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Synthesis 1988; 1988(11): 884-886
DOI: 10.1055/s-1988-27737
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Novel Heterocycles: A Convenient Synthesis of the Pyrazolo [3,4-d]isoxazole Ring System

Rodolfo Nesi* , Donatella Giomi, Sandro Papaleo, Susanna Bracci, Paolo Dapporto
  • *Dipartimento di Chimica Qrganica 'Ugo Schiff' - Centro di Studio del C.N.R. sulla chimica e la struttura dei composti eterociclici e loro applicazioni, Università di Firenze, Via Gino Capponi 9, I-50121 Firenze, Italy
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Publikationsdatum:
20. August 2002 (online)

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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.