反应详情

NaH (4.2 g, 0.11 mol) was washed with hexane and then suspended in dry THF (400 mL). Pentane-1,5-diol (10.4 g, 0.1 mol) in THF (50 mL) was added and stirred for 1 h at room temperature. Iodoethane (17.2 g, 0.11 mol) in THF (50 mL) was added and the mixture was refluxed for 48 h. After evaporation of the solvent, the residue was dissolved in EtOAc (300 mL). The organic phase was washed with water (2×50 mL ), brine (50 mL ), and dried (Na2SO4). The residue was purified by column chromatography on alumina with 10% 2-propanol in hexane, and then Kugelrohr distillation to give the title product (2) (9.4 g, 71%); bp 45°-46° C./0.005 torr; IR(neat): 3400 (broad) and 1115 cm-1 ; 1H NMR: 1.22 (t, 3H, J=6.8 Hz), 1.42 (m, 2H), 1.56 (m, 4H), 3.43 (t, 4H, J=5.8 Hz), 3.48 (q, 2H, J=6.8 Hz), and 3.58 ppm (b s, 1H).

1. temperaturethe mixture was refluxed for 48 h
2. customAfter evaporation of the solvent
3. dissolutionthe residue was dissolved in EtOAc (300 mL)
4. washThe organic phase was washed with water (2×50 mL ), brine (50 mL )
5. dry with materialdried (Na2SO4)
6. customThe residue was purified by column chromatography on alumina with 10% 2-propanol in hexane
7. distillationKugelrohr distillation