Abstract
Various dialkyl- and diarylvinylsulfonium salts react with indole-2-carboxaldehydes in the presence of sodium hydride and sodium azide to form tricyclic azido alcohols analogous to 2. With pyrrole-2-carboxaldehyde, [2,3] sigmatropic and other rearrangements occur except in the case of diphenylvinylsulfonium trifluoromethanesulfonate where the annulation reaction does take place to give a low yield of 29.
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