methyl 2-methylhexanoate

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

実験手順: Escherichia coli MR-2103 (FERM BP-3835) was seeded on 50 ml of LB medium (1% polypeptone, 0.5% yeast extract, 0.5% NaCl) containing 50 μg/ml ampicillin and cultured at 37° C. for 20 hours under shaking. After the completion of the cultivation, the culture solution was centrifuged. The total volume of the cells harvested were washed with ion-exchanged water and then suspended in 50 ml of 50 mM phosphate buffer (pH 7.0). To this cell suspension, 5 g of racemic methyl α-methylhexanoate was added and reacted at 30° C. for 20 hours. During the reaction, the pH of the reaction solution was adjusted at 7.0 using in NaOH aqueous solution. After the completion of the reaction, cells were removed by centrifugation and unreacted methyl α-methylhexanoate was extracted with ethyl acetate. The organic layer was dehydrated by adding thereto anhydrous sodium sulfate and the solvent was removed by evaporation. The organic layer was further distilled and purified to thereby obtain 1.9 g of optically active methyl α-methylhexanoate. The specific rotation of this optically active methyl α-methylhexanoate was measured and found to be [α]25 D =+16.3. Then, after the pH of the aqueous layer was lowered to 2.0 with dilute sulfuric acid, the acid in the aqueous layer was extracted with ethyl acetate. The organic layer was dehydrated by adding thereto anhydrous sodium sulfate and the solvent was removed by evaporation. The organic layer was further distilled and purified to thereby obtain 1.3 g of optically active α-methylhexanoic acid. The specific rotation of this sample was measured and found to be [α]25 D =-16.3. the acid in the aqueous layer was extracted with ethyl acetate by adding anhydrous sodium sulfate and the solvent was removed by evaporation The organic layer was further distilled purified

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

実験手順: Escherichia coli MR-2103 (FERM BP-3835) was seeded on 50 ml of LB medium (1% polypeptone, 0.5% yeast extract, 0.5% NaCl) containing 50 μg/ml ampicillin and cultured at 37° C. for 20 hours under shaking. After the completion of the cultivation, the culture solution was centrifuged. The total volume of the cells harvested were washed with ion-exchanged water and then suspended in 50 ml of 50 mM phosphate buffer (pH 7.0). To this cell suspension, 5 g of racemic methyl α-methylhexanoate was added and reacted at 30° C. for 20 hours. During the reaction, the pH of the reaction solution was adjusted at 7.0 using in NaOH aqueous solution. After the completion of the reaction, cells were removed by centrifugation and unreacted methyl α-methylhexanoate was extracted with ethyl acetate. The organic layer was dehydrated by adding thereto anhydrous sodium sulfate and the solvent was removed by evaporation. The organic layer was further distilled and purified to thereby obtain 1.9 g of optically active methyl α-methylhexanoate. The specific rotation of this optically active methyl α-methylhexanoate was measured and found to be [α]25 D =+16.3. Then, after the pH of the aqueous layer was lowered to 2.0 with dilute sulfuric acid, the acid in the aqueous layer was extracted with ethyl acetate. The organic layer was dehydrated by adding thereto anhydrous sodium sulfate and the solvent was removed by evaporation. The organic layer was further distilled and purified to thereby obtain 1.3 g of optically active α-methylhexanoic acid. The specific rotation of this sample was measured and found to be [α]25 D =-16.3. the acid in the aqueous layer was extracted with ethyl acetate by adding anhydrous sodium sulfate and the solvent was removed by evaporation The organic layer was further distilled purified

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

実験手順: A solution of dimethyl methylphosphonate (60 g, 485 mmol) in 600 ml THF was cooled to −78° C. and treated with a 2.5 M solution n-butyl lithium in hexane (194 mL, 485 mmol). After 30 min, the reaction was treated with a solution of methyl 2-methylhexanoate (14 g, 97 mmol) in THF (40 mL). The reaction was stirred for 1 h at −78° C. The reaction was treated with a saturated aqueous ammonium chloride solution (200 mL) and allowed to warm to ambient temperature. The solution was diluted with water and extracted with ether. The combined organic layers were washed with brine, dried, and concentrated. Purification by normal phase chromatography using a gradient of ethyl acetate in hexane gave dimethyl (3-methyl-2-oxoheptyl)phosphonate. to warm to ambient temperature extracted with ether The combined organic layers were washed with brine dried concentrated Purification by normal phase chromatography

反応条件: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 2-methylhexanoic acid (20 g, 153 mmol) in methanol (500 mL) was treated with concentrated sulfuric acid (8.0 mL) and heated to 50° C. for 16 h. The reaction was diluted with water and extracted with ether. The combined organic layers were dried and concentrated to afford 20.57 g (93%) of methyl 2-methylhexanoate as a colorless liquid. extracted with ether The combined organic layers were dried concentrated

反応条件: temp:50.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: A solution of 2-methylhexanoic acid (20 g, 153 mmol) in methanol (500 mL) was treated with concentrated sulfuric acid (8.0 mL) and heated to 50° C. for 16 h. The reaction was diluted with water and extracted with ether. The combined organic layers were dried and concentrated to afford 20.57 g (93%) of methyl 2-methylhexanoate as a colorless liquid. extracted with ether The combined organic layers were dried concentrated

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

実験手順: Escherichia coli MR-2103 (FERM BP-3835) was seeded on 50 ml of LB medium (1% polypeptone, 0.5% yeast extract, 0.5% NaCl) containing 50 μg/ml ampicillin and cultured at 37° C. for 20 hours under shaking. After the completion of the cultivation, the culture solution was centrifuged. The total volume of the cells harvested were washed with ion-exchanged water and then suspended in 50 ml of 50 mM phosphate buffer (pH 7.0). To this cell suspension, 5 g of racemic methyl α-methylhexanoate was added and reacted at 30° C. for 20 hours. During the reaction, the pH of the reaction solution was adjusted at 7.0 using in NaOH aqueous solution. After the completion of the reaction, cells were removed by centrifugation and unreacted methyl α-methylhexanoate was extracted with ethyl acetate. The organic layer was dehydrated by adding thereto anhydrous sodium sulfate and the solvent was removed by evaporation. The organic layer was further distilled and purified to thereby obtain 1.9 g of optically active methyl α-methylhexanoate. The specific rotation of this optically active methyl α-methylhexanoate was measured and found to be [α]25 D =+16.3. Then, after the pH of the aqueous layer was lowered to 2.0 with dilute sulfuric acid, the acid in the aqueous layer was extracted with ethyl acetate. The organic layer was dehydrated by adding thereto anhydrous sodium sulfate and the solvent was removed by evaporation. The organic layer was further distilled and purified to thereby obtain 1.3 g of optically active α-methylhexanoic acid. The specific rotation of this sample was measured and found to be [α]25 D =-16.3. the acid in the aqueous layer was extracted with ethyl acetate by adding anhydrous sodium sulfate and the solvent was removed by evaporation The organic layer was further distilled purified