<p>The insertion of either C−H bond or C−O bond via bond cleavage has proven to be a very attractive strategy for the construction of C−C and C−O bonds in organic synthesis. However, such divergent catalytic asymmetric reactions for the selective formation of C(sp<sup>3</sup>)−H insertion and formal C(sp<sup>3</sup>)−O insertion products from the same precursors are rarely explored. Herein, we report a ligand-controlled divergent asymmetric C(sp<sup>3</sup>)−H insertion and formal C(sp<sup>3</sup>)−O insertion reaction via vinyl cations by a non-diazo approach, leading to the practical and atom-economical assembly of a range of chiral spiro and fused polycyclic pyrroles in generally moderate to excellent yields with generally excellent chemo- and enantioselectivities. Importantly, this protocol not only represents a rare example of successful ligand-controlled asymmetric divergent insertion reaction, but also constitutes an enantioselective 1,6-C−H insertion and an asymmetric carbenoid insertion into acetals via a non-diazo approach.</p>

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Ligand-controlled divergent asymmetric C(sp3)−H and C(sp3)−O insertion via vinyl cations

  • Cui-Ting Li,
  • Li-Gao Liu,
  • Jia-Zheng Li,
  • Hao-Xuan Dong,
  • Roman A. Novikov,
  • Ze-Shu Wang,
  • Xin Hong,
  • Bo Zhou,
  • Long-Wu Ye

摘要

The insertion of either C−H bond or C−O bond via bond cleavage has proven to be a very attractive strategy for the construction of C−C and C−O bonds in organic synthesis. However, such divergent catalytic asymmetric reactions for the selective formation of C(sp3)−H insertion and formal C(sp3)−O insertion products from the same precursors are rarely explored. Herein, we report a ligand-controlled divergent asymmetric C(sp3)−H insertion and formal C(sp3)−O insertion reaction via vinyl cations by a non-diazo approach, leading to the practical and atom-economical assembly of a range of chiral spiro and fused polycyclic pyrroles in generally moderate to excellent yields with generally excellent chemo- and enantioselectivities. Importantly, this protocol not only represents a rare example of successful ligand-controlled asymmetric divergent insertion reaction, but also constitutes an enantioselective 1,6-C−H insertion and an asymmetric carbenoid insertion into acetals via a non-diazo approach.