difluoromethyl trifluoromethanesulfonate

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

Procedure: 4.8 ml of aqueous potassium hydroxide solution (6M) were added to a solution of 600 mg (purity 93%, 2.22 mmol) of 4-iodo-6-methoxypyridin-3-ol in 4.8 ml of acetonitrile, the mixture was cooled in an ice bath and 863 μl (purity 75%, 3.56 mmol, 1.6 eq.) of difluoromethyl trifluoromethanesulphonate [Angew. Chem. Int. Ed. 2013, 52, 1-5; Journal of Fluorine Chemistry 2009, 130, 667-670] were added with vigorous stirring. The reaction mixture was stirred for 2 min and diluted with 33 ml of water. The aqueous phase was extracted twice with in each case 40 ml of diethyl ether. The combined organic phases were dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. The crude product was purified by flash chromatography (IR-50SI, petroleum ether/ethyl acetate 12-20%). Yield: 407 mg (purity 90%, 55% of theory) the mixture was cooled in an ice bath The aqueous phase was extracted twice with in each case 40 ml of diethyl ether The combined organic phases were dried (sodium sulphate) filtered concentrated under reduced pressure dried The crude product was purified by flash chromatography (IR-50SI, petroleum ether/ethyl acetate 12-20%)

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

Procedure: 36 ml of aqueous potassium hydroxide solution (6M) were added to a solution of 3.5 g (16.9 mmol) of 2-bromo-4-chlorophenol in 36 ml of acetonitrile, the mixture was cooled in an ice bath and 6.5 ml (26.9 mmol, 1.6 eq.) of difluoromethyl trifluormethanesulphonate [Angew. Chem. Int. Ed. 2013, 52, 1-5; Journal of Fluorine Chemistry 2009, 130, 667-670] were added dropwise with vigorous stirring. The reaction mixture was stirred for 5 min and diluted with 200 ml of water. The aqueous phase was extracted twice with in each case 150 ml of diethyl ether. The combined organic phases were dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. The aqueous phase was once more extracted with diethyl ether. The organic phase was dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. Yield of the two combined residues: 3.4 g (80% of theory) the mixture was cooled in an ice bath The aqueous phase was extracted twice with in each case 150 ml of diethyl ether The combined organic phases were dried (sodium sulphate) filtered concentrated under reduced pressure dried The aqueous phase was once more extracted with diethyl ether The organic phase was dried (sodium sulphate) filtered concentrated under reduced pressure dried

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

Procedure: 4.8 ml of aqueous potassium hydroxide solution (6M) were added to a solution of 600 mg (purity 93%, 2.22 mmol) of 4-iodo-6-methoxypyridin-3-ol in 4.8 ml of acetonitrile, the mixture was cooled in an ice bath and 863 μl (purity 75%, 3.56 mmol, 1.6 eq.) of difluoromethyl trifluoromethanesulphonate [Angew. Chem. Int. Ed. 2013, 52, 1-5; Journal of Fluorine Chemistry 2009, 130, 667-670] were added with vigorous stirring. The reaction mixture was stirred for 2 min and diluted with 33 ml of water. The aqueous phase was extracted twice with in each case 40 ml of diethyl ether. The combined organic phases were dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. The crude product was purified by flash chromatography (IR-50SI, petroleum ether/ethyl acetate 12-20%). Yield: 407 mg (purity 90%, 55% of theory) the mixture was cooled in an ice bath The aqueous phase was extracted twice with in each case 40 ml of diethyl ether The combined organic phases were dried (sodium sulphate) filtered concentrated under reduced pressure dried The crude product was purified by flash chromatography (IR-50SI, petroleum ether/ethyl acetate 12-20%)

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

Procedure: 36 ml of aqueous potassium hydroxide solution (6M) were added to a solution of 3.5 g (16.9 mmol) of 2-bromo-4-chlorophenol in 36 ml of acetonitrile, the mixture was cooled in an ice bath and 6.5 ml (26.9 mmol, 1.6 eq.) of difluoromethyl trifluormethanesulphonate [Angew. Chem. Int. Ed. 2013, 52, 1-5; Journal of Fluorine Chemistry 2009, 130, 667-670] were added dropwise with vigorous stirring. The reaction mixture was stirred for 5 min and diluted with 200 ml of water. The aqueous phase was extracted twice with in each case 150 ml of diethyl ether. The combined organic phases were dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. The aqueous phase was once more extracted with diethyl ether. The organic phase was dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. Yield of the two combined residues: 3.4 g (80% of theory) the mixture was cooled in an ice bath The aqueous phase was extracted twice with in each case 150 ml of diethyl ether The combined organic phases were dried (sodium sulphate) filtered concentrated under reduced pressure dried The aqueous phase was once more extracted with diethyl ether The organic phase was dried (sodium sulphate) filtered concentrated under reduced pressure dried

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

Procedure: 4.8 ml of aqueous potassium hydroxide solution (6M) were added to a solution of 600 mg (purity 93%, 2.22 mmol) of 4-iodo-6-methoxypyridin-3-ol in 4.8 ml of acetonitrile, the mixture was cooled in an ice bath and 863 μl (purity 75%, 3.56 mmol, 1.6 eq.) of difluoromethyl trifluoromethanesulphonate [Angew. Chem. Int. Ed. 2013, 52, 1-5; Journal of Fluorine Chemistry 2009, 130, 667-670] were added with vigorous stirring. The reaction mixture was stirred for 2 min and diluted with 33 ml of water. The aqueous phase was extracted twice with in each case 40 ml of diethyl ether. The combined organic phases were dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. The crude product was purified by flash chromatography (IR-50SI, petroleum ether/ethyl acetate 12-20%). Yield: 407 mg (purity 90%, 55% of theory) the mixture was cooled in an ice bath The aqueous phase was extracted twice with in each case 40 ml of diethyl ether The combined organic phases were dried (sodium sulphate) filtered concentrated under reduced pressure dried The crude product was purified by flash chromatography (IR-50SI, petroleum ether/ethyl acetate 12-20%)

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

Procedure: 36 ml of aqueous potassium hydroxide solution (6M) were added to a solution of 3.5 g (16.9 mmol) of 2-bromo-4-chlorophenol in 36 ml of acetonitrile, the mixture was cooled in an ice bath and 6.5 ml (26.9 mmol, 1.6 eq.) of difluoromethyl trifluormethanesulphonate [Angew. Chem. Int. Ed. 2013, 52, 1-5; Journal of Fluorine Chemistry 2009, 130, 667-670] were added dropwise with vigorous stirring. The reaction mixture was stirred for 5 min and diluted with 200 ml of water. The aqueous phase was extracted twice with in each case 150 ml of diethyl ether. The combined organic phases were dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. The aqueous phase was once more extracted with diethyl ether. The organic phase was dried (sodium sulphate), filtered, concentrated under reduced pressure and dried. Yield of the two combined residues: 3.4 g (80% of theory) the mixture was cooled in an ice bath The aqueous phase was extracted twice with in each case 150 ml of diethyl ether The combined organic phases were dried (sodium sulphate) filtered concentrated under reduced pressure dried The aqueous phase was once more extracted with diethyl ether The organic phase was dried (sodium sulphate) filtered concentrated under reduced pressure dried