Potassium Carbonate → HCID 66750821, compound

Participants

Reaction Steps

To an ice-cold mixture of 1-Boc-4-piperidinecarboxylic acid (9.65 g, 42.1 mmol) and K2CO3 (23.3 g, 168.4 mmol) in N,N-dimethylformamide (60 mL) were added diphenylphosphoryl azide (16.1 g, 58.5 mmol) and methyl isocyanoacetate (5.0 g, 50.5 mmol). After being stirred at room temperature for 16 h, the reaction mixture was partitioned between ethyl acetate and water. The organic layer was washed with water, saturated NaHCO3 solution, and brine, dried over anhydrous magnesium sulfate, filtered and concentrated under reduced pressure. The resulting residue was purified by silica gel column chromatography (hexane/ethyl acetate 80:20 to 20:80) to give the title compound (9.07 g, 69%) as a yellow solid.

Provenance & Evidence