Abstract
The Pd-catalyzed cross-coupling of cyclic thioamides and thioureas with alkenylboronic acids, vinyl- and (het)arylstannanes, and arylsiloxanes in the presence of stoichiometric amounts of a Cu(I) cofactor is described. The desulfitative C-C cross-coupling protocol of the Liebeskind-Srogl type is performed under neutral conditions and can be applied to a range of heterocyclic structures with embedded thioamide fragments. Employing controlled microwave irradiation at 100 degrees C utilizing either a single-mode reactor or a multimode parallel reaction platform, cross-couplings can generally be completed within 1-3 h and proceed in good yields.
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