Organocuprate-induced coupling of propargyl or enyne alcohols using (methylphenylamino)tributylphosphonium iodide. Regiocontrolled synthesis of allenes and conjugated enynes
Arynes, generated in situ from ortho-silylaryl triflates, undergo ene reaction with alkynes possessing propargylic hydrogen in the presence of KF/18-crown-6 in THF at room temperature to give substituted phenylallenes. Various terminal and internal alkynes as well as different arynes can be used to give the corresponding phenylallenes in good to moderate yields. The reaction of alkyne without propargylic