1-N-Boc-4-Piperidinecarboxylic acid methyl ester → tert-Butyl 4-methoxycarbonyl-4-(2-(tert-butyldimethylsilyloxy)eth-1-yl)piperidine-1-carboxylate

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To a solution of KHMDS (8.72 g, 44 mmol) in THF (300 mL) at −70° C. was slowly added over 10 min a solution of tert-butyl 4-methoxycarbonylpiperidine-1-carboxylate (7.1 g, 29 mmol) in THF (70 mL). After 1 h, 2-bromo-1-(tert-butyldimethylsilyloxy)ethane (10 g, 47 mmol) was added and the reaction was allowed to warm to room temperature for 1 h. The mixture was poured into aq. sodium bicarbonate solution and extracted three times with ethyl acetate. The combined organic layers were washed with brine, dried over sodium sulfate, filtered, and concentrated. The residue was used directly in the next step. TLC (50% ethyl acetate in hexanes) indicated a mixture of bromide starting material and title product.

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