Hydrochloric Acid → 2-[4-((R)-2-hydroxy-2-phenylethylamino)phenyl]ethylamine

関与物質

反応条件

反応手順

To a 1000 mL 3-neck flask was added 10 g (74 mmol) of 2-(4-aminophenyl)ethylamine and 15 mL of 1,3-dimethyl-3,4,5,6-tetrahydro-2(1H)pyrimdinone (DMPU). The reaction flask was fitted with an overhead stirrer, a 125 mL addition funnel and a thermometer. The reaction flask was purged with nitrogen and placed in a cold water bath. The addition funnel was charged with 83 mL (83 mmol) of 1.0 M sodium bis(trimethylsilyl)amide in tetrahydrofuran. The sodium bis(trimethylsilyl)amide solution was added dropwise over 30 min with vigorous stirring. The addition funnel was removed and replaced with a rubber septum. (R)-styrene oxide (8.4 mL, 74 mmol) was added dropwise by syringe over 10 minutes. The rate of addition was controlled to maintain a temperature below 35° C. After 1 h, the reaction was quenched by dropwise addition of 88 mL water. The reaction mixture was transferred to a separatory funnel, diluted with 56 mL isopropyl acetate and washed with 84 mL saturated aqueous sodium chloride. The organic layer was washed a second time with a mixture of 84 mL water and 84 mL saturated aqueous sodium chloride and finally with 84 mL saturated aqueous sodium chloride. The organic layer was concentrated under vacuum. The residue was twice reconcentrated from isopropanol (55 mL portions) and then redissolved in isopropanol (235 mL) and heated to 70° C. with stirring. Concentrated hydrochloric acid (13.2 mL, 160 mmol) was added over two minutes. The mixture was allowed to cool to room temperature and stirred for 14 h. The precipitated product was isolated by filtration and washed with isopropanol and isopropyl acetate. The product was dried under vacuum for 3 h and then dissolved in 56 mL water and transferred to a separatory funnel. Isopropyl acetate (56 mL) and 10 N aqueous sodium hydroxide (19 mL, 190 mmol) were added. The separatory funnel was shaken and the phases separated. The organic layer was dried over sodium sulfate and concentrated to afford the product (2) as an orange-brown oil (11 g, 44 mmol, 59%). m/z: [M+H+] calcd for C16H20N2O 257.2. Found 257.2.

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