p-Toluenesulfonic acid → 2-[(6-bromohexyl)oxy]tetrahydro-2H-pyran

関与物質

反応手順

To a solution of 6-bromo hexan-ol (F) (2 g, 11 mmol) in CH2Cl2 (50 ml) was added dropwise dihyrdopyran (1.6 ml, 16.5 mmol) followed by para-toluenesulphonic acid (commercially available) (0.075 g). The reaction mixture was stirred at room temperature for 16 h. The dark blue solution was then washed with water (2×25 ml) then saturated hydrogen carbonate solution (25 ml) and finally with a saturated sodium chloride solution (25 ml). The organic phase was then dried (MgSO4) and the solvent was evaporated under reduced pressure. The crude material was then purified through flash silica gel chromatography (hexane/EtOAc, 10:1) to afford compound 2-(6-Bromo-hexyloxy)-tetrahydropyran (G) as an oil (0.5 g, 70%).

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