4-bromo-5-ethoxy-2-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:; See reaction.notes.procedure_details.

Procedure: 5-Amino-2-bromo-4-fluorophenol (10.30 g), ethyl iodide (9.36 g) and potassium carbonate (7.59 g) were suspended in acetonitrile (100 ml), and the mixture was heated under refluxing for about 6 hours. After the reaction, the precipitates were filtered, the solvent was distilled off, extracted with ethyl acetate, and dried over anhydrous magnesium sulfate. Then, ethyl acetate was distilled off, and the resulting oily substance was purified by chromatography on silica gel (ethyl acetate:n-hexane=1:3 v/v) to obtain the objective 4-bromo-5-ethoxy-2-fluoroaniline (7.93 g). the mixture was heated under refluxing for about 6 hours After the reaction the precipitates were filtered the solvent was distilled off extracted with ethyl acetate dried over anhydrous magnesium sulfate Then, ethyl acetate was distilled off the resulting oily substance was purified by chromatography on silica gel (ethyl acetate:n-hexane=1:3 v/v)

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl chloroformate (2.15 g) was added dropwise to a solution of 4-bromo-5-ethoxy-2-fluoroaniline (4.21 g) and pyridine (2.84 g) in methylene chloride (36 ml) at 0° C., and the mixture was stirred at 10° C. for 3 hours. After the reaction, this was extracted with methylene chloride, then washed with diluted hydrochloric acid and an aqueous sodium hydrogencarbonate solution, and dried over anhydrous magnesium sulfate. Then, methylene chloride was distilled off, and the resulting crude crystals were crystallized from a mixed solvent of ethyl acetate and n-hexane (1:5 v/v) to obtain the objective ethyl N-(4-bromo-5-ethoxy-2-fluorophenyl)carbamate (5.30 g). After the reaction this was extracted with methylene chloride washed with diluted hydrochloric acid an aqueous sodium hydrogencarbonate solution, and dried over anhydrous magnesium sulfate Then, methylene chloride was distilled off the resulting crude crystals were crystallized from a mixed solvent of ethyl acetate and n-hexane (1:5 v/v)

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl chloroformate (2.15 g) was added dropwise to a solution of 4-bromo-5-ethoxy-2-fluoroaniline (4.21 g) and pyridine (2.84 g) in methylene chloride (36 ml) at 0° C., and the mixture was stirred at 10° C. for 3 hours. After the reaction, this was extracted with methylene chloride, then washed with diluted hydrochloric acid and an aqueous sodium hydrogencarbonate solution, and dried over anhydrous magnesium sulfate. Then, methylene chloride was distilled off, and the resulting crude crystals were crystallized from a mixed solvent of ethyl acetate and n-hexane (1:5 v/v) to obtain the objective ethyl N-(4-bromo-5-ethoxy-2-fluorophenyl)carbamate (5.30 g). After the reaction this was extracted with methylene chloride washed with diluted hydrochloric acid an aqueous sodium hydrogencarbonate solution, and dried over anhydrous magnesium sulfate Then, methylene chloride was distilled off the resulting crude crystals were crystallized from a mixed solvent of ethyl acetate and n-hexane (1:5 v/v)

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: 5-Amino-2-bromo-4-fluorophenol (10.30 g), ethyl iodide (9.36 g) and potassium carbonate (7.59 g) were suspended in acetonitrile (100 ml), and the mixture was heated under refluxing for about 6 hours. After the reaction, the precipitates were filtered, the solvent was distilled off, extracted with ethyl acetate, and dried over anhydrous magnesium sulfate. Then, ethyl acetate was distilled off, and the resulting oily substance was purified by chromatography on silica gel (ethyl acetate:n-hexane=1:3 v/v) to obtain the objective 4-bromo-5-ethoxy-2-fluoroaniline (7.93 g). the mixture was heated under refluxing for about 6 hours After the reaction the precipitates were filtered the solvent was distilled off extracted with ethyl acetate dried over anhydrous magnesium sulfate Then, ethyl acetate was distilled off the resulting oily substance was purified by chromatography on silica gel (ethyl acetate:n-hexane=1:3 v/v)

Conditions: temp:10.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl chloroformate (2.15 g) was added dropwise to a solution of 4-bromo-5-ethoxy-2-fluoroaniline (4.21 g) and pyridine (2.84 g) in methylene chloride (36 ml) at 0° C., and the mixture was stirred at 10° C. for 3 hours. After the reaction, this was extracted with methylene chloride, then washed with diluted hydrochloric acid and an aqueous sodium hydrogencarbonate solution, and dried over anhydrous magnesium sulfate. Then, methylene chloride was distilled off, and the resulting crude crystals were crystallized from a mixed solvent of ethyl acetate and n-hexane (1:5 v/v) to obtain the objective ethyl N-(4-bromo-5-ethoxy-2-fluorophenyl)carbamate (5.30 g). After the reaction this was extracted with methylene chloride washed with diluted hydrochloric acid an aqueous sodium hydrogencarbonate solution, and dried over anhydrous magnesium sulfate Then, methylene chloride was distilled off the resulting crude crystals were crystallized from a mixed solvent of ethyl acetate and n-hexane (1:5 v/v)