p-Toluenesulfonic acid → 2H-Pyran, tetrahydro-2-(2-iodoethoxy)-

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Reaction Steps

Freshly distilled dihydropyran (Aldrich, 59.0 g, 0.7 mol) was added dropwise to a cooled solution of 2-iodoethanol (Aldrich, 98 g, 0.57 mol) in Et2O (1 L) containing 0.1 g of p-toluenesulfonic acid (Eastman). The solution was then stirred for 1 h at 5°. Solid K2CO3 (Mallinckrodt, 5 g) was then added to the reaction mixture and the resulting suspension stirred an additional 1 h at RT. The reaction was then filtered and the remaining solid washed with Et2O (1 L). The organic solutions were combined and concentrated rotary evaporation (in a flask washed with 1% NEt3 in H2O). The crude 2-(2-iodoethoxy)tetrahydro-2-H-pyran (~100 g, 68.9%) was used without further purification.

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