2,4,6-三氟苯乙酸甲酯

反应条件: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a commercially obtained tetrahydrofuran solution of lithium bis(trimethyl-silyl)amide (1.0 M, 21.0 mL) stirred under a nitrogen atmosphere and cooled to an internal temperature of −65° C., was added dropwise over 30 minutes a solution of methyl 2,4,6-trifluorobenzeneacetate (i.e. the product of Step A) (2.04 g, 10.0 mmol) dissolved in dry tetrahydrofuran (10 mL). The reaction mixture was stirred for an additional 30 minutes, and then while maintaining the −65° C. temperature, a solution of freshly distilled acetyl chloride (0.80 mL, 11 mmol) in dry tetrahydrofuran (3 mL) was added dropwise. The reaction mixture was allowed to warm slowly to ambient temperature, and then water (30 mL) was added. The resultant mixture was extracted with ethyl acetate (60 mL). The aqueous phase was acidified with 1 N hydrochloric acid and extracted with ethyl acetate (60 mL). Only the first ethyl acetate extract was retained, because thin layer chromatographic analysis showed the second extract to contain apparent polar impurities besides additional desired product. The first ethyl acetate extract was further sequentially washed with 1 N hydrochloric acid, water and brine, dried (MgSO4), and concentrated to provide the title compound as a clear oil (1.86 g). while maintaining the −65° C. temperature to warm slowly to ambient temperature The resultant mixture was extracted with ethyl acetate (60 mL) extracted with ethyl acetate (60 mL) Only the first ethyl acetate extract extract The first ethyl acetate extract was further sequentially washed with 1 N hydrochloric acid, water and brine dried (MgSO4) concentrated

反应条件: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a commercially obtained tetrahydrofuran solution of lithium bis(trimethyl-silyl)amide (1.0 M, 21.0 mL) stirred under a nitrogen atmosphere and cooled to an internal temperature of −65° C., was added dropwise over 30 minutes a solution of methyl 2,4,6-trifluorobenzeneacetate (i.e. the product of Step A) (2.04 g, 10.0 mmol) dissolved in dry tetrahydrofuran (10 mL). The reaction mixture was stirred for an additional 30 minutes, and then while maintaining the −65° C. temperature, a solution of freshly distilled acetyl chloride (0.80 mL, 11 mmol) in dry tetrahydrofuran (3 mL) was added dropwise. The reaction mixture was allowed to warm slowly to ambient temperature, and then water (30 mL) was added. The resultant mixture was extracted with ethyl acetate (60 mL). The aqueous phase was acidified with 1 N hydrochloric acid and extracted with ethyl acetate (60 mL). Only the first ethyl acetate extract was retained, because thin layer chromatographic analysis showed the second extract to contain apparent polar impurities besides additional desired product. The first ethyl acetate extract was further sequentially washed with 1 N hydrochloric acid, water and brine, dried (MgSO4), and concentrated to provide the title compound as a clear oil (1.86 g). while maintaining the −65° C. temperature to warm slowly to ambient temperature The resultant mixture was extracted with ethyl acetate (60 mL) extracted with ethyl acetate (60 mL) Only the first ethyl acetate extract extract The first ethyl acetate extract was further sequentially washed with 1 N hydrochloric acid, water and brine dried (MgSO4) concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,4,6-trifluorobenzeneacetic acid (5.00 g, 26.3 mmol) in methanol (25 mL) was stirred at ambient temperature, and thionyl chloride (6 mL, ˜3 eq.) was added dropwise, causing the temperature of the reaction mixture to reach 60° C. The reaction mixture was allowed to cool to ambient temperature and was stirred for 3 h. Water (25 mL) was added with ice cooling. The mixture was extracted with ethyl acetate (2×100 mL). The combined organic phases were sequentially washed with water (2×), saturated aqueous sodium bicarbonate solution and brine, and then dried (MgSO4). Concentration provided the title compound as a clear oil (5.38 g). to reach 60° C The mixture was extracted with ethyl acetate (2×100 mL) The combined organic phases were sequentially washed with water (2×), saturated aqueous sodium bicarbonate solution and brine dried (MgSO4) Concentration

反应条件: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a commercially obtained tetrahydrofuran solution of lithium bis(trimethyl-silyl)amide (1.0 M, 21.0 mL), stirred under a nitrogen atmosphere and cooled to an internal temperature of −65° C., was added dropwise over 30 minutes a solution of methyl 2,4,6-trifluorobenzeneacetate (i.e. the product of Step A) (2.04 g, 10.0 mmol) dissolved in dry tetrahydrofuran (10 mL). The reaction mixture was stirred for an additional 30 minutes, and then while maintaining the −65° C. temperature, a solution of freshly distilled acetyl chloride (0.80 mL, 11 mmol) in dry tetrahydrofuran (3 mL) was added dropwise. The reaction mixture was allowed to warm slowly to ambient temperature, and then water (30 mL) was added. The resultant mixture was extracted with ethyl acetate (60 mL). The aqueous phase was acidified with 1 N hydrochloric acid and extracted with ethyl acetate (60 mL). Only the first extract was retained, because thin layer chromatographic analysis showed the second extract to contain apparent polar impurities besides additional desired product. The initial organic phase was further washed with 1 N hydrochloric acid, water and brine, dried over MgSO4, and concentrated to provide the title product as a clear oil (1.86 g). while maintaining the −65° C. temperature to warm slowly to ambient temperature The resultant mixture was extracted with ethyl acetate (60 mL) extracted with ethyl acetate (60 mL) Only the first extract extract The initial organic phase was further washed with 1 N hydrochloric acid, water and brine dried over MgSO4 concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,4,6-trifluorobenzeneacetic acid (5.00 g, 26.3 mmol) in methanol (25 mL) was stirred at ambient temperature, and thionyl chloride (6 mL, ˜3 eq.) was added dropwise, causing the temperature of the reaction mixture to reach 60° C. The reaction mixture was allowed to cool to ambient temperature and was stirred for 3 h. Water (25 mL) was added with ice cooling. The mixture was extracted with ethyl acetate (2×100 mL). The combined organic phases were washed with water (2×), with saturated aqueous sodium bicarbonate solution and with brine, and dried over MgSO4. Concentration provided the title product as a clear oil (5.38 g). to reach 60° C The mixture was extracted with ethyl acetate (2×100 mL) The combined organic phases were washed with water (2×), with saturated aqueous sodium bicarbonate solution and with brine dried over MgSO4 Concentration

反应条件: temp:-65.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a commercially obtained tetrahydrofuran solution of lithium bis(trimethyl-silyl)amide (1.0 M, 21.0 mL) stirred under a nitrogen atmosphere and cooled to an internal temperature of −65° C., was added dropwise over 30 minutes a solution of methyl 2,4,6-trifluorobenzeneacetate (i.e. the product of Step A) (2.04 g, 10.0 mmol) dissolved in dry tetrahydrofuran (10 mL). The reaction mixture was stirred for an additional 30 minutes, and then while maintaining the −65° C. temperature, a solution of freshly distilled acetyl chloride (0.80 mL, 11 mmol) in dry tetrahydrofuran (3 mL) was added dropwise. The reaction mixture was allowed to warm slowly to ambient temperature, and then water (30 mL) was added. The resultant mixture was extracted with ethyl acetate (60 mL). The aqueous phase was acidified with 1 N hydrochloric acid and extracted with ethyl acetate (60 mL). Only the first ethyl acetate extract was retained, because thin layer chromatographic analysis showed the second extract to contain apparent polar impurities besides additional desired product. The first ethyl acetate extract was further sequentially washed with 1 N hydrochloric acid, water and brine, dried (MgSO4), and concentrated to provide the title compound as a clear oil (1.86 g). while maintaining the −65° C. temperature to warm slowly to ambient temperature The resultant mixture was extracted with ethyl acetate (60 mL) extracted with ethyl acetate (60 mL) Only the first ethyl acetate extract extract The first ethyl acetate extract was further sequentially washed with 1 N hydrochloric acid, water and brine dried (MgSO4) concentrated

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of 2,4,6-trifluorobenzeneacetic acid (5.00 g, 26.3 mmol) in methanol (25 mL) was stirred at ambient temperature, and thionyl chloride (6 mL, ˜3 eq.) was added dropwise, causing the temperature of the reaction mixture to reach 60° C. The reaction mixture was allowed to cool to ambient temperature and was stirred for 3 h. Water (25 mL) was added with ice cooling. The mixture was extracted with ethyl acetate (2×100 mL). The combined organic phases were sequentially washed with water (2×), saturated aqueous sodium bicarbonate solution and brine, and then dried (MgSO4). Concentration provided the title compound as a clear oil (5.38 g). to reach 60° C The mixture was extracted with ethyl acetate (2×100 mL) The combined organic phases were sequentially washed with water (2×), saturated aqueous sodium bicarbonate solution and brine dried (MgSO4) Concentration