methyl 4-chloro-3-methyl-4-oxobutanoate

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

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

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

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

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

Procedure: Carbon disulfide (90 ml), 2-hydroxybenzimidazole (4.1 g) and 2-methyl-3-carbomethoxy propionyl chloride (5 g) are added to aluminum chloride (20.3 g) under nitrogen. The resulting mixture is refluxed for about 45 hours, quenched with ice cold 6N HCl and the acidic mixture filtered. The filtered solid is washed with water and dried in vacuo, affording the desired product as a solid, M.P. 223° C. (dec). The resulting mixture is refluxed for about 45 hours quenched with ice cold 6N HCl the acidic mixture filtered The filtered solid is washed with water dried in vacuo

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

Procedure: Carbon disulfide (90 ml), 2-hydroxybenzimidazole (4.1 g) and 2-methyl-3-carbomethoxy propionyl chloride (5 g) are added to aluminum chloride (20.3 g) under nitrogen. The resulting mixture is refluxed for about 45 hours, quenched with ice cold 6N HCl and the acidic mixture filtered. The filtered solid is washed with water and dried in vacuo, affording the desired product as a solid, M.P. 223° C. (dec). The resulting mixture is refluxed for about 45 hours quenched with ice cold 6N HCl the acidic mixture filtered The filtered solid is washed with water dried in vacuo

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

Procedure: 3,4-Dihydro-4-methyl-2(1H)-quinazolinone (3.9 g) is added to a stirred suspension of anhydrous aluminum chloride (16.5 g) in carbon disulfide (120 ml) under nitrogen. 3-Carbomethoxy-2-methyl-propionyl chloride (4 g) is added dropwise to the stirred suspension, which is refluxed for about 17 hours and cooled to RT. The liquid phase is decanted and the residue is treated with ice/H2O (150 ml) and extracted with methylene chloride. The organic extract is dried, filtered, and concentrated in vacuo, affording the desired crude product as an oil, which is used in the next step without further purification. is refluxed for about 17 hours The liquid phase is decanted the residue is treated with ice/H2O (150 ml) extracted with methylene chloride The organic extract is dried filtered concentrated in vacuo

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

Procedure: 3,4-Dihydro-3-methyl-2(1H)-quinazolinone (2.5 g) is added to a stirred suspension of anhydrous aluminum chloride (10.5 g) in carbon disulfide (120 ml) under nitrogen. 3-Carbomethoxy-2-methyl-propionyl chloride (2.5 g) is added dropwise to the stirred suspension, which is refluxed for about 18 hours and cooled to RT. The liquid phase is decanted and the residue treated with H2O (120 ml) and extracted with methylene chloride. The organic extract is dried, filtered and concentrated in vacuo, affording the desired product as a solid, which is used in the next step without further purification. is refluxed for about 18 hours The liquid phase is decanted the residue treated with H2O (120 ml) extracted with methylene chloride The organic extract is dried filtered concentrated in vacuo

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

Procedure: 3,4-Dihydro-3-methyl-2(1H)-quinazolinone (2.5 g) is added to a stirred suspension of anhydrous aluminum chloride (10.5 g) in carbon disulfide (120 ml) under nitrogen. 3-Carbomethoxy-2-methyl-propionyl chloride (2.5 g) is added dropwise to the stirred suspension, which is refluxed for about 18 hours and cooled to RT. The liquid phase is decanted and the residue treated with H2O (120 ml) and extracted with methylene chloride. The organic extract is dried, filtered and concentrated in vacuo, affording the desired product as a solid, which is used in the next step without further purification. is refluxed for about 18 hours The liquid phase is decanted the residue treated with H2O (120 ml) extracted with methylene chloride The organic extract is dried filtered concentrated in vacuo

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

Procedure: 3,4-Dihydro-1-methyl-2(1H)-quinazolinone (2.5 g) is added to a stirred suspension of anhydrous aluminum chloride (10.5 g) in carbon disulfide (120 ml) under nitrogen. 3-Carbomethoxy-2-methyl-propionyl chloride (2.5 g) is added dropwise to the stirred suspension, which is refluxed for about 18 hours and cooled to RT. The liquid phase is decanted and the residue treated with ice/H2O and 6N HCl (25 ml). The aqueous mixture is extracted with methylene chloride, the organic extract dried, filtered and concentrated in vacuo, affording the desired product as an oil which is used in the next step without further purification. is refluxed for about 18 hours The liquid phase is decanted the residue treated with ice/H2O and 6N HCl (25 ml) The aqueous mixture is extracted with methylene chloride the organic extract dried filtered concentrated in vacuo

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

Procedure: 3,4-Dihydro-2(1H)-quinazolinone (3.6 g) is added to a stirred suspension of anhydrous aluminum chloride (16.5 g) in carbon disulfide (120 ml) under nitrogen. 3-Carbomethoxy-2-methyl-propionyl chloride (4 g) is added dropwise to the stirred suspension, and the reaction mixture refluxed for about 18 hours, cooled to RT and further cooled to 0° C. in an ice bath. The liquid phase is decanted and ice and cold water slowly added to the residue. The aqueous mixture is filtered and the filtered solid suspended and stirred in the anhydrous diethyl ether overnight. The suspension is filtered and the filtered solid used in the next step without further purification. the reaction mixture refluxed for about 18 hours further cooled to 0° C. in an ice bath The liquid phase is decanted ice and cold water slowly added to the residue The aqueous mixture is filtered The suspension is filtered the filtered solid used in the next step without further purification

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

Procedure: 3,4-Dihydro-2(1H)-quinazolinone (3.6 g) is added to a stirred suspension of anhydrous aluminum chloride (16.5 g) in carbon disulfide (120 ml) under nitrogen. 3-Carbomethoxy-2-methyl-propionyl chloride (4 g) is added dropwise to the stirred suspension, and the reaction mixture refluxed for about 18 hours, cooled to RT and further cooled to 0° C. in an ice bath. The liquid phase is decanted and ice and cold water slowly added to the residue. The aqueous mixture is filtered and the filtered solid suspended and stirred in the anhydrous diethyl ether overnight. The suspension is filtered and the filtered solid used in the next step without further purification. the reaction mixture refluxed for about 18 hours further cooled to 0° C. in an ice bath The liquid phase is decanted ice and cold water slowly added to the residue The aqueous mixture is filtered The suspension is filtered the filtered solid used in the next step without further purification