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DOI: 10.1055/s-2007-965910
The Reaction of Huisgen Zwitterion with Diaryl-1,2-diones and Ketones: An Efficient Protocol for Carbon-Nitrogen Bond Formation
Publikationsverlauf
Publikationsdatum:
25. Januar 2007 (online)

Abstract
The reaction of Huisgen zwitterion, derived from triphenylphosphine and dialkyl azodicarboxylate, with diaryl-1,2-diones afforded N,N-dicarboalkoxy monohydrazones via a mechanistically novel rearrangement. Cyclic and acyclic ketones furnished vinyl hydrazinedicarboxylates under similar conditions.
Key words
betaines - diazo compounds - hydrazones - ketones - rearrangements
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The reaction of PPh3 and DEAD with dimethyl acetylenedicarboxylate affording pyrazoles is mentioned; rationalization of this reaction as occurring via the zwitterion 3 was provided by Huisgen (Ref. 3a).
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References
It may be mentioned that the mechanism presented herein is identical to that suggested by Liu and Lee (references 6 and 9, respectively).