Selective transformations of alkynes with ruthenium catalysts

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Abstract
The electrophilic activation of terminal alkynes by suitable ruthenium(II) catalyst precursors has provided selective access to enol esters, functional dienes, ketoesters and furans. The step-by-step modification of the ligands of simple complexes such as (arene)RuCl 2 (PR 3 ), [Ru(µ-O 2 CH)(CO) 2 (PR 3 )] 2 or (diphosphine)Ru(allyl) 2 , has allowed the determination of efficient catalytic conditions for regio- and stereo-selective additions to alkynes. The utilization of electron-rich ruthenium(II) complexes containing the bulky pentamethylcyclopentadienyl ligand, has made possible the catalytic carbon–carbon bond forming reaction from alkynes and allyl alcohol to give unsaturated aldehydes.

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