四氢呋喃-2-乙酸乙酯

反应条件: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a round-bottom flask was added a solution of ethyl 2-(tetrahydrofuran-2-yl)acetate (2.00 g, 12.6 mmol, 1.00 equiv) in ethanol (20 mL). NH2NH2.H2O (1.27 g, 25.4 mmol, 2.00 equiv) was added to the reaction. The resulting solution was stirred overnight at 80° C. in an oil bath, then cooled to room temperature and concentrated in vacuo. This resulted in 2.10 g (92%) of 2-(tetrahydrofuran-2-yl)acetohydrazide as a yellow oil. cooled to room temperature concentrated in vacuo This resulted in 2.10 g (92%) of 2-(tetrahydrofuran-2-yl)acetohydrazide as a yellow oil

反应条件: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a round-bottom flask was added a solution of ethyl 2-(tetrahydrofuran-2-yl)acetate (2.00 g, 12.6 mmol, 1.00 equiv) in ethanol (20 mL). NH2NH2.H2O (1.27 g, 25.4 mmol, 2.00 equiv) was added to the reaction. The resulting solution was stirred overnight at 80° C. in an oil bath, then cooled to room temperature and concentrated in vacuo. This resulted in 2.10 g (92%) of 2-(tetrahydrofuran-2-yl)acetohydrazide as a yellow oil. cooled to room temperature concentrated in vacuo This resulted in 2.10 g (92%) of 2-(tetrahydrofuran-2-yl)acetohydrazide as a yellow oil

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

实验步骤: Following the procedure of Preparative Example 14, 2.0 g (17.5 mmol) of ethyl diazo acetate was reacted with tetrahydrofuran to give 1.7 g of the product as a colorless oil, bp 84°-86° C. at 20 mm Hg.

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

实验步骤: Following the procedure of Preparative Example 14, 2.0 g (17.5 mmol) of ethyl diazo acetate was reacted with tetrahydrofuran to give 1.7 g of the product as a colorless oil, bp 84°-86° C. at 20 mm Hg.

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

实验步骤: A solution of (rac.)-(tetrahydro-furan-2-yl)-acetic acid ethyl ester (3.84 g, 24 mmol) in n-butanol (24 mL) was treated with hydrazine hydrate (1.4 mL, 29 mmol) and the resulting mixture was then heated under reflux for 3 h. The solvent was evaporated and residual volatile components were azeotropically removed by coevaporation with toluene. Chromatographic purification (SiO2, dichloromethane:methanol:aq.ammonia (25%)=100:0:0 to 90:10:1) afforded the title compound as a viscous, colorless oil (1.1 g, 32%). 1H-NMR (300 MHz, DMSO): δ=1.45 (mc, 1H), 1.70-1.95 (m, 3H), 2.13 (dd, J=6 Hz, J=14 Hz, 1H), 2.24 (dd, J=7 Hz, J=14 Hz, 1H), 3.56 (dd, J=8 Hz, J=14 Hz, 1H), 3.72 (dd, J=7 Hz, J=14 Hz, 1H), 4.05 (mc, 1H), 4.16 (s, 2H), 8.94 (s, 1H). the resulting mixture was then heated under reflux for 3 h The solvent was evaporated residual volatile components were azeotropically removed by coevaporation with toluene Chromatographic purification (SiO2, dichloromethane:methanol:aq.ammonia (25%)=100:0:0 to 90:10:1)

反应条件: temp:80.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: To a round-bottom flask was added a solution of ethyl 2-(tetrahydrofuran-2-yl)acetate (2.00 g, 12.6 mmol, 1.00 equiv) in ethanol (20 mL). NH2NH2.H2O (1.27 g, 25.4 mmol, 2.00 equiv) was added to the reaction. The resulting solution was stirred overnight at 80° C. in an oil bath, then cooled to room temperature and concentrated in vacuo. This resulted in 2.10 g (92%) of 2-(tetrahydrofuran-2-yl)acetohydrazide as a yellow oil. cooled to room temperature concentrated in vacuo This resulted in 2.10 g (92%) of 2-(tetrahydrofuran-2-yl)acetohydrazide as a yellow oil