Direct conversion of carboxylic acids to free thiols radical relay acridine photocatalysis enabled by N-O bond cleavage

Carboxylic acids and thiols are basic chemical compounds with diverse utility and widespread reactivity. However, the direct conversion of unprotected acids to thiols is hampered due to a fundamental problem - free thiols are incompatible with the alkyl radicals formed on decarboxylation of carboxyl...

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Veröffentlicht in:Chemical science (Cambridge) 2024-01, Vol.15 (2), p.644-65
Hauptverfasser: Lipilin, Dmitry L, Zubkov, Mikhail O, Kosobokov, Mikhail D, Dilman, Alexander D
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Zusammenfassung:Carboxylic acids and thiols are basic chemical compounds with diverse utility and widespread reactivity. However, the direct conversion of unprotected acids to thiols is hampered due to a fundamental problem - free thiols are incompatible with the alkyl radicals formed on decarboxylation of carboxylic acids. Herein, we describe a concept for the direct photocatalytic thiolation of unprotected acids allowing unprotected thiols and their derivatives to be obtained. The method is based on the application of a thionocarbonate reagent featuring the N-O bond. The reagent serves both for the rapid trapping of alkyl radicals and for the facile regeneration of the acridine-type photocatalyst. A method for the one pot conversion of acids to free thiols is described. The reaction is based on the ability of a novel sulfur reagent to maintain regeneration of the acridine photocatalyst.
ISSN:2041-6520
2041-6539
DOI:10.1039/d3sc05513b