反应详情

温度

70 °C

To a THF (25 ml) solution of 1-(1H-1,2,3-benzotriazol-6-yl)ethanone (1.85 g, 11.5 mmol), (R)-(+)-2-methyl-2-propanesulfinylamide (2.30 g, 18.9 mmol) and titanium(IV) ethoxide (25 ml) were added and the mixture was stirred for 24 hours at 70° C. Then, the mixture was cooled to 0° C. and sodium borohydride (1.5 mg, 40 mmol) was added. After stirring for 2 hours, water and EtOH were added to the mixture with stirring for 1 hour at room temperature. Filtration, evaporation gave N-[(1R)-1-(1H-1,2,3-benzotriazol-6-yl)ethyl]-2-methylpropane-2-sulfinamide (MS (ESI) m/z 265 (M−H)−, 267 (M+H)+) which was treated with hydrochloric acid-MeOH (2.0 M, 15.0 ml) and 1,4-dioxane (15.0 ml) for 1.5 hours at room temperature. Then, the reaction mixture was evaporated and diethyl ether was added to form a precipitate, which was collected, washed with diethyl ether to give (1R)-1-(1H-1,2,3-benzotriazol-5-yl)ethanamine hydrochloride (1.26 g, 68%) MS (ESI) m/z 161 (M−H)−

1. temperatureThen, the mixture was cooled to 0° C.
2. stirringAfter stirring for 2 hours
3. stirringwith stirring for 1 hour at room temperature
4. filtrationFiltration, evaporation