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SYNTHESIS OF FUSED PYRAZOLES VIA INTRAMOLECULAR CYCLIZATION OF APPROPRIATELY ortho-SUBSTITUTED NITROARENES AND NITROHETEROARENES

Grygoriy Ya. Remennikov
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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.


Keywords


2,1-benzisoxazoles; fused pyrazole 1-oxides; fused pyrazoles; 1-hydroxyindazoles; nitroarenes; nitrohetarenes; intramolecular cyclization

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