Redesign of a Pyrylium Photoredox Catalyst and Its Application to the Generation of Carbonyl Ylides

Organic Letters
Edwin AlfonzoAaron B Beeler

Abstract

We report the exploration into photoredox generation of carbonyl ylides from benzylic epoxides using newly designed 4-mesityl-2,6-diphenylpyrylium tetrafluoroborate (MDPT) and 4-mesityl-2,6-di-p-tolylpyrylium tetrafluoroborate (MD(p-tolyl)PT) catalysts. These catalysts are excited at visible wavelengths, are highly robust, and exhibit some of the highest oxidation potentials reported. Their utility was demonstrated in the mild and efficient generation of carbonyl ylides from benzylic epoxides that otherwise could not be carried out by current common photoredox catalysts.

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Citations

Jun 25, 2018·Angewandte Chemie·Alexey O ChagarovskiyIgor V Trushkov
Aug 30, 2019·Angewandte Chemie·Rick C BetoriKarl A Scheidt
Sep 27, 2018·Beilstein Journal of Organic Chemistry·Edwin AlfonzoAaron B Beeler

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