利多卡因EP杂质C

反应条件: temp:0.00; pressure:0.00; stir:

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: To a mixture of 30.1 g of N-acetyl-2,6-xylidine (0.18 mole) and 40 ml of acetic acid (0.70 mole) was added gradually 80 ml of concentrated sulfuric acid (0.50 mole) with stirring under ice-cooling. Then, to the mixture was added slowly 10 ml of fuming nitric acid (0.24 mole) in a manner such that the temperature of the reaction mixture did not exceed 10° C. The reaction mixture was returned to room temperature and, after stirring for 2 hours, poured onto ice. The resulting crystalline precipitate was collected by filtration and recrystallized from ethanol to give 35.5 g (92%) of the title compound (m.p. 171°-173° C.; pale yellow needles). cooling did not exceed 10° C was returned to room temperature after stirring for 2 hours poured onto ice The resulting crystalline precipitate was collected by filtration recrystallized from ethanol

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

实验步骤: To a mixture of 30.1 g of N-acetyl-2,6-xylidine (0.18 mole) and 40 ml of acetic acid (0.70 mole) was added gradually 80 ml of concentrated sulfuric acid (0.50 mole) with stirring under ice-cooling. Then, to the mixture was added slowly 10 ml of fuming nitric acid (0.24 mole) in a manner such that the temperature of the reaction mixture did not exceed 10° C. The reaction mixture was returned to room temperature and, after stirring for 2 hours, poured onto ice. The resulting crystalline precipitate was collected by filtration and recrystallized from ethanol to give 35.5 g (92%) of the title compound (m.p. 171°-173° C.; pale yellow needles). cooling did not exceed 10° C was returned to room temperature after stirring for 2 hours poured onto ice The resulting crystalline precipitate was collected by filtration recrystallized from ethanol

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

实验步骤: To 25 ml of 2,6-xylidine (0.20 mole) was added slowly a mixture of 25 ml of acetic anhydride (0.26 mole) and 25 ml of acetic acid (0.44 mole) under stirring at room temperature. The mixture was stirred for 30 minutes at room temperature and, then, diluted with water. The crystalline precipitate was collected by filtration to give 30.1 g (91%) of the title compound (m.p. 182°-184° C.; colorless needles). The mixture was stirred for 30 minutes at room temperature The crystalline precipitate was collected by filtration

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

实验步骤: reacting 2,6-dimethylaniline with acetic anhydride to form N-(2,6-dimethylphenyl) acetamide,

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

实验步骤: To a suspension of 2.5 g (0.05 mol) of sodium hydride in a mixture of 40 ml of dry-dimethylacetamide and 40 ml of dry benzene, 0.05 mole of N-(2,6-dimethylphenyl)acetamide was added. After evolution of hydrogen ceased, the mixture was cooled in ice and water, and with stirring 0.075 mole of carbon disulfide was added slowly. The mixture was stirred at room temperature for 20 minutes. The reaction mixture was poured into water and extracted with toluene. The organic layer, dried over sodium sulfate, was evaporated, and distillation of the residue yielded 6.1 g (74%) of 2,6-dimethylphenylisothiocyanate. in a mixture of 40 ml was added the mixture was cooled in ice was added slowly extracted with toluene The organic layer, dried over sodium sulfate was evaporated distillation of the residue

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

实验步骤: reacting 2,6-dimethylaniline with acetic anhydride to form N-(2,6-dimethylphenyl) acetamide,

反应条件: temp:0.00; pressure:0.00; stir:

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: reacting 2,6-dimethylaniline with acetic anhydride to form N-(2,6-dimethylphenyl) acetamide,

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

实验步骤: To a suspension of 2.5 g (0.05 mol) of sodium hydride in a mixture of 40 ml of dry-dimethylacetamide and 40 ml of dry benzene, 0.05 mole of N-(2,6-dimethylphenyl)acetamide was added. After evolution of hydrogen ceased, the mixture was cooled in ice and water, and with stirring 0.075 mole of carbon disulfide was added slowly. The mixture was stirred at room temperature for 20 minutes. The reaction mixture was poured into water and extracted with toluene. The organic layer, dried over sodium sulfate, was evaporated, and distillation of the residue yielded 6.1 g (74%) of 2,6-dimethylphenylisothiocyanate. in a mixture of 40 ml was added the mixture was cooled in ice was added slowly extracted with toluene The organic layer, dried over sodium sulfate was evaporated distillation of the residue