Cover Feature: Gold‐Catalyzed Cycloisomerization of Sulfur Ylides to Dihydrobenzothiepines (Chem. Eur. J. 48/2020)

Many reactions of sulfonium ylides suffer from stoichiometric waste production through release of the sulfur moiety. An atom-economical synthesis of heterocycles has now been developed, which showcases a novel mode of sulfonium ylide reactivity. Treatment of S-homopropargyl sulfonium ylides with a gold catalyst under mild conditions results in an atom-economical, charge-accelerated sulfonium [3,3]-sigmatropic rearrangement, giving access to a variety of novel dihydrobenzo[b]thiepines without release of any sulfur by-product. More information can be found in the Communication by N. Maulide et al. on page 10972).