Cascade Pd-Catalyzed Azide-Isocyanide Cross Coupling/Cyclization/Lactamization Reactions for the Synthesis of Tricyclic Guanidine-Containing Polyheterocycles

A one-pot synthesis of a tricyclic guanidine scaffold is developed. The azido-bearing [3 + 2] adducts are used for cascade azide-isocyanide cross-coupling/nucleophilic cyclization/lactamization to afford highly condensed polyheterocycles. A wide range of azido-containing [3 + 2] adducts and isocyanides are tolerated in the sequential reactions.

Guanidinates as Alternative Ligands for Organometallic Complexes

For decades, ligands such as phosphanes or cyclopentadienyl ring derivatives have dominated Coordination and Organometallic Chemistry. At the same time, alternative compounds have emerged that could compete either for a more practical and accessible synthesis or for greater control of steric and electronic properties. Guanidines, nitrogen-rich compounds, appear as one such potential alternatives as ligands or proligands. In addition to occurring in a plethora of natural compounds, and thus in compounds of pharmacological use, guanidines allow a wide variety of coordination modes to different metal centers along the periodic table, with their monoanionic chelate derivatives being the most common. In this review, we focused on the organometallic chemistry of guanidinato compounds, discussing selected examples of coordination modes, reactivity and uses in catalysis or materials science. We believe that these amazing ligands offer a new promise in Organometallic Chemistry.

The chemistry and biology of guanidine natural products

The present review discusses the isolation, structure determination, synthesis, biosynthesis and biological activities of secondary metabolites bearing a guanidine group.

The Chemistry of Guanidine, Guanidinium, and Guanidinate Compounds

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