4.8 Article

Visible-light-driven spirocyclization of epoxides via dual titanocene and photoredox catalysis

Journal

CHEMICAL SCIENCE
Volume 11, Issue 3, Pages 839-844

Publisher

ROYAL SOC CHEMISTRY
DOI: 10.1039/c9sc05601g

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Funding

  1. Fundamental Research Funds for the Central Universities [DUT19LK31]

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We describe the synergistic utilization of titanocene/photoredox dual catalysis driven by visible light for the radical opening/spirocyclization of easily accessible epoxyalkynes. This environmentally benign process uses the organic donor-acceptor fluorophore 2,4,5,6-tetra(9H-carbazol-9-yl)isophthalonitrile (4CzIPN) as a photocatalyst and Hantzsch ester (HE) as an electron donor instead of stoichiometric metallic reductants. The photocatalytic conditions showed exceptionally high reactivity for the synthesis of privileged and synthetically challenging spirocycles featuring a spiro all-carbon quaternary stereocenter. Cyclic voltammetry (CV) studies suggest that (Cp2TiCl)-Cl-III is the catalytically active species.

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