2-bromo-4,5-difluorobenzoyl chloride

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

Procedure: 1.05 g of 2-bromo-4,5-difluorobenzoyl chloride in 5 ml of DCM are added dropwise with stirring to a solution of 846.9 μl of diethylamine in 5 ml of DCM. The mixture is subsequently stirred at RT for 1 h. The mixture is then extracted a number of times against water (pH 9), the organic phase is dried and purified by column chromatography. The mixture is then extracted a number of times against water (pH 9) the organic phase is dried purified by column chromatography

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

Procedure: Magnesium ribbon (7.3 g) is suspended in absolute ethanol (15 ml), and thereto is added carbon tetrachloride (1.5 ml), and thereto is added dropwise a mixture of diethyl malonate (48 g), absolute ethanol (30 ml) and anhydrous ether (120 ml) over a period of one hour. After the addition, the mixture is refluxed for 2 hours. After cooling till room temperature, a solution of 2-bromo-4,5-difluorobenzoyl chloride (92 g) in anhydrous ether (50 ml) is added dropwise to the mixture. After the addition, the mixture is allowed to stand overnight at room temperature. A mixture of ice-water (120 ml) and conc. sulfuric acid (8 ml) is added dropwise to the reaction mixture under ice-cooling. After the addition, the mixture is extracted with ether. The ether layer is washed with saturated aqueous sodium chloride solution and dried over magnesium sulfate. The solvent is distilled off under reduced pressure to give diethyl (2-bromo-4,5-difluorobenzoyl)malonate (123 g). is added dropwise After the addition the mixture is refluxed for 2 hours After the addition is added dropwise to the reaction mixture under ice- cooling After the addition the mixture is extracted with ether The ether layer is washed with saturated aqueous sodium chloride solution dried over magnesium sulfate The solvent is distilled off under reduced pressure

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

Procedure: Magnesium ribbon (7.3 g) is suspended in absolute ethanol (15 ml), and thereto is added carbon tetrachloride (1.5 ml), and thereto is added dropwise a mixture of diethyl malonate (48 g), absolute ethanol (30 ml) and anhydrous ether (120 ml) over a period of one hour. After the addition, the mixture is refluxed for 2 hours. After cooling till room temperature, a solution of 2-bromo-4,5-difluorobenzoyl chloride (92 g) in anhydrous ether (50 ml) is added dropwise to the mixture. After the addition, the mixture is allowed to stand overnight at room temperature. A mixture of ice-water (120 ml) and conc. sulfuric acid (8 ml) is added dropwise to the reaction mixture under ice-cooling. After the addition, the mixture is extracted with ether. The ether layer is washed with saturated aqueous sodium chloride solution and dried over magnesium sulfate. The solvent is distilled off under reduced pressure to give diethyl (2-bromo-4,5-difluorobenzoyl)malonate (123 g). is added dropwise After the addition the mixture is refluxed for 2 hours After the addition is added dropwise to the reaction mixture under ice- cooling After the addition the mixture is extracted with ether The ether layer is washed with saturated aqueous sodium chloride solution dried over magnesium sulfate The solvent is distilled off under reduced pressure

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

Procedure: Magnesium ribbon (7.3 g) is suspended in absolute ethanol (15 ml), and thereto is added carbon tetrachloride (1.5 ml), and thereto is added dropwise a mixture of diethyl malonate (48 g), absolute ethanol (30 ml) and anhydrous ether (120 ml) over a period of one hour. After the addition, the mixture is refluxed for 2 hours. After cooling till room temperature, a solution of 2-bromo-4,5-difluorobenzoyl chloride (92 g) in anhydrous ether (50 ml) is added dropwise to the mixture. After the addition, the mixture is allowed to stand overnight at room temperature. A mixture of ice-water (120 ml) and conc. sulfuric acid (8 ml) is added dropwise to the reaction mixture under ice-cooling. After the addition, the mixture is extracted with ether. The ether layer is washed with saturated aqueous sodium chloride solution and dried over magnesium sulfate. The solvent is distilled off under reduced pressure to give diethyl (2-bromo-4,5-difluorobenzoyl)malonate (123 g). is added dropwise After the addition the mixture is refluxed for 2 hours After the addition is added dropwise to the reaction mixture under ice- cooling After the addition the mixture is extracted with ether The ether layer is washed with saturated aqueous sodium chloride solution dried over magnesium sulfate The solvent is distilled off under reduced pressure

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

Procedure: Thionyl chloride (70 ml) is added to 2-bromo-4,5-difluorobenzoic acid (39.5 g), and the mixture is allowed to stand at room temperature for one hour and then refluxed for one hour. After completion of the reaction, the excess thionyl chloride is distilled off under reduced pressure. The oily residue is distilled under reduced pressure to give 2-bromo-4,5-difluorobenzoyl chloride (37.8 g) as a pale yellow oily substance, b.p. 121°-123° C. (32 mmHg). refluxed for one hour After completion of the reaction the excess thionyl chloride is distilled off under reduced pressure The oily residue is distilled under reduced pressure

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

Procedure: Thionyl chloride (70 ml) is added to 2-bromo-4,5-difluorobenzoic acid (39.5 g), and the mixture is allowed to stand at room temperature for one hour and then refluxed for one hour. After completion of the reaction, the excess thionyl chloride is distilled off under reduced pressure. The oily residue is distilled under reduced pressure to give 2-bromo-4,5-difluorobenzoyl chloride (37.8 g) as a pale yellow oily substance, b.p. 121°-123° C. (32 mmHg). refluxed for one hour After completion of the reaction the excess thionyl chloride is distilled off under reduced pressure The oily residue is distilled under reduced pressure

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

Procedure: Magnesium ribbon (7.3 g) is suspended in absolute ethanol (15 ml), and thereto is added carbon tetrachloride (1.5 ml), and thereto is added dropwise a mixture of diethyl malonate (48 g), absolute ethanol (30 ml) and anhydrous ether (120 ml) over a period of one hour. After the addition, the mixture is refluxed for 2 hours. After cooling till room temperature, a solution of 2-bromo-4,5-difluorobenzoyl chloride (92 g) in anhydrous ether (50 ml) is added dropwise to the mixture. After the addition, the mixture is allowed to stand overnight at room temperature. A mixture of ice-water (120 ml) and conc. sulfuric acid (8 ml) is added dropwise to the reaction mixture under ice-cooling. After the addition, the mixture is extracted with ether. The ether layer is washed with saturated aqueous sodium chloride solution and dried over magnesium sulfate. The solvent is distilled off under reduced pressure to give diethyl (2-bromo-4,5-difluorobenzoyl)malonate (123 g). is added dropwise After the addition the mixture is refluxed for 2 hours After the addition is added dropwise to the reaction mixture under ice- cooling After the addition the mixture is extracted with ether The ether layer is washed with saturated aqueous sodium chloride solution dried over magnesium sulfate The solvent is distilled off under reduced pressure

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

Procedure: Thionyl chloride (70 ml) is added to 2-bromo-4,5-difluorobenzoic acid (39.5 g), and the mixture is allowed to stand at room temperature for one hour and then refluxed for one hour. After completion of the reaction, the excess thionyl chloride is distilled off under reduced pressure. The oily residue is distilled under reduced pressure to give 2-bromo-4,5-difluorobenzoyl chloride (37.8 g) as a pale yellow oily substance, b.p. 121°-123° C. (32 mmHg). refluxed for one hour After completion of the reaction the excess thionyl chloride is distilled off under reduced pressure The oily residue is distilled under reduced pressure

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

Procedure: 1.05 g of 2-bromo-4,5-difluorobenzoyl chloride in 5 ml of DCM are added dropwise with stirring to a solution of 846.9 μl of diethylamine in 5 ml of DCM. The mixture is subsequently stirred at RT for 1 h. The mixture is then extracted a number of times against water (pH 9), the organic phase is dried and purified by column chromatography. The mixture is then extracted a number of times against water (pH 9) the organic phase is dried purified by column chromatography