(3,5-difluorophenyl)urea

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

Procedure: To a stirred solution of 3,5-difluoroaniline (4.0 g, 31 mmol, 1.00 equiv) in CH2Cl2 (50 mL) under argon at room temperature was added dropwise trimethylsilyl isocyanate (3.56 g, 30.90 mmol, 1.00 equiv). The reaction mixture was stirred overnight and quenched by the dropwise addition of CH3OH (50 mL). The reaction mixture was concentrated under reduced pressure and the resulting residue was purified by flash chromatography (silica gel, eluting with CHCl3/CH3OH (10:1 to 7:1)) to yield 2.0 g (38%) of the title compound as a white solid. 1H-NMR (400 MHz, DMSO-d6): δ ppm 8.96 (s, 1H), 7.16-7.10 (m, 2H), 6.72-6.66 (m, 1H), 6.07 (br s, 2H). quenched by the dropwise addition of CH3OH (50 mL) The reaction mixture was concentrated under reduced pressure the resulting residue was purified by flash chromatography (silica gel, eluting with CHCl3/CH3OH (10:1 to 7:1))

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

Procedure: To a stirred solution of 3,5-difluoroaniline (4.0 g, 31 mmol, 1.00 equiv) in CH2Cl2 (50 mL) under argon at room temperature was added dropwise trimethylsilyl isocyanate (3.56 g, 30.90 mmol, 1.00 equiv). The reaction mixture was stirred overnight and quenched by the dropwise addition of CH3OH (50 mL). The reaction mixture was concentrated under reduced pressure and the resulting residue was purified by silica gel column chromatography using CHCl3/CH3OH (10:1 to 7:1) as eluent to yield the title compound (2.0 g, 38%) as a white solid. 1H-NMR (400 MHz, DMSO-d6): δ ppm 8.96 (s, 1H), 7.16-7.10 (m, 2H), 6.72-6.66 (m, 1H), 6.07 (br s, 2H). quenched by the dropwise addition of CH3OH (50 mL) The reaction mixture was concentrated under reduced pressure the resulting residue was purified by silica gel column chromatography

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

Procedure: To a stirred solution of 3,5-difluoroaniline (4.0 g, 31 mmol, 1.00 equiv) in CH2Cl2 (50 mL) under argon at room temperature was added dropwise trimethylsilyl isocyanate (3.56 g, 30.90 mmol, 1.00 equiv). The reaction mixture was stirred overnight and quenched by the dropwise addition of CH3OH (50 mL). The reaction mixture was concentrated under reduced pressure and the resulting residue was purified by flash chromatography (silica gel, eluting with CHCl3/CH3OH (10:1 to 7:1)) to yield 2.0 g (38%) of the title compound as a white solid. 1H-NMR (400 MHz, DMSO-d6): δ ppm 8.96 (s, 1H), 7.16-7.10 (m, 2H), 6.72-6.66 (m, 1H), 6.07 (br s, 2H). quenched by the dropwise addition of CH3OH (50 mL) The reaction mixture was concentrated under reduced pressure the resulting residue was purified by flash chromatography (silica gel, eluting with CHCl3/CH3OH (10:1 to 7:1))