Ruthenium‐Catalyzed One‐Pot Synthesis of ( E )‐(2‐Arylvinyl)boronates through an Isomerization/Cross‐Metathesis Sequence from Allyl‐Substituted Aromatics

We described the efficient preparation of ( E )‐(2‐arylvinyl)boronates from allylbenzene derivatives on the basis of an isomerization/cross‐metathesis sequence catalyzed by a modified Hoveyda–Grubbs catalyst. The implementation of the experimental procedure was simple and compatible with a large variety of substrates. This methodology provides a new chemical transformation not described to date. Allyl‐substituted aromatics can thus be converted into diversely functionalized compounds, such as ( E )‐stilbene derivatives or ( E )‐vinyl azides, in only two steps.