3-氧代-4-(4-氯-苯基)丁酸甲酯

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

实验步骤: Dimethyl oxalate (15.27 g, 0,129 mol), and 4'-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt. % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3 /300 MHz) 8 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0,129 mol), and 4'-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt. % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3 /300 MHz) 8 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0.129 mol), and 4′-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3/300 MHz) δ 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0.129 mol), and 4′-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3/300 MHz) δ 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0,129 mol), and 4'-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt. % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3 /300 MHz) 8 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0.129 mol), and 4′-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, meth-yl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3/300 MHz) δ 7.94 (d, J=8.06 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H) , 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0.129 mol), and 4′-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3/300 MHz) δ 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo

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

实验步骤: Dimethyl oxalate (15.27 g, 0,129 mol), and 4'-chloroacetophenone (20.0 g, 0.129 mol) were added to methanol (300 mL). Sodium methoxide (25 wt. % in methanol, 70 mL) was added dropwise over about 0.5 hour. The reaction was stirred at room temperature for 16 hours, whereupon the sodium salt of the butanoate precipitated from solution. The mixture was treated with 70 mL of conc. HCl and the white suspension was stirred vigorously at room temperature for 1 hour. The suspension was cooled to 0° C. and held for 0.5 hour. The solid was filtered, and the filter cake was washed with cold water (100 mL). After drying in vacuo, methyl 4-[4-(chloro)phenyl]-3-ketobutyrate was obtained (16.94 g, 54.4%) as the enol: 1H NMR (CDCl3 /300 MHz) 8 7.94 (d, J=8.66 Hz, 2H), 7.48 (d, J=8.66 Hz, 2H), 7.04 (s, 1H), 3.95 (s, 3H), 3.48 (s, 1H). precipitated from solution The mixture was treated with 70 mL of conc. HCl The suspension was cooled to 0° C. held for 0.5 hour The solid was filtered the filter cake was washed with cold water (100 mL) After drying in vacuo