4-bromo-2-fluoro-1-(trifluoromethyl)benzene

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

Procedure: To a 250 mL round-bottomed flask was added 4-bromo-2-fluoro-1-(trifluoromethyl)benzene (12 mL, 50 mmol) and DMF (4.0 mL, 50 mmol). The solution was stirred at 0° C. and treated with sodium methoxide (4 g, 75 mmol). The reaction mixture was stirred at room temperature for 30 minutes and 60° C. for 2 hours. The resulting milky suspension was quenched with ice at 0° C. and the separated aqueous layer was extracted with EtOAc (3×50 mL). The combined organic layers were washed with saturated sodium chloride (1×25 mL), dried over Na2SO4, and concentrated to give the crude residue which was purified with flash column chromatography ((5%→20% EtOAc in hexane) to provide 4-bromo-2-methoxy-1-(trifluoromethyl)benzene (5.80 g, 46% yield) as a light yellow oil. m/z (%): 256.1.2 (100%, M++H). The reaction mixture was stirred at room temperature for 30 minutes and 60° C. for 2 hours The resulting milky suspension was quenched with ice at 0° C. the separated aqueous layer was extracted with EtOAc (3×50 mL) The combined organic layers were washed with saturated sodium chloride (1×25 mL) dried over Na2SO4 concentrated to give the crude residue which was purified with flash column chromatography ((5%→20% EtOAc in hexane)

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

Procedure: To a 250 mL round-bottomed flask was added 4-bromo-2-fluoro-1-(trifluoromethyl)benzene (12 mL, 50 mmol) and DMF (4.0 mL, 50 mmol). The solution was stirred at 0° C. and treated with sodium methoxide (4 g, 75 mmol). The reaction mixture was stirred at room temperature for 30 minutes and 60° C. for 2 hours. The resulting milky suspension was quenched with ice at 0° C. and the separated aqueous layer was extracted with EtOAc (3×50 mL). The combined organic layers were washed with saturated sodium chloride (1×25 mL), dried over Na2SO4, and concentrated to give the crude residue which was purified with flash column chromatography ((5%→20% EtOAc in hexane) to provide 4-bromo-2-methoxy-1-(trifluoromethyl)benzene (5.80 g, 46% yield) as a light yellow oil. m/z (%): 256.1.2 (100%, M++H). The reaction mixture was stirred at room temperature for 30 minutes and 60° C. for 2 hours The resulting milky suspension was quenched with ice at 0° C. the separated aqueous layer was extracted with EtOAc (3×50 mL) The combined organic layers were washed with saturated sodium chloride (1×25 mL) dried over Na2SO4 concentrated to give the crude residue which was purified with flash column chromatography ((5%→20% EtOAc in hexane)

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tert-butyl-1-piperazine-carboxylate (740 mg, 3.05 mmol) and 4-bromo-2-fluoro-1-trifluoromethyl-benzene (530 mg. 2.85 mmol) were dissolved in anhydrous toluene (6 mL, degassed). In a separate, septum-equipped vial were placed tri(dibenzylideneacetone)dipalladium (0) (152 mg, 0.17 mmol), 1,3-bis(2,6-di-1-propylphenyl)imidazolium chloride (283 mg, 0.67 mmol) and sodium t-butoxide (400 mg, 4.2 mmol). This “catalytic” vial was equipped with a magnetic stirbar and flushed with dry nitrogen. The reactant solution was next transferred to the “catalytic” vial and the mixture was stirred at 100° C. for 5 hours. After this period the mixture was combined with 20 mL of hexane/EtOAc (2:1) and was passed through a pad of Celite. The resulting filtrate was concentrated and purified using silica gel chromatography (0-20% EtOAc/Hexane) to yield 853 mg (86%) of 4-(3-Fluoro-4-trifluoromethyl-phenyl)-piperazine-1-carboxylic acid tert-butyl ester as a yellow residue. 1H NMR (400 MHz, CDCl3) δ 7.44-7.40 (m, 1H), 6.65-6.58 (m, 2H), 3.59-3.56 (m, 4H), 3.27-3.25 (m, 4H), 1.49 (s, 9H). In a separate, septum-equipped vial This “catalytic” vial was equipped with a magnetic stirbar flushed with dry nitrogen After this period the mixture was combined with 20 mL of hexane/EtOAc (2:1) The resulting filtrate was concentrated purified

Conditions: temp:100.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: Tert-butyl-1-piperazine-carboxylate (740 mg, 3.05 mmol) and 4-bromo-2-fluoro-1-trifluoromethyl-benzene (530 mg. 2.85 mmol) were dissolved in anhydrous toluene (6 mL, degassed). In a separate, septum-equipped vial were placed tri(dibenzylideneacetone)dipalladium (0) (152 mg, 0.17 mmol), 1,3-bis(2,6-di-1-propylphenyl)imidazolium chloride (283 mg, 0.67 mmol) and sodium t-butoxide (400 mg, 4.2 mmol). This “catalytic” vial was equipped with a magnetic stirbar and flushed with dry nitrogen. The reactant solution was next transferred to the “catalytic” vial and the mixture was stirred at 100° C. for 5 hours. After this period the mixture was combined with 20 mL of hexane/EtOAc (2:1) and was passed through a pad of Celite. The resulting filtrate was concentrated and purified using silica gel chromatography (0-20% EtOAc/Hexane) to yield 853 mg (86%) of 4-(3-Fluoro-4-trifluoromethyl-phenyl)-piperazine-1-carboxylic acid tert-butyl ester as a yellow residue. 1H NMR (400 MHz, CDCl3) δ 7.44-7.40 (m, 1H), 6.65-6.58 (m, 2H), 3.59-3.56 (m, 4H), 3.27-3.25 (m, 4H), 1.49 (s, 9H). In a separate, septum-equipped vial This “catalytic” vial was equipped with a magnetic stirbar flushed with dry nitrogen After this period the mixture was combined with 20 mL of hexane/EtOAc (2:1) The resulting filtrate was concentrated purified

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

Procedure: Obtained by starting from (S)-5-(tert-butyldimethylsilyloxy)-4-(3,6-dihydro-2H-pyran-4-yl)-2-isopropyl-7,7-dimethyl-5,6,7,8-tetrahydroquinoline-3-carbaldehyde and 4-bromo-2-fluoro-1-(trifluoromethyl)benzene. Diethylether is used instead of toluene. Obtained

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

Procedure: Obtained by starting from (S)-5-(tert-butyldimethylsilyloxy)-4-(3,6-dihydro-2H-pyran-4-yl)-2-isopropyl-7,7-dimethyl-5,6,7,8-tetrahydroquinoline-3-carbaldehyde and 4-bromo-2-fluoro-1-(trifluoromethyl)benzene. Diethylether is used instead of toluene. Obtained

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

Procedure: Obtained by starting from (S)-5-(tert-butyldimethylsilyloxy)-4-iodo-2-isopropyl-7,7-dimethyl-5,6,7,8-tetrahydroquinoline-3-carbaldehyde and 4-bromo-2-fluoro-benzotrifluoride. Obtained

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