2,4-二氧代壬酸乙酯

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

实验步骤: A mixture of 38 g of ethyl hexanoylpyruvate in 190 ml of ethanol in the presence of 14.4 g of hydroxylamine hydrochloride and 16 g of sodium hydrogencarbonate was heated under reflux for 3 hours. After the reaction mixture was cooled to room temperature, the insoluble materials were separated by filtration, and the remaining filtrate was concentrated. The resulting residue was dissolved in chloroform (500 ml), which was washed with water, concentrated to give 5-pentyl-3-carboethoxyisoxazole as a liquid (36 g). was heated under reflux for 3 hours the insoluble materials were separated by filtration the remaining filtrate was concentrated The resulting residue was dissolved in chloroform (500 ml) which was washed with water concentrated

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

实验步骤: A mixture of 38 g of ethyl hexanoylpyruvate in 190 ml of ethanol in the presence of 14.4 g of hydroxylamine hydrochloride and 16 g of sodium hydrogencarbonate was heated under reflux for 3 hours. After the reaction mixture was cooled to room temperature, the insoluble materials were separated by filtration, and the remaining filtrate was concentrated. The resulting residue was dissolved in chloroform (500 ml), which was washed with water, concentrated to give 5-pentyl-3-carboethoxyisoxazole as a liquid (36 g). was heated under reflux for 3 hours the insoluble materials were separated by filtration the remaining filtrate was concentrated The resulting residue was dissolved in chloroform (500 ml) which was washed with water concentrated

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

实验步骤: 4.7 g of sodium metal was dissolved in 92 ml of ethanol. A mixture of 20 g of 2-heptanone and 26 g of diethyl oxalate was dropwise added thereto at 0° C. After the removing the ice bath, the reaction mixture was stirred at room temperature for 3 hours. After evaporation of the reaction mixture, 200 ml of water was added to the resulting syrup, and then an aqueous 10% hydrochloric acid was added with ice-cooling, the pH being adjusted to 1. After extraction with benzene (300 ml×3), the organic layer was washed with 100 ml of water, dried with Glauber's salt (Na2SO4). And concentrated to give ethyl hexanoylpyruvate as a liquid (38 g). was dropwise added at 0° C After evaporation of the reaction mixture, 200 ml of water was added to the resulting syrup an aqueous 10% hydrochloric acid was added with ice- cooling After extraction with benzene (300 ml×3) the organic layer was washed with 100 ml of water dried with Glauber's salt (Na2SO4) And concentrated

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

实验步骤: A mixture of 38 g of ethyl hexanoylpyruvate in 190 ml of ethanol in the presence of 14.4 g of hydroxylamine hydrochloride and 16 g of sodium hydrogencarbonate was heated under reflux for 3 hours. After the reaction mixture was cooled to room temperature, the insoluble materials were separated by filtration, and the remaining filtrate was concentrated. The resulting residue was dissolved in chloroform (500 ml), which was washed with water, concentrated to give 5-pentyl-3-carboethoxyisoxazole as a liquid (36 g). was heated under reflux for 3 hours the insoluble materials were separated by filtration the remaining filtrate was concentrated The resulting residue was dissolved in chloroform (500 ml) which was washed with water concentrated

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

实验步骤: 4.7 g of sodium metal was dissolved in 92 ml of ethanol. A mixture of 20 g of 2-heptanone and 26 g of diethyl oxalate was dropwise added thereto at 0° C. After the removing the ice bath, the reaction mixture was stirred at room temperature for 3 hours. After evaporation of the reaction mixture, 200 ml of water was added to the resulting syrup, and then an aqueous 10% hydrochloric acid was added with ice-cooling, the pH being adjusted to 1. After extraction with benzene (300 ml×3), the organic layer was washed with 100 ml of water, dried with Glauber's salt (Na2SO4). And concentrated to give ethyl hexanoylpyruvate as a liquid (38 g). was dropwise added at 0° C After evaporation of the reaction mixture, 200 ml of water was added to the resulting syrup an aqueous 10% hydrochloric acid was added with ice- cooling After extraction with benzene (300 ml×3) the organic layer was washed with 100 ml of water dried with Glauber's salt (Na2SO4) And concentrated