methyl 2-methyl-3-phenylpropanoate

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: n-Butyl lithium (1.49N, 28.3 ml, 42.2 mmol) was added dropwise to a solution of diisopropylamine (5.9 ml, 42.2 mmol) in 50 ml of anhydrous THF at -78° C. under argon atmosphere. After the mixture was stirred at -78° C. for 20 minutes, methyl 2-methyl-3-phenylpropionate (5.00 g, 28.1 mmol) was added dropwise. After the mixture was stirred at -78° C. for 30 minutes, a solution of methyl iodide (2.6 ml, 42.2 mmol) in HMPA (1.5 ml, 8.43 mmol) was added dropwise. The reaction mixture was further stirred at -78° C. for 2 hours, and 10 ml of an aqueous saturated solution of ammonium chloride was added. The mixture was extracted with ether (50 ml×4), and then, the combined ether layers were washed with water (50 ml) and brine (50 ml), dried over anhydrous sodium sulfate, and concentrated. This residue was distilled to give a colorless oil of methyl 2,2-dimethyl-3-phenylpropionate (1.8909 g, yield 51.7%, b.p. 127.5°-131° C./18 mmHg), which was assigned the structure by the following data: After the mixture was stirred at -78° C. for 30 minutes The reaction mixture was further stirred at -78° C. for 2 hours The mixture was extracted with ether (50 ml×4) the combined ether layers were washed with water (50 ml) and brine (50 ml) dried over anhydrous sodium sulfate concentrated This residue was distilled

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

実験手順: n-Butyl lithium (1.49N, 49.2 ml, 73.3 mmol) was added dropwise to a solution of diisopropylamine (10.3 ml, 73.3 mmol) in 100 ml of anhydrous THF at 0° C. under argon atmosphere. After the mixture was stirred at 0° C. for 20 minutes, 3-phenylpropionic acid (5.00 g, 33.3 mmol) was added dropwise. After the mixture was stirred at 0° C. for 10 minutes, HMPA (12.7 ml, 73.3 mmol) was added dropwise and the mixture was further stirred for 20 minutes. Methyl iodide (4.4 ml, 69.9 mmol) was added dropwise at 0° C. and the mixture was stirred at room temperature for 3 hours. The reaction mixture was diluted with an aqueous saturated solution of ammonium chloride and acidified to pH2 with concentrated hydrochloric acid. The mixture was extracted with ethyl acetate (50 ml×4). The combined ethyl acetate layers were washed with water (50 ml) and brine (50 ml), dried over anhydrous sodium sulfate, and concentrated. To a solution of this residue in 100 ml of ether was added dropwise 50 ml of a solution of diazomethane in ether at 0° C. After concentration, the residue was distilled to give a colorless oil of methyl 2-methyl-3-phenylpropionate (5.6383 g, yield 95.0%, b.p. 122.5°-124.5° C./18 mmHg), which was assigned the structure by the following data: After the mixture was stirred at 0° C. for 10 minutes the mixture was further stirred for 20 minutes the mixture was stirred at room temperature for 3 hours The mixture was extracted with ethyl acetate (50 ml×4) The combined ethyl acetate layers were washed with water (50 ml) and brine (50 ml) dried over anhydrous sodium sulfate concentrated To a solution of this residue in 100 ml of ether was added dropwise 50 ml of a solution of diazomethane in ether at 0° C After concentration the residue was distilled

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

実験手順: n-Butyl lithium (1.49N, 49.2 ml, 73.3 mmol) was added dropwise to a solution of diisopropylamine (10.3 ml, 73.3 mmol) in 100 ml of anhydrous THF at 0° C. under argon atmosphere. After the mixture was stirred at 0° C. for 20 minutes, 3-phenylpropionic acid (5.00 g, 33.3 mmol) was added dropwise. After the mixture was stirred at 0° C. for 10 minutes, HMPA (12.7 ml, 73.3 mmol) was added dropwise and the mixture was further stirred for 20 minutes. Methyl iodide (4.4 ml, 69.9 mmol) was added dropwise at 0° C. and the mixture was stirred at room temperature for 3 hours. The reaction mixture was diluted with an aqueous saturated solution of ammonium chloride and acidified to pH2 with concentrated hydrochloric acid. The mixture was extracted with ethyl acetate (50 ml×4). The combined ethyl acetate layers were washed with water (50 ml) and brine (50 ml), dried over anhydrous sodium sulfate, and concentrated. To a solution of this residue in 100 ml of ether was added dropwise 50 ml of a solution of diazomethane in ether at 0° C. After concentration, the residue was distilled to give a colorless oil of methyl 2-methyl-3-phenylpropionate (5.6383 g, yield 95.0%, b.p. 122.5°-124.5° C./18 mmHg), which was assigned the structure by the following data: After the mixture was stirred at 0° C. for 10 minutes the mixture was further stirred for 20 minutes the mixture was stirred at room temperature for 3 hours The mixture was extracted with ethyl acetate (50 ml×4) The combined ethyl acetate layers were washed with water (50 ml) and brine (50 ml) dried over anhydrous sodium sulfate concentrated To a solution of this residue in 100 ml of ether was added dropwise 50 ml of a solution of diazomethane in ether at 0° C After concentration the residue was distilled

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:0.00; pressure:0.00; stir:

反応条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: n-Butyl lithium (1.49N, 28.3 ml, 42.2 mmol) was added dropwise to a solution of diisopropylamine (5.9 ml, 42.2 mmol) in 50 ml of anhydrous THF at -78° C. under argon atmosphere. After the mixture was stirred at -78° C. for 20 minutes, methyl 2-methyl-3-phenylpropionate (5.00 g, 28.1 mmol) was added dropwise. After the mixture was stirred at -78° C. for 30 minutes, a solution of methyl iodide (2.6 ml, 42.2 mmol) in HMPA (1.5 ml, 8.43 mmol) was added dropwise. The reaction mixture was further stirred at -78° C. for 2 hours, and 10 ml of an aqueous saturated solution of ammonium chloride was added. The mixture was extracted with ether (50 ml×4), and then, the combined ether layers were washed with water (50 ml) and brine (50 ml), dried over anhydrous sodium sulfate, and concentrated. This residue was distilled to give a colorless oil of methyl 2,2-dimethyl-3-phenylpropionate (1.8909 g, yield 51.7%, b.p. 127.5°-131° C./18 mmHg), which was assigned the structure by the following data: After the mixture was stirred at -78° C. for 30 minutes The reaction mixture was further stirred at -78° C. for 2 hours The mixture was extracted with ether (50 ml×4) the combined ether layers were washed with water (50 ml) and brine (50 ml) dried over anhydrous sodium sulfate concentrated This residue was distilled

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

実験手順: n-Butyl lithium (1.49N, 49.2 ml, 73.3 mmol) was added dropwise to a solution of diisopropylamine (10.3 ml, 73.3 mmol) in 100 ml of anhydrous THF at 0° C. under argon atmosphere. After the mixture was stirred at 0° C. for 20 minutes, 3-phenylpropionic acid (5.00 g, 33.3 mmol) was added dropwise. After the mixture was stirred at 0° C. for 10 minutes, HMPA (12.7 ml, 73.3 mmol) was added dropwise and the mixture was further stirred for 20 minutes. Methyl iodide (4.4 ml, 69.9 mmol) was added dropwise at 0° C. and the mixture was stirred at room temperature for 3 hours. The reaction mixture was diluted with an aqueous saturated solution of ammonium chloride and acidified to pH2 with concentrated hydrochloric acid. The mixture was extracted with ethyl acetate (50 ml×4). The combined ethyl acetate layers were washed with water (50 ml) and brine (50 ml), dried over anhydrous sodium sulfate, and concentrated. To a solution of this residue in 100 ml of ether was added dropwise 50 ml of a solution of diazomethane in ether at 0° C. After concentration, the residue was distilled to give a colorless oil of methyl 2-methyl-3-phenylpropionate (5.6383 g, yield 95.0%, b.p. 122.5°-124.5° C./18 mmHg), which was assigned the structure by the following data: After the mixture was stirred at 0° C. for 10 minutes the mixture was further stirred for 20 minutes the mixture was stirred at room temperature for 3 hours The mixture was extracted with ethyl acetate (50 ml×4) The combined ethyl acetate layers were washed with water (50 ml) and brine (50 ml) dried over anhydrous sodium sulfate concentrated To a solution of this residue in 100 ml of ether was added dropwise 50 ml of a solution of diazomethane in ether at 0° C After concentration the residue was distilled