Methyl chloroformate → Dimethyl 2-(4-chloro-2-fluorophenyl)piperidine-1,4-dicarboxylate

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Reaction Steps

Methyl 2-(4-chloro-2-fluorophenyl)piperidine-4-carboxylate (7.45 g, 27.42 mmol) was dissolved into DCM (120 mL) then DIPEA (11.97 mL, 68.55 mmol) was added. Methyl carbonochloridate (3.02 mL, 38.39 mmol) was added dropwise to the solution. The mixture was stirred at room temperature for 3 h. The mixture was washed with 0.1 M HCl (2×100 mL) and satd NaHCO3 (100 mL), then dried through a phase-separator and evaporated leaving dimethyl 2-(4-chloro-2-fluorophenyl)piperidine-1,4-dicarboxylate (7.77 g, 86%) as an orange oil. MS m/z 330 (M+H)+

Provenance & Evidence