ethyl 4,4,5,5-tetrafluoro-3-oxopentanoate

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 4,4,5,5-tetrafluoro-3-oxo-pentanoate (25.7 g, 0.119 mmol) was dissolved in toluene (260 ml) and cooled to 0° C. Sodium borohydride (5.4 g, 0.143 g) was added portionwise, and the mixture was allowed to reach room temperature overnight with stirring. The mixture was then cooled to 0° C. and acidified with 1 m HCl. The phases were separated, the aqueous phase was extracted two times with ethyl acetate, the combined organic phases were dried over magnesium sulfate and the solvent was removed under reduced pressure. The residue was dissolved in a minimum amount of methanol, the resulting solution was evaporated to dryness under reduced pressure to yield 22.9 g of a residue (0.105 mol, 88%) that were used directly in the next step. The mixture was then cooled to 0° C. The phases were separated the aqueous phase was extracted two times with ethyl acetate the combined organic phases were dried over magnesium sulfate the solvent was removed under reduced pressure The residue was dissolved in a minimum amount of methanol the resulting solution was evaporated to dryness under reduced pressure

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

Procedure: Lithium hexamethyldisilazide (250 ml of a 1M solution in THF, 0.25 mol) was cooled in an argon atmosphere to −78° C. and ethyl acetate (23 ml, 0.26 mol) was added dropwise with stirring. Stirring was continued for one hour at −78° C., then methyl 2,2,3,3-tetrafluoropropionate (22 g, 0.137 mol) was added dropwise with stirring. Stirring was continued for three hours at −78° C., then a saturated solution of ammonium chloride (175 ml) was added dropwise. The mixture was allowed to reach room temperature overnight. The mixture was acidified with 1M HCl, the phases were separated. The aqueous phase was extracted with ethyl acetate, the combined organic phases were washed two times with 1M HCl, brine, dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by vacuum distillation to yield 25.7 g (0.119 mmol, 87%) of a colourless liquid that was used directly in the next step. Stirring with stirring Stirring was continued for three hours at −78° C. to reach room temperature overnight the phases were separated The aqueous phase was extracted with ethyl acetate the combined organic phases were washed two times with 1M HCl, brine dried over sodium sulfate The solvent was removed under reduced pressure the residue was purified by vacuum distillation

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 4,4,5,5-tetrafluoro-3-oxo-pentanoate (25.7 g, 0.119 mol) was dissolved in toluene (260 ml) and cooled to 0° C. Sodium borohydride (5.4 g, 0.143 mol) was added portionwise, and the mixture was allowed to reach room temperature overnight with stirring. The mixture was then cooled to 0° C. and acidified with 1M HCl. The phases were separated, the aqueous phase was extracted two times with ethyl acetate, the combined organic phases were dried over magnesium sulfate and the solvent was reduced under reduced pressure. The residue was dissolved in a minimum amount of methanol and evaporated to dryness under reduced pressure to yield 22.9 g (0.105 mol, 88%) that were used directly in the next step. The mixture was then cooled to 0° C. The phases were separated the aqueous phase was extracted two times with ethyl acetate the combined organic phases were dried over magnesium sulfate The residue was dissolved in a minimum amount of methanol evaporated to dryness under reduced pressure to yield 22.9 g (0.105 mol, 88%) that

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

Procedure: Lithium hexamethyldisilazide (250 ml of a 1M solution in THF, 0.25 mol) was cooled in an argon atmosphere to −78° C. and ethyl acetate (23 ml, 0.26 mol) was added dropwise with stirring. Stirring was continued for one hour at −78° C., then methyl 2,2,3,3-tetrafluoropropionate (22 g, 0.137 mol) was added dropwise with stirring. Stirring was continued for three hours at −78° C., then a saturated solution of ammonium chloride (175 ml) was added dropwise. The mixture was allowed to reach room temperature overnight. The mixture was acidified with 1M HCl, the phases were separated. The aqueous phase was extracted with ethyl acetate, the combined organic phases were washed two times with 1M HCl, brine, dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by vacuum distillation to yield 25.7 g (0.119 mmol, 87%) of a colourless liquid that was used directly in the next step. Stirring with stirring Stirring was continued for three hours at −78° C. to reach room temperature overnight the phases were separated The aqueous phase was extracted with ethyl acetate the combined organic phases were washed two times with 1M HCl, brine dried over sodium sulfate The solvent was removed under reduced pressure the residue was purified by vacuum distillation

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 4,4,5,5-tetrafluoro-3-oxo-pentanoate (25.7 g, 0.119 mmol) was dissolved in toluene (260 ml) and cooled to 0° C. Sodium borohydride (5.4 g, 0.143 g) was added portionwise, and the mixture was allowed to reach room temperature overnight with stirring. The mixture was then cooled to 0° C. and acidified with 1 m HCl. The phases were separated, the aqueous phase was extracted two times with ethyl acetate, the combined organic phases were dried over magnesium sulfate and the solvent was removed under reduced pressure. The residue was dissolved in a minimum amount of methanol, the resulting solution was evaporated to dryness under reduced pressure to yield 22.9 g of a residue (0.105 mol, 88%) that were used directly in the next step. The mixture was then cooled to 0° C. The phases were separated the aqueous phase was extracted two times with ethyl acetate the combined organic phases were dried over magnesium sulfate the solvent was removed under reduced pressure The residue was dissolved in a minimum amount of methanol the resulting solution was evaporated to dryness under reduced pressure

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

Procedure: Lithium hexamethyldisilazide (250 ml of a 1M solution in THF, 0.25 mol) was cooled in an argon atmosphere to −78° C. and ethyl acetate (23 ml, 0.26 mol) was added dropwise with stirring. Stirring was continued for one hour at −78° C., then methyl 2,2,3,3-tetrafluoropropionate (22 g, 0.137 mol) was added dropwise with stirring. Stirring was continued for three hours at −78° C., then a saturated solution of ammonium chloride (175 ml) was added dropwise. The mixture was allowed to reach room temperature overnight. The mixture was acidified with 1M HCl, the phases were separated. The aqueous phase was extracted with ethyl acetate, the combined organic phases were washed two times with 1M HCl, brine, dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by vacuum distillation to yield 25.7 g (0.119 mmol, 87%) of a colourless liquid that was used directly in the next step. Stirring with stirring Stirring was continued for three hours at −78° C. to reach room temperature overnight the phases were separated The aqueous phase was extracted with ethyl acetate the combined organic phases were washed two times with 1M HCl, brine dried over sodium sulfate The solvent was removed under reduced pressure the residue was purified by vacuum distillation

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 4,4,5,5-tetrafluoro-3-oxo-pentanoate (25.7 g, 0.119 mmol) was dissolved in toluene (260 ml) and cooled to 0° C. Sodium borohydride (5.4 g, 0.143 g) was added portionwise, and the mixture was allowed to reach room temperature overnight with stirring. The mixture was then cooled to 0° C. and acidified with 1 m HCl. The phases were separated, the aqueous phase was extracted two times with ethyl acetate, the combined organic phases were dried over magnesium sulfate and the solvent was removed under reduced pressure. The residue was dissolved in a minimum amount of methanol, the resulting solution was evaporated to dryness under reduced pressure to yield 22.9 g of a residue (0.105 mol, 88%) that were used directly in the next step. The mixture was then cooled to 0° C. The phases were separated the aqueous phase was extracted two times with ethyl acetate the combined organic phases were dried over magnesium sulfate the solvent was removed under reduced pressure The residue was dissolved in a minimum amount of methanol the resulting solution was evaporated to dryness under reduced pressure

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 4,4,5,5-tetrafluoro-3-oxo-pentanoate (25.7 g, 0.119 mol) was dissolved in toluene (260 ml) and cooled to 0° C. Sodium borohydride (5.4 g, 0.143 mol) was added portionwise, and the mixture was allowed to reach room temperature overnight with stirring. The mixture was then cooled to 0° C. and acidified with 1M HCl. The phases were separated, the aqueous phase was extracted two times with ethyl acetate, the combined organic phases were dried over magnesium sulfate and the solvent was reduced under reduced pressure. The residue was dissolved in a minimum amount of methanol and evaporated to dryness under reduced pressure to yield 22.9 g (0.105 mol, 88%) that were used directly in the next step. The mixture was then cooled to 0° C. The phases were separated the aqueous phase was extracted two times with ethyl acetate the combined organic phases were dried over magnesium sulfate The residue was dissolved in a minimum amount of methanol evaporated to dryness under reduced pressure to yield 22.9 g (0.105 mol, 88%) that

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

Procedure: Lithium hexamethyldisilazide (250 ml of a 1M solution in THF, 0.25 mol) was cooled in an argon atmosphere to −78° C. and ethyl acetate (23 ml, 0.26 mol) was added dropwise with stirring. Stirring was continued for one hour at −78° C., then methyl 2,2,3,3-tetrafluoropropionate (22 g, 0.137 mol) was added dropwise with stirring. Stirring was continued for three hours at −78° C., then a saturated solution of ammonium chloride (175 ml) was added dropwise. The mixture was allowed to reach room temperature overnight. The mixture was acidified with 1M HCl, the phases were separated. The aqueous phase was extracted with ethyl acetate, the combined organic phases were washed two times with 1M HCl, brine, dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by vacuum distillation to yield 25.7 g (0.119 mmol, 87%) of a colourless liquid that was used directly in the next step. Stirring with stirring Stirring was continued for three hours at −78° C. to reach room temperature overnight the phases were separated The aqueous phase was extracted with ethyl acetate the combined organic phases were washed two times with 1M HCl, brine dried over sodium sulfate The solvent was removed under reduced pressure the residue was purified by vacuum distillation

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

Procedure: Lithium hexamethyldisilazide (250 ml of a 1M solution in THF, 0.25 mol) was cooled in an argon atmosphere to −78° C. and ethyl acetate (23 ml, 0.26 mol) was added dropwise with stirring. Stirring was continued for one hour at −78° C., then methyl 2,2,3,3-tetrafluoropropionate (22 g, 0.137 mol) was added dropwise with stirring. Stirring was continued for three hours at −78° C., then a saturated solution of ammonium chloride (175 ml) was added dropwise. The mixture was allowed to reach room temperature overnight. The mixture was acidified with 1M HCl, the phases were separated. The aqueous phase was extracted with ethyl acetate, the combined organic phases were washed two times with 1M HCl, brine, dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by vacuum distillation to yield 25.7 g (0.119 mmol, 87%) of a colourless liquid that was used directly in the next step. Stirring with stirring Stirring was continued for three hours at −78° C. to reach room temperature overnight the phases were separated The aqueous phase was extracted with ethyl acetate the combined organic phases were washed two times with 1M HCl, brine dried over sodium sulfate The solvent was removed under reduced pressure the residue was purified by vacuum distillation

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Ethyl 4,4,5,5-tetrafluoro-3-oxo-pentanoate (25.7 g, 0.119 mmol) was dissolved in toluene (260 ml) and cooled to 0° C. Sodium borohydride (5.4 g, 0.143 g) was added portionwise, and the mixture was allowed to reach room temperature overnight with stirring. The mixture was then cooled to 0° C. and acidified with 1 m HCl. The phases were separated, the aqueous phase was extracted two times with ethyl acetate, the combined organic phases were dried over magnesium sulfate and the solvent was removed under reduced pressure. The residue was dissolved in a minimum amount of methanol, the resulting solution was evaporated to dryness under reduced pressure to yield 22.9 g of a residue (0.105 mol, 88%) that were used directly in the next step. The mixture was then cooled to 0° C. The phases were separated the aqueous phase was extracted two times with ethyl acetate the combined organic phases were dried over magnesium sulfate the solvent was removed under reduced pressure The residue was dissolved in a minimum amount of methanol the resulting solution was evaporated to dryness under reduced pressure

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

Procedure: Lithium hexamethyldisilazide (250 ml of a 1M solution in THF, 0.25 mol) was cooled in an argon atmosphere to −78° C. and ethyl acetate (23 ml, 0.26 mol) was added dropwise with stirring. Stirring was continued for one hour at −78° C., then methyl 2,2,3,3-tetrafluoropropionate (22 g, 0.137 mol) was added dropwise with stirring. Stirring was continued for three hours at −78° C., then a saturated solution of ammonium chloride (175 ml) was added dropwise. The mixture was allowed to reach room temperature overnight. The mixture was acidified with 1M HCl, the phases were separated. The aqueous phase was extracted with ethyl acetate, the combined organic phases were washed two times with 1M HCl, brine, dried over sodium sulfate. The solvent was removed under reduced pressure and the residue was purified by vacuum distillation to yield 25.7 g (0.119 mmol, 87%) of a colourless liquid that was used directly in the next step. Stirring with stirring Stirring was continued for three hours at −78° C. to reach room temperature overnight the phases were separated The aqueous phase was extracted with ethyl acetate the combined organic phases were washed two times with 1M HCl, brine dried over sodium sulfate The solvent was removed under reduced pressure the residue was purified by vacuum distillation