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■ Formation Pathway of Novel Cycloadduct Obtained by Reaction of 3,5-Disubstituted 4-Oxo-4H-pyrazole 1,2-Dioxide with Dimethyl Acetylenedicarboxylate

Yasuyuki Yoshitake, Koki Yamaguchi, and Kazunobu Harano*

*Laboratory of Molecular Design, Sojo University, 4-22-1, Ikeda, Kumamoto-shi, 860-0082, Japan

Abstract

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.