Nitroazines. 20. Simple syntheses of nitropyrazolopyridines from aliphatic nitrosynthons and aminopyrazoles
V. L. Rusinov, A. Yu. Petrov and O. N. Chupakhin
Chemistry of Heterocyclic Compounds,Volume 28, Number 11 / November, 1992, Pages 1335-1339
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http://dx.doi.org/10.1007/BF00532089