3,3,3-trifluoroprop-1-en-2-ylboronic acid

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

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

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: 5-bromo-1,3-dimethyl-2-nitrobenzene (10.0 g), [1-(trifluoromethyl)vinyl]boronic acid (purity: 60%, 13.4 g) and potassium carbonate (14.4 g) was dissolved in the mixed solvent of THF and water, which was then degassed three times. To the solution was added dichloro bis(triphenylphosphine)palladium (II) (1.5 g), and the mixture was heated to reflux for 3 hours under argon atmosphere. The mixture was cooled to room temperature and then poured into water, which was then extracted twice with ethyl acetate. The organic layer was combined, which was then washed with water and dried over anhydrous magnesium sulfate. After the drying agent was filtered off, the solvent was distilled away under the reduced pressure, and the residue was then purified by silica gel chromatography to yield 1,3-dimethyl-2-nitro-5-[1-(trifluoromethyl)vinyl]benzene (11.2 g). 1H-NMR (CDCl3) δ: 2.34 (6H, s), 5.78-5.80 (1H, m), 6.03-6.04 (1H, m), 7.20 (2H, s). was then degassed three times To the solution was added dichloro bis(triphenylphosphine)palladium (II) (1.5 g) the mixture was heated to reflux for 3 hours under argon atmosphere poured into water, which was then extracted twice with ethyl acetate which was then washed with water dried over anhydrous magnesium sulfate After the drying agent was filtered off the solvent was distilled away under the reduced pressure the residue was then purified by silica gel chromatography

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

Procedure: 5-bromo-1,3-dimethyl-2-nitrobenzene (10.0 g), [1-(trifluoromethyl)vinyl]boronic acid (purity: 60%, 13.4 g) and potassium carbonate (14.4 g) was dissolved in the mixed solvent of THF and water, which was then degassed three times. To the solution was added dichloro bis(triphenylphosphine)palladium (II) (1.5 g), and the mixture was heated to reflux for 3 hours under argon atmosphere. The mixture was cooled to room temperature and then poured into water, which was then extracted twice with ethyl acetate. The organic layer was combined, which was then washed with water and dried over anhydrous magnesium sulfate. After the drying agent was filtered off, the solvent was distilled away under the reduced pressure, and the residue was then purified by silica gel chromatography to yield 1,3-dimethyl-2-nitro-5-[1-(trifluoromethyl)vinyl]benzene (11.2 g). 1H-NMR (CDCl3) δ: 2.34 (6H, s), 5.78-5.80 (1H, m), 6.03-6.04 (1H, m), 7.20 (2H, s). was then degassed three times To the solution was added dichloro bis(triphenylphosphine)palladium (II) (1.5 g) the mixture was heated to reflux for 3 hours under argon atmosphere poured into water, which was then extracted twice with ethyl acetate which was then washed with water dried over anhydrous magnesium sulfate After the drying agent was filtered off the solvent was distilled away under the reduced pressure the residue was then purified by silica gel chromatography

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

Procedure: To magnesium turnings (5.83 g, 0.24 mol) in tetrahydrofuran (400 ml) was added dropwise trimethyl borate (68.13 ml, 0.6 mol). The reaction mixture was cooled to 0° C. and 2-bromo-3,3,3-trifluoropropene (20.75 ml, 0.2 mol) was added dropwise. The reaction mixture was then allowed to warm to room temperature and stirred under nitrogen overnight. The reaction mixture was again cooled to 0° C. and hydrochloric acid (5M, 200 ml) was added dropwise, ensuring that the temperature of the solution remained below 10° C. The reaction mixture was then stirred under nitrogen for 48 h. To the reaction mixture was added diethyl ether (100 ml) and water (200 ml) to give two phases. The aqueous layer was separated and extracted with diethyl ether (100 ml). The combined organic phases were washed with water (100 ml), dried (MgSO4) and concentrated in vacuo. To the residue was added cyclohexane (50 ml), resulting in precipitate formation. The precipitate was isolated by decanting the solution, washed with cyclohexane, and dried in vacuo to give Preparation 59 (2.62 g, 0.02 mol) as a white solid. to warm to room temperature The reaction mixture was again cooled to 0° C. remained below 10° C The reaction mixture was then stirred under nitrogen for 48 h to give two phases The aqueous layer was separated extracted with diethyl ether (100 ml) The combined organic phases were washed with water (100 ml) dried (MgSO4) concentrated in vacuo To the residue was added cyclohexane (50 ml) resulting in precipitate formation The precipitate was isolated by decanting the solution washed with cyclohexane dried in vacuo to give

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

Procedure: To magnesium turnings (5.83 g, 0.24 mol) in tetrahydrofuran (400 ml) was added dropwise trimethyl borate (68.13 ml, 0.6 mol). The reaction mixture was cooled to 0° C. and 2-bromo-3,3,3-trifluoropropene (20.75 ml, 0.2 mol) was added dropwise. The reaction mixture was then allowed to warm to room temperature and stirred under nitrogen overnight. The reaction mixture was again cooled to 0° C. and hydrochloric acid (5M, 200 ml) was added dropwise, ensuring that the temperature of the solution remained below 10° C. The reaction mixture was then stirred under nitrogen for 48 h. To the reaction mixture was added diethyl ether (100 ml) and water (200 ml) to give two phases. The aqueous layer was separated and extracted with diethyl ether (100 ml). The combined organic phases were washed with water (100 ml), dried (MgSO4) and concentrated in vacuo. To the residue was added cyclohexane (50 ml), resulting in precipitate formation. The precipitate was isolated by decanting the solution, washed with cyclohexane, and dried in vacuo to give Preparation 59 (2.62 g, 0.02 mol) as a white solid. to warm to room temperature The reaction mixture was again cooled to 0° C. remained below 10° C The reaction mixture was then stirred under nitrogen for 48 h to give two phases The aqueous layer was separated extracted with diethyl ether (100 ml) The combined organic phases were washed with water (100 ml) dried (MgSO4) concentrated in vacuo To the residue was added cyclohexane (50 ml) resulting in precipitate formation The precipitate was isolated by decanting the solution washed with cyclohexane dried in vacuo to give

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

Procedure: To magnesium turnings (5.83 g, 0.24 mol) in tetrahydrofuran (400 ml) was added dropwise trimethyl borate (68.13 ml, 0.6 mol). The reaction mixture was cooled to 0° C. and 2-bromo-3,3,3-trifluoropropene (20.75 ml, 0.2 mol) was added dropwise. The reaction mixture was then allowed to warm to room temperature and stirred under nitrogen overnight. The reaction mixture was again cooled to 0° C. and hydrochloric acid (5M, 200 ml) was added dropwise, ensuring that the temperature of the solution remained below 10° C. The reaction mixture was then stirred under nitrogen for 48 h. To the reaction mixture was added diethyl ether (100 ml) and water (200 ml) to give two phases. The aqueous layer was separated and extracted with diethyl ether (100 ml). The combined organic phases were washed with water (100 ml), dried (MgSO4) and concentrated in vacua. To the residue was added cyclohexane (50 ml), resulting in precipitate formation. The precipitate was isolated by decanting the solution, washed with cyclohexane, and dried in vacuo to give Preparation 59 (2.62 g, 0.02 mol) as a white solid. to warm to room temperature The reaction mixture was again cooled to 0° C. remained below 10° C The reaction mixture was then stirred under nitrogen for 48 h to give two phases The aqueous layer was separated extracted with diethyl ether (100 ml) The combined organic phases were washed with water (100 ml) dried (MgSO4) concentrated in vacua To the residue was added cyclohexane (50 ml) resulting in precipitate formation The precipitate was isolated by decanting the solution washed with cyclohexane dried in vacuo to give

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

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

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

Procedure: To magnesium turnings (5.83 g, 0.24 mol) in tetrahydrofuran (400 ml) was added dropwise trimethyl borate (68.13 ml, 0.6 mol). The reaction mixture was cooled to 0° C. and 2-bromo-3,3,3-trifluoropropene (20.75 ml, 0.2 mol) was added dropwise. The reaction mixture was then allowed to warm to room temperature and stirred under nitrogen overnight. The reaction mixture was again cooled to 0 □C and hydrochloric acid (5M, 200 ml) was added dropwise, ensuring that the temperature of the solution remained below 10 □C. The reaction mixture was then stirred under nitrogen for 48 h. To the reaction mixture was added diethyl ether (100 ml) and water (200 ml) to give two phases. The aqueous layer was separated and extracted with diethyl ether (100 ml). The combined organic phases were washed with water (100 ml), dried (MgSO4) and concentrated in vacuo. To the residue was added cyclohexane (50 ml), resulting in precipitate formation. The precipitate was isolated by decanting the solution, washed with cyclohexane, and dried in vacuo to give Preparation 59 (2.62 g, 0.02 mol) as a white solid. to warm to room temperature was added dropwise The reaction mixture was then stirred under nitrogen for 48 h to give two phases The aqueous layer was separated extracted with diethyl ether (100 ml) The combined organic phases were washed with water (100 ml) dried (MgSO4) concentrated in vacuo To the residue was added cyclohexane (50 ml) resulting in precipitate formation The precipitate was isolated by decanting the solution washed with cyclohexane dried in vacuo to give