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This chapter covers recent developments in transition metal catalyzed cycloadditions involving alkynes. Late transition metals are the catalysts of choice for these cascades allowing a straightforward access to molecular complexity from acyclic precursors. This overview covers both mechanistic aspects and synthetic applications of this vast and fruitful domain.
Alkynyl chlorides, bromides, and iodides have been tested as [2 + 2 + 2] cycloaddition partners using CpCo(CO)(dimethylfumarate) and Cp*Ru(cod)Cl as precatalysts. A series of cocyclizations between diynyl dihalides and alkynes, as well as intramolecular cycloadditions of triynyl dihalides, has been carried out. While this study confirmed the versatility of the ruthenium complex with all kinds of halides,...
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