Trifluoroacetic acid → Ethyl 3-hydroxy-4-oxopiperidine-1-carboxylate

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Reaction Steps

Ethyl 3-hydroxy-4,4-dimethoxypiperidine-1-carboxylate from Example 34A (5.00 g, 21.4 mmol) was dissolved in THF (50 mL), and trifluoroacetic acid (15.9 mL, 214 mmol) was added. The mixture was stirred for 3.5 h at rt. The solvent was then removed in vacuo. Twice, toluene was added and again removed in vacuo. The residue was dissolved in dichloromethane, dried over sodium sulfate, and the solvent was removed in vacuo to yield 4.70 g (95%) of an oil, which was used without further purification.

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