反应详情

To a solution of 4,4-dimethoxytetrahydro-2H-pyran-3-ol (2.0 g, 12 mmol) in THF (20 mL) cooled in an ice bath was slowly added sodium hydride (0.60 g, 15 mmol) and the resulting slurry was stirred for 1 h. lodoethane (1.5 mL, 19 mmol) was added and the mixture was stirred at room temperature overnight. More sodium hydride (0.6 g) and iodoethane (3 mL) were added and stirring was continued another overnight. The reaction was quenched with water. The resulting solution was extracted with EtOAc twice and ether twice. The combined extracts were dried, concentrated and purified on silica gel (20% EtOAc/hexanes) to give 2.1 g (90%) of desired product. 1H NMR (CDCl3) δ 3.32-4.00 (7H, m), 3.30 (3H, s), 3.20 (3H, s), 2.05-1.70 (2H, m), 1.25-1.22 (3H, m).

1. additionwas added
2. stirringthe mixture was stirred at room temperature overnight
3. stirringstirring
4. waitwas continued another overnight
5. customThe reaction was quenched with water
6. extractionThe resulting solution was extracted with EtOAc twice
7. customThe combined extracts were dried
8. concentrationconcentrated
9. custompurified on silica gel (20% EtOAc/hexanes)