Lewis Acid-Catalysed Oxidative Cycloaddition of Thiophenes1
- 1 May 1996
- journal article
- letter
- Published by Georg Thieme Verlag KG in Synlett
- Vol. 1996 (05) , 461-464
- https://doi.org/10.1055/s-1996-5446
Abstract
Thiophenes 1 have been treated with m-CPBA under BF3⋅Et2O catalysis. The thiophene-S-monoxides intermediary produced have been reacted in situ with various dienophiles. It could be shown that Lewis acid catalysis enhances the yield of the oxidative cycloaddition of thiophenes considerably. Moreover a greater variety of dienophiles can be used in the corresponding uncatalysed reaction. Thiophene-S-monoxides have also been isolated and subjected to subsequent cycloaddition in a two-step procedure.Keywords
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