Photochemical reactions follow a mechanistic pathway that allows access to high-energy intermediates. UV light catalyzed reactions have short-lived, highly reactive excited states, which often impede selectivity. With the use of lower energy visible light and transition metal photocatalysts, [2 + 2] cycloadditions of substituted alkenes have been reported. Our work focuses on the triplet energy transfer from iridium polypyridyl complexes and vinylogous ester and amide substrates under blue-light irradiation. The intermolecular cycloaddition of oxazinone and dioxenone derivatives with acyclic enones proceeds in with good regio- and stereoselectivity.

Visible light photocatalytic methods for the [2 + 2] cycloaddition of dioxenone and oxazinone chromophores

256th National Meeting (2018)

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