2-amino-4,4,4-trifluorobutan-1-ol

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: At RT, 0.38 ml of 50% strength aqueous potassium carbonate solution (1.7 mmol, 0.68 equivalents) and 0.54 ml of benzyl chloroformate (3.8 mmol, 1.5 equivalents) were added to 400 mg of rac-2-amino-4,4,4-trifluorobutan-1-ol (Example 144A, 2.5 mmol, purity about 90%, 1 equivalent) in 36 ml of 1,4-dioxane, and the mixture was stirred at RT for 2 h. Another 0.11 ml of benzyl chloroformate (0.76 mmol, 0.3 equivalents) and 0.08 ml of 50% strength aqueous potassium carbonate solution (0.35 mmol, 0.14 equivalents) were then added, and the mixture was stirred at RT for a further 30 min. After concentration under reduced pressure, the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The crude product obtained was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted with ethyl acetate and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 490 mg (70% of theory) of the title compound. the mixture was stirred at RT for a further 30 min After concentration under reduced pressure the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA)

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

Procedure: 12.9 ml of 2 M lithium borohydride solution in THF (25.8 mmol, 2.5 equivalents) were initially charged in 20 ml of THF, 6.5 ml of chlorotrimethylsilane (51.1 mmol, 5 equivalents) were added and the mixture was stirred at RT for 5 min. 2.0 g of rac-2-amino-4,4,4-trifluorobutanoic acid hydrochloride (10.3 mmol, 1 equivalent) were then added a little at a time, and the mixture was stirred at RT overnight. 20.4 ml of methanol were then added dropwise, and after the addition had ended the mixture was concentrated. 12 ml of a 20% strength aqueous potassium hydroxide solution were added to the residue, and the mixture was extracted three times with dichloromethane. The combined organic solutions were dried over sodium sulphate, filtered and concentrated. This gave 1.58 g (96% of theory; purity 90%) of the title compound. the mixture was stirred at RT overnight after the addition was concentrated 12 ml of a 20% strength aqueous potassium hydroxide solution were added to the residue the mixture was extracted three times with dichloromethane The combined organic solutions were dried over sodium sulphate filtered concentrated

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

Procedure: At RT, 0.38 ml of 50% strength aqueous potassium carbonate solution (1.7 mmol, 0.68 equivalents) and 0.54 ml of benzyl chloroformate (3.8 mmol, 1.5 equivalents) were added to 400 mg of rac-2-amino-4,4,4-trifluorobutan-1-ol (Example 144A, 2.5 mmol, purity about 90%, 1 equivalent) in 36 ml of 1,4-dioxane, and the mixture was stirred at RT for 2 h. Another 0.11 ml of benzyl chloroformate (0.76 mmol, 0.3 equivalents) and 0.08 ml of 50% strength aqueous potassium carbonate solution (0.35 mmol, 0.14 equivalents) were then added, and the mixture was stirred at RT for a further 30 min. After concentration under reduced pressure, the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). The crude product obtained was taken up in ethyl acetate and washed twice with saturated aqueous sodium bicarbonate solution. The aqueous phase was extracted with ethyl acetate and the combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 490 mg (70% of theory) of the title compound. the mixture was stirred at RT for a further 30 min After concentration under reduced pressure the product was purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA)

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

Procedure: 0.32 ml of lithium borohydride (2 M in THF, 0.65 mmol, 2.5 equivalents) were initially charged in 0.5 ml of abs. THF, 0.16 ml of chlorotrimethylsilane (1.28 mmol, 5 equivalents) were added at RT and the mixture was stirred at RT for 5 min. 50 mg of 2-amino-4,4,4-trifluorobutanoic acid hydrochloride (0.26 mmol, 1 equivalent) were then added a little at a time, and the reaction mixture was stirred at RT overnight. 0.5 ml of methanol was added, and the mixture was then concentrated. 0.6 ml of a 20% strength solution of potassium hydroxide was then added, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 33 mg of the title compound (88% of theory). the reaction mixture was stirred at RT overnight the mixture was then concentrated 0.6 ml of a 20% strength solution of potassium hydroxide was then added the mixture was extracted three times with dichloromethane The combined organic phases were dried over sodium sulphate filtered concentrated

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

Procedure: 0.32 ml of lithium borohydride (2 M in THF, 0.65 mmol, 2.5 equivalents) were initially charged in 0.5 ml of abs. THF, 0.16 ml of chlorotrimethylsilane (1.28 mmol, 5 equivalents) were added at RT and the mixture was stirred at RT for 5 min. 50 mg of 2-amino-4,4,4-trifluorobutanoic acid hydrochloride (0.26 mmol, 1 equivalent) were then added a little at a time, and the reaction mixture was stirred at RT overnight. 0.5 ml of methanol was added, and the mixture was then concentrated. 0.6 ml of a 20% strength solution of potassium hydroxide was then added, and the mixture was extracted three times with dichloromethane. The combined organic phases were dried over sodium sulphate, filtered and concentrated. This gave 33 mg of the title compound (88% of theory). the reaction mixture was stirred at RT overnight the mixture was then concentrated 0.6 ml of a 20% strength solution of potassium hydroxide was then added the mixture was extracted three times with dichloromethane The combined organic phases were dried over sodium sulphate filtered concentrated

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-amino-4,4,4-trifluoro-butan-1-ol (0.161 g, 1. 12 mmol) in dry CH2Cl2 (4 mL) at 25° C. under nitrogen was added dropwise Et3N (0.17 mL, 1.23 mmol) followed also by dropwise addition of 5-chlorothiophene-2-sulfonyl chloride (0.243 g, 1.12 mmol) as a solution in dichloromethane (1 mL). The reaction was stirred for 18 h at 25° C. The reaction was then quenched by pouring it into a separatory funnel containing saturated NaHCO3 solution. Additional CH2Cl2 (15 mL) was added. After extraction, the organic layer was washed with 1N HCl solution, distilled water and brine. The organic phase was then dried over MgSO4 and concentrated to a crude solid. After concentration, the crude product was purified by flash chromatography, eluent:hexane:EtOAc, 4:1 to 2:1, to obtain 5-chloro-(3,3,3-trifluoro-1-hydroxymethyl-propyl)-thiophene-2-sulfonamide as a clear oil that crystallized under vacuum (0.191 g, 53%). The reaction was then quenched by pouring it into a separatory funnel containing saturated NaHCO3 solution Additional CH2Cl2 (15 mL) was added After extraction the organic layer was washed with 1N HCl solution distilled water and brine The organic phase was then dried over MgSO4 concentrated to a crude solid After concentration the crude product was purified by flash chromatography, eluent

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

Procedure: A solution of trimethylsilyl chloride (1.38 g, 12.73 mmol) was added to a solution of lithium borohydride (3.2 mL, 2.0 M in THF) and THF (5 mL) at 25° C. After stirring 5 min, 2-amino-4,4,4-trifluoro-butyric acid (0.50 g, 3. 18 mmol) was added portionwise over a 5 min period. The reaction was allowed to stir 48 h. The reaction was quenched by cautious addition of MeOH (5 mL) dropwise. The solvent was evaporated and the residue treated with potassium hydroxide (KOH) solution (20%, 6 mL). The aqueous phase was extracted using dichloromethane, 3 times (10 mL each). The organic phases were combined and dried over anhydrous sodium sulfate. After filtration the solvent was evaporated to afford the 2-amino-4,4,4-trifluoro-butan-1-ol as an oil (0.174 g, 38%). This oil was used directly in the next reaction without further purification. to stir 48 h The reaction was quenched by cautious addition of MeOH (5 mL) dropwise The solvent was evaporated the residue treated with potassium hydroxide (KOH) solution (20%, 6 mL) The aqueous phase was extracted dried over anhydrous sodium sulfate After filtration the solvent was evaporated

Conditions: temp:25.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 2-amino-4,4,4-trifluoro-butan-1-ol (0.161 g, 1.12 mmol) in dry CH2Cl2 (4 mL) at 25° C. under nitrogen was added dropwise Et3N (0.17 mL, 1.23 mmol) followed also by dropwise addition of 5-chlorothiophene-2-sulfonyl chloride (0.243 g, 1.12 mmol) as a solution in dichloromethane (1 mL). The reaction was stirred for 18 h at 25° C. The reaction was then quenched by pouring it into a separatory funnel containing saturated NaHCO3 solution. Additional CH2Cl2 (15 mL) was added. After extraction, the organic layer washed with 1N HCl solution, distilled water and brine. The organic phase was then dried over MgSO4 and concentrated to a crude solid. After concentration, the crude product was purified by flash chromatography, eluent:hexane:EtOAc, 4:1 to 2:1, to obtain 5-chloro-(3,3,3-trifluoro-1-hydroxymethyl-propyl)-thiophene-2-sulfonamide as a clear oil that crystallized under vacuum (0.191 g, 53%). The reaction was then quenched by pouring it into a separatory funnel containing saturated NaHCO3 solution Additional CH2Cl2 (15 mL) was added After extraction the organic layer washed with 1N HCl solution distilled water and brine The organic phase was then dried over MgSO4 concentrated to a crude solid After concentration the crude product was purified by flash chromatography, eluent

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

Procedure: A solution of trimethylsilyl chloride (1.38 g, 12.73 mmol) was added to a solution of lithium borohydride (3.2 mL, 2.0 M in THF) and THF (5 mL) at 25° C. After stirring 5 min, 2-amino-4,4,4-trifluoro-butyric acid (0.50 g, 3.18 mmol) was added portionwise over a 5 min period. The reaction was allowed to stir 48 h. The reaction was quenched by cautious addition of MeOH (5 mL) dropwise. The solvent was evaporated and the residue treated with potassium hydroxide (KOH) solution (20%, 6 mL). The aqueous phase was extracted using dichloromethane, 3 times (10 mL each). The organic phases were combined and dried over anhydrous sodium sulfate. After filtration the solvent was evaporated to afford the 2-amino-4,4,4-trifluoro-butan-1-ol as an oil (0.174 g, 38%). This oil was used directly in the next reaction without further purification. to stir 48 h The reaction was quenched by cautious addition of MeOH (5 mL) dropwise The solvent was evaporated the residue treated with potassium hydroxide (KOH) solution (20%, 6 mL) The aqueous phase was extracted dried over anhydrous sodium sulfate After filtration the solvent was evaporated

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

Procedure: 50 mg (0.16 mmol) of 8-[(2,6-difluorobenzyl)oxy]-2-methylimidazo[1,2-a]pyridine-3-carboxylic acid, 55 mg (0.17 mmol) of (benzotriazol-1-yloxy)bisdimethylaminomethylium fluoroborate (TBTU) and 79 mg (0.79 mmol) of 4-methylmorpholine were initially charged in 1.0 ml of dichloromethane. After 10 min at RT, 28 mg (0.17 mmol) of 2-amino-4,4,4-trifluorobutan-1-ol were added and the mixture was stirred at room temperature overnight. 1 ml of DMF and 50 mg (0.39 mmol) of 2-amino-4,4,4-trifluorobutan-1-ol were then added, and the mixture was stirred at 50° C. for 8 h. Another 50 mg (0.39 mmol) of 2-amino-4,4,4-trifluorobutan-1-ol were added, and the mixture was stirred in a microwave at 80° C. for 0.5 h. Another 50 mg (0.39 mmol) of 2-amino-4,4,4-trifluorobutan-1-ol were then added, and the mixture was stirred in a microwave at 80° C. for 1 h. The reaction solution was concentrated and purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA). All product-containing fractions were combined and concentrated. The residue was dissolved in dichloromethane and washed with saturated aqueous sodium bicarbonate solution. This gave 17 mg of the target compound (25% of theory, purity 100%). the mixture was stirred at 50° C. for 8 h the mixture was stirred in a microwave at 80° C. for 0.5 h the mixture was stirred in a microwave at 80° C. for 1 h The reaction solution was concentrated purified by preparative HPLC (RP18 column, mobile phase: acetonitrile/water gradient with addition of 0.1% TFA) concentrated The residue was dissolved in dichloromethane washed with saturated aqueous sodium bicarbonate solution