Ethyl 4-piperidinecarboxylate → 1-(3,3-Dimethyl-butyl)-piperidine-4-carboxylic Acid Ethyl Ester

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Reaction Steps

3,3-Dimethylbutyraldehyde (5.26 ml, 42.0 mmol) was added to a solution of ethyl isonipecotate (6.6 g, 42.0 mmol) in methanol/acetic acid (99:1, v/v, 50 ml) and the mixture was stirred at room temperature for 1 h. Sodium cyanoborohydride (3.43 g, 54.6 mmol) was added, and the mixture was stirred at room temperature for 4 days then concentrated in vacuo. The residue was purified by flash chromatography on silica gel (eluant; 25% EtOAc:75% cyclohexane) to yield the title compound (7.16 g, 71%).

Provenance & Evidence