作者:Kamauchi, Hitoshi、Goto, Miki、Sugita, Yoshiaki
DOI:10.1021/acs.joc.4c00911
日期:——
The synthesis of daldinans B and E (5 and 8), 3-phenyl isoindolinones isolated from Daldinia concentrica, was achieved. The conformational properties of these isoindolinones were examined using their derivatives, revealing the presence of atropisomers. The activation free-energy barrier was estimated by the variable-temperature nuclear magnetic resonance (VT-NMR) method, and density functional theory
完成了从Daldinia concentrica中分离出的 3-苯基异吲哚啉酮 daldinans B 和 E( 5和8 )的合成。使用它们的衍生物检查了这些异吲哚啉酮的构象特性,揭示了阻转异构体的存在。通过变温核磁共振(VT-NMR)方法估计了活化自由能垒,密度泛函理论(DFT)计算表明这种阻转异构化是由绕C-3-C缓慢旋转的平衡引起的-8轴。