2-(5-Bromo-2-chlorophenyl)propan-2-ol

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-bromo-2-chloro-benzoic acid methyl ester (5 g) in diethyl ether (200 mL) cooled to −70° C. is added 3 M methylmagnesium bromide in THF (20 mL) dropwisely. The solution is stirred at −78° C. for 2 h and allowed to warm to room temperature for 16 hours. The solution is cooled to 0° C. and 1 N HCl (100 mL) is added dropwisely. The mixture is extracted with EtOAc (2×150 mL). The combined organic layer is washed with brine, dried over sodium sulfate, filtered and evaporated in vacuo. The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane to afford 2-(5 bromo-2-chloro-phenyl)-propan-2-ol (4.56 g). MS: 250 (M+H); 1H NMR (300 MHz, CDCl3) □7.8 (m, 1H); 7.5 (m, 1H); 7.2 (m, 1H); 4.4 (s, 1H); 1.6 (s, 6H). to warm to room temperature for 16 hours The solution is cooled to 0° C. The mixture is extracted with EtOAc (2×150 mL) The combined organic layer is washed with brine dried over sodium sulfate filtered evaporated in vacuo The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane

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

Procedure: To a solution of 2-(5-bromo-2-chlorophenyl)-propan-2-ol (500 mg, 2 mmol, 1 eq) in toluene (5 ml) was added a catalytic amount of p-toluenesulfonic acid (38 mg, 0.2 mmol, 0.1 eq) and the solution was refluxed under a Dean-Stark H2O separator overnight. The reaction mixture was allowed to cool to RT and was diluted with ether. The mixture was washed with sat. NaHCO3-solution and brine, dried (MgSO4), filtered and concentrated in vacuo to give the desired product (357 mg, 77%) as a colorless oil which did not require further purification. The mixture was washed with sat. NaHCO3-solution and brine dried (MgSO4) filtered concentrated in vacuo

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-bromo-2-chloro-benzoic acid methyl ester (5 g) in diethyl ether (200 mL) cooled to −70° C. is added 3 M methylmagnesium bromide in THF (20 mL) dropwisely. The solution is stirred at −78° C. for 2 h and allowed to warm to room temperature for 16 hours. The solution is cooled to 0° C. and 1 N HCl (100 mL) is added dropwisely. The mixture is extracted with EtOAc (2×150 mL). The combined organic layer is washed with brine, dried over sodium sulfate, filtered and evaporated in vacuo. The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane to afford 2-(5 bromo-2-chloro-phenyl)-propan-2-ol (4.56 g). MS: 250 (M+H); 1H NMR (300 MHz, CDCl3) □7.8 (m, 1H); 7.5 (m, 1H); 7.2 (m, 1H); 4.4 (s, 1H); 1.6 (s, 6H). to warm to room temperature for 16 hours The solution is cooled to 0° C. The mixture is extracted with EtOAc (2×150 mL) The combined organic layer is washed with brine dried over sodium sulfate filtered evaporated in vacuo The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane

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

Procedure: To a solution of 2-(5-bromo-2-chlorophenyl)-propan-2-ol (500 mg, 2 mmol, 1 eq) in toluene (5 ml) was added a catalytic amount of p-toluenesulfonic acid (38 mg, 0.2 mmol, 0.1 eq) and the solution was refluxed under a Dean-Stark H2O separator overnight. The reaction mixture was allowed to cool to RT and was diluted with ether. The mixture was washed with sat. NaHCO3-solution and brine, dried (MgSO4), filtered and concentrated in vacuo to give the desired product (357 mg, 77%) as a colorless oil which did not require further purification. The mixture was washed with sat. NaHCO3-solution and brine dried (MgSO4) filtered concentrated in vacuo

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-bromo-2-chloro-benzoic acid methyl ester (5 g) in diethyl ether (200 mL) cooled to −70° C. is added 3 M methylmagnesium bromide in THF (20 mL) dropwisely. The solution is stirred at −78° C. for 2 h and allowed to warm to room temperature for 16 hours. The solution is cooled to 0° C. and 1 N HCl (100 mL) is added dropwisely. The mixture is extracted with EtOAc (2×150 mL). The combined organic layer is washed with brine, dried over sodium sulfate, filtered and evaporated in vacuo. The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane to afford 2-(5-bromo-2-chloro-phenyl)-propan-2-ol (4.56 g). MS: 250 (M+H); 1H NMR (300 MHz, CDCl3) □7.8 (m, 1H); 7.5 (m, 1H); 7.2 (m, 1H); 4.4 (s, 1H); 1.6 (s, 6H). to warm to room temperature for 16 hours The solution is cooled to 0° C. The mixture is extracted with EtOAc (2×150 mL) The combined organic layer is washed with brine dried over sodium sulfate filtered evaporated in vacuo The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane

Conditions: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: To a solution of 5-bromo-2-chloro-benzoic acid methyl ester (5 g) in diethyl ether (200 mL) cooled to −70° C. is added 3 M methylmagnesium bromide in THF (20 mL) dropwisely. The solution is stirred at −78° C. for 2 h and allowed to warm to room temperature for 16 hours. The solution is cooled to 0° C. and 1 N HCl (100 mL) is added dropwisely. The mixture is extracted with EtOAc (2×150 mL). The combined organic layer is washed with brine, dried over sodium sulfate, filtered and evaporated in vacuo. The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane to afford 2-(5 bromo-2-chloro-phenyl)-propan-2-ol (4.56 g). MS: 250 (M+H); 1H NMR (300 MHz, CDCl3) □7.8 (m, 1H); 7.5 (m, 1H); 7.2 (m, 1H); 4.4 (s, 1H); 1.6 (s, 6H). to warm to room temperature for 16 hours The solution is cooled to 0° C. The mixture is extracted with EtOAc (2×150 mL) The combined organic layer is washed with brine dried over sodium sulfate filtered evaporated in vacuo The residue is chromatographed on silica gel eluting with 20% EtOAc in heptane

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

Procedure: To a solution of 2-(5-bromo-2-chlorophenyl)-propan-2-ol (500 mg, 2 mmol, 1 eq) in toluene (5 ml) was added a catalytic amount of p-toluenesulfonic acid (38 mg, 0.2 mmol, 0.1 eq) and the solution was refluxed under a Dean-Stark H2O separator overnight. The reaction mixture was allowed to cool to RT and was diluted with ether. The mixture was washed with sat. NaHCO3-solution and brine, dried (MgSO4), filtered and concentrated in vacuo to give the desired product (357 mg, 77%) as a colorless oil which did not require further purification. The mixture was washed with sat. NaHCO3-solution and brine dried (MgSO4) filtered concentrated in vacuo