diethyl 2-hydroxyiminopropanedioate

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: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). A solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) was added dropwise to the solution over 40 minutes at 5° C in a nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. A solution of 4-methoxybenzylalcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) was added dropwise to the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate over a period of 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was then washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying, the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), a pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken The organic layer was then washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off

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

Procedure: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). To the solution was dropwise added a solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) over 40 minutes at 5° C in nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. To the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate was dropwise added a solution of 4-methoxybenzyl alcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) over 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was in turn washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off

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

Procedure: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). To the solution was dropwise added a solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) over 40 minutes at 5° C in nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. To the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate was dropwise added a solution of 4-methoxybenzyl alcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) over 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was in turn washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off

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: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). A solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) was added dropwise to the solution over 40 minutes at 5° C in a nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. A solution of 4-methoxybenzylalcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) was added dropwise to the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate over a period of 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was then washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying, the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), a pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken The organic layer was then washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off

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

Procedure: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). A solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) was added dropwise to the solution over 40 minutes at 5° C. in a nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. A solution of 4-methoxybenzylalcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) was added dropwise the the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate over a period of 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1 N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was then washed 3 times with 1 N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying, the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), a pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken The organic layer was then washed 3 times with 1 N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off

Conditions: temp:0.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

Procedure: A mixture of diethyl 2-hydroxyiminomalonate (18.9 g), water (50 ml) and acetone (8 ml) is cooled at 0°C, and ethyl chloroformate (9.8 g) is dropwise added thereto. The resulting mixture is, after adjusted to pH 7 to 8 with the addition of an aqueous solution of sodium hydrogencarbonate, stirred at room temperature for 4 hours. The reaction mixture is extracted with ether, and the ether layer is washed with an aqueous solution of sodium chloride, dried and concentrated to give diethyl 2-ethoxycarbonyloxyiminomalonate (24 g) as an oil. The reaction mixture is extracted with ether the ether layer is washed with an aqueous solution of sodium chloride dried concentrated

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

Procedure: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). A solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) was added dropwise to the solution over 40 minutes at 5° C in a nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. A solution of 4-methoxybenzylalcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) was added dropwise to the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate over a period of 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was then washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying, the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), a pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken The organic layer was then washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off

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

Procedure: Benzene (20 ml.) was added to a solution of phosgene 2.5 g.) in benzene (11.4 ml.). To the solution was dropwise added a solution of diethyl 2-hydroxyiminomalonate (4.73 g.) and N,N-dimethylaniline (3.03 g.) in benzene (30 ml.) over 40 minutes at 5° C in nitrogen stream. The mixture was stirred for 1 hour at the same temperature and overnight at room temperature. To the resultant mixture containing diethyl 2-chlorocarbonyloxyiminomalonate was dropwise added a solution of 4-methoxybenzyl alcohol (3.11 g.) and pyridine (4.04 ml.) in benzene (30 ml.) over 40 minutes at 5° C. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature and allowed to stand overnight. Cold water (100 ml.) was added to the reaction mixture to dissolve an insoluble material and cooled 1N-hydrochloric acid (20 ml.) was added thereto, after which the mixture was shaken. The organic layer was in turn washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) and a sodium chloride aqueous solution, and then dried over magnesium sulfate. After drying the solvent was distilled off to give diethyl 2-(4-methoxybenzyloxycarbonyloxyimino)malonate (6.89 g.), pale brown oil, which was solidified on standing at ambient temperature. The mixture was stirred for 2 hours at the same temperature, for 3 hours at room temperature to stand overnight to dissolve an insoluble material was added after which the mixture was shaken washed 3 times with 1N hydrochloric acid (20 ml.), 3 times with a 5% sodium carbonate aqueous solution (20 ml.) a sodium chloride aqueous solution, and then dried over magnesium sulfate After drying the solvent was distilled off