(2S,4S)-2-氨基-4-苯基己酸甲酯

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

实验步骤: To a suspension of lithium aluminum hydride (121 mg, 3.18 mmol) in tetrahydrofuran (8 ml) was added a solution of (2S,4S)-2-amino-4-phenyl-hexanoic acid methyl ester (320 mg, 1.45 mmol) in tetrahydrofuran (10 ml) and the mixture was stirred for 16 hours. The reaction was quenched by dropwise addition of ethyl acetate, then acidified to pH 5 by addition of hydrochloric acid and then made basic by addition of saturated aqueous sodium bicarbonate solution. The mixture was taken up in ethyl acetate/tetrahydrofuran (1:1), the phases were separated and the organic phase was washed sequentially with water and with saturated brine. The organic phase was then dried over Na2SO4 and concentrated in vacuo. The residue was purified by chromatography (column: Isolute® Flash-NH2 from Separtis; eluent: dichloromethane/MeOH) to yield a yellow oil, (116 mg, 42%); MS (ISP): 194.4 ([M+H]+). The reaction was quenched by dropwise addition of ethyl acetate acidified to pH 5 by addition of hydrochloric acid made basic by addition of saturated aqueous sodium bicarbonate solution the phases were separated the organic phase was washed sequentially with water and with saturated brine The organic phase was then dried over Na2SO4 concentrated in vacuo The residue was purified by chromatography (column: Isolute® Flash-NH2 from Separtis; eluent: dichloromethane/MeOH) to yield a yellow oil, (116 mg, 42%)

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

实验步骤: To a solution of trifluoroacetic acid (3.4 ml) in water (440 ml) was added dropwise over 15 min a solution of (2R,5S)-2-isopropyl-3,6-dimethoxy-5-((S)-2-phenyl-butyl)-2,5-dihydro-pyrazine (4.69 g, 14.8 mmol) in acetonitrile (75 ml). The mixture was stirred overnight at room temperature then made basic by addition of saturated aqueous sodium carbonate solution and the mixture was extracted with ethyl acetate. The phases were separated and the organic phase was washed sequentially with water and with saturated brine, then dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (SiO2, EtOAc/heptane) to yield a yellow oil (2.78 g, 85%); MS (ISP): 222.1 ([M+H]+). the mixture was extracted with ethyl acetate The phases were separated the organic phase was washed sequentially with water and with saturated brine dried over Na2SO4 filtered concentrated in vacuo The residue was purified by column chromatography (SiO2, EtOAc/heptane)

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

实验步骤: To a solution of trifluoroacetic acid (3.4 ml) in water (440 ml) was added dropwise over 15 min a solution of (2R,5S)-2-isopropyl-3,6-dimethoxy-5-((S)-2-phenyl-butyl)-2,5-dihydro-pyrazine (4.69 g, 14.8 mmol) in acetonitrile (75 ml). The mixture was stirred overnight at room temperature then made basic by addition of saturated aqueous sodium carbonate solution and the mixture was extracted with ethyl acetate. The phases were separated and the organic phase was washed sequentially with water and with saturated brine, then dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (SiO2, EtOAc/heptane) to yield a yellow oil (2.78 g, 85%); MS (ISP): 222.1 ([M+H]+). the mixture was extracted with ethyl acetate The phases were separated the organic phase was washed sequentially with water and with saturated brine dried over Na2SO4 filtered concentrated in vacuo The residue was purified by column chromatography (SiO2, EtOAc/heptane)

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

实验步骤: To a suspension of lithium aluminum hydride (121 mg, 3.18 mmol) in tetrahydrofuran (8 ml) was added a solution of (2S,4S)-2-amino-4-phenyl-hexanoic acid methyl ester (320 mg, 1.45 mmol) in tetrahydrofuran (10 ml) and the mixture was stirred for 16 hours. The reaction was quenched by dropwise addition of ethyl acetate, then acidified to pH 5 by addition of hydrochloric acid and then made basic by addition of saturated aqueous sodium bicarbonate solution. The mixture was taken up in ethyl acetate/tetrahydrofuran (1:1), the phases were separated and the organic phase was washed sequentially with water and with saturated brine. The organic phase was then dried over Na2SO4 and concentrated in vacuo. The residue was purified by chromatography (column: Isolute® Flash-NH2 from Separtis; eluent: dichloromethane/MeOH) to yield a yellow oil, (116 mg, 42%); MS (ISP): 194.4 ([M+H]+). The reaction was quenched by dropwise addition of ethyl acetate acidified to pH 5 by addition of hydrochloric acid made basic by addition of saturated aqueous sodium bicarbonate solution the phases were separated the organic phase was washed sequentially with water and with saturated brine The organic phase was then dried over Na2SO4 concentrated in vacuo The residue was purified by chromatography (column: Isolute® Flash-NH2 from Separtis; eluent: dichloromethane/MeOH) to yield a yellow oil, (116 mg, 42%)

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

实验步骤: To a solution of trifluoroacetic acid (3.4 ml) in water (440 ml) was added dropwise over 15 min a solution of (2R,5S)-2-isopropyl-3,6-dimethoxy-5-((S)-2-phenyl-butyl)-2,5-dihydro-pyrazine (4.69 g, 14.8 mmol) in acetonitrile (75 ml). The mixture was stirred overnight at room temperature then made basic by addition of saturated aqueous sodium carbonate solution and the mixture was extracted with ethyl acetate. The phases were separated and the organic phase was washed sequentially with water and with saturated brine, then dried over Na2SO4, filtered and concentrated in vacuo. The residue was purified by column chromatography (SiO2, EtOAc/heptane) to yield a yellow oil (2.78 g, 85%); MS (ISP): 222.1 ([M+H]+). the mixture was extracted with ethyl acetate The phases were separated the organic phase was washed sequentially with water and with saturated brine dried over Na2SO4 filtered concentrated in vacuo The residue was purified by column chromatography (SiO2, EtOAc/heptane)