photocyclization of diarylethenes (DAE) under UV irradiation is proposed. The reaction proceeds through 6π-electrocyclization with the formation of a cyclic (closed) intermediate that undergoes a rearrangement affording unsymmetrical phenanthrenes in good yields. However, in contrast to benzene derivatives, the photocyclization of naphthalene diarylethenes proceeds more slowly, which is confirmed by DFT
提出了在紫外光下通过双环
芳烃(
DAE)的光环化合成功能化
菲的新方法。该反应通过6π-电环化进行,形成环状(封闭的)中间体,该中间体进行重排,从而以良好的收率得到不对称的
菲。然而,与苯衍
生物相比,
萘二芳基
蒽的光环化进行得更慢,这通过DFT计算得到了证实。转化以1mmol规模进行。可扩展性表明,带有
恶唑,
噻唑,
吡唑和
咪唑作为芳基的二
芳烃更易发生光重排,可用于制备有机合成。