Novel Heterocycles: A Convenient Synthesis of the Pyrazolo [3,4-<i>d</i>]isoxazole Ring System
作者:Rodolfo Nesi、Donatella Giomi、Sandro Papaleo、Susanna Bracci、Paolo Dapporto
DOI:10.1055/s-1988-27737
日期:——
Treatment of the nitroisoxazole 3 with varying amounts of diazomethane afforded, besides compound 5, the pyrazolo[3,4-d]isoxazole derivatives 9 and 10, respectively. A possible mechanism for the formation of these products, involving the primary cycloadduct 4, is proposed.
用不同量的二氮甲烷处理硝基异噁唑化合物3,除了得到化合物5外,还得到吡唑并[3,4-d]异噁唑衍生物9和10。提出了一种可能的机制,涉及初级环加成物4的形成。