Metallaphotoredox deuteroalkylation utilizing thianthrenium salts

Mengjie Jiao, Jie Zhang, Minyan Wang, Hongjian Lu () and Zhuangzhi Shi ()
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Mengjie Jiao: Nanjing University
Jie Zhang: Nanjing University
Minyan Wang: Nanjing University
Hongjian Lu: Nanjing University
Zhuangzhi Shi: Nanjing University

Nature Communications, 2024, vol. 15, issue 1, 1-11

Abstract: Abstract Deuterium labeling compounds play a crucial role in organic and pharmaceutical chemistry. The synthesis of such compounds typically involves deuterated building blocks, allowing for the incorporation of deuterium atoms and functional groups into a target molecule in a single step. Unfortunately, the limited availability of synthetic approaches to deuterated synthons has impeded progress in this field. Here, we present an approach utilizing alkyl-substituted thianthrenium salts that efficiently and selectively introduce deuterium at the α position of alkyl chains through a pH-dependent HIE process, using D2O as the deuterium source. The resulting α-deuterated alkyl thianthrenium salts, which bear two deuterium atoms, exhibit excellent selectivity and deuterium incorporation in electrophilic substitution reactions. Through in situ formation of isotopically labelled alkyl halides, these thianthrenium salts demonstrate excellent compatibility in a series of metallaphotoredox cross-electrophile coupling with (hetero)aryl, alkenyl, alkyl bromides, and other alkyl thianthrenium salts. Our technique allows for a wide range of substrates, high deuterium incorporation, and precise control over the site of deuterium insertion within a molecule such as the benzyl position, allylic position, or any alkyl chain in between, as well as neighboring heteroatoms. This makes it invaluable for synthesizing various deuterium-labeled compounds, especially those with pharmaceutical significance.

Date: 2024
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DOI: 10.1038/s41467-024-48590-w

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