4'-Methoxyacetophenone → Methyl 4-methoxy-beta-oxobenzenepropanoate

Beteiligte Stoffe

Reaktionsbedingungen

Reaktionsschritte

30.7 g of sodium was added to 300 ml of toluene, and the mixture was heated to 93° C., followed by cooling while vigorous stirring, to give sandy products. To the product, 600 ml of toluene containing 300 g of dimethyl carbonate was added, and further 250 ml of a toluene solution containing 100 g of p-methoxyacetophenone was added dropwise over 2 hours and 15 minutes at 84° to 86° C. After the dropwise addition, the mixture was stirred under heating at 82° to 83° C. for 1.5 hours, and then the solvent was evaporated. To the residue was added 1 l of isopropyl ether, and crystals were collected by filtration and washed with 500 ml of isopropyl ether. These crystals were added to a mixture of ice and ethyl acetate containing 100 g of acetic acid, and extracted with ethyl acetate. The extract was washed with 5 % sodium hydrogen carbonate and then with water, and dried. Subsequently, the solvent was evaporated to obtain 131.6 g of methyl 3-oxo-3-(p-methoxyphenyl)propionate as an oily product.

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