Synthesis and Cycloaromatization of a Cyclic Enyne−Allene Prodrug
摘要:
A simple and stable cyclic enediynone (4) has been synthesized using an intramolecular Nozaki-Hiyama-Kishi cyclization as the key step. Reaction with a thiolate nucleophile led to rapid cycloaromatization of 4. Trapping experiments using 1,4-cyclohexadiene support the intermediacy of an aromatic diradical in the cycloaromatization.