乙基 5-氨基-2-氯-4-氟苯甲酸甲酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 19 g (87.4 mmol) of ethyl 5-amino-2-chloro-4-fluorobenzoate was dissolved in 120 ml of hydrochloric acid, followed by cooling to 0° C., to which a solution of 6.3 g (91.7 mmol) of sodium nitrite dissolved in 10 ml of water was added dropwise at 10° C. or lower. The mixture was stirred at 0° C. for 30 minutes and then cooled to −30° C., into which a solution of 58 g (0.31 mol) of anhydrous tin (II) chloride dissolved in 40 ml of hydrochloric acid was poured, followed by further stirring at 0° C. for 3 hours. The precipitated crystals were collected by filtration and then dried, which afforded 13.6 g (50.7 mmol) of crude ethyl 2-chloro-4-fluoro-5-hydrazinobenzoate hydrochloride. was added dropwise at 10° C. was poured by further stirring at 0° C. for 3 hours The precipitated crystals were collected by filtration dried

反应条件: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 60 g of iron powder and 500 ml of 10% acetic acid were mixed, and the mixture was heated to 40° C. Separately, 50 g (0.20 mol) of ethyl 2-chloro-4-fluoro-5-nitrobenzoate was dissolved in a mixed solution of 20 ml of acetic acid and 20 ml of ethyl acetate. and added dropwise to the above iron powder-acetic acid mixed solution. Then, the reaction mixture was stirred at 50° C. for 1 hour and filtered though celite. The filtrate was extracted with 100 ml of ethyl acetate. The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution, and dried with magnesium sulfate. The solvent was distilled out, and the residue was purified by silica gel chromatography, which afforded to 40 g (0.18 mol) of ethyl 5-amino-2-chloro-4-fluorobenzoate. filtered though celite The filtrate was extracted with 100 ml of ethyl acetate The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution dried with magnesium sulfate The solvent was distilled out the residue was purified by silica gel chromatography, which

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 19 g (87.4 mmol) of ethyl 5-amino-2-chloro-4-fluorobenzoate was dissolved in 120 ml of hydrochloric acid, followed by cooling to 0° C., to which a solution of 6.3 g (91.7 mmol) of sodium nitrite dissolved in 10 ml of water was added dropwise at 10° C. or lower. The mixture was stirred at 0° C. for 30 minutes and then cooled to −30° C., into which a solution of 58 g (0.31 mol) of anhydrous tin (II) chloride dissolved in 40 ml of hydrochloric acid was poured, followed by further stirring at 0° C. for 3 hours. The precipitated crystals were collected by filtration and then dried, which afforded 13.6 g (50.7 mmol) of crude ethyl 2-chloro-4-fluoro-5-hydrazinobenzoate hydrochloride. was added dropwise at 10° C. was poured by further stirring at 0° C. for 3 hours The precipitated crystals were collected by filtration dried

反应条件: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 60 g of iron powder and 500 ml of 10% acetic acid were mixed, and the mixture was heated to 40° C. Separately, 50 g (0.20 mol) of ethyl 2-chloro-4-fluoro-5-nitrobenzoate was dissolved in a mixed solution of 20 ml of acetic acid and 20 ml of ethyl acetate, and added dropwise to the above iron powder-acetic acid mixed solution. Then, the reaction mixture was stirred at 50° C. for 1 hour and filtered though celite. The filtrate was extracted with 100 ml of ethyl acetate. The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution, and dried with magnesium sulfate. The solvent was distilled out, and the residue was purified by silica gel chromatography, which afforded to 40 g (0.18 mol) of ethyl 5-amino-2-chloro-4-fluorobenzoate. filtered though celite The filtrate was extracted with 100 ml of ethyl acetate The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution dried with magnesium sulfate The solvent was distilled out the residue was purified by silica gel chromatography, which

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 19 g (87.4 mmol) of ethyl 5-amino-2-chloro-4-fluorobenzoate was dissolved in 120 ml of hydrochloric acid, followed by cooling to 0° C., to which a solution of 6.3 g (91.7 mmol) of sodium nitrite dissolved in 10 ml of water was added dropwise at 10° C. or lower. The mixture was stirred at 0° C. for 30 minutes and then cooled to −30° C., into which a solution of 58 g (0.31 mol) of anhydrous tin(II)chloride dissolved in 40 ml of hydrochloric acid was poured, followed by further stirring at 0° C. for 3 hours. The precipitated crystals were collected by filtration and then dried, which afforded 13.6 g (50.7 mmol) of crude ethyl 2-chloro-4-fluoro-5-hydrazinobenzoate hydrochloride. was added dropwise at 10° C. was poured by further stirring at 0° C. for 3 hours The precipitated crystals were collected by filtration dried

反应条件: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 60 g of iron powder and 500 ml of 10% acetic acid were mixed, and the mixture was heated to 40° C. Separately, 50 g (0.20 mol) of ethyl 2-chloro-4-fluoro-5-nitrobenzoate was dissolved in a mixed solution of 20 ml of acetic acid and 20 ml of ethyl acetate, and added dropwise to the above iron powder-acetic acid mixed solution. Then, the reaction mixture was stirred at 50° C. for 1 hour and filtered though celite. The filtrate was extracted with 100 ml of ethyl acetate. The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution, and dried with magnesium sulfate. The solvent was distilled out, and the residue was purified by silica gel chromatography, which afforded to 40 g (0.18 mol) of ethyl 5-amino-2-chloro-4-fluorobenzoate. filtered though celite The filtrate was extracted with 100 ml of ethyl acetate The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution dried with magnesium sulfate The solvent was distilled out the residue was purified by silica gel chromatography, which

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 19 g (87.4 mmol) of ethyl 5-amino-2-chloro-4-fluorobenzoate was dissolved in 120 ml of hydrochloric acid, followed by cooling to 0° C., to which a solution of 6.3 g (91.7 mmol) of sodium nitrite dissolved in 10 ml of water was added dropwise at 10° C. or lower. The mixture was stirred at 0° C. for 30 minutes and then cooled to −30° C., into which a solution of 58 g (0.31 mol) of anhydrous tin(II)chloride dissolved in 40 ml of hydrochloric acid was poured, followed by further stirring at 0° C. for 3 hours. The precipitated crystals were collected by filtration and then dried, which afforded 13.6 g (50.7 mmol) of crude ethyl 2-chloro-4-fluoro-5-hydrazinobenzoate hydrochloride. was added dropwise at 10° C. was poured by further stirring at 0° C. for 3 hours The precipitated crystals were collected by filtration dried

反应条件: temp:40.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 60 g of iron powder and 500 ml of 10% acetic acid were mixed, and the mixture was heated to 40° C. Separately, 50 g (0.20 mol) of ethyl 2-chloro-4-fluoro-5-nitrobenzoate was dissolved in a mixed solution of 20 ml of acetic acid and 20 ml of ethyl acetate, and added dropwise to the above iron powder-acetic acid mixed solution. Then, the reaction mixture was stirred at 50° C. for 1 hour and filtered though celite. The filtrate was extracted with 100 ml of ethyl acetate. The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution, and dried with magnesium sulfate. The solvent was distilled out, and the residue was purified by silica gel chromatography, which afforded to 40 g (0.18 mol) of ethyl 5-amino-2-chloro-4-fluorobenzoate. filtered though celite The filtrate was extracted with 100 ml of ethyl acetate The ethyl acetate layer was washed with aqueous sodium bicarbonate solution and saturated sodium chloride solution dried with magnesium sulfate The solvent was distilled out the residue was purified by silica gel chromatography, which

反应条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Then, 19 g (87.4 mmol) of ethyl 5-amino-2-chloro-4-fluorobenzoate was dissolved in 120 ml of hydrochloric acid, followed by cooling to 0° C., to which a solution of 6.3 g (91.7 mmol) of sodium nitrite dissolved in 10 ml of water was added dropwise at 10° C. or lower. The mixture was stirred at 0° C. for 30 minutes and then cooled to -30° C., into which a solution of 58 g (0.31 mol) of anhydrous tin (II) chloride dissolved in 40 ml of hydrochloric acid was poured, followed by further stirring at 0° C. for 3 hours. The precipitated crystals were collected by filtration and then dried, which afforded 13.6 g (50.7 mmol) of crude ethyl 2-chloro-4-fluoro-5-hydrazinobenzoate hydrochloride. was added dropwise at 10° C. was poured by further stirring at 0° C. for 3 hours The precipitated crystals were collected by filtration dried