甲基 3-甲基-4-氧代丁酸乙酯

反应条件: temp:0.00; pressure:0.00; stir:

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: A mixture of methyl 3-methyl-4-oxo-butanoate (86.3 g), ethylene glycol (61.75 l g, 0.996 m), p-toluenesulfonic acid (1 g) and benzene (700 ml) is refluxed under nitrogen for 16 hr. The resulting mixture is allowed to cool to room temperature and treated with ether (300 ml). The organic phase is washed with 5% sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated in vacuo to give methyl 4,4-ethylenedioxy-3-methylbutanoate as a crude product (63.2 g). This material is used directly in the next step. is refluxed under nitrogen for 16 hr The organic phase is washed with 5% sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated in vacuo

反应条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of methyl 3-methyl-4-nitrobutanoate (96 g, 0.596 m) in methanol (30 ml) is added dropwise to a solution of sodium methoxide (34.5 g, 0.638 m) in methanol (1 l) at room temperature under nitrogen. The resulting mixture is stirred for 1 hr., cooled to -78° C. and treated with one equivalent of ozone. The reaction mixture is then allowed to warm to room temperature and most of the solvent is removed in vacuo. The residue is filtered and the filtrate is treated with ether (500 ml). The organic phase is washed with water (3×200 ml), dried (Na2SO4) and the solvent is removed in vacuo to give the crude product, methyl 3-methyl-4-oxo-butanoate (86.3 g). This material is used directly in the next step. to warm to room temperature and most of the solvent is removed in vacuo The residue is filtered the filtrate is treated with ether (500 ml) The organic phase is washed with water (3×200 ml) dried (Na2SO4) the solvent is removed in vacuo

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: A mixture of methyl 3-methyl-4-oxo-butanoate (86.3 g), ethylene glycol (61.75 l g, 0.996 m), p-toluenesulfonic acid (1 g) and benzene (700 ml) is refluxed under nitrogen for 16 hr. The resulting mixture is allowed to cool to room temperature and treated with ether (300 ml). The organic phase is washed with 5% sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated in vacuo to give methyl 4,4-ethylenedioxy-3-methylbutanoate as a crude product (63.2 g). This material is used directly in the next step. is refluxed under nitrogen for 16 hr The organic phase is washed with 5% sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated in vacuo

反应条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of methyl 3-methyl-4-nitrobutanoate (96 g, 0.596 m) in methanol (30 ml) is added dropwise to a solution of sodium methoxide (34.5 g, 0.638 m) in methanol (1 l) at room temperature under nitrogen. The resulting mixture is stirred for 1 hr., cooled to -78° C. and treated with one equivalent of ozone. The reaction mixture is then allowed to warm to room temperature and most of the solvent is removed in vacuo. The residue is filtered and the filtrate is treated with ether (500 ml). The organic phase is washed with water (3×200 ml), dried (Na2SO4) and the solvent is removed in vacuo to give the crude product, methyl 3-methyl-4-oxo-butanoate (86.3 g). This material is used directly in the next step. to warm to room temperature and most of the solvent is removed in vacuo The residue is filtered the filtrate is treated with ether (500 ml) The organic phase is washed with water (3×200 ml) dried (Na2SO4) the solvent is removed in vacuo

反应条件: temp:0.00; pressure:0.00; stir:

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

实验步骤: A mixture of methyl 3-methyl-4-oxo-butanoate (86.3 g), ethylene glycol (61.75 g, 0.996 m), p-toluenesulfonic acid (1 g) and benzene (700 ml) is refluxed under nitrogen for 16 hr. The resulting mixture is allowed to cool to room temperature and treated with ether (300 ml). The organic phase is washed with 5% sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated in vacuo to give methyl 4,4-ethylenedioxy-3-methyl-butanoate as a crude product (63.2 g). This material is used directly in the next step. is refluxed under nitrogen for 16 hr The organic phase is washed with 5% sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated in vacuo

反应条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of methyl 3-methyl-4-nitrobutanoate (96 g, 0.596 m) in methanol (30 ml) is added dropwise to a solution of sodium methoxide (34.5 g, 0.638 m) in methanol (1 l) at room temperature under nitrogen. The resulting mixture is stirred for 1 hr., cooled to -78° C. and treated with one equivalent of ozone. The reaction mixture is then allowed to warm to room temperature and most of the solvent is removed in vacuo. The residue is filtered and the filtrate is treated with ether (500 ml). The organic phase is washed with water (3×200 ml), dried (Na2SO4) and the solvent is removed in vacuo to give the crude product, methyl 3-methyl-4-oxo-butanoate (86.3 g). This material is used directly in the next step. to warm to room temperature and most of the solvent is removed in vacuo The residue is filtered the filtrate is treated with ether (500 ml) The organic phase is washed with water (3×200 ml) dried (Na2SO4) the solvent is removed in vacuo

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

实验步骤: A mixture of methyl 3-methyl-4-oxo-butanoate (86.3 g), ethylene glycol (61.75 g, 0.996 m), p-toluenesulfonic acid (1 g) and benzene (700 ml) is refluxed under nitrogen for 16 hours. The resulting mixture is allowed to cool to room temperature and treated with ether (300 ml). The organic phase is washed with 5% sodium bicarbonate solution (100 ml), dried (Na2SO4) and evaporated in vacuo to give methyl 4,4-ethylenedioxy-3-methylbutanoate as a crude product (63.2 g). This material is used directly in the next step. is refluxed under nitrogen for 16 hours The organic phase is washed with 5% sodium bicarbonate solution (100 ml) dried (Na2SO4) evaporated in vacuo

反应条件: temp:-78.01; pressure:0.00; stir:; See reaction.notes.procedure_details.

实验步骤: A solution of methyl 3-methyl-4-nitrobutanoate (96 g, 0.596 m) in methanol (30 ml) is added dropwise to a solution of sodium methoxide (34.5 g, 0.638 m) in methanol (1 l) at room temperature under nitrogen. The resulting mixture is stirred for 1 hour, cooled to -78° C. and treated with one equivalent of ozone. The reaction mixture is then allowed to warm to room temperature and most of the solvent is removed in vacuo. The residue is filtered and the filtrate is treated with ether (500 ml). The organic phase is washed with water (3×200 ml), dried (Na2SO4) and the solvent is removed in vacuo to give the crude product, methyl 3-methyl-4-oxo-butanoate (86.3 g). This material is used directly in the next step. to warm to room temperature and most of the solvent is removed in vacuo The residue is filtered the filtrate is treated with ether (500 ml) The organic phase is washed with water (3×200 ml) dried (Na2SO4) the solvent is removed in vacuo