Acyclic Stereocontrol in Radical Reactions: ρ‐Selectivity with Oxazolidinone Auxiliories

It's the addition of Lewis acids that does it! Reaction (a) proceeds with diastereoselectivities ≥ 100:1 if the radical transfer takes place in the presence of Lewis acids such as MgI2, MgBr2, or Sc(OTf)3. The influence of the substituents at position 4 of the oxazolidinone ring on the allylation was also studied.