7-bromo-4-methyl-1,3-dihydro-1,4-benzodiazepine-2,5-dione

Conditions: temp:0.00; pressure:0.00; stir:

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 15.0 g of 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione and 7.5 g of copper (I) cyanide (freshly prepared) are mixed well in a mortar and heated from 165° to 195° with 7.2 ml of dry pyridine (freshly distilled over potassium hydroxide) under argon over a period of 3 hours. After cooling to 150°, the solid mass is dissolved in about 250 ml of boiling dimethylformamide. The mixture is left to cool, poured into 800 ml of ice-water and extracted three times with 500 ml of chloroform each time. The organic extracts are washed with 250 ml of 2 N hydrochloric acid and three times with 500 ml of water each time, dried in the presence of active carbon and evaporated. The residue is dissolved in about 1 l of methanol. The solution is concentrated to a volume of 250 ml, treated with active carbon and cooled to 5°. The precipitated material is filtered off under suction and dried, there being obtained 7-cyano-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione as white crystals of melting point 256°-258°. are mixed well in a mortar freshly distilled over potassium hydroxide) under argon over a period of 3 hours After cooling to 150° the solid mass is dissolved in about 250 ml of boiling dimethylformamide The mixture is left to cool poured into 800 ml of ice-water extracted three times with 500 ml of chloroform each time The organic extracts are washed with 250 ml of 2 N hydrochloric acid and three times with 500 ml of water each time dried in the presence of active carbon evaporated The residue is dissolved in about 1 l of methanol The solution is concentrated to a volume of 250 ml treated with active carbon cooled to 5° The precipitated material is filtered off under suction dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 15.0 g of 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione and 7.5 g of copper (I) cyanide (freshly prepared) are mixed well in a mortar and heated from 165° to 195° with 7.2 ml of dry pyridine (freshly distilled over potassium hydroxide) under argon over a period of 3 hours. After cooling to 150°, the solid mass is dissolved in about 250 ml of boiling dimethylformamide. The mixture is left to cool, poured into 800 ml of ice-water and extracted three times with 500 ml of chloroform each time. The organic extracts are washed with 250 ml of 2 N hydrochloric acid and three times with 500 ml of water each time, dried in the presence of active carbon and evaporated. The residue is dissolved in about 1 l of methanol. The solution is concentrated to a volume of 250 ml, treated with active carbon and cooled to 5°. The precipitated material is filtered off under suction and dried, there being obtained 7-cyano-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione as white crystals of melting point 256°-258°. are mixed well in a mortar freshly distilled over potassium hydroxide) under argon over a period of 3 hours After cooling to 150° the solid mass is dissolved in about 250 ml of boiling dimethylformamide The mixture is left to cool poured into 800 ml of ice-water extracted three times with 500 ml of chloroform each time The organic extracts are washed with 250 ml of 2 N hydrochloric acid and three times with 500 ml of water each time dried in the presence of active carbon evaporated The residue is dissolved in about 1 l of methanol The solution is concentrated to a volume of 250 ml treated with active carbon cooled to 5° The precipitated material is filtered off under suction dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 39.5 g of 5-bromoisatoic acid anhydride, 14.5 g of sarcosine and 150 ml of dimethyl sulphoxide is heated to 100° while stirring. After completion of the gas evolution, the mixture is stirred at 100° for a further 30 minutes and subsequently poured into 900 ml of ice-water. The precipitated crystals are filtered off under suction, washed with water and dried at 50° in vacuo over phosphorus pentoxide. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione as light beige crystals. A sample recrystallized from methanol has a melting point of 260°-261°. is heated to 100° After completion of the gas evolution, the mixture is stirred at 100° for a further 30 minutes The precipitated crystals are filtered off under suction washed with water dried at 50° in vacuo over phosphorus pentoxide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 15.0 g of 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5 (1H)-dione and 7.5 g of copper (I) cyanide (freshly prepared) are mixed well in a mortar and heated from 165° to 195° with 7.2 ml of dry pyridine (freshly distilled over potassium hydroxide) under argon over a period of 3 hours. After cooling to 150°, the solid mass is dissolved in about 250 ml of boiling dimethylformamide. The mixture is left to cool, poured into 800 ml of ice-water and extracted three times with 500 ml of chloroform each time. The organic extracts are washed with 250 ml of 2N hydrochloric acid and three times with 500 ml of water each time, dried in the presence of active carbon and evaporated. The residue is dissolved in about 1 l of methanol. The solution is concentrated to a volume of 250 ml, treated with active carbon and cooled to 5°. The precipitated material is filtered off under suction and dried, there being obtained 7-cyano-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione as white crystals of melting point 256-258°. are mixed well in a mortar freshly distilled over potassium hydroxide) under argon over a period of 3 hours After cooling to 150° the solid mass is dissolved in about 250 ml of boiling dimethylformamide The mixture is left to cool poured into 800 ml of ice-water extracted three times with 500 ml of chloroform each time The organic extracts are washed with 250 ml of 2N hydrochloric acid and three times with 500 ml of water each time dried in the presence of active carbon evaporated The residue is dissolved in about 1 l of methanol The solution is concentrated to a volume of 250 ml treated with active carbon cooled to 5° The precipitated material is filtered off under suction dried

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of 39.5 g of 5-bromoisatoic acid anhydride, 14.5 g of sarcosine and 150 ml of dimethyl sulphoxide is heated to 100° while stirring. After completion of the gas evolution, the mixture is stirred at 100° for a further 30 minutes and subsequently poured into 900 ml of ice-water. The precipitated crystals are filtered off under suction, washed with water and dried at 50° in vacuo over phosphorus pentoxide. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione as light beige crystals. A sample recrystallized from methanol has a melting point of 260°-261°. is heated to 100° After completion of the gas evolution, the mixture is stirred at 100° for a further 30 minutes The precipitated crystals are filtered off under suction washed with water dried at 50° in vacuo over phosphorus pentoxide

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 39.5 g of 5-bromoisatoic acid anhydride and 14.5 g of sarcosine in 150 ml of dimethyl sulphoxide is heated to 100° C. while stirring. In so doing, a vigorous evolution of carbon dioxide occurs from 70° C. and this has finished after ca 30 minutes. The mixture is stirred at 100° C. for a further 30 minutes and thereafter the mixture is poured into 900 ml of ice-water (temperature 5° C.) and the separated material is filtered off under suction. The crystals are washed with water and subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione in the form of light beige crystals. A sample recrystallised from methanol has a melting point of 260°-261° C. occurs from 70° C. this has finished after ca 30 minutes The mixture is stirred at 100° C. for a further 30 minutes the separated material is filtered off under suction The crystals are washed with water subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 39.5 g of 5-bromoisatoic acid anhydride and 14.5 g of sarcosine in 150 ml of dimethyl sulphoxide is heated to 100° C. while stirring. In so doing, a vigorous evolution of carbon dioxide occurs from 70° C. and this has finished after ca 30 minutes. The mixture is stirred at 100° C. for a further 30 minutes and thereafter the mixture is poured into 900 ml of ice-water (temperature 5° C.) and the separated material is filtered off under suction. The crystals are washed with water and subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione in the form of light beige crystals. A sample recrystallised from methanol has a melting point of 260°-261° C. occurs from 70° C. this has finished after ca 30 minutes The mixture is stirred at 100° C. for a further 30 minutes the separated material is filtered off under suction The crystals are washed with water subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 39.5 g of 5-bromoisatoic acid anhydride and 14.5 g of sarcosine in 150 ml of dimethyl sulphoxide is heated to 100° C. while stirring. In so doing, a vigorous evolution of carbon dioxide occurs from 70° C. and this has finished after ca 30 minutes. The mixture is stirred at 100° C. for a further 30 minutes and thereafter the mixture is poured into 900 ml of ice-water (temperature 5° C.) and the separated material is filtered off under suction. The crystals are washed with water and subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione in the form of light beige crystals. A sample recrystallised from methanol has a melting point of 260°-261° C. occurs from 70° C. this has finished after ca 30 minutes The mixture is stirred at 100° C. for a further 30 minutes the separated material is filtered off under suction The crystals are washed with water subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 39.5 g of 5-bromoisatoic acid anhydride and 14.5 g of sarcosine in 150 ml of dimethyl sulphoxide is heated to 100° C. while stirring. In so doing, a vigorous evolution of carbon dioxide occurs from 70° C. and this has finished after ca 30 minutes. The mixture is stirred at 100° C. for a further 30 minutes and thereafter the mixture is poured into 900 ml of ice-water (temperature 5° C.) and the separated material is filtered off under suction. The crystals are washed with water and subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione in the form of light beige crystals. A sample recrystallised from methanol has a melting point of 260°-261° C. occurs from 70° C. this has finished after ca 30 minutes The mixture is stirred at 100° C. for a further 30 minutes the separated material is filtered off under suction The crystals are washed with water subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 39.5 g of 5-bromoisatoic acid anhydride and 14.5 g of sarcosine in 150 ml of dimethyl sulphoxide is heated to 100° C. while stirring. In so doing, a vigorous evolution of carbon dioxide occurs from 70° C. and this has finished after ca 30 minutes. The mixture is stirred at 100° C. for a further 30 minutes and thereafter the mixture is poured into 900 ml of ice-water (temperature 5° C.) and the separated material is filtered off under suction. The crystals are washed with water and subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione in the form of light beige crystals. A sample recrystallised from methanol has a melting point of 260°-261° C. occurs from 70° C. this has finished after ca 30 minutes The mixture is stirred at 100° C. for a further 30 minutes the separated material is filtered off under suction The crystals are washed with water subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet

Conditions: temp:0.00; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A solution of 39.5 g of 5-bromoisatoic acid anhydride and 14.5 g of sarcosine in 150 ml of dimethyl sulphoxide is heated to 100° C. while stirring. In so doing, a vigorous evolution of carbon dioxide occurs from 70° C. and this has finished after ca 30 minutes. The mixture is stirred at 100° C. for a further 30 minutes and thereafter the mixture is poured into 900 ml of ice-water (temperature 5° C.) and the separated material is filtered off under suction. The crystals are washed with water and subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet. There is obtained 7-bromo-3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione in the form of light beige crystals. A sample recrystallised from methanol has a melting point of 260°-261° C. occurs from 70° C. this has finished after ca 30 minutes The mixture is stirred at 100° C. for a further 30 minutes the separated material is filtered off under suction The crystals are washed with water subsequently dried at 50° C. over phosphorus pentoxide in a vacuum drying cabinet