Benzyl Alcohol → benzyl {5-[2-(tetrahydro-2H-pyran-2-yloxy)ethyl]pyrazin-2-yl}carbamate

Participants

Reaction Steps

To a solution of 5-[2-(tetrahydro-2H-pyran-2-yloxy)ethyl]pyrazine-2-carboxylic acid (1.28 g) in toluene (20 mL) were added triethylamine (0.85 ml) and diphenylphosphoryl azide (1.3 mL) at room temperature, followed by stirring at room temperature for 15 minutes. The reaction solution was warmed to 90° C., followed by stirring for 30 minutes. To the reaction solution was added benzyl alcohol (1.05 mL), followed by reflux for 3 hours. After leaving it to be cooled to room temperature, water was added to the reaction mixture, followed by extraction with ethyl acetate. The organic layer was sequentially washed with saturated aqueous sodium bicarbonate and saturated brine, and dried over anhydrous magnesium sulfate. After filtration and concentration, the obtained crude product was purified by silica gel column chromatography (hexane:ethyl acetate=5:1-2:1). The obtained solid was collected by filtration while washing with a solvent (hexane:diisopropyl ether=5:1), to obtain benzyl {5-[2-(tetrahydro-2H-pyran-2-yloxy)ethyl]pyrazin-2-yl}carbamate (461 mg) as a white solid.

Provenance & Evidence