Potassium Carbonate → tert-Butyl 4-((4-(ethoxycarbonyl)-2-methoxyphenoxy)methyl)piperidine-1-carboxylate

Participants

Reaction Conditions

Reaction Steps

4-(4-Methylphenylsulphonyloxymethyl)-1-tert-butyloxycarbonylpiperidine (40 g, 0.11 mol) was added to a suspension of ethyl 3-methoxy-4-hydroxybenzoate (19.6 g, 0.1 mol) and potassium carbonate (28 g, 0.2 mol) in dry dimethylformamide (200 ml) and the reaction was heated at 95° C. for 2.5 hours. The reaction was cooled to ambient temperature, partitioned between water and ethyl acetate/diethyl ether, before the organic layer was washed with water and brine. Solvent evaporation in vacuo afforded a clear oil which crystallised on standing. Washing with isohexane and drying in vacuo yielded ethyl 3-methoxy-4-(1-tert-butyloxycarbonylpiperidin-4-ylmethoxy)benzoate (35 g, 89%) as a white solid:

Provenance & Evidence