3,3-difluorocyclobutan-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: 1.0 g of Methyl 4-fluoro-3-nitrobenzoate, 1.6 g of 3,3-Difluoro-cyclobutanol, and 3.3 g of Cs2CO3 were stirred in 10 ml of anhydrous DMF for 7 h at 60° C. The reaction mixture was then poured into 100 ml of water and extracted three times using 30 ml of EA each. The organic layer was dried using MgSO4 and volatiles were evaporated to yield 1.4 g of the title compound that was used without further purification. extracted three times The organic layer was dried were evaporated

Conditions: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 370 mg of methyl 4-fluoro-5-methanesulfonyl-2-methylbenzoate, 297 mg of 3,3-difluorocyclobutanol and 1.47 g of Cs2CO3 were dissolved in 10 ml of anhydrous NMP and stirred at 60° C. for 4 h. The reaction mixture was then diluted with 125 ml of a 50% concentrated aqueous NaHCO3 solution and extracted 3 times with 100 ml of EA each time. It was dried over Na2SO4, and the solvent was removed in vacuo. Chromatography on silica gel with DIP resulted in 380 mg of a colorless oil. extracted 3 times with 100 ml of EA each time It was dried over Na2SO4 the solvent was removed in vacuo

Conditions: temp:70.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 4-(2,4-dichloro-7-((2-(trimethylsilyl)ethoxy)methyl)-7H-pyrrolo[2,3-d]pyrimidin-5-yl)-N-methylbenzamide (1 equiv), 3,3-difluorocyclobutan-1-ol (1.1 equiv), and sodium tert-butoxide (1.2 equiv) in 1,4-dioxane (0.22 M) were combined in a sealable flask. The reaction mixture was put under a nitrogen atmosphere, the sealable flask was sealed, and the mixture was stirred at 70° C. for 16 h. The mixture was cooled to room temperature and concentrated to afford an oil, which was suspended in DCM and purified using silica gel chromatography (0-50% ethyl acetate in hexane) to afford the title product (64.1% yield) as a clear oil. MS (ESI) m/z 523.4 [M+1]+. the sealable flask was sealed The mixture was cooled to room temperature concentrated to afford an oil, which purified

Conditions: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A 250-mL round-bottom flask was charged with 3,3-difluorocyclobutan-1-ol (2.41 g, 22.3 mmol), 1,2-dichloroethane (50 mL), N,N-diisopropylethyl amine (3.5 mL, 20 mmol) and triphosgene (1.33 g, 4.48 mmol). The resulting solution stirred 30 minutes at 50° C., and then a solution of (S)-1-(6-bromo-2-methyl-3,4-dihydroquinoxaline-1(2H)-yl)ethan-1-one (600 mg, 2.23 mmol) and N,N-diisopropylethyl amine (3.5 mL, 20 mmol) in 1,2-dichloroethane (30 mL) was added. The resulting solution stirred overnight at 50° C. After cooling to room temperature, the reaction mixture was concentrated under vacuum. The residue was dissolved in ethyl acetate (50 mL), washed with saturated sodium carbonate solution (2×50 mL), dried over anhydrous sodium sulfate and concentrated under vacuum. The residue was purified via column chromatography on silica gel (eluting with 2:3, ethyl acetate/petroleum ether) to afford 3,3-difluorocyclobutyl (S)-4-acetyl-7-bromo-3-methyl-3,4-dihydroquinoxaline-1(2H)-carboxylate (800 mg, 89%) as a brown solid. MS (ESI, pos. ion) m/z 404, 405 [M+1]+. The resulting solution stirred overnight at 50° C After cooling to room temperature the reaction mixture was concentrated under vacuum The residue was dissolved in ethyl acetate (50 mL) washed with saturated sodium carbonate solution (2×50 mL) dried over anhydrous sodium sulfate concentrated under vacuum The residue was purified via column chromatography on silica gel (eluting with 2:3, ethyl acetate/petroleum ether)

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

Procedure: 1.0 g of Methyl 4-fluoro-3-nitrobenzoate, 1.6 g of 3,3-Difluoro-cyclobutanol, and 3.3 g of Cs2CO3 were stirred in 10 ml of anhydrous DMF for 7 h at 60° C. The reaction mixture was then poured into 100 ml of water and extracted three times using 30 ml of EA each. The organic layer was dried using MgSO4 and volatiles were evaporated to yield 1.4 g of the title compound that was used without further purification. extracted three times The organic layer was dried were evaporated