Efficient Pd-Catalyzed Direct Coupling of Aryl Chlorides with Alkyllithium Reagents |
| |
Authors: | Dr. Thorsten Scherpf M. Sc. Henning Steinert M. Sc. Angela Großjohann Dr. Katharina Dilchert M. Sc. Jens Tappen M. Sc. Ilja Rodstein Prof. Dr. Viktoria H. Gessner |
| |
Affiliation: | Faculty of Chemistry and Biochemistry, Chair of Inorganic Chemistry, Ruhr-Universität Bochum, Universitätsstraße 150, 44801 Bochum, Germany |
| |
Abstract: | Organolithium compounds are amongst the most important organometallic reagents and frequently used in difficult metallation reactions. However, their direct use in the formation of C−C bonds is less established. Although remarkable advances in the coupling of aryllithium compounds have been achieved, Csp2−Csp3 coupling reactions are very limited. Herein, we report the first general protocol for the coupling or aryl chlorides with alkyllithium reagents. Palladium catalysts based on ylide-substituted phosphines (YPhos) were found to be excellently suited for this transformation giving high selectivities at room temperature with a variety of aryl chlorides without the need for an additional transmetallation reagent. This is demonstrated in gram-scale synthesis including building blocks for materials chemistry and pharmaceutical industry. Furthermore, the direct coupling of aryllithiums as well as Grignard reagents with aryl chlorides was also easily accomplished at room temperature. |
| |
Keywords: | catalysis cross-coupling reactions organolithium phosphine ligands ylides |
|
|