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Communication | Special issue | Vol 18, No. 1, 1982, pp.21-28
Published online, 1st January, 1970
DOI: 10.3987/S(B)-1982-01-0021
Pyrazolo[1,5-c]pyrimidines from Pyrylium Salts and Amidrazones and Pyridine lmidoyl-N-imides from lmidoyl Chlorides

Alan R. Katritzky* and Alberto Tárraga Tomás

*Center for Heterocyclic Compounds, Department of Chemistry, University of Florida, P. O. Box 117200, Gainesville, FL 32611-7200, U.S.A.


2,4,6-Triphenylpyrylium salts react with unsubstituted amidrazones to give dihydropyrazolo[1,5-c]pyrimidines or salts of pyridine imidoyl-N-imides. Pyridine imidoyl-N-imides are conveniently prepared from N-aminopyridinium and imidoyl chlorides.