New tetracyclic heteroaromatic ring system 3H-benzo[b]pyrazolo[3, 4-h]-1, 6-naphthyridines

Article abstract of DOI:10.1515/HC.2002.8.1.47

Various derivatives of the tetracyclic ring system 3H-Benzo[b]pyrazolo[3,4-h]-1,6-naphthyridine were prepared from 4-anilino-1H-pyrazolo[3,4-b]pyridine-5-carboxylic acids by intramolecular cyclization employing phophoryl chloride. ¹H NMR spectra of the various derivatives were recorder.

Full text of DOI:10.1515/HC.2002.8.1.47

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