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2005
C-C bond formation
O 0282
Dramatic Enhancement of Catalytic Activity in an Ionic Liquid: Highly Practical
Alkenylation of Arenes with Alkynes Catalyzed by Metal Tri11- 066 Friedel—Crafts
flates. — The application of hydrophobic ionic liquids as solvent significantly increases the catalytic activity of metal triflates in the Friedel—Crafts alkenylation of arenes
(I) and (IV) with alkynes (II). Good results are also obtained for the alkenylation of
electron-deficient alkynes like (Ic) and (Id). The method is successfully applied to
intramolecular alkenylation reactions as demonstrated in the cyclization of aryl
alkynoates (VII) as well as propiolic amide (IX). — (SONG*, C. E.; JUNG, D.-U.;
CHOUNG, S. Y.; ROH, E. J.; LEE, S.-G.; Angew. Chem., Int. Ed. 43 (2004) 45,
6183-6185; Dep. Chem., Sung Kyun Kwan Univ., Suwon 440-746, S. Korea; Eng.)
— Mischke
2005
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