Potassium <i>tert</i>-Butoxide Promoted Annulation of 2-Alkynylphenyl Propargyl Ethers: Selective Synthesis of Benzofuran and 12<i>H</i>-Benzoannulene Derivatives
作者:Tamiris B. Grimaldi、Davi F. Back、Gilson Zeni
DOI:10.1021/jo4020062
日期:2013.11.1
We present here our results on potassium tert-butoxide promoted annulation reactions of 2-alkynylphenyl propargyl ethers to give two different types of heterocycles: 3-benzyl-2-alkynylbenzofurans and 12H-benzoannulenbenzo[b]furans. A series of functionalized 2-alkynylphenyl propargyl ethers were efficiently cyclized by potassium tert-butoxide to the corresponding products. The optimized reaction conditions
我们在这里介绍关于叔丁醇钾促进的2-炔基苯基炔丙基醚的环化反应以产生两种不同类型的杂环的结果:3-苄基-2-炔基苯并呋喃和12 H-苯并环戊并苯并[ b ]呋喃。叔丁基钾有效地环化了一系列官能化的2-炔基苯基炔丙基醚-丁氧化物制得相应产物。优化的反应条件可耐受多种官能团,包括富电子,贫电子和N杂环底物。通过控制溶剂和温度获得选择性的产物形成。当在室温下使用THF时,只能获得3-苄基-2-炔基苯并呋喃衍生物,而在60°C下使用DMF时,则可以选择性地生成12 H-苯并环戊烯[ b ]苯并呋喃。