tert-Butyl 4-(2-ethoxy-2-oxoethylidene)piperidine-1-carboxylate → Ethyl 1-((1,1-dimethylethoxy)carbonyl)-4-piperidineacetate

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Reaction Steps

tert-Butyl 4-(2-ethoxy-2-oxoethylidene)piperidine-1-carboxylate (5.0 g, 18.58 mmol, 1 eq) was dissolved in ethanol (20 ml) and degassed for 30 min with nitrogen. Pd—C (500 mg, 10%) was added, and hydrogenation was carried out for 12 h at RT under balloon pressure (H2). After monitoring by thin-layer chromatography, the reaction mixture was filtered off over Celite and washed with ethanol (200 ml), and the filtrate was concentrated under reduced pressure. Yield: 89% (4.5 g, 16.6 mmol).

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