2-but-3-enoxyacetaldehyde

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Hydroxylamine sulfate (20.5 g), sodium acetate (12.8 g) and water (20 ml) were added to a solution of 3-butenyloxyacetaldehyde (17.8 g; J. Chem. Soc., Perkin Trans. 1, 1999, 3143-3155) in ethanol (200 ml). The mixture was stirred at room temperature overnight and then water was added. The excess of ethanol was evaporated under reduced pressure and the resulting residue was extracted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography to obtain the title compound (6.20 g). The excess of ethanol was evaporated under reduced pressure the resulting residue was extracted with ethyl acetate The organic layer was washed with brine dried over anhydrous magnesium sulfate The solvent was evaporated under reduced pressure the residue was purified by silica gel column chromatography

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Hydroxylamine sulfate (20.5 g), sodium acetate (12.8 g) and water (20 ml) were added to a solution of 3-butenyloxyacetaldehyde (17.8 g; J. Chem. Soc., Perkin Trans. 1, 1999, 3143-3155) in ethanol (200 ml). The mixture was stirred at room temperature overnight and then water was added. The excess of ethanol was evaporated under reduced pressure and the resulting residue was extracted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography to obtain the title compound (6.20 g). The excess of ethanol was evaporated under reduced pressure the resulting residue was extracted with ethyl acetate The organic layer was washed with brine dried over anhydrous magnesium sulfate The solvent was evaporated under reduced pressure the residue was purified by silica gel column chromatography

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:60.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: (But-3-en-1-yloxy)acetaldehyde (C6) (40 g from the preceding step, ≦312 mmol) was dissolved in a 2:1 mixture of ethanol and water (700 mL). Sodium acetate (128 g, 1560 mmol) was added, and the mixture was stirred for 20 minutes. Hydroxylamine hydrochloride (98%, 66.4 g, 936 mmol) was then added, and the reaction mixture was heated to 60° C. for 18 hours, at which point it was cooled to room temperature and concentrated under reduced pressure to remove ethanol. The aqueous residue was poured into water (500 mL) and extracted four times with ethyl acetate. The combined organic layers were dried over magnesium sulfate, filtered, and concentrated in vacuo. Silica gel chromatography (Gradient: 0% to 40% ethyl acetate in heptane) afforded the product as an oil, presumed from the 1H NMR spectrum to be a mixture of E and Z oximes. Yield: 24 g, 0.19 mmol, 60% over three steps. 1H NMR (400 MHz, CDCl3) δ 2.33-2.41 (m, 2H), 3.51-3.57 (m, 2H), [4.11 (d, J=5.7 Hz) and 4.36 (d, J=3.7 Hz), total 2H], 5.04-5.16 (m, 2H), 5.76-5.89 (m, 1H), [6.92 (t, J=3.7 Hz) and 7.51 (t, J=5.6 Hz), total 1H]. was cooled to room temperature concentrated under reduced pressure to remove ethanol The aqueous residue was poured into water (500 mL) extracted four times with ethyl acetate The combined organic layers were dried over magnesium sulfate filtered concentrated in vacuo

反应条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: Hydroxylamine sulfate (20.5 g), sodium acetate (12.8 g) and water (20 ml) were added to a solution of 3-butenyloxyacetaldehyde (17.8 g; J. Chem. Soc., Perkin Trans. 1, 1999, 3143-3155) in ethanol (200 ml). The mixture was stirred at room temperature overnight and then water was added. The excess of ethanol was evaporated under reduced pressure and the resulting residue was extracted with ethyl acetate. The organic layer was washed with brine and dried over anhydrous magnesium sulfate. The solvent was evaporated under reduced pressure and the residue was purified by silica gel column chromatography to obtain the title compound (6.20 g). The excess of ethanol was evaporated under reduced pressure the resulting residue was extracted with ethyl acetate The organic layer was washed with brine dried over anhydrous magnesium sulfate The solvent was evaporated under reduced pressure the residue was purified by silica gel column chromatography