Synthesis of Functionalized Heterocycles by Cyclization Reactions of Oxime and Hydrazone 1,4-Dianions

[摘要]：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

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