Abstract
Among numerous approaches for the synthesis of condensed heterocycles bearing a pyrazole nucleus, the intramolecular cyclization of a suitable ortho -substituted nitroaromatic and nitroheteroaromatic precursors is one of the most convenient routes. This review summarizes recent developments in the application of this approach for the synthesis of fused pyrazoles, their 1-oxides, and 1-hydroxy derivatives.
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