Nitromethane → 4-Trifluoromethoxy-(2-nitro-vinyl)-benzene

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反応条件

反応手順

A solution of (4-trifluoromethoxy benzaldehyde (1 g, 5.26 mmol) and nitromethane (0.96 g, 15.8 mmol) in acetic acid (10.6 mL) is treated with ammonium acetate (1.01 g, 13.2 mmol) is heated under microwave to 150° C. for 15 minutes. The reaction mixture is diluted with water, and extracted three times with DCM (50 mL). The combined extracts are washed sequentially with 2 N sodium hydroxide, water, and brine, dried over sodium sulfate and concentrated. The residue is subjected to silica gel chromatography to yield 4-trifluoromethoxy-(2-nitro-vinyl)-benzene (1.23 g) as a solid. A portion of 4-trifluoromethoxy-(2-nitro-vinyl)-benzene (0.504 g, 2.16 mmol) is hydrogenated with hydrogen in a balloon, 10% Pd/C (115 mg, 5 mol %) in MeOH (22 mL) containing concentrated hydrochloric acid (0.27 mL) at room temperature for 15 hours. The mixture is filtered and filtrate is concentrated to a solid that is washed with diethyl ether to obtain 2-(4-trifluoromethoxy-phenyl)-ethylamine hydrochloride [0.3 g, 57%, Intermediate (12)] as a solid. LC/MS: MS: 206 (M+H).

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