2,2,3,3-tetrafluoropropyl trifluoromethanesulfonate

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

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

Procedure: A solution of 5-hydroxy-pyridine-2-carboxylic acid methyl ester (2.0 g, 13.1 mmol) in acetone (40 ml) was treated with potassium carbonate (5.415 g, 39.2 mmol) and trifluoro-methanesulphonic acid 2,2,3,3-tetrafluoropropyl ester. After 4 hours stirring at room temperature the suspension was diluted with diethylether. After filtration the solution was evaporated and the yellow solid purified by chromatography on silica gel using a gradient of heptane/ethyl acetate=100:0 to 30:70 as the eluent. The 5-(2,2,3,3-tetrafluoro-propoxy)-pyridine-2-carboxylic acid methyl ester was obtained as a light yellow solid (3.49 g, 76% of theory). MS (ISP): m/z=468.1 [M+H]+. After filtration the solution was evaporated the yellow solid purified by chromatography on silica gel using a gradient of heptane/ethyl acetate=100:0 to 30:70 as the eluent

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

Procedure: Using 1.0 g of (4-chlorobenzyl)malononitrile, 15 ml of N,N-dimethylformamide, 0.073 g of cesium carbonate, and 1.47 g of 2,2,3,3-tetrafluoropropyl trifluoromethanesulfonate, and according to the process described in the Production Example 1, there was obtained 0.12 g of 2-(4-chlorobenzyl)-2-(2,2,3,3-tetrafluoropropyl)malononitrile (the present compound (25)).

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

Procedure: 6-Chloro-5-fluoro-pyridin-3-ol (300 mg, 2.03 mmol) is dissolved in DMF (10 mL). Potassium carbonate (562 mg, 4.07 mmol) is added followed by 2,2,3,3-tetrafluoropropyl trifluoromethanesulfonate (591 mg, 2.24 mmol) (For preparation of this reagent, see US2013/143900, Ex 1). The reaction is stirred at room temperature for 18 hours then allowed to stand at room temperature for 4 days. The reaction is diluted with aqueous NaHCO3 and ethyl acetate. The layers are separated and the aqueous layer is extracted with ethyl acetate (2×). The combined organic layers are washed with brine and concentrated. The crude material is purified via silica gel chromatography using a 0-10% ethyl acetate/hexanes gradient to give the title compound (440 mg, 83%). ES/MS (m/e): 262.0 (M+1). For preparation of this reagent to stand at room temperature for 4 days The layers are separated the aqueous layer is extracted with ethyl acetate (2×) The combined organic layers are washed with brine concentrated The crude material is purified via silica gel chromatography

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

Procedure: Methyl 5-hydroxypyridine-2-carboxylate (0.903 g, 5.90 mmol) is suspended in acetone (7 mL) and DMF (7 mL). 325 Mesh potassium carbonate (2.44 g, 17.69 mmol) is added in one portion and stirred at room temperature for 1.5 hours under nitrogen. 2,2,3,3-Tetrafluoropropyl trifluoromethanesulfonate (2.02 g, 7.67 mmol) is added drop wise and the mixture is stirred for 2 hours. The reaction mixture is diluted with ethyl acetate and saturated NH4Cl and extracted with ethyl acetate (3 times). The combined organic extracts are washed with brine, dried over Na2SO4, filtered, and the solvent removed in vacuo. The crude product is purified by silica gel flash chromatography, eluting with a gradient of 0-20% ethyl acetate in dichloromethane to give the title compound (1.047 g, 66%). ES/MS (m/e): 268.0 (M+1). the mixture is stirred for 2 hours extracted with ethyl acetate (3 times) The combined organic extracts are washed with brine dried over Na2SO4 filtered the solvent removed in vacuo The crude product is purified by silica gel flash chromatography eluting with a gradient of 0-20% ethyl acetate in dichloromethane

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

Procedure: Methyl 5-hydroxypyridine-2-carboxylate (0.903 g, 5.90 mmol) is suspended in acetone (7 mL) and DMF (7 mL). 325 Mesh potassium carbonate (2.44 g, 17.69 mmol) is added in one portion and stirred at room temperature for 1.5 hours under nitrogen. 2,2,3,3-Tetrafluoropropyl trifluoromethanesulfonate (2.02 g, 7.67 mmol) is added drop wise and the mixture is stirred for 2 hours. The reaction mixture is diluted with ethyl acetate and saturated NH4Cl and extracted with ethyl acetate (3 times). The combined organic extracts are washed with brine, dried over Na2SO4, filtered, and the solvent removed in vacuo. The crude product is purified by silica gel flash chromatography, eluting with a gradient of 0-20% ethyl acetate in dichloromethane to give the title compound (1.047 g, 66%). ES/MS (m/e): 268.0 (M+1). the mixture is stirred for 2 hours extracted with ethyl acetate (3 times) The combined organic extracts are washed with brine dried over Na2SO4 filtered the solvent removed in vacuo The crude product is purified by silica gel flash chromatography eluting with a gradient of 0-20% ethyl acetate in dichloromethane

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

Procedure: A solution of 5-hydroxy-pyridine-2-carboxylic acid methyl ester (2.0 g, 13.1 mmol) in acetone (40 ml) was treated with potassium carbonate (5.415 g, 39.2 mmol) and trifluoro-methanesulphonic acid 2,2,3,3-tetrafluoropropyl ester. After 4 hours stirring at room temperature the suspension was diluted with diethylether. After filtration the solution was evaporated and the yellow solid purified by chromatography on silica gel using a gradient of heptane/ethyl acetate=100:0 to 30:70 as the eluent. The 5-(2,2,3,3-tetrafluoro-propoxy)-pyridine-2-carboxylic acid methyl ester was obtained as a light yellow solid (3.49 g, 76% of theory). MS (ISP): m/z=468.1 [M+H]+. After filtration the solution was evaporated the yellow solid purified by chromatography on silica gel using a gradient of heptane/ethyl acetate=100:0 to 30:70 as the eluent

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

Procedure: A solution of 5-hydroxy-pyridine-2-carboxylic acid methyl ester (2.0 g, 13.1 mmol) in acetone (40 ml) was treated with potassium carbonate (5.415 g, 39.2 mmol) and trifluoro-methanesulphonic acid 2,2,3,3-tetrafluoropropyl ester. After 4 hours stirring at room temperature the suspension was diluted with diethylether. After filtration the solution was evaporated and the yellow solid purified by chromatography on silica gel using a gradient of heptane/ethyl acetate=100:0 to 30:70 as the eluent. The 5-(2,2,3,3-tetrafluoro-propoxy)-pyridine-2-carboxylic acid methyl ester was obtained as a light yellow solid (3.49 g, 76% of theory). MS (ISP): m/z=468.1 [M+H]+. After filtration the solution was evaporated the yellow solid purified by chromatography on silica gel using a gradient of heptane/ethyl acetate=100:0 to 30:70 as the eluent

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

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

Procedure: 2,2,3,3-tetrafluoropropan-1-ol (244.3 g, 1.85 mol, obtained from Sinochem Corp.), triethylamine (187.2 g, 1.85 mol, obtained from Aldrich Chemical Co.) and 500 mL of chloroform were combined in a 2-liter Parr pressure reactor and sealed. The reactor temperature was set to −10° C. Trifluoromethanesulfonyl fluoride (281.33 g, 1.85 mol, obtained from 3M Company) was added at such a rate that the temperature did not exceed −5° C. Once the addition was complete, the mix was held at −10° C. for 45 minutes. The reaction mix was then emptied and washed with 2×500 mL portions of water and 1×250 mL portion of 1N HCl. GC analysis of the reaction mixture indicated a 97 percent conversion to the product. The chloroform solvent was removed by rotary evaporation. The product was dried over anhydrous magnesium sulfate which was then filtered from the product. sealed was set to −10° C did not exceed −5° C Once the addition The reaction mix washed with 2×500 mL portions of water and 1×250 mL portion of 1N HCl The chloroform solvent was removed by rotary evaporation The product was dried over anhydrous magnesium sulfate which was then filtered from the product

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

Procedure: 2,2,3,3-tetrafluoropropan-1-ol (244.3 g, 1.85 mol, obtained from Sinochem Corp.), triethylamine (187.2 g, 1.85 mol, obtained from Aldrich Chemical Co.) and 500 mL of chloroform were combined in a 2-liter Parr pressure reactor and sealed. The reactor temperature was set to −10° C. Trifluoromethanesulfonyl fluoride (281.33 g, 1.85 mol, obtained from 3M Company) was added at such a rate that the temperature did not exceed −5° C. Once the addition was complete, the mix was held at −10° C. for 45 minutes. The reaction mix was then emptied and washed with 2×500 mL portions of water and 1×250 mL portion of 1N HCl. GC analysis of the reaction mixture indicated a 97 percent conversion to the product. The chloroform solvent was removed by rotary evaporation. The product was dried over anhydrous magnesium sulfate which was then filtered from the product. sealed was set to −10° C did not exceed −5° C Once the addition The reaction mix washed with 2×500 mL portions of water and 1×250 mL portion of 1N HCl The chloroform solvent was removed by rotary evaporation The product was dried over anhydrous magnesium sulfate which was then filtered from the product

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

Procedure: In the same manner as in Reference Example 150, ethyl 6-ethyl-1-methyl-4-oxo-5-(2-oxo-2-phenylethyl)-3-(2,2,3,3-tetrafluoropropoxy)-4,5-dihydro-1H-pyrrolo[3,2-c]pyridine-2-carboxylate (460 mg, 93%) was obtained as a gray powder from the compound of Reference Example 40 (382 mg, 1.00 mmol), 2,2,3,3-tetrafluoropropyl trifluoromethanesulfonate (913 mg, 3.46 mmol), cesium carbonate (391 mg, 1.20 mmol) and DMF (10 mL). The title compound (310 mg, 95%) was obtained as a gray powder from the thus-obtained ethyl 6-ethyl-1-methyl-4-oxo-5-(2-oxo-2-phenylethyl)-3-(2,2,3,3-tetrafluoropropoxy)-4,5-dihydro-1H-pyrrolo[3,2-c]pyridine-2-carboxylate (348 mg, 0.70 mmol) by a method similar to that in Reference Example 59.