3-(羟甲基)戊-2-one

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: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.

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

实验步骤: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.

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

实验步骤: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.

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

实验步骤: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.

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

实验步骤: 3-Hydroxymethyl-pentan-2-one (20.7 g) was dissolved in CHCl3 (150 mL) and cooled in an ice bath. Acetic anhydride (80 mL) was added, followed by DMAP (2.18 g), and the mixture was stirred overnight at room temperature. After cooling in an ice bath, MeOH (120 mL) was added dropwise, and the mixture was poured into a saturated aqueous NaHCO3 solution. After extraction with DCM twice, the combined organic phases were dried over Na2SO4 and evaporated under reduced pressure to give 28.0 g of a light-yellow liquid. 1H NMR (400 MHz, CDCl3) δ 0.93 (t, J=8 Hz, 3H), 1.46-1.75 (m, 2H), 2.03 (s, 3H), 2.20 (s, 3H), 2.77 (quint., J=6.5 Hz, 1H), 4.20 (d, J=7 Hz, 3H). cooled in an ice bath After cooling in an ice bath After extraction with DCM twice the combined organic phases were dried over Na2SO4 evaporated under reduced pressure

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

实验步骤: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.

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

实验步骤: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.

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

实验步骤: 3-Hydroxymethyl-pentan-2-one (20.7 g) was dissolved in CHCl3 (150 mL) and cooled in an ice bath. Acetic anhydride (80 mL) was added, followed by DMAP (2.18 g), and the mixture was stirred overnight at room temperature. After cooling in an ice bath, MeOH (120 mL) was added dropwise, and the mixture was poured into a saturated aqueous NaHCO3 solution. After extraction with DCM twice, the combined organic phases were dried over Na2SO4 and evaporated under reduced pressure to give 28.0 g of a light-yellow liquid. 1H NMR (400 MHz, CDCl3) δ 0.93 (t, J=8 Hz, 3H), 1.46-1.75 (m, 2H), 2.03 (s, 3H), 2.20 (s, 3H), 2.77 (quint., J=6.5 Hz, 1H), 4.20 (d, J=7 Hz, 3H). cooled in an ice bath After cooling in an ice bath After extraction with DCM twice the combined organic phases were dried over Na2SO4 evaporated under reduced pressure

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: 3-Hydroxymethyl-pentan-2-one (20.7 g) was dissolved in CHCl3 (150 mL) and cooled in an ice bath. Acetic anhydride (80 mL) was added, followed by DMAP (2.18 g), and the mixture was stirred overnight at room temperature. After cooling in an ice bath, MeOH (120 mL) was added dropwise, and the mixture was poured into a saturated aqueous NaHCO3 solution. After extraction with DCM twice, the combined organic phases were dried over Na2SO4 and evaporated under reduced pressure to give 28.0 g of a light-yellow liquid. 1H NMR (400 MHz, CDCl3) δ 0.93 (t, J=8 Hz, 3H), 1.46-1.75 (m, 2H), 2.03 (s, 3H), 2.20 (s, 3H), 2.77 (quint., J=6.5 Hz, 1H), 4.20 (d, J=7 Hz, 3H). cooled in an ice bath After cooling in an ice bath After extraction with DCM twice the combined organic phases were dried over Na2SO4 evaporated under reduced pressure

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

实验步骤: Accordingly to the method described in J. Heterocyclic Chem., 24, 351 (1987), a mixture 2-ethyl-3-oxobutanol, sodium salt (37.5 g, 0.275 mol), cyanoacetamide (25.2 g, 0.30 mol), aqueous piperidinium acetate (22 mL) [prepared from glacial acetic acid (4.2 mL), water (10 mL) and piperidine (7.2 mL)] in water (775 ml) was refluxed for four hours. Glacial acetic acid (30 ml) was added cautiously (much foaming) as the product precipitated. Upon cooling to room temperature, the product was collected by filtration, washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C. precipitated the product was collected by filtration washed with cold water and air dried to yield 22.3 g (50%), m.p. 237°-240° C.