Toluene → (4-Formyltetrahydropyran-4-yl)carbamic acid tert-butyl ester

Participants

Reaction Steps

The toluene solution of diisobutylaluminum hydride (72.3 mL, 73.0 mmol) was dropped in the dehydrated toluene (50 mL) solution of methyl 4-t-butoxycarbonylamino-tetrahydro-pyran-4-carboxylate (4.74 g, 18.3 mmol) which had been obtained in 1) at −78° C. for 1 hour. After the reaction mixture had been stirred at the same temperature for 20 minutes, saturated aqueous ammonium chloride solution (20 mL) was dropped in 10 minutes and the mixture was stirred at room temperature for 15 minutes. Then, methanol (3 mL) was added and the mixture was further stirred at room temperature for 20 minutes. The precipitated insoluble matter was removed by filtration with Celite, and the filtrate was extracted with ethyl acetate. The organic layer was washed with water and saturated saline in order, and then dried with anhydrous magnesium sulfate. The crude product was refined with silica gel column chromatography (the ethyl acetate-hexane solution of 3:7 to 1:0 in mixing ratio) to give the desired product of colorless oily matter (2.00 g) and N-t-butyl-(4-hydroxymethyl-tetrahydro-pyran-4-yl)-carbamate (1.32 g).

Provenance & Evidence