Triphosgene → 1-Chloro-4-iodo-5-isocyanato-2-(trifluoromethyl)benzene

関与物質

反応条件

反応手順

5-Chloro-2-iodo-4-(trifluoromethyl)aniline D10 (7.7 mmol, 2.2 g), bis(trichloromethyl) carbonate (0.35 eq., 2.7 mmol, 800 mg) were dissolved in 1,4-dioxane (10 ml) and the mixture was heated to 100° C. for 15 minutes; the mixture was then cooled to room temperature and it was filtered. The filtrate was concentrated to afford 1-chloro-4-iodo-5-isocyanato-2-(trifluoromethyl)benzene which was dissolved in dichloromethane (10 ml) and 1,1-dimethylethyl 4-amino-1-piperidinecarboxylate (2 eq., 11.4 mmol, 2.28 g) was added at room temperature; the mixture was stirred at room temperature for 1.5 hours. Solvent was subsequently evaporated and the crude obtained was purified by chromatography (ethyl acetate-n-hexane) to afford the title compound, 1.46 g, 46%, M+−H=546.

情報源と証拠