4-(Trifluoromethyl)aniline → 2,4-dichloro-N-(4-(trifluoromethyl)phenyl)benzamide

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Reaction Steps

Part A: 2,4-Dichlorobenzoyl chloride (40.0 g, 0.19 mol) is dissolved in tetrahydrofuran (1 L). To the resulting stirred solution is successively added diisopropylethylamine (DIPEA) (73.4 mL, 2.2 molar equivalent) and 4-(trifluoromethyl)phenylamine (30.7 g, 0.19 mol). After one hour the mixture is concentrated in vacuo to give an oil. This oil is crystallised from ethanol to give pure 2,4-dichloro-N-(4-(trifluoromethyl)phenyl)benzamide (53.2 g, 83% yield). 1H-NMR (200 MHz, DMSO-d6): δ 10.90 (br s, 1H), 7.91 (br d, J=8 Hz, 2H), 7.63–7.77 (m, 4H), 7.57 (dt, J=8 Hz, J=2 Hz, 1H).

Provenance & Evidence