A New Route to 1,3-bis-Exocyclic Dienes Using a Palladium-mediatedCyclization/Coupling Reaction of Conjugated Enynes with Organic Halides and Triflates
The palladium catalyzed tandem cyclization/coupling reaction of conjugated enynes having a stabilizing carbon nucleophile with unsaturated halides or triflate afforded stereodefined functionalized 1,3-bis-exocyclic dienes. Moderate yields were obtained with substrates of type 1. However, higher homologs of type 2 led to the formation of functionalized 1,3-bis-exocyclic dienes and hexatrienes in good yields. An initial study on the sequential cyclization/coupling reaction/electrocyclization in a one-pot procedure leading to cyclohexadienes is also presented.
The efficient and practical syntheses of functionalized carbo-and heterocyclic compounds have been achieved employing a process based on an intramolecular palladium-mediated cyclization coupled with a carbon-carbon bond forming reaction.
通过采用基于分子内钯介导的环化反应与碳-碳键形成反应相结合的工艺,实现了功能化碳杂环化合物的高效、
New Method for the Synthesis of Functionalized 1,3-Bis-Exocyclic Dienes via a Palladium-Catalyzed Reaction. Scope and Synthetic Applications