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

Temperature

150 °C

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).

1. extractionextracted three times with DCM (50 mL)
2. washThe combined extracts are washed sequentially with 2 N sodium hydroxide, water, and brine
3. dry with materialdried over sodium sulfate
4. concentrationconcentrated

ORD record

ord-f14661b45db5408dbb99328ef303b063

Source dataset

uspto-grants-2012_06

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US08193183B2