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Synlett 1999; 1999(9): 1453-1455
DOI: 10.1055/s-1999-2834
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New Synthesis of Differently Fused Pyridazinoquinolines

Vittorio Dal Piaz* , Maria Paola Giovannoni, Giovanna Ciciani, Claudia Vergelli
  • *Dipartimento di Scienze Farmaceutiche, Via G. Capponi, 9, 50121 Firenze (Italy); Fax + 39-55-24 07 76; E-mail: vdp@farmfi.scifarm.unifi.it
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Publication Date:
31 December 1999 (online)

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Treatment of properly 6-(substituted aryl)-5-acetyl-4-chloro- and 4-methylthio-3(2H)-pyridazinones with SnCl2/HCl afforded pyridazino[4,3-c] quinolinones 9 and 10, whereas the pyridazino[4,5-b] quinolinone derivative 6 was prepared by reduction of the 5-acetyl-4-anilino-6-phenyl-3(2H)-pyridazinone with sodium borohydride, followed by dehydration with polyphosphoric acid (PPA).

pyridazino[4,3-c]quinolinones - pyridazino[4,5-b]quinolinones