FORMATION PATHWAY OF NOVEL CYCLOADDUCT OBTAINED BY REACTION OF 3,5-DISUBSTITUTED 4-OXO-4H-PYRAZOLE 1,2-DIOXIDE WITH DIMETHYL ACETYLENEDICARBOXYLATE

[摘要]：A new formation pathway via [3,3]-sigmatropic rearrangement of the 1,3-dipolar reaction product was proposed for the novel nitrogen-free compound formed from the reaction of 3,5-disubstituted 4-oxo-4H-pyrazole 1,2-dioxide with dimethyl acetylenedicarboxylate.

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