Yf. Wang et al., Reactivity and rearrangements of dialkyl- and diarylvinylsulfonium salts with indole-2-and pyrrole-2-carboxaldehydes, TETRAHEDRON, 55(35), 1999, pp. 10659-10672
Various dialkyl- and diarylvinylsulfonium salts react with indole-2-carboxa
ldehydes in the presence of sodium hydride and sodium azide to form tricycl
ic azido alcohols analogous to 2. With pyrrole-2-carboxaldehyde, [2,3] sigm
atropic and other rearrangements occur except in the case of diphenylvinyls
ulfonium trifluoromethanesulfonate where the annulation reaction does take
place to give a low yield of 29. (C) 1999 Elsevier Science Ltd. All rights
reserved.