反应详情

温度

100 °C

The compounds of this invention are prepared as shown in the following reaction scheme: ##STR2## in which R1 and R2 are as defined in formula I. Thus, as shown above, a 3-coumaranone is reacted with an appropriately substituted benzaldehyde and acetic anhydride by heating at a temperature up to about 100° C. for from 1 to 3 hours. The reaction mixture is treated with ice, extracted with a nonreactive organic solvent such as ether and the product from the extract is heated at reflux for about one hour with a mineral acid, such as hydrochloric acid, an alkanol such as methanol or ethanol, and water. Cooling gives the substituted aurone product.

1. customThe compounds of this invention are prepared
2. customas shown in the following reaction scheme
3. additionThe reaction mixture is treated with ice
4. extractionextracted with a nonreactive organic solvent such as ether
5. temperaturethe product from the extract is heated
6. temperatureat reflux for about one hour with a mineral acid, such as hydrochloric acid
7. temperatureCooling