Fused heterocycles. Part 3. Synthesis and stereochemistry of benzopyrano- and benzothiapyrano-[4,3-c]pyrazoles

Gábor Tóth, Áron Szöllösy, Tamás Lóránd, Tibor Kónya, Dezsö Szabó, András Földesi, Albert Lévai

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Several tricyclic benzopyrano[4,3-c]pyrazole derivatives have been studied by 1H and 13C n.m.r. spectroscopy. They were prepared by treating 3-benzylidene-chromanones and -1-thiochromanones with semicarbazide or thiosemicarbazide: reactions which give only the cis 3-H,3a-H stereoisomers.

Original languageEnglish
Pages (from-to)319-323
Number of pages5
JournalJournal of the Chemical Society, Perkin Transactions 2
Issue number4
Publication statusPublished - Dec 1 1989


ASJC Scopus subject areas

  • Chemistry(all)

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