Enantioselective Access to Triaryl-2-pyrones with Monoaxial or Contiguous C–C Diaxes via Oxidative NHC Catalysis
作者:Si-Chen Zhang、Shengping Liu、Xia Wang、Shao-Jie Wang、Hui Yang、Lin Li、Binmiao Yang、Ming Wah Wong、Yu Zhao、Shenci Lu
DOI:10.1021/acscatal.2c05570
日期:2023.2.17
materials. This N-heterocyclic carbene catalysis method adopts an atroposelective annulation of 2-aryketones with ynals under oxidative conditions. The annulation includes the construction of one or two axes in a single operation, achieves step economy, and affords axially chiral triaryl-2-pyrones in moderate to good yields, with high to excellent enantioselectivities. DFT calculations of the relative energies
我们在此展示了一种前所未有的立体选择性合成三芳基-2-吡喃酮的方法,该方法由现成的起始材料制成,具有单轴或连续双轴。这种N-杂环卡宾催化方法采用氧化条件下2-芳酮与炔烃的阻转选择性环化。环化包括在单个操作中构建一个或两个轴,实现步骤经济,并以中等至良好的收率提供轴向手性三芳基-2-吡喃酮,具有高至优异的对映选择性。对立体异构体和旋转势垒的相对能量进行了 DFT 计算。