Unexpected lactonization accompanying addition of ethyl acetoacetate to chalcones derived from 3-acetylthiophene
作者:Yakup Budak、Esra Findik
DOI:10.1135/cccc2010150
日期:——
Chalcone derivatives containing thiophene ring were prepared by the condensation of 3-acetylthiophene with aromatic aldehydes in excellent yields. The addition of ethyl acetoacetate to chalcone derivatives 3a–3h in the presence of solid NaOH in CH2Cl2 resulted in the formation of the mixture of bicyclic lactone derivatives 5a–5h and 6-(ethoxycarbonyl)cyclohexenone derivatives 6a–6h.