4-Fluoroaniline → HCID 10476762, compound

Participants

Reaction Steps

A solution of 2.4 g (6 mmol) of 4,5-bis(trimethylsilyloxy)cyclohexa-1,4-diene-1,2-dicarboxylic acid dimethyl ester (Example 1a) and 2.3 ml (24 mmol) of 4-fluoroaniline in 60 ml of glacial acetic acid is boiled under reflux for 2 hours. The reactionmixture is cooled, the solvent is evaporated off and the dark-brown residueis dissolved in dichloromethane and the solution is washed in succession with 20 ml of 1N HCl, 50 ml of saturated NaHCO3 and twice with 20 ml of water, dried with sodium sulfate and concentrated by evaporation. The evaporation residue is chromatographed on silica gel with ethyl acetate/hexane 2:1 and the product fractions are concentrated by evaporation and recrystallized from ethyl acetate/hexane, yielding the title compound in the form of yellow crystals, 1H-NMR (CDCl3): δ=7.40 (s, 2H), 7.10-6.80 (m, 8H), 5.70 (br s2H), 3.83 (s, 6H).

Provenance & Evidence