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Synthesis 2000; 2000(1): 72-74
DOI: 10.1055/s-2000-6231
short paper
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A New Synthetic Approach to Pyrazolo[3,4-c]-1,2,5-oxadiazoles

Pier Giovanni Baraldi* , Maria J. Pineda de las Infantas, Stefano Manfredini, Romeo Romagnoli
  • *Dipartimento di Scienze Farmaceutiche, Via Fossato di Mortara 17/19, I-44100, Ferrara, Italy; Fax +39 (5 32) 29 12 96; E-mail: pgb@dns.unife.it
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Publication Date:
31 December 2000 (online)

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4-aryl-substituted-6-methyl-4H-pyrazolo[3,4-c]-1,2,5-oxadiazoles 15-21 were easily obtained through the oxidation reaction mediated by lead(IV) acetate of 5-methyl-4-nitroso-2-phenyl-2H-pyrazol-3-ylamines 8-14 in 88-97% yields.

lead(IV) acetate - 4-nitroso-5-aminopyrazoles - intramolecular cyclization - fluorescent dyes - purine receptor antagonists

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