Ethyl Acetate → tert-butyl 4-hydroxy-4-(1H-1-imidazolylmethyl)-1-piperidinecarboxylate

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4.25 g of tert-butyl 1-oxa-6-azaspiro[2.5]octane-6-carboxylate was dissolved in 30 ml dimethylformamide, 5.38 g of sodium imidazole was added thereto, and the mixture was stirred at 60° C. for 3 hr and 40 min. After cooling, ethyl acetate was added to the reaction solution, and it was washed with water for 3 times and then with brine, dried over anhydrous magnesium sulfate, and filtered. The filtrate was evaporated and subjected to silica gel column chromatography to give 4.93 g of tert-butyl 4-hydroxy-4-(1H-1-imidazolylmethyl)-1-piperidinecarboxylate.

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