(2,5-difluorophenyl)urea

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

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 2,5-difluorophenyl isocyanate (1 g, 6.45 mmol) in tetrahydrofuran (50 mL) at 0° C. was added a 28% aqueous solution of ammonia (30 mL). The mixture was stirred for 1 h allowing the temperature to warm up to room temperature, then concentrated under reduced pressure, taken into water and filtered. The solid was washed twice with water and with ether, then dried at 65° C. under reduced pressure to give 740 mg (67%) of intermediate 6. concentrated under reduced pressure filtered The solid was washed twice with water and with ether dried at 65° C. under reduced pressure