A well-defined N-heterocyclic carbene (NHC) palladium-catalyzed intramolecular cyclization reaction of aryl-substituted alkylidenecyclopropanes (ACP) to 1-aryl dihydronaphthalenes is described. The NHC salts were found to suppress β-hydride elimination from the homoallylpalladium intermediate, which may lead to unwanted alkene formation. A plausible mechanism for the cycloisomerization was proposed.
本研究描述了一种定义明确的 N-杂环碳烯(NHC)
钯催化的芳基取代亚烷基
环丙烷(ACP)到 1-芳基二氢
萘的分子内环化反应。研究发现,NHC 盐会抑制同质烯丙基
钯中间体中的δ-酸酐消除,这可能会导致不必要的烯烃形成。提出了环异构化的合理机制。