4-[2-(dimethylamino)ethoxy]-4-oxobutanoic acid

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: In a two liter four neck flask equipped with stirrer, thermometer, condenser and addition funnel were charged succinic anhydride (200 g) and tetrahydrofuran (1400 ml). A homogeneous solution of succinic anhydride in tetrahydrofuran was made when the pot temperature reached 50° C. with external heating. Dimethylaminoethanol (178 g) was added at a rate that the exothermic reaction kept the pot temperature at 55° C. to 60° C. The reaction mixture was digested at 50° C. for a period of two hours after the addition of dimethylaminoethanol was completed. A first crop of crystalline product was collected by filtration and a second crop of product was collected from the mother liquor after concentration to 250 ml by means of reduced pressure distillation. These products were combined and dried in a vacuum over at 40° C. and 3 mm Hg pressure. The total yield was 303 g, 80% of the theoretical yield. thermometer, condenser and addition funnel reached 50° C. with external heating at 55° C. to 60° C A first crop of crystalline product was collected by filtration a second crop of product was collected from the mother liquor after concentration to 250 ml by means of reduced pressure distillation dried in a vacuum over at 40° C. and 3 mm Hg pressure

反応条件: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

実験手順: The 2-dimethylamino ethanol (10 g, 0.11 mol) was dissolved in pyridine (100 mL) followed by the addition of succinic anhydride (16 g, 0.16 mol). The mixture was stirred at room temperature for 18 h before the pyridine was removed under vacuum at 40 C. The remaining solid was recrystallized from MeOH/Ether. The characterization data were consistent with the chemical structure and formula. was removed under vacuum at 40 C The remaining solid was recrystallized from MeOH/Ether