Citric Acid → Tert-butyl 4-benzyl-4-hydroxypiperidine-1-carboxylate

Participants

Reaction Steps

A solution of 4-hydroxy-4-benzyl piperidine (0.66 g, 3.5 mmol) in 1M NaOH (7 mL, 7 mmol) and dioxane (5 mL) at 0° C. was treated with BOC2O (0.76 g, 3.5 mmol), warmed to room temperature, stirred for 16 hours, adjusted to pH<7 with 10% citric acid, and extracted twice with ethyl acetate. The combined extracts were washed with water and brine, dried (Na2SO4), filtered, and concentrated to provide the desired product.

Provenance & Evidence