Palladium-catalyzed three-component cascade arylthiolation with aryldiazonium salts as S-arylation sources?
Organic & Biomolecular Chemistry Pub Date: 2020-05-11 DOI: 10.1039/D0OB00828A
Abstract
A novel and efficient palladium-catalyzed three-component cascade cyclization/arylthiolation has been developed for the assembly of diverse 3-sulfenylindole and 3-sulfenylbenzofuran derivatives from 2-alkynylamines and 2-alkynylphenols, aryldiazonium salts, and Na2S2O3 under aerobic conditions with PEG-200 as an environmentally benign medium. The current study features exceptional functional group tolerance without additional ligands, oxidants or silver salts, and eco-friendly mild reaction conditions. The ionic liquid [C2OHmim]Cl plays a crucial role in this protocol as an environmentally friendly additive. Notably, this procedure represents the first example of the use of aryldiazonium salts as direct S-arylation sources in this type of chemical transformation.
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Journal Name：Organic & Biomolecular Chemistry
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CAS no.: 89640-58-4
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