Dimethylformamide → 2-Chloro-4-fluoro-5-nitrobenzoyl chloride

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Reaction Steps

Under N2, to the solution of 2-chloro-4-fluoro-5-nitro-benzoic acid (1.0 g, 4.56 mmol in 40 mL of DCM at 0° C. are added thionyl chloride (1.0 mL, 13.68 mmol) and 0.1 mL of DMF sequentially. The reaction mixture was warmed gradually to room temperature and stirred overnight. The reaction mixture was concentrated in vacuo to afford 2-chloro-4-fluoro-5-nitrobenzoyl chloride. The crude was dissolved in 40 mL of DCM, and 1-boc-4-aminopiperidine (910 mg, 4.56 mmol) and triethylamine (1.29 mL, 9.12 mmol) were added to the solution sequentially. After stirring at room temperature 1 h, the reaction mixture was washed with 20 mL of water. The organic extract was dried (Na2SO4), followed by concentration in vacuo to afford tert-Butyl 4-(2-chloro-4-fluoro-5-nitrobenzamido)piperidine-1-carboxylate; ESMS m/z 402.1 (M+H+).

Provenance & Evidence