Journal
EUROPEAN JOURNAL OF ORGANIC CHEMISTRY
Volume 2009, Issue 29, Pages 5020-5027Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/ejoc.200900697
Keywords
Alkynes; Carboxylic acids; Homogeneous catalysis; Microwave chemistry; Ruthenium; Vinyl esters
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Funding
- Fonds pour la Formation A la Recherche dans l'industrie et dans l'Agriculture (FRIA)
- Fonds National de la Recherche Scientifique (FNRS), Brussels [FRFC 2.4565.07 and 2.4645.07, FRFC 2.4645.07]
- Spanish Ministerio de Educacion y Ciencia (MEC) [CTQ2007-61058/BQU]
- Departament d'Universitats, Recerca i Societat de la Informacio de la Generalitat de Catalunya (DURSI)
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An efficient and highly selective synthesis of vinyl esters was developed that employed carboxylic acids and terminal alkynes as reagents, and novel tethered (eta(1):eta(6)-phosphanoarene)ruthenium complexes as catalyst precursors. With these catalyst systems, the reactions were somewhat slower than when using the best catalysts reported to date, but the selectivities were excellent with up to 98% of the Markovnikov isomer. In addition, with a turnover number (TON) of 5000, these catalysts greatly outperformed their competitors. Minute amounts of water had a beneficial impact on the reaction rates, while maintaining the same selectivities. Furthermore, microwave heating at 160 degrees C also considerably accelerated the reactions, albeit to the detriment of the selectivity. Finally, it should also be noted that formation of dimerization products of 1-alkynes was completely suppressed by using these tethered (eta(1):eta(6) -phosphanoarene) ruthenium catalytic systems. ((C) Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2009)
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