Direct synthesis of 2-arylazulenes by [8+2] cycloaddition of 2<i>H</i>-cyclohepta[<i>b</i>]furan-2-ones with silyl enol ethers
作者:Taku Shoji、Shuhei Sugiyama、Yoshiaki Kobayashi、Akari Yamazaki、Yukino Ariga、Ryuzi Katoh、Hiroki Wakui、Masafumi Yasunami、Shunji Ito
DOI:10.1039/c9cc09376a
日期:——
We developed a procedure for the direct synthesis of 2-arylazulenes, which were obtained in moderate to excellent yields, by [8+2] cycloaddition of 2H-cyclohepta[b]furan-2-ones with aryl-substituted silyl enol ethers. The structures of some 2-arylazulenes were clarified by single-crystal X-ray analysis. The 2-phenylazulene derivatives obtained by this study showed noticeable fluorescence in acidic
我们开发了一种直接合成2-芳基azulenes的程序,该方法可以通过2H-环庚[b]呋喃-2-酮与芳基取代的甲硅烷基烯醇醚的[8 + 2]环加成反应而以中等至极好的收率获得。通过单晶X射线分析澄清了一些2-芳基az嗪的结构。通过该研究获得的2-苯基氮杂烯衍生物在酸性介质中显示出明显的荧光。