Domino approach to benzofurans by the sequential sonogashira/ hydroalkoxylation couplings catalyzed by new N-heterocycliccarbene-palladium complexes
Organometallics, ISSN: 0276-7333, Vol: 28, Issue: 15, Page: 4335-4339
2009
- 125Citations
- 35Captures
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Article Description
A set of three different NHC-Pd-pyridine complexes (NHC = 1,2,4-trimethyltriazolyldiylidene, 1,3-dimethylimidazolylidene, and 1,4-dimethyltriazolylidene) have been prepared and fully characterized. The X-ray molecular structures of two of the complexes are reported. The three complexes have been tested in a series of reactions between o-hydroxyaryl halides and phenylacetylene to afford benzofurans, in a tandem process that comprises a Sonogashira coupling followed by a cyclic hydroalkoxylation. All three catalysts afforded excellent yields of the final products when the corresponding iodoarenes were used. © 2009 American Chemical Society.
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