Sodium hydride → 4-(Isoquinolin-6-yloxy)-piperidine-1-carboxylic acid tert-butyl ester

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Reaction Conditions

Reaction Steps

7.49 g of 4-hydroxy-piperidine-1-carboxylic acid-tert-butylester were dissolved in 20 mL of dry dimethyl acetamide. 1.49 g of sodium hydride (60%) were added. Then a solution of 3.65 g of 6-fluoroisoquinoline (3) in dimethyl acetamide was added dropwise. The solution was heated at 80° C. for 2 hours, then the solvent was removed and the residue was taken up in dichloromethane. The organic layer was extracted twice with water and then with brine, dried over magnesium sulfate and evaporated to dryness. The crude product was purified by silica gel chromatography to yield 6.22 g of 4-(isoquinolin-6-yloxy)-piperidine-1-carboxylic acid-tert-butylester (7). Rt=1.32 min (Method B). Detected mass: 329.1 (M+H+).

Provenance & Evidence