Synthetic Applications of Oxime-Derived Palladacycles as Versatile Catalysts in Cross-Coupling Reactions

Abstract

Palladacycles 1 and 2, derived from 4,4′-dichlorobenzophenone and 4-hydroxyacetophenone oximes, respectively, are very efficient and versatile pre-catalysts for a wide range of carbon-carbon bond coupling reactions such as, Mizoroki-Heck, Suzuki-Miyaura, Stille, Ullmann-type, Sonogashira, sila-Sonogashira, Glaser and acylation of alkynes under very low loading conditions in air and either in organic or aqueous solvents, employing reagent-grade chemicals. High yielding, general, and practical procedures for the palladium-catalyzed Mizoroki-Heck, Suzuki-Miyaura, Ullmann-type, Sonogashira and sila-Sonogashira reactions are described.

Key words

cross-coupling - palladacycles - Heck reaction - biaryls - alkynes

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Commercially available compound.