2-bromo-6-fluoroaniline

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

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

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

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

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

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

Conditions: temp:81.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-Methoxy-5-trifluoromethylphenyl isocyanate (1.19 kg) is fused at about 35° C. and dissolved in acetonitrile (4.2 l), then 2-bromo-6-fluoroaniline (870 g) is added and rinsed out with acetonitrile (380 ml). The resulting clear solution is stirred at 74-88° C. for 45 h, then concentrated in vacuo (200 mbar) at 50° C. to give a viscous magma (amount of distillate 4.4 l). This is diluted at room temperature with diisopropyl ether (1.5 l), filtered off with suction, washed with diisopropyl ether (1.15 l) and dried at 45° C. in the VDO using entraining nitrogen to constant mass (24 h). A total of 1.63 kg of N-(2-bromo-6-fluorophenyl)-N′-[2-methoxy-5-(trifluoromethyl)phenyl]urea is obtained as a solid, corresponding to 87.5% of theory. is fused at about 35° C. rinsed out with acetonitrile (380 ml) concentrated in vacuo (200 mbar) at 50° C. to give a viscous magma (amount of distillate 4.4 l) filtered off with suction washed with diisopropyl ether (1.15 l) dried at 45° C. in the VDO to constant mass (24 h)

Conditions: temp:85.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-Methoxy-5-trifluoromethylphenyl isocyanate (274.3 g) is dissolved in acetonitrile (1 l), then 2-bromo-6-fluoroaniline (200 g) is added and rinsed out with acetonitrile (50 ml). The resulting clear solution is stirred under reflux (ca. 85° C.) for 38 h, then concentrated in vacuo at 40° C. to a viscous magma. This is filtered off with suction, washed with acetonitrile (260 ml, cooled to 0-5° C.) and dried overnight at 45° C. in the VDO using entraining nitrogen. A total of 424.3 g of N-(2-bromo-6-fluorophenyl)-N′-[2-methoxy-5-(trifluoromethyl)phenyl]urea are obtained as a solid, corresponding to 99.2% of theory. rinsed out with acetonitrile (50 ml) concentrated in vacuo at 40° C. to a viscous magma This is filtered off with suction washed with acetonitrile (260 ml, cooled to 0-5° C.) dried overnight at 45° C. in the VDO

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-Bromo-6-fluoroaniline (2.0 g, 11 mmol) was dissolved in hydrochloric acid (7.0 mL, 12 N aqueous, 84 mmol, 8 equiv) and cooled to 0° C. An aqueous solution (10 mL) of sodium nitrite (0.80 g, 12 mmol, 1.1 equiv) was added dropwise over 30 minutes via additional funnel and the mixture was stirred for an additional 30 minutes at 0° C. A hydrochloric acid solution (10 mL, 12 N aqueous) of stannous(II) chloride dihydrate (7.1 g, 32 mmol, 3 equiv) was then added to the mixture over 45 minutes via additional funnel and the mixture was stirred for an additional 1 hour at 0° C. To the mixture, sodium hydroxide (30 mL, 1 M aqueous) was added slowly until basic by pH paper. The mixture was warmed to ambient temperature, poured into sodium hydroxide (50 mL, 25% aqueous) and the aqueous layer was extracted with diethyl ether (3×250 mL). The combined organic extracts were dried with sodium sulfate, filtered and partially concentrated in vacuo. The residue was taken up in diethyl ether and treated with gaseous hydrochloric acid. The solid was filtered and washed with diethyl ether, providing the titled compound as a white solid. the mixture was stirred for an additional 1 hour at 0° C The mixture was warmed to ambient temperature the aqueous layer was extracted with diethyl ether (3×250 mL) The combined organic extracts were dried with sodium sulfate filtered partially concentrated in vacuo treated with gaseous hydrochloric acid The solid was filtered washed with diethyl ether

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

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

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 2-Bromo-6-fluoroaniline (2.0 g, 10 mmol) was dissolved in hydrochloric acid (7.0 mL, 12 N aqueous, 8.0 equiv) and cooled to 0° C. An aqueous solution (10 mL) of sodium nitrite (0.80 g, 11 mmol, 1.1 equiv) was added dropwise over 30 minutes via addition funnel and the mixture was stirred for an additional 30 minutes at 0° C. A hydrochloric acid solution (10 mL, 12 N aqueous) of stannous chloride (7.1 g, 31 mmol, 3.0 equiv) was then added to the mixture over 45 minutes via addition funnel and the mixture was stirred for an additional 1 hour at 0° C. To the mixture, sodium hydroxide (30 mL, 1 N aqueous) was added slowly until basic (pH>8). The mixture was warmed to ambient temperature, poured into sodium hydroxide (50 mL, 25% aqueous) and the aqueous layer was extracted with diethyl ether (3×250 mL). The combined organic extracts were dried with sodium sulfate, filtered and partially concentrated in vacuo. The mixture was diluted with diethyl ether (200 mL) and treated with gaseous hydrochloric acid until saturated, resulting in a white precipitate, which was filtered and washed with diethyl ether (2×50 mL), providing the titled compound as a white solid. the mixture was stirred for an additional 1 hour at 0° C The mixture was warmed to ambient temperature the aqueous layer was extracted with diethyl ether (3×250 mL) The combined organic extracts were dried with sodium sulfate filtered partially concentrated in vacuo The mixture was diluted with diethyl ether (200 mL) treated with gaseous hydrochloric acid until saturated, resulting in a white precipitate, which was filtered washed with diethyl ether (2×50 mL)