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.
含有噻吩环的查尔酮衍生物通过3-乙酰基噻吩与芳香醛的缩合反应制备,产率优异。在固体NaOH存在的CH2Cl2中,将乙酰乙酸乙酯加入查尔酮衍生物3a-3h中,结果形成了双环内酯衍生物5a-5h和6-(乙氧羰基)环己烯酮衍生物6a-6h的混合物。