Skeletal Rearrangement in the ZnII‐Catalyzed [4+2]‐Annulation of Disubstituted N‐Hydroxy Allenylamines with Nitrosoarenes to Yield Substituted 1,2‐Oxazinan‐3‐one Derivatives
This work reports zinc-catalyzed [4+2]-annulation reactions of disubstituted N-hydroxy allenylamines with nitrosoarenes to afford substituted 1,2-oxazinan-3-ones with a skeletal rearrangement. This annulation is applicable to a reasonable scope of allenylamines and nitrosoarenes. Our control experiments indicate that nitrosobenzene can also implement this annulation through a radical annulation path, but with poor efficiency. Zn(OTf)2 or AgOTf greatly improves the efficiency of this [4+2]-annulation; the effect of these metal species is discussed in detail.
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