silica gel chromatography eluted with 10-60% ethyl acetate in hexane