Jin W, Yu S. Photoexcited Palladium-Initiated Remote Desaturation of
N-Alkoxypyridinium Salts.
J Org Chem 2022;
87:14715-14722. [PMID:
36219516 DOI:
10.1021/acs.joc.2c02036]
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Abstract
1,5-Hydrogen atom transfer (HAT) is an effective strategy to achieve remote desaturation of nonfunctionalized alkanes. Herein, we report a photoinduced remote desaturation reaction of N-alkoxypyridinium salts, which serve as alkoxyl radical precursors. Mechanistic studies show that a single electron transfer between the excited palladium complex and a N-alkoxypyridinium salt initiates a radical chain process leading to desaturation of N-alkoxypyridinium salts. This chain mechanism is supported by the measurement of the quantum yield of this reaction (Φ = 82). This reaction is applicable to a range of N-alkoxypyridinium salts, including some complex molecule-derived ones.
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