4-Toluenesulfonyl chloride → Tetrahydro-2H-pyran-4-yl 4-methylbenzenesulfonate

Participants

Reaction Steps

To a solution of 133 g (1.31 mol) of tetrahydro-pyran-4-ol in pyridine (1.5 L) are added 373 g (1.95 mol) of p-toluenesulfonylchloride portionwise at 10° C. After complete addition the reaction is allowed to warm to room temperature and stirred for 18 h. The reaction is poured onto a stirred mixture of aqueous HCl/ice. The resulting precipitate is isolated by filtration and dissolved in DCM (1 L). The organic layer is washed with 1M aqueous HCl solution (1 L), followed by saturated aqueous NaHCO3 solution (1 L) and is then dried over Na2SO4. Filtration and concentration of the filtrate under reduced pressure gives 300 g of toluene-4-sulfonic acid tetrahydro-pyran-4-yl ester as an orange oil. Yield: 90%, ES-MS: m/z: 257 [M+H], 279 [M+Na].

Provenance & Evidence