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A four-component reaction including two equivalents of aldehyde, 1 H -indazol-6-amine and 1 H -pyrazol-5(4 H )-one proceeds smoothly to afford a series of spiro[pyrazole-4,8′-pyrazolo[3,4- f ]quinolin]-5(1 H )-ones in high yields under catalyst-free conditions.

heterocyclic communications

Synthesis of spiro[pyrazole-4,8′-pyrazolo [3,4- f ]quinolin]-5(1 H )-ones by the reaction of aldehydes with 1 H -indazol-6-amine and 1 H -pyrazol-5(4 H )-one