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: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H,4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 1.1 g. of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 300 ml of 89 percent nitric acid are treated portionwise at room temperature over a period of 35 minutes with 94.5 g (496.8 mmol) of 3,4-dihydro-4-methyl-2H-1,4-benzodiazepine-2,5(1H)-dione. The mixture is stirred at room temperature for 18 hours and poured into 3.5 l of ice-water. The precipitated material is filtered off under suction, washed with water and dried at 70° in vacuo. There is obtained 3,4-dihydro-4-methyl-7-nitro-2H-1,4-benzodiazepine-2,5(1H)-dione of melting point 252°-253°. The precipitated material is filtered off under suction washed with water dried at 70° in vacuo

Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 16.5 g of 4-methyl-3,4-dihydro-2H-1,4-benzodiazepine-2,5(1H)-dione and 11.7 g of K-t-butoxide was dissolved in 100 ml of dry dimethyl formamide (DMF) and the mixture was stirred for 10 minutes. Then 13.2 ml of diethylchlorophosphate was added and the resulting mixture was cooled to -20° C. and stirred for 10 minutes. A mixture of 10.8 g K-t-butoxide and 10.5 ml ethyl isocyanoacetate in 30 ml of dry DMF was added to the above prepared mixture at -10° to --20° C. and the resulting mixture was stirred for one hour at RT, whereafter it was poured into 8.7 ml acetic acid in 300 ml water. This mixture was extracted 2 times with 150 ml methylene chloride. The organic phase was dried and evaporated. The resulting residue was crystallized leaving 10 g of the title compound as crystals. stirred for 10 minutes was added to the above prepared mixture at -10° to --20° C. the resulting mixture was stirred for one hour at RT, whereafter it This mixture was extracted 2 times with 150 ml methylene chloride The organic phase was dried evaporated The resulting residue was crystallized

Conditions: temp:-20.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: 16.5 g of 4-methyl-3,4-dihydro-2H-1,4-benzodiazepine-2,5(1H)-dione and 11.7 g of K-t-butoxide was dissolved in 100 ml of dry dimethyl formamide (DMF) and the mixture was stirred for 10 minutes. Then 13.2 ml of diethylchlorophosphate was added and the resulting mixture was cooled to -20° C. and stirred for 10 minutes. A mixture of 10.8 g K-t-butoxide and 10.5 ml ethyl isocyanoacetate in 30 ml of dry DMF was added to the above prepared mixture at -10° to --20° C. and the resulting mixture was stirred for one hour at RT, whereafter it was poured into 8.7 ml acetic acid in 300 ml water. This mixture was extracted 2 times with 150 ml methylene chloride. The organic phase was dried and evaporated. The resulting residue was crystallized leaving 10 g of the title compound as crystals. stirred for 10 minutes was added to the above prepared mixture at -10° to --20° C. the resulting mixture was stirred for one hour at RT, whereafter it This mixture was extracted 2 times with 150 ml methylene chloride The organic phase was dried evaporated The resulting residue was crystallized

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

Procedure: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)

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

Procedure: 1.1 g of sodium hydride dispersion (60%) are suspended in 50 ml of DMF. 5.23 g of 4-methyl-3H-1,4-benzodiazepine-2,5(1H, 4H)-dione are added thereto so that the temperature does not exceed 35° C. and the mixture is stirred at room temperature for 90 minutes. Subsequently, a solution of 5.3 g of t-butyl (S)-2,2-dimethyl-4-(p-tolylsulfonyloxymethyl)-3-oxazolidinecaboxylate (Example 6a) in 50 ml of DMF is added thereto and the mixture is stirred at 50° C. overnight. The reaction mixture is evaporated and the residue is taken up in ethyl acetate, washed with water and dried. After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1). There are obtained 1.85 g of t-butyl (R)-(2,3,4,5-tetrahydro-4-methyl-2,5-dioxo-1H-1,4-benzodiazepin-1-ylmethyl)-2,2-dimethyl-3-oxazolidinecarboxylate. does not exceed 35° C. the mixture is stirred at 50° C. overnight The reaction mixture is evaporated washed with water dried After evaporation of the solvent the residue is purified over silica gel with ethyl acetate/hexane (1:1)