Sodium Azide → HCID 178525126, compound

Participants

Reaction Conditions

Reaction Steps

A mixture of 4-cyano-piperidine-1-carboxylic acid benzyl ester (0.73 g, 3.0 mmol), sodium azide (0.39 g, 6.0 mmol) and zinc bromide (0.33 g, 1.5 mmol) in 2-propanol (5 mL) and water (10 mL) was stirred at 120° C. for 3 days into a pressure tube. The reaction mixture was then partitioned between aqueous 3.0N HCl (1.5 mL) and ethyl acetate and then stirred vigorously until 2 clear phases were obtained. Aqueous layer was then extracted with ethyl acetate and combined ethyl acetate layers dried over Na2SO4, filtered, and the solvent evaporated in vacuo to yield a crude residue. The residue was dissolved in ethyl acetate (10 mL) and washed with 0.25N aqueous sodium hydroxide. Aqueous layer was acidified to pH=1 with aqueous 3.0N HCl and extracted with ethyl acetate. Ethyl acetate layer was dried over Na2SO4, filtered, and the solvent evaporated in vacuo to yield a crude gum. The gum was purified via flash chromatography (4% methanol in dichloromethane) to yield 4-(1H-Tetrazol-5-yl)-piperidine-1-carboxylic acid benzyl ester as a gum (1.14 g, 66%).

Provenance & Evidence