Chlorotrimethylsilane → Tert-butyl 4-{1-[(trimethylsilyl)oxy]vinyl}piperidine-1-carboxylate

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Reaction Steps

To a solution of LDA in THF (70 mL) under nitrogen atmosphere, cooled to −78° C. via dry ice/acetone bath, was added tert-butyl 4-acetylpiperidine-1-carboxylate (5 g, 22 mmol) in THF (30 mL) dropwise over 30 min. The resulting mixture was stirred for an additional 30 min and then TMSCl (2.81 mL) was added via syringe dropwise over 10 min and the resulting solution stirred for 1 h at −78° C. Quench with saturated sodium bicarbonate (300 mL) and extracted with ether (2×200 mL). Combined the organics, wash with brine, dry over sodium sulfate, filter, and concentrate under vacuum. The compound obtained (6.0 g, 92%) was used for the next reaction without further purification.

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