Synthesis of 2-Substituted Cyclohexene Derivatives through Cross-Coupling Reactions via π-Allylmetal Intermediate Using N-Heterocyclic Carbenes (NHCs) as Ligands

摘要

Palladium- or nickel-catalyzed cross-coupling reactions of 2-substituted cyclohexenes, which are generally less reactive than those having no substituent at the C2 position, with organotin reagents (Migita-Kosugi-Stille coupling) or with Grigard reagents (Kumada-Tamao-Corriu coupling) using a NHC as a ligand was investigated. It was found that NHCs are effective as ligands for these reactions, giving the corresponding cross-coupling products in good yields.