Journal
ORGANIC LETTERS
Volume 5, Issue 18, Pages 3317-3319Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ol035147k
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- NIGMS NIH HHS [GM57275] Funding Source: Medline
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[GRAPHICS] Bulky phenanthracenyl imidazolium-derived carbene ligands were investigated for copper-free Sonogashira coupling with terminal acetylenes. Aryl bromides and iodides gave coupled products in excellent yields from the Pd(PPh3)(2)Cl-2 complex with potassium t-butoxide and 18-crown-6 in THF. A remarkable dependence on the size of the ligand was found. The highest yields were obtained with the bulky 2,9-dicyclohexyl-10-phenanthryl ligand 5.
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