1-溴-2,3-丁二酮

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

实验步骤: 11.4 g (50 mmols) of 1,2-dimethoxy-4,5-dinitrobenzene are dissolved in 100 ml of glacial acetic acid and, after adding 0.6 g of 10% strength palladium-on-characoal, hydrogenated under normal pressure; the temperature can rise to 60° C. during the hydrogenation. Consumption of hydrogen: 7,300 ml (100% of theory). The catalyst is filtered off and the filtrate is cooled, under nitrogen, to 5° to 10° C. Whilst stirring well, 9 g (55 mmols) of 1-bromo-2,3-butanedione are added dropwise at 10° C. The solution is stirred for 60 minutes, during which time the desired product starts to precipitate out. The reaction mixture is discharged into 300 ml of cold water and the mixture is stirred for 10 minutes. The product which has precipitated is filtered off, washed with water and dried in vacuo at 60° C. can rise to 60° C. during the hydrogenation Consumption of hydrogen The catalyst is filtered off the filtrate is cooled, under nitrogen, to 5° to 10° C

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

实验步骤: A suspension of 1-bromo-2,3-butanedione (47 g) and N-[(thiocarbamoyl)methyl]acetamide (30 g) in acetone (600 ml) was refluxed for 3 hours. The resulting precipitate was collected by filtration to afford 4-acetyl-2-(acetylaminomethyl)thiazole (41.8 g). was refluxed for 3 hours The resulting 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: A suspension of 1-bromo-2,3-butanedione (47 g) and N-[(thiocarbamoyl)methyl]acetamide (30 g) in acetone (600 ml) was refluxed for 3 hours. The resulting precipitate was collected by filtration to afford 4-acetyl-2-(acetylaminomethyl)thiazole (41.8 g). was refluxed for 3 hours The resulting 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: 11.4 g (50 mmols) of 1,2-dimethoxy-4,5-dinitrobenzene are dissolved in 100 ml of glacial acetic acid and, after adding 0.6 g of 10% strength palladium-on-charcoal, hydrogenated under normal pressure; the temperature can rise to 60° C. during the hydrogenation. Consumption of hydrogen: 7,300 ml (100% of theory). The catalyst is filtered off and the filtrate is cooled, under nitrogen, to 5° to 10° C. Whilst stirring well, 9 g (55 mmols) of 1-bromo-2,3-butanedione are added dropwise at 10° C. The solution is stirred for 60 minutes, during which time the desired product starts to precipitate out. The reaction mixture is discharged into 300 ml of cold water and the mixture is stirred for 10 minutes. The product which has precipitated is filtered off, washed with water and dried in vacuo at 60° C. can rise to 60° C. during the hydrogenation Consumption of hydrogen The catalyst is filtered off the filtrate is cooled, under nitrogen, to 5° to 10° C

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

实验步骤: A suspension of 1-bromo-2,3-butanedione (47 g) and N-[(thiocarbamoyl)methyl]acetamide (30 g) in acetone (600 ml) was refluxed for 3 hours. The resulting precipitate was collected by filtration to afford 4-acetyl-2-(acetylaminomethyl)thiazole (41.8 g). was refluxed for 3 hours The resulting 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: 11.4 g (50 mmols) of 1,2-dimethoxy-4,5-dinitrobenzene are dissolved in 100 ml of glacial acetic acid and, after adding 0.6 g of 10% strength palladium-on-characoal, hydrogenated under normal pressure; the temperature can rise to 60° C. during the hydrogenation. Consumption of hydrogen: 7,300 ml (100% of theory). The catalyst is filtered off and the filtrate is cooled, under nitrogen, to 5° to 10° C. Whilst stirring well, 9 g (55 mmols) of 1-bromo-2,3-butanedione are added dropwise at 10° C. The solution is stirred for 60 minutes, during which time the desired product starts to precipitate out. The reaction mixture is discharged into 300 ml of cold water and the mixture is stirred for 10 minutes. The product which has precipitated is filtered off, washed with water and dried in vacuo at 60° C. can rise to 60° C. during the hydrogenation Consumption of hydrogen The catalyst is filtered off the filtrate is cooled, under nitrogen, to 5° to 10° C