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Synlett 2011(18): 2633-2642
DOI: 10.1055/s-0031-1289550
DOI: 10.1055/s-0031-1289550
ACCOUNT
© Georg Thieme Verlag
Stuttgart ˙ New York
Synthesis of Functionalized Heterocycles by Cyclization Reactions of Oxime and Hydrazone 1,4-Dianions
Further Information
Received
1 June 2011
Publication Date:
25 October 2011 (online)
Publication History
Publication Date:
25 October 2011 (online)
Abstract
Oxime and hydrazone 1,4-dianions can be generated in situ by deprotonation with 2 equivalents of n-butyllithium (n-BuLi) or lithium diisopropylamide (LDA). In this account, the development and synthetic applications of one-pot cyclizations of oxime and hydrazone dianions with various electrophiles are highlighted. These reactions provide an efficient synthesis of functionalized isoxazoles, pyrazoles and other heterocycles.
1 Introduction
2 Cyclization Reactions of Oxime 1,4-Dianions
3 Cyclization Reactions of Hydrazone 1,4-Dianions
4 Conclusion
Key words
cyclization - dianions - oximes - hydrazones - pyrazoles - isoxazoles
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