Sodium Carbonate → 1-{[(9H-Fluoren-9-yl)methoxy]carbonyl}piperidine-2-carboxylic acid

Participants

Reaction Steps

To a stirred mixture of (S)-piperidine-2-carboxylic acid (1.0 g, 7.75 mmol) and Na2CO3 (1.65 g, 15.50 mmol) in water (10 mL) was added a solution of FMOC-Cl (3.0 g, 11.63 mmol) in 1,4-dioxane (10 mL) dropwise at 0° C. and the reaction mixture was stirred at room temperature for 16 h. The reaction mixture was diluted with water (50 mL) and washed with MTBE (25 mL). The aqueous layer was acidified with 1M aqueous HCl (10 mL) to pH 2 and extracted with EtOAc (3×50 mL). The combined organic extracts were washed with brine solution (50 mL), dried over anhydrous Na2SO4, filtered and concentrated to afford the title compound (1.41 g) as an off-white solid. The crude product was used in the next step without purification.

Provenance & Evidence