Cooperative Iodide Pd(0)-Catalysed Coupling of Alkoxyallenes and N -Tosylhydrazones: A Selective Synthesis of Conjugated and Skipped Dienes

Palladium(0)‐catalysed hydro‐alkylation or ‐alkenylation of alkoxyallenes with N ‐tosylhydrazones gives direct access to conjugated and skipped 1‐alkoxydienes with high efficiency and excellent functional‐group compatibility. The reaction is proposed to involve the in situ‐formed t ‐butanol as proton source in the key step of the allylpalladium(II) species generation. Moreover, lithium iodide or iodobenzene are employed as an unprecedented...