(S)-4-苯基-2-羟基丁酸乙酯

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

实验步骤: To a suspension of potassium cyanide (0. 176 g, 2.70 mmole) in absolute ethanol (43 mL) was added a solution of (S)-2-[4-nitrobenzoyl]-4-phenylbutyric acid, ethyl ester (3.86 g, 10.8 mmole) in absolute ethanol (38 mL) dropwise over a period of 0.5 hours. After stirring 2.25 hours the solvent was removed and the reside was diluted with water and acidified with dilute hydrochloric acid. The organics were extracted with ether. The extracts were combined, silica gel (60 mL) was added and the solvent was removed. The adsorbate was flash chromatographed, eluent (gradient 90/10-80/20 petroleum ether/ethyl acetate) and the solvents were chased with benzene to give the title compound as a yellow oil (1.67 g, 74%): NMR (CDCl3); δ7.38-7.16 (m, 5H), 4.30-4.10(m, 3H), 2.9-2.6 (m, 3H,), 2.2-1.9(m, 2H), 1.15(t, 4 Hz, 3H); [a]25D +178.23 at 10.98 mg/mL CHCl3. was removed the reside was diluted with water The organics were extracted with ether silica gel (60 mL) was added the solvent was removed chromatographed

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

实验步骤: To a suspension of potassium cyanide (0.176 g, 2.70 mmole) in absolute ethanol (43mL) was added a solution of (S)-2-[4-nitrobenzoyl]-4-phenylbutyric acid, ethyl ester (3.86 g, 10.8 mmole) in absolute ethanol (38 mL) dropwise over a period of 0.5 hours. After stirring 2.25 hours the solvent was removed and the reside was diluted with water and acidified with dilute hydrochloric acid. The organics were extracted with ether. The extracts were combined, silica gel (60 mL) was added and the solvent was removed. The adsorbate was flash chromatographed, eluent (gradient 90/10-80/20 petroleum ether/ethyl acetate) and the solvents were chased with benzene to give the title compound as a yellow oil (1.67 g, 74%): NMR (CDCl3); δ 7.38-7.16 (m, 5H), 4.30-4.10(m, 3H), 2.9-2.6 (m, 3H,), 2.2 -1.9(m, 2H), 1.15(t, 4 Hz, 3H); [a]25D +178.23 at 10.98 mg/mL CHCl3. was removed the reside was diluted with water The organics were extracted with ether silica gel (60 mL) was added the solvent was removed chromatographed

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

实验步骤: To a suspension of potassium cyanide (0. 176 g, 2.70 mmole) in absolute ethanol (43 mL) was added a solution of (S)-2-[4-nitrobenzoyl]-4-phenylbutyric acid, ethyl ester (3.86 g, 10.8 mmole) in absolute ethanol (38 mL) dropwise over a period of 0.5 hours. After stirring 2.25 hours the solvent was removed and the reside was diluted with water and acidified with dilute hydrochloric acid. The organics were extracted with ether. The extracts were combined, silica gel (60 mL) was added and the solvent was removed. The adsorbate was flash chromatographed, eluent (gradient 90/10-80/20 petroleum ether/ethyl acetate) and the solvents were chased with benzene to give the title compound as a yellow oil (1.67 g, 74%): NMR (CDCl3); δ7.38-7.16 (m, 5H), 4.30-4.10(m, 3H), 2.9-2.6 (m, 3H,), 2.2-1.9(m, 2H), 1.15(t, 4 Hz, 3H); [a]25D +178.23 at 10.98 mg/mL CHCl3. was removed the reside was diluted with water The organics were extracted with ether silica gel (60 mL) was added the solvent was removed chromatographed