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DOI: 10.1055/s-2008-1078013
New Variation of the Aromatic ortho-Claisen Rearrangement: Synthesis of Fused Thiophenes and Pyrroles
Publication History
Publication Date:
31 July 2008 (online)
Abstract
The development of a new variation of the aromatic ortho-Claisen rearrangement of aryl propargyl sulfoxides and arylpropargylamine oxides involving tandem [2,3]- and [3,3]-sigmatropic rearrangements followed by ketolization/SN2′ displacement to give fused thiophenes and pyrroles, respectively, is described.
1 Introduction
2 The New Variant
3 Mechanism
4 Applications
4.1 Synthesis of Condensed Thiophenes
4.2 Synthesis of Bioactive Heterocycle-Annulated Thiophenes
4.3 Unusual Dehydrogenative Elimination
4.4 Aliphatic Counterpart of the Variant
5 Amine Oxide Counterpart of the Variant
6 Conclusion
Key words
ortho-Claisen rearrangement - sigmatropic rearrangement - regioselective synthesis - fused thiophenes - fused pyrroles
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References
Majumdar, K. C. unpublished results.