The thermally labile spiro-3H-pyrazoles obtained by the reaction of diazoindenothiophenes with dimethyl acetylenedicarboxylate rearranged into the corresponding 3H-pyrazoles which are formed via Van Alphen–Huttel rearrangement followed by the migration of an ester group.
通过重氮茚并二甲酸二甲酯反应获得的热不稳定螺-3H-吡唑重排成相应的 3H-吡唑,后者通过 Van Alphen-Huttel 重排和酯基迁移形成。
Mataka, Shuntaro; Ohshima, Takeshi; Tashiro, Masashi, Journal of Heterocyclic Chemistry, 1982, vol. 19, p. 65 - 68