Methanol → 2-(3-Chloro-2-fluorophenyl)ethan-1-amine hydrochloride

温度

0 °C

1.87 g of (3-chloro-2-fluoro-phenyl)-acetonitrile (11 mmol) were dissolved in 18 ml THF and cooled down to 0° C. under nitrogen. 58 ml of a 1M borane-THF complex solution in THF (58 mmol) were then added dropwise over 20 min by keeping the temperature between 0 to 2° C. After addition the reaction mixture was stirred at rt for additional 20 min, and refluxed for 21 h. The reaction mixture was then cooled down to 0° C. and treated between 2 and 5° C. with 13 ml methanol over a period of 35 min. After 1 h refluxing the reaction mixture was concentrated, the residue dissolved in DCM and the amine extracted twice with 1N aqueous HCl. The combined aqueous phases were then treated with concentrated NaOH to adjust the pH to 12, and then extracted twice with DCM. The combined organic phases were then washed with water, dried over magnesium sulfate, filtered and concentrated in vacuo leading to 1.6 g colorless oil. This was dissolved in 50 ml diethylether, treated with 5 ml 2.6N HCl in diethylether, stirred at rt for additional 60 min, filtered and dried under high vacuo, leading to 1.6 g white solid (69%). MS (ISP) 174.2 (M+H)+.