γ‑Halo-enones: A Method for their Synthesis from Arylacyl Halides and Their Application to the Preparation of Five-Membered Ring Heterocycles

A simple method has been developed
for synthesis of γ-halo-enones.
The approach employs a sequence involving initial indium-mediated
allenylation reactions of phenacyl halides with propargyl bromide.
This process is followed by acid-promoted rearrangement reactions
of the formed homoallenic halohydrins. The new method can be incorporated
into routes for the efficient synthesis of various five-membered heterocyclic
compounds.