3,4-dihydro-2H-pyran → 5-Bromo-1-(tetrahydropyran-2-yloxy)indane

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Reaction Steps

9.6 g of 5-bromo-1-hydroxyindane was dissolved in 100 ml of dry methylene chloride. To the solution were added, at room temperature, 570 mg of pyridinium p-toluenesulfonate and 4.5 ml of 3,4-dihydro-2H-pyran. The resulting mixture was stirred at the same temperature for 3 hours. The reaction mixture was added to ice water. The organic layer was separated, washed with a saturated aqueous sodium chloride solution, and dried over anhydrous magnesium sulfate. The solvent was removed by distillation under reduced pressure. The residue thus obtained was purified by column chromatography (eluant: toluene/ethyl acetate=15/1) to obtain 13.1 g of oily 5-bromo-1-(tetrahydropyran-2-yloxy)indane.

Provenance & Evidence