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Updated: Jul 8, 2025

A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
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A Platform for the Liebeskind-Srogl Coupling of Heteroaromatic Thioethers for Medicinal-Chemistry-Relevant
Victor Koolma1, Roman Staiger1, Martin Schühle1
1Boehringer Ingelheim Pharma GmbH & Co. KG, 88400, Biberach an der Riss, Germany.
Abstract:
General and robust conditions for the Liebeskind-Srogl coupling were developed and used in functionalization of medicinal-chemistry-relevant heterocyclic substrates. Applicability in HTE and library synthesis, combined with its orthogonality to other cross-coupling reactions, make it highly attractive for discovery chemistry workflows. Additionally, the results suggest that the nature of the Cu(I)-carboxylate plays a more prominent role in the reaction performance than the nature of Pd-catalysts, which is rather uncommon for Pd-catalysis and can be used in further optimization of Liebeskind-Srogl coupling.
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