1-(3-chloro-5-fluorophenyl)ethanone

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of (R)-MeCBS oxazaborolidine (2.9 ml, 1M solution in toluene) in dry tetrahydrofuran (5 ml) was added dropwise borane-THF complex (17.4 ml, 1M solution in tetrahydrofuran) under an argon atmosphere. The solution was cooled to 0° C. and 3′-chloro-5′-fluoroacetophenone (5.0 g) dissolved in dry tetrahydrofuran (5 ml) was added dropwise to the reaction mixture in 40 min. The reaction mixture was stirred for 1 h at 0° C. and was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml). After stirring the mixture for 5 min at 0° C., the cooling bath was removed and the white suspension was stirred at room temperature for 30 min. The suspension was filtered over celite and the filtrate was evaporated over silica gel for purification. Column chromatography (SiO2; heptane/EtOAc) afforded (S)-1-(3-chloro-5-fluoro-phenyl)-ethanol (4.50 g, 89%) as a colourless liquid. 1H NMR (300 MHz, CDCl3, δ): 1.48 (d, J=6.3 Hz, 3H), 1.92 (bs, 1H), 4.87 (q, J=6.6 Hz), 6.98 (m, 2H), 7.16 (s, 1H). was added dropwise to the reaction mixture in 40 min was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml) After stirring the mixture for 5 min at 0° C. the cooling bath was removed the white suspension was stirred at room temperature for 30 min The suspension was filtered over celite the filtrate was evaporated over silica gel for purification

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of (R)-MeCBS oxazaborolidine (2.9 ml, 1M solution in toluene) in dry tetrahydrofuran (5 ml) was added dropwise borane-THF complex (17.4 ml, 1M solution in tetrahydrofuran) under an argon atmosphere. The solution was cooled to 0° C. and 3′-chloro-5′-fluoroacetophenone (5.0 g) dissolved in dry tetrahydrofuran (5 ml) was added dropwise to the reaction mixture in 40 min. The reaction mixture was stirred for 1 h at 0° C. and was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml). After stirring the mixture for 5 min at 0° C., the cooling bath was removed and the white suspension was stirred at room temperature for 30 min. The suspension was filtered over celite and the filtrate was evaporated over silica gel for purification. Column chromatography (SiO2; heptane/EtOAc) afforded (S)-1-(3-chloro-5-fluoro-phenyl)-ethanol (4.50 g, 89%) as a colourless liquid. was added dropwise to the reaction mixture in 40 min was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml) After stirring the mixture for 5 min at 0° C. the cooling bath was removed the white suspension was stirred at room temperature for 30 min The suspension was filtered over celite the filtrate was evaporated over silica gel for purification

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of (R)-MeCBS oxazaborolidine (2.9 ml, 1M solution in toluene) in dry tetrahydrofuran (5 ml) was added dropwise borane-THF complex (17.4 ml, 1M solution in tetrahydrofuran) under an argon atmosphere. The solution was cooled to 0° C. and 3′-chloro-5′-fluoroacetophenone (5.0 g) dissolved in dry tetrahydrofuran (5 ml) was added dropwise to the reaction mixture in 40 min. The reaction mixture was stirred for 1 h at 0° C. and was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml). After stirring the mixture for 5 min at 0° C., the cooling bath was removed and the white suspension was stirred at room temperature for 30 min. The suspension was filtered over celite and the filtrate was evaporated over silica gel for purification. Column chromatography (SiO2; heptane/EtOAc) afforded (S)-1-(3-chloro-5-fluoro-phenyl)-ethanol (4.50 g, 89%) as a colourless liquid. was added dropwise to the reaction mixture in 40 min was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml) After stirring the mixture for 5 min at 0° C. the cooling bath was removed the white suspension was stirred at room temperature for 30 min The suspension was filtered over celite the filtrate was evaporated over silica gel for purification

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: (3-Chloro-5-fluorophenyl)(oxo)acetaldehyde (27 g, 84%) was prepared from 3-chloro-5-fluoro acetophenone (30.0 g, 174.4 mmol) and selenium dioxide (21.28 g, 191.8 mmol) according to the typical procedure used for Preparation 1. used for Preparation 1

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: (3-Chloro-5-fluorophenyl)(oxo)acetaldehyde (27 g, 84%) was prepared from 3-chloro-5-fluoro acetophenone (30.0 g, 174.4 mmol) and selenium dioxide (21.28 g, 191.8 mmol) according to the typical procedure used for Preparation 1. used for Preparation 1

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: (3-Chloro-5-fluorophenyl)(oxo)acetaldehyde (27 g, 84%) was prepared from 3-chloro-5-fluoro acetophenone (30.0 g, 174.4 mmol) and selenium dioxide (21.28 g, 191.8 mmol) according to the typical procedure used for Preparation 1. used for Preparation 1

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of (R)-MeCBS oxazaborolidine (2.9 ml, 1M solution in toluene) in dry tetrahydrofuran (5 ml) was added dropwise borane-THF complex (17.4 ml, 1M solution in tetrahydrofuran) under an argon atmosphere. The solution was cooled to 0° C. and 3′-chloro-5′-fluoroacetophenone (5.0 g) dissolved in dry tetrahydrofuran (5 ml) was added dropwise to the reaction mixture in 40 min. The reaction mixture was stirred for 1 h at 0° C. and was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml). After stirring the mixture for 5 min at 0° C., the cooling bath was removed and the white suspension was stirred at room temperature for 30 min. The suspension was filtered over celite and the filtrate was evaporated over silica gel for purification. Column chromatography (SiO2; heptane/EtOAc) afforded (S)-1-(3-chloro-5-fluoro-phenyl)-ethanol (4.50 g, 89%) as a colourless liquid. 1H NMR (300 MHz, CDCl3, δ): 1.48 (d, J=6.3 Hz, 3H), 1.92 (bs, 1H), 4.87 (q, J=6.6 Hz), 6.98 (m, 2H), 7.16 (s, 1H). was added dropwise to the reaction mixture in 40 min was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml) After stirring the mixture for 5 min at 0° C. the cooling bath was removed the white suspension was stirred at room temperature for 30 min The suspension was filtered over celite the filtrate was evaporated over silica gel for purification

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: (3-Chloro-5-fluorophenyl)(oxo)acetaldehyde (27 g, 84%) was prepared from 3-chloro-5-fluoro acetophenone (30.0 g, 174.4 mmol) and selenium dioxide (21.28 g, 191.8 mmol) according to the typical procedure used for Preparation 1. used for Preparation 1

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of (R)-MeCBS oxazaborolidine (2.9 ml, 1M solution in toluene) in dry tetrahydrofuran (5 ml) was added dropwise borane-THF complex (17.4 ml, 1M solution in tetrahydrofuran) under an argon atmosphere. The solution was cooled to 0° C. and 3′-chloro-5′-fluoroacetophenone (5.0 g) dissolved in dry tetrahydrofuran (5 ml) was added dropwise to the reaction mixture in 40 min. The reaction mixture was stirred for 1 h at 0° C. and was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml). After stirring the mixture for 5 min at 0° C., the cooling bath was removed and the white suspension was stirred at room temperature for 30 min. The suspension was filtered over celite and the filtrate was evaporated over silica gel for purification. Column chromatography (SiO2; heptane/EtOAc) afforded (S)-1-(3-chloro-5-fluoro-phenyl)-ethanol (4.50 g, 89%) as a colourless liquid. 1H NMR (300 MHz, CDCl3, δ): 1.48 (d, J=6.3 Hz, 3H), 1.92 (bs, 1H), 4.87 (q, J=6.6 Hz), 6.98 (m, 2H), 7.16 (s, 1H). was added dropwise to the reaction mixture in 40 min was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml) After stirring the mixture for 5 min at 0° C. the cooling bath was removed the white suspension was stirred at room temperature for 30 min The suspension was filtered over celite the filtrate was evaporated over silica gel for purification

反応条件: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: To a stirred solution of (R)-MeCBS oxazaborolidine (2.9 ml, 1M solution in toluene) in dry tetrahydrofuran (5 ml) was added dropwise borane-THF complex (17.4 ml, 1M solution in tetrahydrofuran) under an argon atmosphere. The solution was cooled to 0° C. and 3′-chloro-5′-fluoroacetophenone (5.0 g) dissolved in dry tetrahydrofuran (5 ml) was added dropwise to the reaction mixture in 40 min. The reaction mixture was stirred for 1 h at 0° C. and was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml). After stirring the mixture for 5 min at 0° C., the cooling bath was removed and the white suspension was stirred at room temperature for 30 min. The suspension was filtered over celite and the filtrate was evaporated over silica gel for purification. Column chromatography (SiO2; heptane/EtOAc) afforded (S)-1-(3-chloro-5-fluoro-phenyl)-ethanol (4.50 g, 89%) as a colourless liquid. was added dropwise to the reaction mixture in 40 min was slowly quenched with methanol (5 ml) followed by addition of HCl 4M in ethanol (1 ml) After stirring the mixture for 5 min at 0° C. the cooling bath was removed the white suspension was stirred at room temperature for 30 min The suspension was filtered over celite the filtrate was evaporated over silica gel for purification